Lam, KWF;
Csizmadia, S;
Astudillo-Defru, N;
Bonfils, X;
Gandolfi, D;
Padovan, S;
Esposito, M;
... Vezie, M; + view all
(2021)
GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star.
Science
, 374
(6572)
pp. 1271-1275.
10.1126/science.aay3253.
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2112.01309v1.pdf - Accepted Version Download (4MB) | Preview |
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.
| Type: | Article |
|---|---|
| Title: | GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/science.aay3253 |
| Publisher version: | https://doi.org/10.1126/science.aay3253 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10141172 |
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