GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star - Archive ouverte HAL Access content directly
Journal Articles Science Year : 2021

GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star

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Kristine W. F. Lam
  • Function : Author
Szilárd Csizmadia
  • Function : Author
Nicola Astudillo-Defru
  • Function : Author
Davide Gandolfi
  • Function : Author
Sebastiano Padovan
  • Function : Author
Massimiliano Esposito
  • Function : Author
Coel Hellier
  • Function : Author
Teruyuki Hirano
  • Function : Author
John Livingston
  • Function : Author
Felipe Murgas
  • Function : Author
Alexis M. S. Smith
  • Function : Author
Karen A. Collins
  • Function : Author
Savita Mathur
  • Function : Author
Rafael A. Garcia
  • Function : Author
Steve B. Howell
  • Function : Author
Nuno C. Santos
  • Function : Author
Fei Dai
  • 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
Simon Albrecht
  • Function : Author
Oscar Barragán
  • Function : Author
François Bouchy
  • Function : Author
David Charbonneau
  • Function : Author
Priyanka Chaturvedi
  • Function : Author
Alexander Chaushev
  • Function : Author
Jessie L. Christiansen
  • Function : Author
William D. Cochran
  • Function : Author
José R. de Meideiros
  • Function : Author
Rodrigo F. Díaz
  • Function : Author
René Doyon
  • Function : Author
Philipp Eigmüller
  • Function : Author
Pedro Figueira
  • Function : Author
Malcolm Fridlund
  • Function : Author
Elisa Goffo
  • Function : Author
Iskra Georgieva
  • Function : Author
Sascha Grziwa
  • Function : Author
Eike Guenther
  • Function : Author
Artie P. Hatzes
  • Function : Author
Marshall C. Johnson
  • Function : Author
Petr Kabáth
  • Function : Author
Emil Knudstrup
  • Function : Author
Judith Korth
  • Function : Author
Pablo Lewin
  • Function : Author
Jack J. Lissauer
  • Function : Author
Christophe Lovis
  • Function : Author
Rafael Luque
  • Function : Author
Claudio Melo
  • Function : Author
Edward H. Morgan
  • Function : Author
Robert Morris
  • Function : Author
Michel Mayor
  • Function : Author
Norio Narita
  • Function : Author
Hannah L. M. Osborne
  • Function : Author
Enric Palle
  • Function : Author
Francesco Pepe
  • Function : Author
Carina M. Persson
  • Function : Author
Samuel N. Quinn
  • Function : Author
Heike Rauer
  • Function : Author
Seth Redfield
  • Function : Author
Joshua E. Schlieder
  • Function : Author
Damien Ségransan
  • Function : Author
Luisa M. Serrano
  • Function : Author
Jeffrey C. Smith
  • Function : Author
Ján Šubjak
  • Function : Author
Joseph D. Twicken
  • Function : Author
Stéphane Udry
  • Function : Author
Vincent van Eylen
  • Function : Author
Michael Vezie
  • Function : Author

Abstract

Ultrashort-period (USP) exoplanets have orbital periods shorter than 1 day. Precise masses and radii of USP exoplanets could provide constraints on their unknown formation and evolution processes. We report the detection and characterization of the USP planet GJ 367b using high-precision photometry and radial velocity observations. GJ 367b orbits a bright (V-band magnitude of 10.2), nearby, and red (M-type) dwarf star every 7.7 hours. GJ 367b has a radius of 0.718 ± 0.054 Earth-radii and a mass of 0.546 ± 0.078 Earth-masses, making it a sub-Earth planet. The corresponding bulk density is 8.106 ± 2.165 grams per cubic centimeter—close to that of iron. An interior structure model predicts that the planet has an iron core radius fraction of 86 ± 5%, similar to that of Mercury’s interior.

Dates and versions

insu-03705254 , version 1 (27-06-2022)

Identifiers

Cite

Kristine W. F. Lam, Szilárd Csizmadia, Nicola Astudillo-Defru, Xavier Bonfils, Davide Gandolfi, et al.. GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star. Science, 2021, 374, pp.1271-1275. ⟨10.1126/science.aay3253⟩. ⟨insu-03705254⟩
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