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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.

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

Gandolfi, Davide;Barragán, Oscar;Goffo, Elisa;Serrano, Luisa M;
2021-01-01

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.
2021
Inglese
WOS:000728578700061
34855492
2-s2.0-85120699396
Esperti anonimi
SCIENCE
374
6572
1271
1275
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https://www.science.org/doi/10.1126/science.aay3253
Press release UNITO: https://www.unito.it/comunicati_stampa/ricercatori-scoprono-gj-367-b-il-pianeta-piuma-con-una-massa-pari-alla-meta-di
sì
   GANDOLFI D. - Fondaz.CRT - II tornata 2018 - Rif. 2018.2323 - "Gaseous or rocky? Unveiling the nature of small worlds"
   FONDAZIONE CRT
   Rif. 2018.2323
4 – prodotto già presente in altro archivio Open Access (arXiv, REPEC…)
262
78
Lam, Kristine W F; Csizmadia, Szilárd; Astudillo-Defru, Nicola; Bonfils, Xavier; Gandolfi, Davide; Padovan, Sebastiano; Esposito, Massimiliano; Hellie...espandi
info:eu-repo/semantics/article
open
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1948760
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