학술논문
TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star
Document Type
article
Author
Melissa J. Hobson; Andrés Jordán; E. M. Bryant; R. Brahm; D. Bayliss; J. D. Hartman; G. Á. Bakos; Th. Henning; Jose Manuel Almenara; Khalid Barkaoui; Zouhair Benkhaldoun; Xavier Bonfils; François Bouchy; David Charbonneau; Marion Cointepas; Karen A. Collins; Jason D. Eastman; Mourad Ghachoui; Michaël Gillon; Robert F. Goeke; Keith Horne; Jonathan M. Irwin; Emmanuel Jehin; Jon M. Jenkins; David W. Latham; Dan Moldovan; Felipe Murgas; Francisco J. Pozuelos; George R. Ricker; Richard P. Schwarz; S. Seager; Gregor Srdoc; Stephanie Striegel; Mathilde Timmermans; Andrew Vanderburg; Roland Vanderspek; Joshua N. Winn
Source
The Astrophysical Journal Letters, Vol 946, Iss 1, p L4 (2023)
Subject
Language
English
ISSN
2041-8213
2041-8205
2041-8205
Abstract
We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate from TESS photometry and confirmed with radial velocities from ESPRESSO and ground-based photometry from HATSouth, MEarth-South, TRAPPIST-South, LCOGT, and ExTrA. We find that the planet has a mass of 0.665 ± 0.025 M _J and a radius of 1.017 ± 0.044 R _J . It orbits close to its host star, with an orbital period of 2.5926 days but has an equilibrium temperature of ≈ 604 K, well below the expected threshold for radius inflation of hot Jupiters. The host star has a mass of 0.3939 ± 0.0030 M _☉ , a radius of 0.3697 ± 0.0018 R _☉ , an effective temperature of 3389 K, and a J -band magnitude of 11.706 ± 0.025. Current planet formation models do not predict the existence of gas giants such as TOI-3235 b around such low-mass stars. With a high transmission spectroscopy metric, TOI-3235 b is one of the best-suited giants orbiting M dwarfs for atmospheric characterization.