K2-139 b

• Verfasst von: Barragán, Oscar [VerfasserIn]
• Verfasst von: Brems, Stefan S. [VerfasserIn]
• Titel: K2-139 b
• Titelzusatz: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star
• Verf.angabe: 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
• Jahr: 2018
• Jahr des Originals: 2017
• Umfang: 12 S.
• Fussnoten: Published: 13 December 2017 ; Gesehen am 05.03.2020
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2018
• Band/Heft Quelle: 475(2018), 2, Seite 1765-1776
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stx3207
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1691732796

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+0.083−0.075MJ 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.