학술논문
GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pc
Document Type
Report
Author
Avi Shporer; Karen A. Collins; Nicola Astudillo-Defru; Jonathan Irwin; Xavier Bonfils; Kevin I. Collins; Elisabeth Matthews; Jennifer G. Winters; David R. Anderson; James D. Armstrong; David Charbonneau; Ryan Cloutier; Tansu Daylan; Tianjun Gan; Maximilian N. Günther; Coel Hellier; Keith Horne; Chelsea X. Huang; Eric L. N. Jensen; John Kielkopf; Enric Palle; Ramotholo Sefako; Keivan G. Stassun; Thiam-Guan Tan; Andrew Vanderburg; George R. Ricker; David W. Latham; Roland Vanderspek; Sara Seager; Joshua N. Winn; Jon M Jenkins; Knicole Colon; Courtney Dressing; Sébastien Léepine; Philip S. Muirhead; Mark E. Rose; Joseph D Twicken; Jesus Noel Villasenor
Source
The Astrophysical Journal. 890(1)
Subject
Language
English
ISSN
1538-4357
0004-637X
0004-637X
Abstract
We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 R⊕ and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 M⊕, 0.391 ± 0.020 R⊕) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TESS) data, ground-based photometry and spectroscopy, Gaia astrometry, and high angular resolution imaging to show that the transit signal seen in the TESS data must originate from a transiting planet. We do so by ruling out all false-positive scenarios that attempt to explain the transit signal as originating from an eclipsing stellar binary. Precise Doppler monitoring also leads to a tentative mass measurement of 2.09 ± 0.56 M⊕. The host star proximity, brightness (V = 12.19 mag, K = 7.92 mag), low stellar activity, and the system's short orbital period make this planet an attractive target for detailed characterization, including precise mass measurement, looking for other objects in the system, and planet atmosphere characterization.