K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star
Date Issued
2018
Author(s)
Barragán, O.
•
Gandolfi, D.
•
Smith, A. M. S.
•
Deeg, H. J.
•
Fridlund, M. C. V.
•
Persson, C. M.
•
•
Endl, M.
•
Csizmadia, Sz
•
Grziwa, S.
•
Nespral, D.
•
Hatzes, A. P.
•
Cochran, W. D.
•
Fossati, L.
•
Brems, S. S.
•
Cabrera, J.
•
•
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.
Abstract
We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq = 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 }MJ and radius of 0.808 _{ - 0.033 } ^ {+ 0.034 }RJ, 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-3can be explained with a core of ∼50 M⊕. 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-1), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.
Volume
475
Issue
2
Start page
1765
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.475.1765B
Rights
open.access
File(s)![Thumbnail Image]()
![Thumbnail Image]()
Loading...
Name
stx3207.pdf
Description
PDF editoriale
Size
986.47 KB
Format
Adobe PDF
Checksum (MD5)
b749e6f39f132ea366e5c0ba40318e17
Loading...
Name
1702.00691.pdf
Size
745.97 KB
Format
Adobe PDF
Checksum (MD5)
8b3f9865e52bdfc247f7c37e86ddcef2