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http://hdl.handle.net/20.500.12386/27893
Titolo: | The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131b | Autori: | Dai, Fei Winn, Joshua N. Gandolfi, Davide Wang, Sharon X. Teske, Johanna K. Burt, Jennifer Albrecht, Simon Barragán, Oscar Cochran, William D. Endl, Michael Fridlund, Malcolm Hatzes, Artie P. Hirano, Teruyuki Hirsch, Lea A. Johnson, Marshall C. Bo Justesen, Anders Livingston, John Persson, Carina M. Prieto-Arranz, Jorge Vanderburg, Andrew Alonso, Roi Antoniciello, Giuliano Arriagada, Pamela Butler, R. P. Cabrera, Juan Crane, Jeffrey D. CUSANO, FELICE Csizmadia, Szilárd Deeg, Hans Dieterich, Sergio B. Eigmüller, Philipp Erikson, Anders Everett, Mark E. Fukui, Akihiko Grziwa, Sascha Guenther, Eike W. Henry, Gregory W. Howell, Steve B. Johnson, John Asher Korth, Judith Kuzuhara, Masayuki Narita, Norio Nespral, David Nowak, Grzegorz Palle, Enric Pätzold, Martin Rauer, Heike Rodríguez, Pilar Montañés Shectman, Stephen A. Smith, Alexis M. S. Thompson, Ian B. Eylen, Vincent Van Williamson, Michael W. Wittenmyer, Robert A. |
Data pubblicazione: | 2017 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 154 | Fascicolo: | 6 | Da pagina:: | 226 | Abstract: | We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, K2-131b, was discovered in K2 Campaign 10. It has a radius of 1.81<SUB>-0.12</SUB><SUP>+0.16</SUP> R<SUB>\oplus</SUB> and orbits a G dwarf with a period of 8.9 hr. Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show evidence for stellar activity along with orbital motion. We determined the planetary mass using two different methods: (1) the "floating chunk offset" method, based only on changes in velocity observed on the same night; and (2) a Gaussian process regression based on both the radial velocity and photometric time series. The results are consistent and lead to a mass measurement of 6.5± 1.6 M<SUB>\oplus</SUB> and a mean density of 6.0<SUB>-2.7</SUB><SUP>+3.0</SUP> g cm<SUP>-3</SUP>. | URI: | http://hdl.handle.net/20.500.12386/27893 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/aa9065 | ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/aa9065 | Bibcode ADS: | 2017AJ....154..226D | Fulltext: | open |
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