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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

TOI-530b: a giant planet transiting an M-dwarf detected by TESS

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Tianjun Gan
Zitao Lin
  • Function : Author
Sharon Xuesong Wang
Shude Mao
  • Function : Author
Jiahao Fan
  • Function : Author
Megan Bedell
  • Function : Author
Keivan G. Stassun
  • Function : Author
Steven Giacalone
  • Function : Author
Akihiko Fukui
Felipe Murgas
  • Function : Author
David R. Ciardi
  • Function : Author
Steve B. Howell
  • Function : Author
Karen A. Collins
  • Function : Author
Avi Shporer
Luc Arnold
Thomas Barclay
David Charbonneau
Jessie Christiansen
  • Function : Author
Ian J. M. Crossfield
  • Function : Author
Courtney D. Dressing
  • Function : Author
Ashley Elliott
  • Function : Author
Emma Esparza-Borges
  • Function : Author
Phil Evans
Crystal L. Gnilka
  • Function : Author
Erica J. Gonzales
  • Function : Author
Andrew W. Howard
  • Function : Author
Keisuke Isogai
  • Function : Author
Kiyoe Kawauchi
  • Function : Author
Seiya Kurita
  • Function : Author
Beibei Liu
  • Function : Author
John H. Livingston
  • Function : Author
Rachel A. Matson
  • Function : Author
Norio Narita
  • Function : Author
Enric Palle
  • Function : Author
Hannu Parviainen
  • Function : Author
Benjamin V. Rackham
  • Function : Author
David R. Rodriguez
  • Function : Author
Mark Rose
Alexander Rudat
  • Function : Author
Joshua E. Schlieder
  • Function : Author
Nicholas J. Scott
  • Function : Author
Michael Vezie
  • Function : Author
George R. Ricker
  • Function : Author
Roland Vanderspek
David W. Latham
  • Function : Author
Sara Seager
Joshua N. Winn
  • Function : Author
Jon M. Jenkins
  • Function : Author

Abstract

We report the discovery of TOI-530b, a transiting Saturn-like planet around an M0.5V dwarf, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located at a distance of 147.7 ± 0.6 pc with a radius of R* = 0.54 ± 0.03 R and a mass of M* = 0.53 ± 0.02 M. We verify the planetary nature of the transit signals by combining ground-based multiwavelength photometry, high-resolution spectroscopy from SPIRou as well as high-angular-resolution imaging. With V = 15.4 mag, TOI-530b is orbiting one of the faintest stars accessible by ground-based spectroscopy. Our model reveals that TOI-530b has a radius of 0.83 ± 0.05 RJ and a mass of 0.37 ± 0.08 MJ on a 6.39-d orbit. TOI-530b is the sixth transiting giant planet hosted by an M-type star, which is predicted to be infrequent according to core accretion theory, making it a valuable object to further study the formation and migration history of similar planets. Furthermore, we identify a potential dearth of hot massive giant planets around M-dwarfs with separation distance smaller than 0.1 au and planet-to-star mass ratio between 2 × 10-3 and 10-2. We also find a possible correlation between hot giant planet formation and the metallicity of its parent M-dwarf. We discuss the potential formation channel of such systems.

Dates and versions

insu-03672039 , version 1 (19-05-2022)

Identifiers

Cite

Tianjun Gan, Zitao Lin, Sharon Xuesong Wang, Shude Mao, Pascal Fouqué, et al.. TOI-530b: a giant planet transiting an M-dwarf detected by TESS. Monthly Notices of the Royal Astronomical Society, 2022, 511, pp.83-99. ⟨10.1093/mnras/stab3708⟩. ⟨insu-03672039⟩
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