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

Evan Tey; Avi Shporer; Zifan Lin; Keivan G. Stassun; Jack J. Lissauer; Coel Hellier; Karen A. Collins; Kevin I. Collins; Geof Wingham; Howard M. Relles; Franco Mallia; Giovanni Isopi; John F. Kielkopf; Dennis M. Conti; Richard P. Schwarz; Aldo Zapparata; Steven Giacalone; Elise Furlan; Zachary D. Hartman; Steve B. Howell; Nicholas J. Scott; Carl Ziegler; César Briceño; Nicholas Law; Andrew W. Mann; David Charbonneau; Zahra Essack; Stephanie Striegel; George R. Ricker; Roland Vanderspek; Sara Seager; Joshua N. Winn; Jon M. Jenkins

doi:10.3847/1538-3881/ad3df1

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

Evan Tey, Avi Shporer, Zifan Lin, Keivan G. Stassun, Jack J. Lissauer, Coel Hellier, Karen A. Collins, Kevin I. Collins, Geof Wingham, Howard M. Relles, Franco Mallia, Giovanni Isopi, John F. Kielkopf, Dennis M. Conti, Richard P. Schwarz, Aldo Zapparata, Steven Giacalone, Elise Furlan, Zachary D. Hartman, Steve B. HowellNicholas J. Scott, Carl Ziegler, César Briceño, Nicholas Law, Andrew W. Mann, David Charbonneau, Zahra Essack, Stephanie Striegel, George R. Ricker, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins

Astrophysical Sciences

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1 Scopus citations

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

Original language	English (US)
Article number	283
Journal	Astronomical Journal
Volume	167
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/ad3df1
State	Published - Jun 1 2024

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ad3df1

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Tey, E., Shporer, A., Lin, Z., Stassun, K. G., Lissauer, J. J., Hellier, C., Collins, K. A., Collins, K. I., Wingham, G., Relles, H. M., Mallia, F., Isopi, G., Kielkopf, J. F., Conti, D. M., Schwarz, R. P., Zapparata, A., Giacalone, S., Furlan, E., Hartman, Z. D., ... Jenkins, J. M. (2024). GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc. Astronomical Journal, 167(6), Article 283. https://doi.org/10.3847/1538-3881/ad3df1

@article{6d920980846f4cadb22f9ecf2f25cad4,

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

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{\textquoteright}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{\textquoteright}s small size and high proper motion of 892.633 ± 0.025",

author = "Evan Tey and Avi Shporer and Zifan Lin and Stassun, {Keivan G.} and Lissauer, {Jack J.} and Coel Hellier and Collins, {Karen A.} and Collins, {Kevin I.} and Geof Wingham and Relles, {Howard M.} and Franco Mallia and Giovanni Isopi and Kielkopf, {John F.} and Conti, {Dennis M.} and Schwarz, {Richard P.} and Aldo Zapparata and Steven Giacalone and Elise Furlan and Hartman, {Zachary D.} and Howell, {Steve B.} and Scott, {Nicholas J.} and Carl Ziegler and C{\'e}sar Brice{\~n}o and Nicholas Law and Mann, {Andrew W.} and David Charbonneau and Zahra Essack and Stephanie Striegel and Ricker, {George R.} and Roland Vanderspek and Sara Seager and Winn, {Joshua N.} and Jenkins, {Jon M.}",

note = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",

year = "2024",

month = jun,

day = "1",

doi = "10.3847/1538-3881/ad3df1",

language = "English (US)",

volume = "167",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "6",

}

Tey, E, Shporer, A, Lin, Z, Stassun, KG, Lissauer, JJ, Hellier, C, Collins, KA, Collins, KI, Wingham, G, Relles, HM, Mallia, F, Isopi, G, Kielkopf, JF, Conti, DM, Schwarz, RP, Zapparata, A, Giacalone, S, Furlan, E, Hartman, ZD, Howell, SB, Scott, NJ, Ziegler, C, Briceño, C, Law, N, Mann, AW, Charbonneau, D, Essack, Z, Striegel, S, Ricker, GR, Vanderspek, R, Seager, S, Winn, JN & Jenkins, JM 2024, 'GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc', Astronomical Journal, vol. 167, no. 6, 283. https://doi.org/10.3847/1538-3881/ad3df1

TY - JOUR

T1 - GJ 238 b

T2 - A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc

AU - Tey, Evan

AU - Shporer, Avi

AU - Lin, Zifan

AU - Stassun, Keivan G.

AU - Lissauer, Jack J.

AU - Hellier, Coel

AU - Collins, Karen A.

AU - Collins, Kevin I.

AU - Wingham, Geof

AU - Relles, Howard M.

AU - Mallia, Franco

AU - Isopi, Giovanni

AU - Kielkopf, John F.

AU - Conti, Dennis M.

AU - Schwarz, Richard P.

AU - Zapparata, Aldo

AU - Giacalone, Steven

AU - Furlan, Elise

AU - Hartman, Zachary D.

AU - Howell, Steve B.

AU - Scott, Nicholas J.

AU - Ziegler, Carl

AU - Briceño, César

AU - Law, Nicholas

AU - Mann, Andrew W.

AU - Charbonneau, David

AU - Essack, Zahra

AU - Striegel, Stephanie

AU - Ricker, George R.

AU - Vanderspek, Roland

AU - Seager, Sara

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

PY - 2024/6/1

Y1 - 2024/6/1

N2 - 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

AB - 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

UR - http://www.scopus.com/inward/record.url?scp=85194297708&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85194297708&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/ad3df1

DO - 10.3847/1538-3881/ad3df1

M3 - Article

AN - SCOPUS:85194297708

SN - 0004-6256

VL - 167

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

M1 - 283

ER -

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

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