Simulated high-resolution spectra of the program star wasp-121 (an F-type star) and a G-type comparison star with a similar magnitude. The spectral resolution is degraded to 47,000, consistent with the Flames spectrograph. — astro-ph.EP
Atmospheric characterization of exoplanets has traditionally relied on Low-Resolution Transmission Spectroscopy (LRTS), obtained from both space- and ground-based facilities, as well as on High-Resolution Transmission Spectroscopy (HRTS).
Although HRTS can resolve individual spectral lines, it is subject to normalization degeneracies that limit the accurate retrieval of key atmospheric parameters such as pressure, abundance, and cloud opacity. A promising strategy to mitigate this issue is to combine ground-based HRTS with space-based LRTS.
However, this approach depends on two separate datasets, thereby requiring two independent observations. In this study, we explore the feasibility of Multi-Object High-Resolution Transmission Spectroscopy (Mo-HRTS) as a means to constrain atmospheric parameters in retrievals using a single dataset.
Through simulations based on existing spectrograph specifications for a well-studied target, we demonstrate that low-resolution broadband transmission spectra can be extracted from Mo-HRTS data.
Manjunath Bestha, Athira Unni, T. Sivarani, Dhanush S R, Lokesh Manickavasaham, Parvathy M, Devika K Divakar, Arun Surya
Comments: Submitted to Springer Proceedings
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2509.18721 [astro-ph.EP] (or arXiv:2509.18721v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2509.18721
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Related DOI:
https://doi.org/10.1117/12.3064406
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Submission history
From: Manjunath Bestha
[v1] Tue, 23 Sep 2025 07:09:47 UTC (751 KB)
https://arxiv.org/abs/2509.18721
Astrobiology,
