K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
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,...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2016, Volume: 464, Issue: 3, Pages: 2708-2716 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stw2487 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stw2487
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| Author Notes: | A.M.S. Smith, D. Gandolfi, O. Barragán, B. Bowler, Sz. Csizmadia, M. Endl, M.C.V. Fridlund, S. Grziwa, E. Guenther, A.P. Hatzes, G. Nowak, S. Albrecht, R. Alonso, J. Cabrera, W.D. Cochran, H.J. Deeg, F. Cusano, Ph Eigmüller, A. Erikson, D. Hidalgo, T. Hirano, M.C. Johnson, J. Korth, A. Mann, N. Narita, D. Nespral, E. Palle, M. Pätzold, J. Prieto-Arranz, H. Rauer, I. Ribas, B. Tingley, V. Wolthoff |
| Summary: | 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⊙ and radius 3.1 ± 0.1 R⊙. The planet has a mass of 0.97 ± 0.09 MJup and a radius 1.29 ± 0.05 RJup. A measured systemic radial acceleration of −2.12 ± 0.04 ms−1 d−1 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. |
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| Item Description: | Published: 30 September 2016 Gesehen am 12.10.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stw2487 |