GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc

Author:

Tey EvanORCID,Shporer AviORCID,Lin ZifanORCID,Stassun Keivan G.ORCID,Lissauer Jack J.ORCID,Hellier CoelORCID,Collins Karen A.ORCID,Collins Kevin I.ORCID,Wingham Geof,Relles Howard M.,Mallia FrancoORCID,Isopi Giovanni,Kielkopf John F.ORCID,Conti Dennis M.ORCID,Schwarz Richard P.ORCID,Zapparata AldoORCID,Giacalone StevenORCID,Furlan EliseORCID,Hartman Zachary D.ORCID,Howell Steve B.ORCID,Scott Nicholas J.ORCID,Ziegler Carl,Briceño CésarORCID,Law NicholasORCID,Mann Andrew W.ORCID,Charbonneau DavidORCID,Essack ZahraORCID,Striegel StephanieORCID,Ricker George R.ORCID,Vanderspek RolandORCID,Seager SaraORCID,Winn Joshua N.ORCID,Jenkins Jon M.ORCID

Abstract

Abstract We report the discovery of the transiting planet GJ 238 b, with a radius of 0.566 ± 0.014 R (1.064 ± 0.026 times the radius of Mars) and an orbital period of 1.74 days. The transit signal was detected by the TESS mission and designated TOI-486.01. The star’s position close to the southern ecliptic pole allows for almost continuous observations by TESS when it is observing the southern sky. The host star is an M2.5 dwarf with V = 11.57 ± 0.02 mag, K = 7.030 ± 0.023 mag, a distance of 15.2156 ± 0.0030 pc, a mass of 0.4193 0.0098 + 0.0095 M , a radius of 0.4314 0.0071 + 0.0075 R , and an effective temperature of 3485 ± 140 K. We validate the planet candidate by ruling out or rendering highly unlikely each of the false positive scenarios, based on archival data and ground-based follow-up observations. Validation was facilitated by the host star’s small size and high proper motion of 892.633 ± 0.025 mas yr–1.

Publisher

American Astronomical Society

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