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http://hdl.handle.net/20.500.12386/24500
Titolo: | EPIC 211391664b: A 32 Earth-mass Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star | Autori: | Barragán, Oscar Grziwa, Sascha Gandolfi, Davide Fridlund, Malcolm Endl, Michael Deeg, Hans J. Cagigal, Manuel P. LANZA, Antonino Francesco Prada Moroni, Pier G. Smith, Alexis M. S. Korth, Judith Bedell, Megan Cabrera, Juan Cochran, William D. CUSANO, FELICE Csizmadia, Szilard Eigmüller, Philipp Erikson, Anders Guenther, Eike W. Hatzes, Artie P. Nespral, David Pätzold, Martin Prieto-Arranz, Jorge Rauer, Heike |
Data pubblicazione: | 2016 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 152 | Fascicolo: | 6 | Da pagina:: | 193 | Abstract: | We report the discovery of K2-98b (EPIC 211391664b), a transiting Neptune-size planet monitored by the K2 mission during its Campaign 5. We combine the K2 time-series data with ground-based photometric and spectroscopic follow-up observations to confirm the planetary nature of the object and derive its mass, radius, and orbital parameters. K2-98b is a warm Neptune-like planet in a 10 day orbit around a V = 12.2 mag F-type star with M_star = 1.074 ± 0.042 M_sun, R_star = 1.311 (-0.048, +0.083) R_sun, and age of 5.2 (-1.0, +1.2) Gyr. We derive a planetary mass and radius of M_planet = 32.2 ± 8.1 M_earth and R_planet = 4.3 (-0.2, +0.3) R_earth. K2-98b joins the relatively small group of Neptune-size planets whose mass and radius have been derived with a precision better than 25%. We estimate that the planet will be engulfed by its host star in ∼3 Gyr, due to the evolution of the latter toward the red giant branch. | URI: | http://hdl.handle.net/20.500.12386/24500 | URL: | https://iopscience.iop.org/article/10.3847/0004-6256/152/6/193 | ISSN: | 0004-6256 | DOI: | 10.3847/0004-6256/152/6/193 | Bibcode ADS: | 2016AJ....152..193B | Fulltext: | open |
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