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GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star
Lam, Kristine
Csizmadia, Szilárd
Bonfils, Xavier
Gandolfi, Davide
Padovan, Sebastiano
Esposito, Massimiliano
Hellier, Coel
Hirano, Teruyuki
Livingston, John
Murgas, Felipe
Smith, Alexis
Collins, Karen
Mathur, Savita
Garcia, Rafael
Howell, Steve
Santos, Nuno
Dai, Fei
Ricker, George
Vanderspek, Roland
Latham, David
Seager, Sara
Winn, Joshua
Jenkins, Jon
Albrecht, Simon
Almenara, Jose
Artigau, Etienne
Barragán, Oscar
Bouchy, François
Cabrera, Juan
Charbonneau, David
Chaturvedi, Priyanka
Chaushev, Alexander
Christiansen, Jessie
Cochran, William
De Meideiros, José
Delfosse, Xavier
Díaz, Rodrigo
Doyon, René
Eigmüller, Philipp
Figueira, Pedro
Forveille, Thierry
Fridlund, Malcolm
Gaisné, Guillaume
Goffo, Elisa
Georgieva, Iskra
Grziwa, Sascha
Guenther, Eike
Hatzes, Artie
Johnson, Marshall
Kabáth, Petr
Knudstrup, Emil
Korth, Judith
Lewin, Pablo
Lissauer, Jack
Lovis, Christophe
Luque, Rafael
Melo, Claudio
Morgan, Edward
Morris, Robert
Mayor, Michel
Narita, Norio
Osborne, Hannah
Palle, Enric
Pepe, Francesco
Persson, Carina
Quinn, Samuel
Rauer, Heike
Redfield, Seth
Schlieder, Joshua
Ségransan, Damien
Serrano, Luisa
Smith, Jeffrey
Šubjak, Ján
Twicken, Joseph
Udry, Stéphane
Van Eylen, Vincent
Vezie, Michael
American Association for the Advancement of Science
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.