The NEID Earth Twin Survey. I. Confirmation of a 31-day planet orbiting HD 86728
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| Formato: | Preprint |
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2024
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| author | Gupta, Arvind F. Luhn, Jacob K. Wright, Jason T. Mahadevan, Suvrath Robertson, Paul Krolikowski, Daniel M. Ford, Eric B. Cañas, Caleb I. Halverson, Samuel Lin, Andrea S. J. Kanodia, Shubham Fitzmaurice, Evan Gilbertson, Christian Bender, Chad F. Blake, Cullen H. Dong, Jiayin Giovinazzi, Mark R. Logsdon, Sarah E. Monson, Andrew Ninan, Joe P. Rajagopal, Jayadev Roy, Arpita Schwab, Christian Stefánsson, Guðmundur |
| author_facet | Gupta, Arvind F. Luhn, Jacob K. Wright, Jason T. Mahadevan, Suvrath Robertson, Paul Krolikowski, Daniel M. Ford, Eric B. Cañas, Caleb I. Halverson, Samuel Lin, Andrea S. J. Kanodia, Shubham Fitzmaurice, Evan Gilbertson, Christian Bender, Chad F. Blake, Cullen H. Dong, Jiayin Giovinazzi, Mark R. Logsdon, Sarah E. Monson, Andrew Ninan, Joe P. Rajagopal, Jayadev Roy, Arpita Schwab, Christian Stefánsson, Guðmundur |
| contents | With close to three years of observations in hand, the NEID Earth Twin Survey (NETS) is starting to unearth new astrophysical signals for a curated sample of bright, radial velocity (RV)-quiet stars. We present the discovery of the first NETS exoplanet, HD 86728 b, a $m_p\sin i = 9.16^{+0.55}_{-0.56}\ \rm{M}_\oplus$ planet on a circular, $P=31.1503^{+0.0062}_{-0.0066}$ d orbit, thereby confirming a candidate signal identified by Hirsch et al. (2021). We confirm the planetary origin of the detected signal, which has a semi-amplitude of just $K=1.91^{+0.11}_{-0.12}$ m s$^{-1}$, via careful analysis of the NEID RVs and spectral activity indicators, and we constrain the mass and orbit via fits to NEID and archival RV measurements. The host star is intrinsically quiet at the $\sim1$ m s$^{-1}$ level, with the majority of this variability likely stemming from short-timescale granulation. HD 86728 b is among the small fraction of exoplanets with similar masses and periods that have no known planetary siblings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_12315 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The NEID Earth Twin Survey. I. Confirmation of a 31-day planet orbiting HD 86728 Gupta, Arvind F. Luhn, Jacob K. Wright, Jason T. Mahadevan, Suvrath Robertson, Paul Krolikowski, Daniel M. Ford, Eric B. Cañas, Caleb I. Halverson, Samuel Lin, Andrea S. J. Kanodia, Shubham Fitzmaurice, Evan Gilbertson, Christian Bender, Chad F. Blake, Cullen H. Dong, Jiayin Giovinazzi, Mark R. Logsdon, Sarah E. Monson, Andrew Ninan, Joe P. Rajagopal, Jayadev Roy, Arpita Schwab, Christian Stefánsson, Guðmundur Earth and Planetary Astrophysics Solar and Stellar Astrophysics With close to three years of observations in hand, the NEID Earth Twin Survey (NETS) is starting to unearth new astrophysical signals for a curated sample of bright, radial velocity (RV)-quiet stars. We present the discovery of the first NETS exoplanet, HD 86728 b, a $m_p\sin i = 9.16^{+0.55}_{-0.56}\ \rm{M}_\oplus$ planet on a circular, $P=31.1503^{+0.0062}_{-0.0066}$ d orbit, thereby confirming a candidate signal identified by Hirsch et al. (2021). We confirm the planetary origin of the detected signal, which has a semi-amplitude of just $K=1.91^{+0.11}_{-0.12}$ m s$^{-1}$, via careful analysis of the NEID RVs and spectral activity indicators, and we constrain the mass and orbit via fits to NEID and archival RV measurements. The host star is intrinsically quiet at the $\sim1$ m s$^{-1}$ level, with the majority of this variability likely stemming from short-timescale granulation. HD 86728 b is among the small fraction of exoplanets with similar masses and periods that have no known planetary siblings. |
| title | The NEID Earth Twin Survey. I. Confirmation of a 31-day planet orbiting HD 86728 |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2409.12315 |