methods: data analysis; methods: observational; techniques: radial velocities; techniques: spectroscopic; stars: individual: HD 175370 (KIC 007940959); planetary systems
Abstract :
[en] We report on the discovery of a planetary companion candidate with a minimum mass M sin i = 4.6 ± 1.0 M[SUB]Jupiter[/SUB] orbiting the K2 III giant star HD 175370 (KIC 007940959). This star was a target in our programme to search for planets around a sample of 95 giant stars observed with Kepler. This detection was made possible using precise stellar radial velocity measurements of HD 175370 taken over five years and four months using the coudé echelle spectrograph of the 2-m Alfred Jensch Telescope and the fibre-fed echelle spectrograph High Efficiency and Resolution Mercator Echelle Spectrograph of the 1.2-m Mercator Telescope. Our radial velocity measurements reveal a periodic (349.5 ± 4.5 d) variation with a semi-amplitude K = 133 ± 25 m s[SUP]- 1[/SUP], superimposed on a long-term trend. A low-mass stellar companion with an orbital period of ˜88 yr in a highly eccentric orbit and a planet in a Keplerian orbit with an eccentricity e = 0.22 are the most plausible explanation of the radial velocity variations. However, we cannot exclude the existence of stellar envelope pulsations as a cause for the low-amplitude radial velocity variations and only future continued monitoring of this system may answer this uncertainty. From Kepler photometry, we find that HD 175370 is most likely a low-mass red giant branch or asymptotic giant branch star.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hrudková, M.; Isaac Newton Group of Telescopes, Apartado de Correos 321, Santa Cruz de La Palma E-38700, Spain
Hekker, S.; Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, Göttingen D-37077, Germany ; Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C DK-8000, Denmark
Hartmann, M.; Thüringer Landessternwarte Tautenburg, Sternwarte 5, Tautenburg D-07778, Germany
Tkachenko, A.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Prins, S.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Van Winckel, H.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
De Nutte, R.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium
Dumortier, L.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium
Frémat, Y.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium
Hensberge, H.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium
Jorissen, A.; Institut d' Astronomie et d' Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, Bruxelles B-1050, Belgium
Lampens, P.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium
Laverick, M.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Lombaert, R.; Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden ; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Pápics, P. I.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Raskin, G.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium
Sódor, Á.; Royal Observatory of Belgium, 3 Avenue Circulaire, Brussel B-1180, Belgium ; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest 1121, Hungary
Thoul, Anne ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Van Eck, S.; Institut d' Astronomie et d' Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, Bruxelles B-1050, Belgium
Waelkens, C.; Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D bus 2401, Leuven B-3001, Belgium)
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