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http://hdl.handle.net/20.500.12386/26613
Titolo: | EPIC 219388192b—An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster | Autori: | Nowak, Grzegorz Palle, Enric Gandolfi, Davide Dai, Fei LANZA, Antonino Francesco Hirano, Teruyuki Barragán, Oscar Fukui, Akihiko Bruntt, Hans Endl, Michael Cochran, William D. Prada Moroni, Pier G. Prieto-Arranz, Jorge Kiilerich, Amanda Nespral, David Hatzes, Artie P. Albrecht, Simon Deeg, Hans Winn, Joshua N. Yu, Liang Kuzuhara, Masayuki Grziwa, Sascha Smith, Alexis M. S. Guenther, Eike W. Van Eylen, Vincent Csizmadia, Szilard Fridlund, Malcolm Cabrera, Juan Eigmüller, Philipp Erikson, Anders Korth, Judith Narita, Norio Pätzold, Martin Rauer, Heike Ribas, Ignasi |
Data pubblicazione: | 2017 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 153 | Fascicolo: | 3 | Da pagina:: | 131 | Abstract: | We report the discovery of EPIC 219388192b, a transiting brown dwarf in a 5.3 day orbit around a member star of Ruprecht 147, the oldest nearby open cluster association, which was photometrically monitored by K2 during its Campaign 7. We combine the K2 time-series data with ground-based adaptive optics imaging and high-resolution spectroscopy to rule out false positive scenarios and determine the main parameters of the system. EPIC 219388192b has a radius of {R}<SUB>{{b</SUB>}}=0.937+/- 0.032 R <SUB>Jup</SUB> and mass of {M}<SUB>{{b</SUB>}}=36.84+/- 0.97 M <SUB>Jup</SUB>, yielding a mean density of 59.6+/- 7.6 {{g}} {{cm}}<SUP>-3</SUP>. The host star is nearly a solar twin with mass {M}<SUB>\star </SUB>=1.01+/- 0.04 M <SUB>☉</SUB>, radius {R}<SUB>\star </SUB>=1.01+/- 0.03 R <SUB>☉</SUB>, effective temperature T <SUB>eff</SUB> = 5850 ± 85 K, and iron abundance [Fe/H] = 0.03 ± 0.08 dex. Its age, spectroscopic distance, and reddening are consistent with those of Ruprecht 147, corroborating its cluster membership. EPIC 219388192b is the first mature brown dwarf with precise determinations of mass, radius, and age, and serves as benchmark for evolutionary models in the substellar regime. | URI: | http://hdl.handle.net/20.500.12386/26613 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/aa5cb6 | ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/aa5cb6 | Bibcode ADS: | 2017AJ....153..131N | Fulltext: | open |
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