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

Lam, Kristine W.F. ; Csizmadia, Szilárd ; Astudillo-Defru, Nicola ; Bonfils, Xavier ; Gandolfi, Davide ; Padovan, Sebastiano ; Esposito, Massimiliano ; Hellier, Coel ; Hirano, Teruyuki and Livingston, John , et al. (2021) In Science 374(6572). p.1271-1275
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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
in
Science
volume
374
issue
6572
pages
5 pages
publisher
American Association for the Advancement of Science (AAAS)
external identifiers
  • pmid:34855492
  • scopus:85120699396
ISSN
0036-8075
DOI
10.1126/science.aay3253
language
English
LU publication?
no
additional info
Publisher Copyright: © 2021 American Association for the Advancement of Science. All rights reserved.
id
14e75234-40bd-47a2-88f8-5ff7c0aed817
date added to LUP
2023-02-01 09:54:57
date last changed
2024-04-17 09:36:58
@article{14e75234-40bd-47a2-88f8-5ff7c0aed817,
  abstract     = {{<p>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.</p>}},
  author       = {{Lam, Kristine W.F. and Csizmadia, Szilárd and Astudillo-Defru, Nicola and Bonfils, Xavier and Gandolfi, Davide and Padovan, Sebastiano and Esposito, Massimiliano and Hellier, Coel and Hirano, Teruyuki and Livingston, John and Murgas, Felipe and Smith, Alexis M.S. and Collins, Karen A. and Mathur, Savita and Garcia, Rafael A. and Howell, Steve B. and Santos, Nuno C. and Dai, Fei and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Albrecht, Simon and Almenara, Jose M. and Artigau, Etienne and Barragán, Oscar and Bouchy, François and Cabrera, Juan and Charbonneau, David and Chaturvedi, Priyanka and Chaushev, Alexander and Christiansen, Jessie L. and Cochran, William D. and de Meideiros, José R. and Delfosse, Xavier and Díaz, Rodrigo F. and Doyon, René and Eigmüller, Philipp and Figueira, Pedro and Forveille, Thierry and Fridlund, Malcolm and Gaisné, Guillaume and Goffo, Elisa and Georgieva, Iskra and Grziwa, Sascha and Guenther, Eike and Hatzes, Artie P. and Johnson, Marshall C. and Kabáth, Petr and Knudstrup, Emil and Korth, Judith and Lewin, Pablo and Lissauer, Jack J. and Lovis, Christophe and Luque, Rafael and Melo, Claudio and Morgan, Edward H. and Morris, Robert and Mayor, Michel and Narita, Norio and Osborne, Hannah L.M. and Palle, Enric and Pepe, Francesco and Persson, Carina M. and Quinn, Samuel N. and Rauer, Heike and Redfield, Seth and Schlieder, Joshua E. and Ségransan, Damien and Serrano, Luisa M. and Smith, Jeffrey C. and Šubjak, Ján and Twicken, Joseph D. and Udry, Stéphane and van Eylen, Vincent and Vezie, Michael}},
  issn         = {{0036-8075}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{6572}},
  pages        = {{1271--1275}},
  publisher    = {{American Association for the Advancement of Science (AAAS)}},
  series       = {{Science}},
  title        = {{GJ 367b : A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star}},
  url          = {{http://dx.doi.org/10.1126/science.aay3253}},
  doi          = {{10.1126/science.aay3253}},
  volume       = {{374}},
  year         = {{2021}},
}