Universität zu Köln

Van Eylen, V., Dai, F., Mathur, S., Gandolfi, D., Albrecht, S., Fridlund, M., Garcia, R. A., Guenther, E., Hjorth, M., Justesen, A. B., Livingston, J., Lund, M. N., Prerez Hernandez, F. P., Prieto-Arranz, J., Regulo, C., Bugnet, L., Everett, M. E., Hirano, T., Nespral, D., Nowak, G., Palle, E., Aguirre, V. Silva, Trifonov, T., Winn, J. N., Barragan, 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., Montanes Rodriguez, P., Narita, N., Patzold, M., Persson, C. M., Rodler, F. and Smith, A. M. S. (2018). HD 89345: a bright oscillating star hosting a transiting warm Saturn-sized planet observed by K2. Mon. Not. Roy. Astron. Soc., 478 (4). S. 4866 - 4881. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

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 themass and radius to be 1.12(-0.01)(+0.04) and 1.657(-0.004)(+0.020)R(circle dot), respectively. The star appears to have recently left the main sequence, based on the inferred age, 9.4(-1.3)(+0.4)Gyr, and the non-detection of mixed modes. The star hosts a 'warm Saturn' (P = 11.8 d, R-p = 6.86 +/- 0.14 R-circle plus). 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-circle plus. The data also show that the planet's orbit is eccentric (e approximate to 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Van Eylen, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dai, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gandolfi, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Albrecht, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fridlund, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia, R. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guenther, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hjorth, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Justesen, A. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Livingston, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lund, M. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prerez Hernandez, F. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prieto-Arranz, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Regulo, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bugnet, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Everett, M. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hirano, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nespral, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nowak, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palle, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aguirre, V. Silva UNSPECIFIED UNSPECIFIED UNSPECIFIED Trifonov, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winn, J. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barragan, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beck, P. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chaplin, W. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cochran, W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Csizmadia, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deeg, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endl, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heeren, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grziwa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hatzes, A. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hidalgo, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathis, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montanes Rodriguez, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Narita, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Patzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Persson, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rodler, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, A. M. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-177402
DOI:	10.1093/mnras/sty1390
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	478
Number:	4
Page Range:	S. 4866 - 4881
Date:	2018
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COOL DWARF STARS; TIDAL DISSIPATION; BALMER LINES; P-MODES; KEPLER; ROTATION; EVOLUTION; INCLINATION; CONSTRAINTS; FREQUENCIES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17740