The Astronomical Journal (Jan 2024)
The NEID Earth Twin Survey. I. Confirmation of a 31 Day Planet Orbiting HD 86728
- Arvind F. Gupta,
- Jacob K. Luhn,
- Jason T. Wright,
- Suvrath Mahadevan,
- Paul Robertson,
- Daniel M. Krolikowski,
- Eric B. Ford,
- Caleb I. Cañas,
- Samuel Halverson,
- Andrea S. J. Lin,
- Shubham Kanodia,
- Evan Fitzmaurice,
- Christian Gilbertson,
- Chad F. Bender,
- Cullen H. Blake,
- Jiayin Dong,
- Mark R. Giovinazzi,
- Sarah E. Logsdon,
- Andrew Monson,
- Joe P. Ninan,
- Jayadev Rajagopal,
- Arpita Roy,
- Christian Schwab,
- Guđmundur Stefánsson
Affiliations
- Arvind F. Gupta
- ORCiD
- U.S. National Science Foundation National Optical-Infrared Astronomy Research Laboratory , 950 N. Cherry Avenue, Tucson, AZ 85719, USA ; [email protected]
- Jacob K. Luhn
- ORCiD
- Department of Physics & Astronomy, The University of California , Irvine, Irvine, CA 92697, USA
- Jason T. Wright
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Penn State Extraterrestrial Intelligence Center, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA
- Suvrath Mahadevan
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA
- Paul Robertson
- ORCiD
- Department of Physics & Astronomy, The University of California , Irvine, Irvine, CA 92697, USA
- Daniel M. Krolikowski
- ORCiD
- Steward Observatory, The University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA
- Eric B. Ford
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Institute for Computational and Data Sciences, The Pennsylvania State University , University Park, PA 16802, USA; Center for Astrostatistics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
- Caleb I. Cañas
- ORCiD
- NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA
- Samuel Halverson
- ORCiD
- Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Pasadena, CA 91109, USA
- Andrea S. J. Lin
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA
- Shubham Kanodia
- ORCiD
- Earth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USA
- Evan Fitzmaurice
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Institute for Computational and Data Sciences, The Pennsylvania State University , University Park, PA 16802, USA
- Christian Gilbertson
- ORCiD
- Department of Astronomy & Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Exoplanets and Habitable Worlds, The Pennsylvania State University , 525 Davey Laboratory, 251 Pollock Road, University Park, PA 16802, USA; Center for Computing Research , Sandia National Laboratories, 1450 Innovation Pkwy SE, Albuquerque, NM 87123, USA
- Chad F. Bender
- ORCiD
- Steward Observatory, The University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA
- Cullen H. Blake
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , 209 S 33rd Street, Philadelphia, PA 19104, USA
- Jiayin Dong
- ORCiD
- Center for Computational Astrophysics, Flatiron Institute , 162 Fifth Avenue, New York, NY 10010, USA; Department of Astronomy, University of Illinois at Urbana-Champaign , Urbana, IL 61801, USA
- Mark R. Giovinazzi
- ORCiD
- Department of Physics and Astronomy, University of Pennsylvania , 209 S 33rd Street, Philadelphia, PA 19104, USA; Department of Physics & Astronomy, Amherst College , 25 East Drive, Amherst, MA 01002, USA
- Sarah E. Logsdon
- ORCiD
- U.S. National Science Foundation National Optical-Infrared Astronomy Research Laboratory , 950 N. Cherry Avenue, Tucson, AZ 85719, USA ; [email protected]
- Andrew Monson
- ORCiD
- Steward Observatory, The University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85721, USA
- Joe P. Ninan
- ORCiD
- Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
- Jayadev Rajagopal
- ORCiD
- U.S. National Science Foundation National Optical-Infrared Astronomy Research Laboratory , 950 N. Cherry Avenue, Tucson, AZ 85719, USA ; [email protected]
- Arpita Roy
- ORCiD
- Astrophysics & Space Institute , Schmidt Sciences, New York, NY 10011, USA
- Christian Schwab
- ORCiD
- School of Mathematical and Physical Sciences, macquarie University , Balaclava Road, North Ryde, NSW 2109, Australia
- Guđmundur Stefánsson
- ORCiD
- Anton Pannekoek Institute for Astronomy, 904 Science Park, University of Amsterdam , Amsterdam, 1098 XH, The Netherlands
- DOI
- https://doi.org/10.3847/1538-3881/ad89bf
- Journal volume & issue
-
Vol. 169,
no. 1
p. 1
Abstract
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 ${m}_{p}\sin i={9.16}_{-0.56}^{+0.55}\ {{M}}_{\oplus }$ 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.
Keywords
