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

TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136

Tianjun Gan
  • Function : Author
Abderahmane Soubkiou
  • Function : Author
Sharon X. Wang
  • Function : Author
Zouhair Benkhaldoun
  • Function : Author
Shude Mao
  • Function : Author
Étienne Artigau
  • Function : Author
Steven Giacalone
  • Function : Author
Christopher A. Theissen
  • Function : Author
Christian Aganze
  • Function : Author
Adam Burgasser
  • Function : Author
Karen A. Collins
  • Function : Author
Avi Shporer
  • Function : Author
Khalid Barkaoui
  • Function : Author
Mourad Ghachoui
  • Function : Author
Steve B. Howell
  • Function : Author
Claire Lamman
  • Function : Author
Olivier D. S. Demangeon
  • Function : Author
Artem Burdanov
  • Function : Author
Charles Cadieux
  • Function : Author
Jamila Chouqar
  • Function : Author
Kevin I. Collins
  • Function : Author
Neil J. Cook
  • Function : Author
Laetitia Delrez
  • Function : Author
Brice-Olivier Demory
  • Function : Author
René Doyon
  • Function : Author
Georgina Dransfield
  • Function : Author
Courtney D. Dressing
  • Function : Author
Elsa Ducrot
  • Function : Author
Jiahao Fan
  • Function : Author
Lionel Garcia
  • Function : Author
Holden Gill
  • Function : Author
Michaël Gillon
  • Function : Author
Crystal L. Gnilka
  • Function : Author
Yilen Gómez Maqueo Chew
  • Function : Author
Maximilian N. Günther
  • Function : Author
Christopher E. Henze
  • Function : Author
Chelsea X. Huang
  • Function : Author
Emmanuel Jehin
  • Function : Author
Eric L. N. Jensen
  • Function : Author
Zitao Lin
  • Function : Author
James Mccormac
  • Function : Author
Catriona A. Murray
  • Function : Author
Prajwal Niraula
  • Function : Author
Peter P. Pedersen
  • Function : Author
Francisco J. Pozuelos
  • Function : Author
Didier Queloz
  • Function : Author
Benjamin V. Rackham
  • Function : Author
Arjun B. Savel
  • Function : Author
Nicole Schanche
  • Function : Author
Richard P. Schwarz
  • Function : Author
Daniel Sebastian
  • Function : Author
Samantha Thompson
  • Function : Author
Mathilde Timmermans
  • Function : Author
Amaury H. M. J. Triaud
  • Function : Author
Michael Vezie
  • Function : Author
Robert D. Wells
  • Function : Author
Julien de Wit
  • Function : Author
George R. Ricker
  • Function : Author
Roland Vanderspek
  • Function : Author
David W. Latham
  • Function : Author
Sara Seager
  • Function : Author
Joshua N. Winn
  • Function : Author
Jon M. Jenkins
  • Function : Author

Abstract

We present the discovery of TOI-2136 b, a sub-Neptune planet transiting a nearby M4.5V-type star every 7.85 d, identified through photometric measurements from the Transiting Exoplanet Survey Satellite (TESS) mission. The host star is located 33 pc away with a radius of R* = 0.34 ± 0.02 R, a mass of $0.34\pm 0.02 \, \mathrm{M}_{\odot }$, and an effective temperature of 3342 ± 100 K. We estimate its stellar rotation period to be 75 ± 5 d based on archival long-term photometry. We confirm and characterize the planet based on a series of ground-based multiwavelength photometry, high-angular-resolution imaging observations, and precise radial velocities from Canada-France-Hawaii Telescope (CFHT)/SpectroPolarimètre InfraROUge (SPIRou). Our joint analysis reveals that the planet has a radius of 2.20 ± 0.17 R and a mass of 6.4 ± 2.4 M. The mass and radius of TOI-2136 b are consistent with a broad range of compositions, from water-ice to gas-dominated worlds. TOI-2136 b falls close to the radius valley for M dwarfs predicted by thermally driven atmospheric mass-loss models, making it an interesting target for future studies of its interior structure and atmospheric properties.
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Dates and versions

insu-03867454 , version 1 (06-07-2023)

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Tianjun Gan, Abderahmane Soubkiou, Sharon X. Wang, Zouhair Benkhaldoun, Shude Mao, et al.. TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136. Monthly Notices of the Royal Astronomical Society, 2022, 514, pp.4120-4139. ⟨10.1093/mnras/stac1448⟩. ⟨insu-03867454⟩
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