Time series of relative FWHM measurements for all NETS stars with multiple nights of data collected prior to August 2021. We observe a sharp decrease in FWHM in August 2021 for all Solar-type stars, and we interpret this as a break in the RV time series necessitating the definition of a new NEID RV era prior to this date. A sharp FWHM change is also observed for HD 95735, an M-dwarf, but this change does not follow that of the other stars, suggesting a chromatic dependence. Though the ∆FWHM time series for HD 170657 and HD 201091 stand out from the other Solartype stars, these variations reflect changing stellar activity levels rather than an instrumental effect. — astro-ph.EP
The NEID Earth Twin Survey (NETS) has been delivering a rich set of precise radial velocity (RV) measurements for 41 bright, nearby main sequence stars.
Here, we describe the status of the survey after three years on sky and we present the full set of RV measurements and accompanying stellar activity indicators. We discuss intermediate survey diagnostics, including calibration of the known RV zero point offset introduced following the Contreras fire in 2022 and the identification of an undiagnosed and previously unknown zero point offset in 2021.
An analysis of our data set using RVSearch demonstrates that for these target stars, NEID is independently sensitive to nearly all known planets with periods shorter than the NETS observing baseline. We also highlight a number of newly detected RV signals, which present exciting opportunities for future investigations.
Arvind F. Gupta, Evan Fitzmaurice, Suvrath Mahadevan, Paul Robertson, Jacob K. Luhn, Jason T. Wright, Sarah E. Logsdon, Daniel M. Krolikowski, Leonardo A. Paredes, Chad F. Bender, Mark R. Giovinazzi, Andrea S. Lin, Cullen H. Blake, Caleb I. Cañas, Eric B. Ford, Samuel P. Halverson, Shubham Kanodia, Michael W. McElwain, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Guðmundur Stefánsson, Ryan C. Terrien
Comments: Submitted to the Astronomical Journal. 27 Pages, 12 Figures (including 5 Figure sets which are included in the source files)
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2506.23704 [astro-ph.EP](or arXiv:2506.23704v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2506.23704
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Submission history
From: Arvind Gupta
[v1] Mon, 30 Jun 2025 10:27:04 UTC (14,846 KB)
https://arxiv.org/abs/2506.23704
Astrobiology,