GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star
Journal article, 2021
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.
Author
K. W.F. Lam
German Aerospace Center (DLR)
Technische Universität Berlin
Szilárd Csizmadia
German Aerospace Center (DLR)
N. Astudillo-Defru
Universidad Catolica de la Santisima Concepcion
X. Bonfils
Grenoble Alpes University
D. Gandolfi
University of Turin
Sebastiano Padovan
German Aerospace Center (DLR)
European Organisation for the Exploitation of Meteorological Satellites
M. Esposito
Thüringer Landessternwarte Tautenburg
Coel Hellier
Keele University
T. Hirano
National Institutes of Natural Sciences
Tokyo Institute of Technology
J.H. Livingston
University of Tokyo
F. Murgas
University of La Laguna
Instituto de Astrofísica de Canarias
Alexis M. S. Smith
German Aerospace Center (DLR)
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
S. Mathur
University of La Laguna
Instituto de Astrofísica de Canarias
R. A. García
The French Alternative Energies and Atomic Energy Commission (CEA)
University Paris-Saclay
S.B. Howell
NASA Ames Research Center
N. C. Santos
University of Porto
Fei Dai
California Institute of Technology (Caltech)
George R. Ricker
Massachusetts Institute of Technology (MIT)
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
S. Seager
Massachusetts Institute of Technology (MIT)
J. N. Winn
Princeton University
Jon M. Jenkins
NASA Ames Research Center
Simon Albrecht
Aarhus University
J. M. Almenara
Grenoble Alpes University
E. Artigau
Grenoble Alpes University
O. Barragán
University of Oxford
F. Bouchy
University of Geneva
J. Cabrera
Grenoble Alpes University
D. Charbonneau
Harvard-Smithsonian Center for Astrophysics
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
Alexander Chaushev
Technische Universität Berlin
Jessie L. Christiansen
California Institute of Technology (Caltech)
William D. Cochran
The University of Texas at Austin
José R. de Meideiros
Federal University of Rio Grande do Norte
X. Delfosse
Grenoble Alpes University
R. F. Diaz
Escuela de Economía y Negocios
René Doyon
Université de Montréal
P. Eigmüller
German Aerospace Center (DLR)
P. Figueira
European Southern Observatory Santiago
University of Porto
T. Forveille
Grenoble Alpes University
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
G. Gaisné
Grenoble Alpes University
E. Goffo
Thüringer Landessternwarte Tautenburg
University of Turin
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Grziwa
University of Cologne
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
M.C. Johnson
Las Cumbres Observatory Global Telescope Network
Petr Kabath
Academy of Sciences of the Czech Republic v.v.i
E. Knudstrup
Aarhus University
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
University of Cologne
Pablo Lewin
Maury Lewin Astronomical Observatory
Jack J. Lissauer
NASA Ames Research Center
Stanford University
C. Lovis
University of Geneva
R. Luque
University of La Laguna
Instituto de Astrofísica de Canarias
C. Melo
European Southern Observatory Santiago
Edward H. Morgan
Massachusetts Institute of Technology (MIT)
Robert Morris
NASA Ames Research Center
Search for Extraterrestrial Intelligence Institute
Michel Mayor
University of Geneva
Norio Narita
Astrobiology Center, Japan
University of Tokyo
Japan Science and Technology Agency
Instituto de Astrofísica de Canarias
H. L.M. Osborne
University College London (UCL)
Enric Palle
Instituto de Astrofísica de Canarias
University of La Laguna
Francesco Pepe
University of Geneva
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Samuel N. Quinn
Harvard-Smithsonian Center for Astrophysics
H. Rauer
Technische Universität Berlin
Freie Universität Berlin
German Aerospace Center (DLR)
S. Redfield
Wesleyan University
Joshua E. Schlieder
NASA Goddard Space Flight Center
D. Segransan
University of Geneva
L. M. Serrano
University of Turin
Jeffrey C. Smith
Search for Extraterrestrial Intelligence Institute
NASA Ames Research Center
J. Šubjak
Czech Academy of Sciences
Charles University
J. D. Twicken
Search for Extraterrestrial Intelligence Institute
NASA Ames Research Center
S. Udry
University of Geneva
Vincent Van Eylen
University College London (UCL)
Michael L. Vezie
Massachusetts Institute of Technology (MIT)
Science
0036-8075 (ISSN) 1095-9203 (eISSN)
Vol. 374 6572 1271-1275Subject Categories
Subatomic Physics
Astronomy, Astrophysics and Cosmology
Other Earth and Related Environmental Sciences
DOI
10.1126/science.aay3253
PubMed
34855492