TY - JOUR
T1 - The NEID Earth Twin Survey. I. Confirmation of a 31 Day Planet Orbiting HD 86728
AU - Gupta, Arvind F.
AU - Luhn, Jacob K.
AU - Wright, Jason T.
AU - Mahadevan, Suvrath
AU - Robertson, Paul
AU - Krolikowski, Daniel M.
AU - Ford, Eric B.
AU - Cañas, Caleb I.
AU - Halverson, Samuel
AU - Lin, Andrea S.J.
AU - Kanodia, Shubham
AU - Fitzmaurice, Evan
AU - Gilbertson, Christian
AU - Bender, Chad F.
AU - Blake, Cullen H.
AU - Dong, Jiayin
AU - Giovinazzi, Mark R.
AU - Logsdon, Sarah E.
AU - Monson, Andrew
AU - Ninan, Joe P.
AU - Rajagopal, Jayadev
AU - Roy, Arpita
AU - Schwab, Christian
AU - Stefánsson, Guđmundur
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - With close to 3 yr 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 86728b, a m p sin i = 9.16 − 0.56 + 0.55 M ⊕ planet on a circular, P = 31.1503 − 0.0066 + 0.0062 day orbit, thereby confirming a candidate signal identified by L. A. Hirsch et al. We confirm the planetary origin of the detected signal, which has a semi-amplitude of just K = 1.91 − 0.12 + 0.11 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 ∼1 m s−1 level, with the majority of this variability likely stemming from short-timescale granulation. HD 86728b is among the small fraction of exoplanets with similar masses and periods that have no known planetary siblings.
AB - With close to 3 yr 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 86728b, a m p sin i = 9.16 − 0.56 + 0.55 M ⊕ planet on a circular, P = 31.1503 − 0.0066 + 0.0062 day orbit, thereby confirming a candidate signal identified by L. A. Hirsch et al. We confirm the planetary origin of the detected signal, which has a semi-amplitude of just K = 1.91 − 0.12 + 0.11 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 ∼1 m s−1 level, with the majority of this variability likely stemming from short-timescale granulation. HD 86728b is among the small fraction of exoplanets with similar masses and periods that have no known planetary siblings.
UR - https://www.scopus.com/pages/publications/85215839461
UR - https://www.scopus.com/pages/publications/85215839461#tab=citedBy
U2 - 10.3847/1538-3881/ad89bf
DO - 10.3847/1538-3881/ad89bf
M3 - Article
AN - SCOPUS:85215839461
SN - 0004-6256
VL - 169
JO - Astronomical Journal
JF - Astronomical Journal
IS - 1
M1 - 1
ER -