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http://hdl.handle.net/20.500.12386/28009
Titolo: | K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star | Autori: | Barragán, O. Gandolfi, D. Smith, A. M. S. Deeg, H. J. Fridlund, M. C. V. Persson, C. M. Donati, P. Endl, M. Csizmadia, Sz Grziwa, S. Nespral, D. Hatzes, A. P. Cochran, W. D. Fossati, L. Brems, S. S. Cabrera, J. CUSANO, FELICE Eigmüller, Ph Eiroa, C. Erikson, A. Guenther, E. Korth, J. Lorenzo-Oliveira, D. Mancini, L. Pätzold, M. Prieto-Arranz, J. Rauer, H. Rebollido, I. Saario, J. Zakhozhay, O. V. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 475 | Fascicolo: | 2 | Da pagina:: | 1765 | Abstract: | We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (T<SUB>eq</SUB> = 547 ± 25 K) on a 29-d orbit around an active (log R^' _HK = -4.46 ± 0.06) K0 V star in K2 Campaign 7. We derive the system's parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387 _{ - 0.075 } ^ {+ 0.083 }M<SUB>J</SUB> and radius of 0.808 _{ - 0.033 } ^ {+ 0.034 }R<SUB>J</SUB>, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91 _{ - 0.20} ^ { + 0.24 } g cm<SUP>-3</SUP>can be explained with a core of ∼50 M<SUB>⊕</SUB>. Given the brightness of the host star (V = 11.653 mag), the relatively short transit duration (∼5 h), and the expected amplitude of the Rossiter-McLaughlin effect (∼25m s<SUP>-1</SUP>), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter. | URI: | http://hdl.handle.net/20.500.12386/28009 | URL: | https://academic.oup.com/mnras/article/475/2/1765/4739349 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx3207 | Bibcode ADS: | 2018MNRAS.475.1765B | Fulltext: | open |
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