2024AJ....167..283T

Query : 2024AJ....167..283T

2024AJ....167..283T - Astron. J., 167, 283 (2024/June-0)

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

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., HOWELL S.B., SCOTT N.J., ZIEGLER C., BRICENO C., LAW N., MANN A.W., CHARBONNEAU D., ESSACK Z., STRIEGEL S., RICKER G.R., VANDERSPEK R., SEAGER S., WINN J.N. and JENKINS J.M.

Abstract (from CDS):

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.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Exoplanet detection methods - Transit photometry

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SEP reg 06 00 00.000 -66 33 38.55           ~ 198 0
2 DENIS J063349.7-583129 * 06 33 49.7961499881 -58 31 29.626436569         16.877 ~ 1 0
3 L 182-44 PM* 06 33 49.9711873177 -58 31 42.450688727 14.322 13.11 11.57 11.22 9.22 M2.5V 75 0
4 NAME L 182-44b Pl 06 33 49.9711873177 -58 31 42.450688727           ~ 6 0
5 Gaia DR3 5482827676660262272 * 06 33 50.7594773149 -58 31 40.386314492           ~ 1 0
6 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 682 1
7 CD-45 5378b Pl 09 44 29.8367689785 -45 46 35.427639685           ~ 86 0
8 CD-37 10765 PM* 16 20 03.5074325823 -37 31 44.407005397 13.314 12.145 10.586 9.495 8.116 M3V 95 0
9 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

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