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  • Pakistan plans naval, air collaboration in unmanned systems to boost indigenous capabilities

    Pakistan plans naval, air collaboration in unmanned systems to boost indigenous capabilities


    LAHORE: While conflict raged between the powerful militaries of India and Pakistan, a battle was also fought on the cultural front lines despite years of shared love for films and music.


    The deadly fighting in early May — the worst in decades — affected artists previously untouched by animosity between their leaders.


    Ali Gul Pir, a Pakistani rapper and comedian with a huge Indian following, released a song years ago mocking Indian Prime Minister Narendra Modi.


    While he was spared consequences then, in May, his YouTube channel and Instagram profile were blocked in India.


    “Indians now recognize that the digital space serves as a bridge between Pakistanis and Indians, and they seem intent on severing that connection,” Pir told AFP.



    In this photograph taken on June 17, 2025, a man looks at a film poster, Love Guru, featuring Pakistani actress Mahira Khan, outside a cineplex in Lahore. (AFP)


    The collapse in bilateral relations was caused by a deadly April attack on tourists in India-administered Kashmir, which New Delhi blamed on Islamabad.


    Pakistan denied the allegation and, after tit-for-tat diplomatic retaliation, their militaries fought for four days before a ceasefire was reached.


    The conflict hit the music industry for the first time, with Pakistani singer Annural Khalid also remembering how her Indian following dropped off.


    “Delhi was my top listening city before the ban,” said Khalid, who has 3.1 million monthly listeners on Spotify.


    “I suffered a great loss in the audience” from India, she told AFP.


    “Listeners were deprived of content because music was turned into something it is not,” Khalid added.



    In this photograph taken on May 29, 2025, Pakistan’s pop singer Annural Khalid sings inside her studio in Lahore. While conflict raged between the powerful militaries of India and Pakistan, a battle was also fought on the cultural front lines despite years of shared love for films and music. (AFP)


    The conflict also scrubbed out some prior exchanges, such as the soundtrack of the 2017 film “Raees” on Spotify in India.


    It now shows only Indian actor Shah Rukh Khan, without his Pakistani co-star Mahira Khan.


    With Pakistan producing just a handful of movies each year under strict censorship rules, Bollywood has always proven popular among viewers.


    “I grew up watching Bollywood. We have the same traumas, we have the same history, we have the same stories,” said Pakistani film critic Sajeer Shaikh.



    In this photograph taken on May 23, 2025, Sajeer Shaikh, a Pakistani film critic and content creator, speaks with AFP during an interview in Karachi. (AFP)


    Pakistani actors and directors have for decades seen making it to Bollywood as the ultimate recognition.



    Indian Bollywood film actresses Sonam Kapoor (C) and Kirron Kher (L), and Pakistani actor Fawad Afzal Khan (2L) watch the daily retreat ceremony performed by Pakistani Rangers and Indian Border Security Force (BSF) personnel at India-Pakistan Border Wagah Post on September 17, 2014. (AFP/File)


    But this month, Indian star Diljit Dosanjh announced his latest movie, “Sardaar Ji 3,” which features four Pakistani actors, would be released “overseas only,” after New Delhi banned Pakistani content and artists from productions.


    “Abir Gulaal,” a love story starring Pakistan’s Fawad Khan and Indian actor Vaani Kapoor, was scheduled to hit Indian cinemas on May 9 but the release was postponed.


    Even some in the industry who had previously backed the cross-border artistic trade changed their tune last month.


    “Everything should be banned… cricket, films, everything,” said Indian actor Suniel Shetty, who has a big fan following in Pakistan.



    In this photograph taken on June 17, 2025, a young boy walks past a film poster, Love Guru, featuring Pakistani actress Mahira Khan, inside a cineplex in Lahore. (AFP)


    He starred in the 2004 movie “Main Hoon Na,” which subtly promotes peace between India and Pakistan.


    “It’s something really unfortunate about politics, creating that rift and putting boundaries around art,” said Dua Zahra, assistant manager at Warner Bros South Asia’s music label in Pakistan.


    As part of its measures in the wake of the Kashmir attack, New Delhi’s ban on some Pakistani YouTube channels included private broadcaster HUM TV.


    The channel, which says around 40 percent of its viewers are from India, simply told its fans to use a VPN to continue watching.


    Since Modi took office more than a decade ago, many Indian critics and filmmakers have warned that Bollywood is now increasingly promoting his government’s Hindu nationalist ideology.


    While the conflict has created divisions on the cultural scene, there are signs that the trade will endure.


    Over a month after the ceasefire, three Indian films were in the top 10 on Netflix Pakistan, while the top 20 trending songs in India included two Pakistani tracks.

    Pir, the rapper and comedian, vowed to “bridge gaps.”


    “Let’s not make war, let’s just make art,” he said.


    “Let’s just not bomb each other.”

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  • Canada drops digital services tax to help restart US trade talks

    Canada drops digital services tax to help restart US trade talks

    Canada will rescind a tax on big US technology firms, just hours before first payments were due, to allow trade talks between the two countries to restart.

    On Friday, US President Donald Trump called off negotiations over a trade deal, describing the tax as a “blatant attack”, and threatened higher tariffs on imports from Canada.

    In response, Canada has said it will introduce legislation to remove the tax and would halt the collection of payments, which were due on Monday.

    White House economic adviser Kevin Hassett told Fox News on Monday that negotiations between the North American neighbours would “absolutely” restart as a result.

    The digital services tax (DST) would have meant US tech giants including Amazon, Meta, Google and Apple faced a 3% charge on Canadian revenue above $20m.

    Canada’s finance minister, François-Philippe Champagne, issued a statement saying the tax would be rescinded.

    “The DST was announced in 2020 to address the fact that many large technology companies operating in Canada may not otherwise pay tax on revenues generated from Canadians,” it said.

    “Canada’s preference has always been a multilateral agreement related to digital services taxation,” the statement added.

    Many countries, including the UK, are changing how they tax large multinational technology firms, which have millions of customers and advertisers around the world, but high corporation tax bills due to the way their businesses are structured.

    It was estimated that Canada’s tax would cost the tech giants more than C$2bn ($1.5bn; £1.06bn) in its first year as the tax was being applied retroactively to January 2022.

    Last year’s federal budget estimated the tax would bring in C$5.9bn in total over the next five years.

    Trump, who has forged a close relationship with tech company owners in his second term in office, has pushed back against such taxes.

    He described Canada’s policy as “egregious” adding “economically we have such power over Canada”.

    In a social media post on Monday, US Commerce Secretary Howard Lutnick thanked Canada for removing the tax, saying it would have “been a deal breaker for any trade deal with America”.

    Three quarters of Canada’s goods exports go to the US, worth more than $400bn a year, while Canada takes just 17% of US production.

    In a statement, the American Chamber of Commerce hailed the move to rescind the tax.

    “This is a constructive decision that allows both countries to focus on strengthening their economic partnership,” said chamber president Rick Tachuk.

    Canada’s climbdown comes after a rollercoaster few months for US-Canada relations.

    Shortly after taking office Trump threatened to impose sweeping new tariffs and even to annex the US’s northern neighbour.

    The antagonism helped propel Canada’s Liberal Party, led by former central banker, Mark Carney, back into power.

    Since then there appeared to be a rapprochement, with Canada and the US saying they aimed to agree new trade terms by 21 July.

    Canada’s digital services tax has been a long-time irritant for the US dating back to the previous Biden administration.

    Ottawa had received repeated warnings that it could undermine the trading relationship and lead to retaliation.

    But earlier this month, Champagne said Canada would move ahead with collecting the scheduled payments from big tech companies regardless of ongoing talks with the US.

    “It is hard to overstate how badly the government managed the DST issue over the past five years,” Michael Geist, a law professor at the University of Ottawa who has written extensively on the policy, wrote on his blog on Monday.

    He pointed to, among other factors, making the tax retroactive and downplaying bipartisan concerns from US lawmakers.

    There has been Canadian opposition to the tax as well, with business groups warning costs will be passed along to consumers.

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  • Oxylanthanum Carbonate Fails to Secure FDA Approval for Hyperphosphatemia, CKD

    Oxylanthanum Carbonate Fails to Secure FDA Approval for Hyperphosphatemia, CKD

    Oxylanthanum carbonate may improve treatment adherence.

    Image Credit: Nirusmee – stock.adobe.com

    Oxylanthanum carbonate (OLC) received a Complete Response Letter (CRL) from the FDA for the treatment of hyperphosphatemia in patients with chronic kidney disease (CKD) on dialysis, according to an announcement from Unicycive Therapeutics.1 OLC is a next-generation lanthanum-based phosphate binder that utilizes proprietary nanoparticle technology.

    “We plan to immediately seek a Type A meeting with the Agency to gain alignment on the best strategy to ensure rapid resolution of the CRL,” Shalabh Gupta, MD, chief executive officer of Unicycive, said in the statement.

    Hyperphosphatemia, or high phosphate levels in the blood, impacts nearly all patients with end-stage renal disease and is linked to higher mortality among those on dialysis.2 Untreated, it can lead to serious complications like cardiovascular disease. Despite available phosphate binders, about 75% of dialysis patients in the US do not meet recommended phosphorus levels.

    If approved in the future, OLC has the potential to advance treatment by reducing the pill burden that currently impacts adherence among this patient population, who often face a regimen that can involve up to 12 pills daily, according to Unicycive. In addition to reduced pill count per dose, OLC is designed to be easily swallowed rather than chewed.

    On June 10, Unicycive Therapeutics announced that the FDA had identified manufacturing deficiencies at a third-party subcontractor involved in producing OLC and that the agency had paused any label discussions related to the drug.3 At the time, Unicycive stated it was working with its partners to address the concerns; according to today’s statement,1 this citation was unrelated to OLC and no other technical concerns related to the submitted CMC documentation or testing of OLC itself were noted by the FDA in the application review.

    “With a second manufacturing vendor identified that has produced OLC drug product, we remain optimistic about our ability to bring this promising new treatment option to patients with CKD on dialysis who are managing hyperphosphatemia, and we plan to provide an update as soon as we have additional clarity on next steps from the FDA,” Gupta continued.

    Reduced Treatment Burden; Improved Adherence

    Patient-reported outcomes from the phase 2 UNI-OLC-201 study presented at the 2025 National Kidney Foundation Spring Clinical Meetings suggest that OLC may significantly improve treatment satisfaction, reduce pill burden, and enhance adherence among patients with CKD on dialysis.4 The open-label, single-arm, multicenter trial enrolled 86 dialysis patients with elevated serum phosphate levels to assess the impact of OLC on adherence and patient experience compared with their existing phosphate binder regimens.

    At baseline, patients reported a median daily intake of six phosphate binder tablets, with only 58% indicating adherence to their prescribed treatment. After a washout period and a 10-week regimen of OLC, which included dose titration followed by a maintenance phase, patients reported taking a median of just three OLC tablets per day. Notably, 70% of patients were adherent to OLC treatment, reflecting a meaningful improvement over pre-trial adherence rates.

    The results further showed that 79% of participants preferred OLC over their previous phosphate binder, and nearly all (98%) described OLC as easy to take, a stark contrast to the 38% who found their prior medication easy to use. Patient satisfaction with treatment also increased considerably, with 89% reporting satisfaction with OLC compared to 49% who were satisfied with their earlier phosphate binder.

    The NDA for OLC was submitted under the FDA’s 505(b)(2) pathway, leveraging data from 3 clinical studies and multiple preclinical evaluations.2 The product is protected by a broad global patent portfolio, with exclusivity extending through at least 2031 and possibly until 2035 with patent term extensions.

    Unicycive received a waiver for the PDUFA application fees, saving the company approximately $4 million as it prepares for potential commercialization of OLC in the second half of 2025. The global market for hyperphosphatemia treatments is estimated to exceed $2.5 billion, with the US market accounting for over $1 billion of that total.

    References

    1. Unicycive Therapeutics announces receipt of Complete Response Letter for oxylanthanum carbonate for the treatment of hyperphosphatemia in patients with chronic kidney disease on dialysis. News release. Unicycive Therapeutics. June 30, 2025. Accessed June 30, 2025. https://www.globenewswire.com/news-release/2025/06/30/3107365/0/en/Unicycive-Therapeutics-Announces-Receipt-of-Complete-Response-Letter-for-Oxylanthanum-Carbonate-for-the-Treatment-of-Hyperphosphatemia-in-Patients-with-Chronic-Kidney-Disease-on-Di.html

    2. Unicycive Therapeutics announces U.S. FDA acceptance of the New Drug Application (NDA) for oxylanthanum carbonate (OLC) for the treatment of hyperphosphatemia in patients with chronic kidney disease on dialysis. News release. Unicycive Therapeutics. November 11, 2024. Accessed June 24, 2025. https://www.globenewswire.com/en/news-release/2024/11/11/2978178/0/en/Unicycive-Therapeutics-Announces-U-S-FDA-Acceptance-of-the-New-Drug-Application-NDA-for-Oxylanthanum-Carbonate-OLC-for-the-Treatment-of-Hyperphosphatemia-in-Patients-with-Chronic-K.html

    3. Unicycive provides update on New Drug Application for oxylanthanum carbonate to treat hyperphosphatemia in patients with chronic kidney disease on dialysis. News release. Unicycive Therapeutics. June 10, 2025. Accessed June 24, 2025. https://www.globenewswire.com/news-release/2025/06/10/3096422/0/en/Unicycive-Provides-Update-on-New-Drug-Application-for-Oxylanthanum-Carbonate-to-Treat-Hyperphosphatemia-in-Patients-with-Chronic-Kidney-Disease-on-Dialysis.html

    4. Brooks A. Oxylanthanum carbonate may offer desirable alternative to current phosphate binders. HCPLive. April 10, 2025. Accessed June 24, 2025. https://www.hcplive.com/view/oxylanthanum-carbonate-may-offer-desirable-alternative-current-phosphate-binders

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  • Vittoria Ceretti Was the Best Dressed Guest at the Bezos-Sánchez Wedding

    Vittoria Ceretti Was the Best Dressed Guest at the Bezos-Sánchez Wedding

    This past weekend, the Jeff Bezos and Lauren Sánchez wedding festivities took over Venice, Italy. The multi-day affair included an impressive crew of celebrity guests, including Kim Kardashian, Kylie and Kendall Jenner, Sydney Sweeney, Oprah Winfrey, Leonardo DiCaprio and Vittoria Ceretti, and many more. While each star brought their best statement looks to the ceremony (and to the various pre- and after-parties), it was Ceretti who emerged as the best dressed attendee.

    Given the Italian model is no stranger to the high-fashion world (she is a regular on the runways and in various campaigns), it’s no surprise that Ceretti nailed Italian glamour throughout the week. It’s in her DNA! She kicked off the wedding celebrations on day one in an archival Dolce & Gabbana gown from 2004. The slinky silhouette had lacing along the sides, and was complete with a floral-trimmed shoulder detail; It felt just as fresh and modern in the present as it did when it initially debuted.

    Photo: Getty Images

    The next day, Ceretti was spotted doing some shopping in Venice on her down time in a perfect summer frock—a floral chiffon dress in red and white, paired with white ballet flats with ribbon-tied ankles. Around her shoulder, a chic Alaïa bag offered some structure.

    For the formal ceremony later in the evening, Ceretti went classic in a black gown with a plunging neckline. Around her neck, a striking diamond necklace took the spotlight. (Boyfriend Leonardo DiCaprio, meanwhile, wore a sleek black tuxedo, but evaded the paparazzi in a black cap.)

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  • More than 250,000 Afghans left Iran in June alone, UN says

    More than 250,000 Afghans left Iran in June alone, UN says

    Soroush Pakzad

    BBC Persian

    Getty Images Afghan refugees carrying their belongings arrive by bus at a border crossing between Afghanistan and IranGetty Images

    More than 256,000 Afghans left Iran in June alone, marking a surge in returns to Afghanistan since Tehran set a hard deadline for repatriations, the UN’s migration agency said.

    The International Organization for Migration (IOM) recorded as many as 28,000 Afghans leaving Iran in a single day in June, after the Iranian regime ordered all undocumented Afghans to leave the country by 6 July.

    The number of Afghan refugees in neighbouring Iran has swelled since the Taliban regained control of Afghanistan in 2021, many of whom live without legal status.

    This has contributed to growing anti-Afghan sentiment in Iran, with refugees facing systemic discrimination.

    The IOM said more than 700,000 Afghans had left Iran since January, with spokesperson Avand Azeez Agha telling news agency AFP that 70% had been “forcibly sent back”.

    The surge in repatriations – and the deadline – have come since Iran and Israel engaged in direct conflict with one another, beginning with Israel attacking nuclear and military sites in mid-June. A ceasefire has since been brokered.

    As the two exchanged daily strikes, the Iranian regime arrested several Afghan migrants it suspected of spying for Israel, state media reported.

    Following these claims, a new wave of deportations began. The semi-official Iranian Mehr news agency reported that police had been directed to accelerate deportations, though the police later denied this.

    “We’re scared to go anywhere because there’s always the fear they might accuse us of being spies,” one Afghan migrant in Iran, who we are not naming to protect their identity, told BBC Persian.

    “At the checkpoints, they do body searches and check people’s phones. If they find any messages or videos from foreign media on social networks, it could literally put someone’s life in danger.

    “Many Iranians insult us, saying things like: ‘you Afghans are spies’ or ‘you work for Israel’.”

    Numerous reports in Iranian media indicate that even Afghans with valid visas and documentation have been forcibly deported. Some Afghans who were detained and later freed said they were accused by officials of betraying the country.

    Arafat Jamal, the UN’s refugee co-ordinator for Afghanistan, said that while there was now a ceasefire between Israel and Iran, “the consequences of that war continue”.

    “This movement pre-dates the war, but it has been exacerbated by it,” he told BBC Pashto.

    “And what we hear from the returnees is a series of actions that have caused them to come back, some of them quite coercive, others not as much.”

    Arafat Jamal, who has a light beard and wears clear glasses, sits in front of an UNHCR flag.

    Arafat Jamal said UN humanitarian provisions at the Afghan border had been “overwhelmed”

    Afghan refugees are not eligible for Iranian citizenship, even if they are born in the country, while many are unable to open bank accounts, buy SIM cards or live in certain areas. Employment opportunities are also heavily restricted, and are often limited to hard labour with low wages.

    In this latest push to remove them, Iranian authorities have also urged the public to report undocumented Afghans.

    “There are oppressors here, and there are oppressors there,” a second Afghan in Iran said. “We migrants have never been free, never lived a free life.”

    Another said “the future for Afghans living in Iran looks really bleak”, adding: “The police are violent and humiliating, and now even the Basij [volunteer militia] have been tasked with arresting Afghans.”

    The surge in repatriations comes after Pakistan accelerated its own drive to expel undocumented Afghans, saying it could no longer manage hosting them.

    Mr Jamal said the number of refugees returning to Afghanistan from both Iran and Pakistan this year was in excess of one million.

    While he thanked both nations for taking in millions of Afghans over the past few decades of instability, he urged them to seek a joint solution to the crisis.

    The UN director said humanitarian provisions at the border had been “overwhelmed”, adding: “There is simply too many people coming back.”

    Maulvi Abdul Salam Hanafi, deputy prime minister in the Taliban government, said on Saturday that talks with Iranian officials were under way over the issue.

    The Taliban’s transport minister also said it was accelerating efforts to transport refugees from the border to their homes.

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  • A 3D Model Simulation Of Hydrogen Chloride Photochemistry On Mars: Comparison With Satellite Data

    A 3D Model Simulation Of Hydrogen Chloride Photochemistry On Mars: Comparison With Satellite Data

    HCl was detected in the Martian atmosphere by the NOMAD and ACS spectrometers aboard the ExoMars TGO. Photochemical models show that using gas-phase chemistry alone is insufficient to reproduce these data.

    Recent work has developed a heterogeneous chemical network within a 1D photochemistry model, guided by the seasonal variability in HCl. The aim of this work is to show that incorporating heterogeneous chlorine chemistry into a global 3D model of Martian photochemistry with conventional gas-phase chemistry can reproduce spatial and temporal changes in hydrogen chloride on Mars. We incorporated this heterogeneous chlorine scheme into the MPCM to model chlorine photochemistry during MYs 34 and 35.

    These two years provide contrasting dust scenarios, with MY 34 featuring a global dust storm. We also examined correlations in the model results between HCl and other key atmospheric quantities, as well as production and loss processes, to understand the impact of different factors driving changes in HCl.

    We find that this 3D model of Martian is consistent with the changes in HCl observed by ACS in MY 34 and MY 35, including detections and 70% of non-detections. For the remaining 30%, model HCl is higher than the ACS detection limit due to biases associated with water vapour, dust, or water ice content at these locations.

    As with previous 1D model calculations, we find that heterogeneous chemistry is required to describe the loss of HCl, resulting in a lifetime of a few sols that is consistent with the observed seasonal variation in HCl.

    As a result of this proposed chemistry, modelled HCl is correlated with water vapour, airborne dust, and temperature, and anticorrelated with water ice. Our work shows that this chemical scheme enables the reproduction of aphelion detections in MY 35.

    Benjamin Benne (1,2), Paul I. Palmer (1,2), Benjamin M. Taysum (3), Kevin S. Olsen (4,5), Franck Lefèvre (6) ((1) The University of Edinburgh, School of GeoSciences, UK, (2) Centre for Exoplanet Science, University of Edinburgh, UK, (3) DLR, Germany, (4) Department of Physics, University of Oxford, UK, (5) School of Physical Sciences, The Open University, UK, (6) LATMOS, France)

    Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Chemical Physics (physics.chem-ph)
    Cite as: arXiv:2506.18757 [astro-ph.EP] (or arXiv:2506.18757v1 [astro-ph.EP] for this version)
    https://doi.org/10.48550/arXiv.2506.18757
    Focus to learn more
    Related DOI:
    https://doi.org/10.1051/0004-6361/202553872
    Focus to learn more
    Submission history
    From: Benjamin Benne
    [v1] Mon, 23 Jun 2025 15:28:45 UTC (2,899 KB)
    https://arxiv.org/abs/2506.18757
    Astrobiology

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  • Tensions rise in Karachi as govt employees clash with police

    Tensions rise in Karachi as govt employees clash with police



    Pakistan


    Salaries and pensions protest turns violent; over 20 arrested as demonstrators march toward Red Zone





    KARACHI (Dunya News) – A protest by the Sindh Employees Grand Alliance demanding salary and pension increases escalated into a violent clash with police on Monday as demonstrators attempted to march toward Karachi’s Red Zone following failed negotiations with the provincial government.

    The standoff began outside the Karachi Press Club, where government employees rallied in large numbers. As protesters moved toward the restricted Red Zone, police used batons, tear gas, and water cannons to disperse them. In response, angry protesters reportedly pelted stones at law enforcement, further intensifying the chaos.

    Chanting slogans against the provincial authorities, protesters broke through barricades and staged a sit-in near the Red Zone, prompting another round of tear gas shelling. This affected bystanders, several of whom experienced breathing issues. A female police officer also collapsed and was shifted to a hospital for treatment.

    To contain the movement, police erected roadblocks on major arteries including I.I. Chundrigar Road, resulting in severe traffic congestion across surrounding areas. Earlier, access routes to the Press Club were sealed off, disrupting the movement of journalists and commuters alike.

    In a crackdown that followed, over 20 protesters were detained and transferred to local police stations.

    DIG South stated that blocking roads will not be tolerated and that law and order must prevail.

     

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  • Radio Galaxy Zoo: EMU – Paving The Way For EMU Cataloging Using AI And Citizen Science

    Radio Galaxy Zoo: EMU – Paving The Way For EMU Cataloging Using AI And Citizen Science

    RGZ EMU user interface and its 3-step workflow setup. The first 2 steps (in blue color) of
    the workflow is compulsary, while the third (in green color) is optional. — astro-ph.IM

    The Evolutionary Map of the Universe (EMU) survey with ASKAP is transforming our understanding of radio galaxies, AGN duty cycles, and cosmic structure.

    EMUCAT efficiently identifies compact radio sources, yet struggles with extended objects, requiring alternative approaches.

    The Radio Galaxy Zoo: EMU (RGZ EMU) project proposes a general framework that combines citizen science and machine learning to identify around 4 million extended sources in EMU.

    This framework is expected to enhance the EMUCAT cataloging on extended sources and can be further empowered with the introduction of cross-matched external data from surveys such as POSSUM and WALLABY.

    A schematic diagram showing the proposed RGZ EMU cataloging framework using citizen science and machine learning. The blue box (top left panel) shows sample images that are excluded from the final selection, as having either a low complexity or a source major axis smaller than 20 arcsec. Sample images in the red box, on the contrary, refers to sample images fulfilled our selection criteria. Gradient blue arrows refers to operation done within the framework, and gradient green arrows indicates the framework components that will contribute to the EMUCAT supplementary catalogs. — astro-ph.IM

    Hongming Tang, Eleni Vardoulaki, RGZ EMU collaboration

    Comments: 6 pages, 2 figures, The 2nd edition of the International Conference on Machine Learning for Astrophysics (ML4ASTRO2), conference paper accepted
    Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
    Cite as: arXiv:2506.16138 [astro-ph.IM] (or arXiv:2506.16138v1 [astro-ph.IM] for this version)
    https://doi.org/10.48550/arXiv.2506.16138
    Focus to learn more
    Submission history
    From: Hongming Tang
    [v1] Thu, 19 Jun 2025 08:44:47 UTC (7,722 KB)
    https://arxiv.org/abs/2506.16138
    Astrobiology,

    Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

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  • Neeraj Chopra seeks Sachin Tendulkar-like composure to face sporting challenges

    Neeraj Chopra seeks Sachin Tendulkar-like composure to face sporting challenges

    Javelin throw world champion Neeraj Chopra may possess his own sporting superpowers but given a chance, he would borrow one from cricketing legend Sachin Tendulkar.

    The 27-year-old Neeraj Chopra, who won gold at Tokyo 2020 and silver at Paris 2024, expressed his admiration for the legendary Indian batter’s ‘calm mindset’ when it came to dealing with challenges.

    “He represented our country so well for so many years and made so many records for us,” Neeraj told Star Sports, when asked which cricketer’s superpower he would like to borrow.

    “The way he faced challenges from many great bowlers and still performed exceptionally. I would want that superpower and try to do the same. It would help me handle challenges that come my way with a calm mindset.”

    Neeraj, who joined the elite 90m club earlier this year after a personal best 90.23m throw at the Doha Diamond League, was speaking ahead of the NC Classic – a World Athletics Continental Tour Gold event – which will be held in Bengaluru.

    The two-time Olympic medallist also drew an interesting parallel between his discipline and cricket, finding common ground between the javelin throw and MS Dhoni’s trademark batting shot.

    “I feel MS Dhoni’s helicopter shot is quite similar to a javelin throw in terms of power and technique,” Chopra noted.

    Asked which cricketers he believes could make good javelin throwers, Neeraj said former Australian fast bowler Brett Lee would be a natural choice.

    “I have heard that Brett Lee was a javelin thrower. I think he could throw the javelin well, especially when he was in his peak years,” he said.

    Neeraj also expressed his desire to learn a few tricks of the trade from Indian pace spearhead Jasprit Bumrah.

    “I would like to try javelin with Jasprit Bumrah too and hope he teaches me some bowling skills. While bowling and javelin are both throws, they are very different. I would like to learn from Bumrah.”

    Neeraj Chopra will next be seen in action at the NC Classic 2025 in Bengaluru on July 5. The Indian star clinched victories at the Ostrava Golden Spike and Paris Diamond League events earlier this season.

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  • Gravity-sensitive Spectral Indices In Ultracool Dwarfs: Investigating Correlations With Metallicity And Planet Occurrence Using SpeX and FIRE Observations

    Gravity-sensitive Spectral Indices In Ultracool Dwarfs: Investigating Correlations With Metallicity And Planet Occurrence Using SpeX and FIRE Observations

    EWs for the K i lines in the J band vs. NIR spectral type for M dwarfs in our sample. The figure elements are the same as in Figure 3. The panels display: (a) NIR spectral type vs. K i 1.169 µm EW, (b) NIR spectral type vs. K i 1.177 µm EW, and (c) NIR spectral type vs. K i 1.253 µm EW. — astro-ph.EP

    We present a near-infrared spectroscopic analysis (0.9-2.4 micron) of gravity indices for 57 ultracool dwarfs (spectral types M5.5 to L0), including exoplanet hosts TRAPPIST-1, SPECULOOS-2, SPECULOOS-3, and LHS 3154. Our dataset includes 61 spectra from the SpeX and FIRE spectrographs.

    Using gravity-sensitive indices such as FeH absorption (at 0.99, 1.20, and 1.55 microns), the VO band at 1.06 microns, the H-band continuum, and alkali lines like K I (at 1.17 and 1.25 microns), we investigate correlations between surface gravity, stellar metallicity, and the presence of close-in transiting planets.

    All four planet-hosting stars show intermediate-gravity spectral signatures despite indicators of field age. However, a volume-corrected logistic regression reveals no significant association between gravity class and planet occurrence. Among individual indices, FeH_z is the most promising tracer of planet-hosting status.

    We tentatively identify a correlation between FeH_z (0.99 micron) and planet presence at the 2-sigma level, though this may reflect observational biases including transit probability, small-number statistics, and detection sensitivity. More robustly, we find a significant anti-correlation between FeH_z and metallicity ([Fe/H]) at 3.3 sigma. A Kruskal-Wallis test shows no significant metallicity difference across gravity classes, suggesting the observed FeH_z-metallicity trend is not driven by bulk metallicity differences.

    We propose this anti-correlation reflects interplay between age, gravity, and composition: higher-metallicity objects may be systematically younger with lower gravities, suppressing FeH absorption. While our results only hint at a link between gravity-related characteristics and planet occurrence among late-M dwarfs, they underscore the need for caution when using spectral diagnostics to infer properties of planet-hosting ultracool dwarfs.

    Fatemeh Davoudi, Benjamin V. Rackham, Julien de Wit, Jan Toomlaid, Michaël Gillon, Amaury H. M. J. Triaud, Adam J. Burgasser, Christopher A. Theissen

    Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
    Cite as: arXiv:2506.19928 [astro-ph.EP] (or arXiv:2506.19928v1 [astro-ph.EP] for this version)
    https://doi.org/10.48550/arXiv.2506.19928
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    Submission history
    From: Fatemeh Davoudi
    [v1] Tue, 24 Jun 2025 18:05:48 UTC (2,086 KB)
    https://arxiv.org/abs/2506.19928
    Astrobiology

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