We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq=547±25 K) on a 29-day 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 gcm−3 can 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 hours), and the expected amplitude of the Rossiter-McLaughlin effect (∼25ms−1 ), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.

Barragan, O., Gandolfi, D., Smith, A., Deeg, H.j., Fridlund, M., Persson, C.m., et al. (2018). K2-139 b: A low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 475(2), 1765-1776 [10.1093/mnras/stx3207].

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

Mancini L.;
2018-01-01

Abstract

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq=547±25 K) on a 29-day 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 gcm−3 can 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 hours), and the expected amplitude of the Rossiter-McLaughlin effect (∼25ms−1 ), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.
2018
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Barragan, O., Gandolfi, D., Smith, A., Deeg, H.j., Fridlund, M., Persson, C.m., et al. (2018). K2-139 b: A low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 475(2), 1765-1776 [10.1093/mnras/stx3207].
Barragan, O; Gandolfi, D; Smith, Ams; Deeg, Hj; Fridlund, Mcv; Persson, Cm; Donati, P; Endl, M; Csizmadia, S; Grziwa, S; Nespral, D; Hatzes, Ap; Cochr...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/204991
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