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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28009
Title: K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star
Authors: 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.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 475
Issue: 2
First Page: 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
Appears in Collections:1.01 Articoli in rivista

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