Bibcode
Van Eylen, V.; Dai, F.; Mathur, S.; Gandolfi, D.; Albrecht, S.; Fridlund, M.; García, R. A.; Guenther, E.; Hjorth, M.; Justesen, A. B.; Livingston, J.; Lund, M. N.; Pérez Hernández, F.; Prieto-Arranz, J.; Regulo, C.; Bugnet, L.; Everett, M. E.; Hirano, T.; Nespral, D.; Nowak, G.; Palle, E.; Silva Aguirre, V.; Trifonov, T.; Winn, J. N.; Barragán, O.; Beck, P. G.; Chaplin, W. J.; Cochran, W. D.; Csizmadia, S.; Deeg, H.; Endl, M.; Heeren, P.; Grziwa, S.; Hatzes, A. P.; Hidalgo, D.; Korth, J.; Mathis, S.; Montañes Rodriguez, P.; Narita, N.; Patzold, M.; Persson, C. M.; Rodler, F.; Smith, A. M. S.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 4, p.4866-4880
Advertised on:
8
2018
Citations
31
Refereed citations
30
Description
We report the discovery and characterization of HD 89345b (K2-234b; EPIC
248777106b), a Saturn-sized planet orbiting a slightly evolved star. HD
89345 is a bright star (V = 9.3 mag) observed by the K2 mission with 1
min time sampling. It exhibits solar-like oscillations. We conducted
asteroseismology to determine the parameters of the star, finding the
mass and radius to be 1.12^{+0.04}_{-0.01} M_⊙ and
1.657^{+0.020}_{-0.004} R_⊙, respectively. The star appears to have
recently left the main sequence, based on the inferred age,
9.4^{+0.4}_{-1.3} Gyr, and the non-detection of mixed modes. The star
hosts a `warm Saturn' (P = 11.8 d, Rp = 6.86 ± 0.14
R⊕). Radial-velocity follow-up observations performed
with the FIbre-fed Echelle Spectrograph, HARPS, and HARPS-N
spectrographs show that the planet has a mass of 35.7 ± 3.3
M⊕. The data also show that the planet's orbit is
eccentric (e ≈ 0.2). An investigation of the rotational splitting of
the oscillation frequencies of the star yields no conclusive evidence on
the stellar inclination angle. We further obtained Rossiter-McLaughlin
observations, which result in a broad posterior of the stellar
obliquity. The planet seems to confirm to the same patterns that have
been observed for other sub-Saturns regarding planet mass and
multiplicity, orbital eccentricity, and stellar metallicity.
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