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http://hdl.handle.net/20.500.12386/28032
Titolo: | K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion | Autori: | Smith, A. M. S. Gandolfi, D. Barragán, O. Bowler, B. Csizmadia, Sz. Endl, M. Fridlund, M. C. V. Grziwa, S. Guenther, E. Hatzes, A. P. Nowak, G. Albrecht, S. Alonso, R. Cabrera, J. Cochran, W. D. Deeg, H. J. CUSANO, FELICE Eigmüller, Ph. Erikson, A. Hidalgo, D. Hirano, T. Johnson, M. C. Korth, J. Mann, A. Narita, N. Nespral, D. Palle, E. Pätzold, M. Prieto-Arranz, J. Rauer, H. Ribas, I. Tingley, B. Wolthoff, V. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 464 | Fascicolo: | 3 | Da pagina:: | 2708 | Abstract: | We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20 ± 0.05) subgiant, with mass 1.60^{+0.14}_{-0.10} M<SUB>☉</SUB> and radius 3.1 ± 0.1 R<SUB>☉</SUB>. The planet has a mass of 0.97 ± 0.09 M<SUB>Jup</SUB> and a radius 1.29 ± 0.05 R<SUB>Jup</SUB>. A measured systemic radial acceleration of -2.12 ± 0.04 ms<SUP>-1</SUP> d<SUP>-1</SUP> offers compelling evidence for the existence of a third body in the system, perhaps a brown dwarf orbiting with a period of several hundred days. | URI: | http://hdl.handle.net/20.500.12386/28032 | URL: | https://academic.oup.com/mnras/article/464/3/2708/2447921 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2487 | Bibcode ADS: | 2017MNRAS.464.2708S | Fulltext: | open |
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