Lam, Kristine W. F.; Csizmadia, Szilárd; Astudillo-Defru, Nicola; Bonfils, Xavier; Gandolfi, Davide; Padovan, Sebastiano; Esposito, Massimiliano; Hellier, Coel; Hirano, Teruyuki; Livingston, John; Murgas, Felipe; Smith, Alexis M. S.; Collins, Karen A.; Mathur, Savita; Garcia, Rafael A.; Howell, Steve B.; Santos, Nuno C.; Dai, Fei; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Albrecht, Simon; Almenara, Jose M.; Artigau, Etienne; Barragán, Oscar; Bouchy, François; Cabrera, Juan; Charbonneau, David; Chaturvedi, Priyanka; Chaushev, Alexander; Christiansen, Jessie L.; Cochran, William D.; De Meideiros, José R.; Delfosse, Xavier; Díaz, Rodrigo F.; Doyon, René; Eigmüller, Philipp; Figueira, Pedro; Forveille, Thierry; Fridlund, Malcolm; Gaisné, Guillaume; Goffo, Elisa; Georgieva, Iskra; Grziwa, Sascha; Guenther, Eike; Hatzes, Artie P.; Johnson, Marshall C.; Kabáth, Petr; Knudstrup, Emil; Korth, Judith; Lewin, Pablo; Lissauer, Jack J.; Lovis, Christophe; Luque, Rafael; Melo, Claudio; Morgan, Edward H.; Morris, Robert; Mayor, Michel; Narita, Norio; Osborne, Hannah L. M.; Palle, Enric; Pepe, Francesco; Persson, Carina M.; Quinn, Samuel N.; Rauer, Heike; Redfield, Seth; Schlieder, Joshua E.; Ségransan, Damien; Serrano, Luisa M.; Smith, Jeffrey C.; Šubjak, Ján; Twicken, Joseph D.; Udry, Stéphane; Van Eylen, Vincent; Vezie, Michael
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.
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable