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K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star

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 observation...

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Bibliographische Detailangaben
Hauptverfasser: Barragán, Oscar (VerfasserIn) , Brems, Stefan S. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2018
In: Monthly notices of the Royal Astronomical Society
Year: 2017, Jahrgang: 475, Heft: 2, Pages: 1765-1776
ISSN:1365-2966
DOI:10.1093/mnras/stx3207
Online-Zugang:Verlag, Volltext: https://doi.org/10.1093/mnras/stx3207
Verlag: https://academic.oup.com/mnras/article/475/2/1765/4739349
Volltext
Verfasserangaben:O. Barragán, D. Gandolfi, A.M.S. Smith, H.J. Deeg, M.C.V. Fridlund, C.M. Persson, P. Donati, M. Endl, Sz Csizmadia, S. Grziwa, D. Nespral, A.P. Hatzes, W.D. Cochran, L. Fossati, S.S. Brems, J. Cabrera, F. Cusano, Ph Eigmüller, C. Eiroa, A. Erikson, E. Guenther, J. Korth, D. Lorenzo-Oliveira, L. Mancini, M. Pätzold, J. Prieto-Arranz, H. Rauer, I. Rebollido, J. Saario, O.V. Zakhozhay
Beschreibung
Zusammenfassung: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+0.083−0.075MJ and radius of 0.808+0.034−0.033RJ, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91+0.24−0.20 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.
Beschreibung:Published: 13 December 2017
Gesehen am 05.03.2020
Beschreibung:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stx3207

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