| KARJALAINEN, Marie, Raine KARJALAINEN, Artie P HATZES, Holger LEHMANN, Pierre KERVELLA, Saskia HEKKER, Van Winckel HANS, Jakub UBERLAUER, Michaela VÍTKOVÁ, Marek SKARKA, Petr KABATH, Saskia PRINS, Andrew TKACHENKO, William D COCHRAN a Alain JORISSEN. Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878. Astronomy and Astrophysics. EDP Sciences, 2022, roč. 668, December 2022, s. 1-14. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202244501. |
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@article{2253778,
author = {Karjalainen, Marie and Karjalainen, Raine and Hatzes, Artie P and Lehmann, Holger and Kervella, Pierre and Hekker, Saskia and Hans, Van Winckel and Uberlauer, Jakub and Vítková, Michaela and Skarka, Marek and Kabath, Petr and Prins, Saskia and Tkachenko, Andrew and Cochran, William D and Jorissen, Alain},
article_number = {December 2022},
doi = {http://dx.doi.org/10.1051/0004-6361/202244501},
keywords = {methods: observational; techniques: radial velocities; techniques: spectroscopic; stars: individual: KIC 3526061; stars: individual: HD 187878; brown dwarfs},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878},
url = {https://doi.org/10.1051/0004-6361/202244501},
volume = {668},
year = {2022}
}
TY - JOUR
ID - 2253778
AU - Karjalainen, Marie - Karjalainen, Raine - Hatzes, Artie P - Lehmann, Holger - Kervella, Pierre - Hekker, Saskia - Hans, Van Winckel - Uberlauer, Jakub - Vítková, Michaela - Skarka, Marek - Kabath, Petr - Prins, Saskia - Tkachenko, Andrew - Cochran, William D - Jorissen, Alain
PY - 2022
TI - Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878
JF - Astronomy and Astrophysics
VL - 668
IS - December 2022
SP - 1-14
EP - 1-14
PB - EDP Sciences
SN - 00046361
KW - methods: observational
KW - techniques: radial velocities
KW - techniques: spectroscopic
KW - stars: individual: KIC 3526061
KW - stars: individual: HD 187878
KW - brown dwarfs
UR - https://doi.org/10.1051/0004-6361/202244501
N2 - Context. Our knowledge of populations and the occurrence of planets orbiting evolved intermediate-mass stars is still incomplete. In 2010 we started a planet search programme among 95 giant stars observed by the Kepler mission to increase the sample of giant stars with planets and with reliable estimates of stellar masses and radii. Aims. We present the two systems from our planet search programme whose companions we were able to characterise: KIC 3526061 and HD 187878. Methods. We used precise stellar radial velocity measurements taken with four different echelle spectrographs to derive an orbital solution. We used Gaia astrometric measurements to obtain the inclination of the HD 187878 system and Kepler photometric observations to estimate the stellar mass and radius. Results. We report the discovery of a sub-stellar companion and a stellar companion around two intermediate-mass red giant branch stars. KIC 3526061 b is most likely a brown dwarf with a minimum mass of 18.15 +/- 0.44 M-Jupiter in a long-period eccentric orbit, with orbital period 3552(-135)(+158) d and orbital eccentricity e = 0.85 +/- 0.01. It is the most evolved system found having a sub-stellar companion with such a high eccentricity and wide separation. HD 187878 B has a minimum mass of 78.4 +/- 2.0 M-Jupiter. Combining the spectroscopic orbital parameters with the astrometric proper motion anomaly, we derived an orbital inclination i = 9.8(-0.6)(+0.4) deg, which corresponds to the companion's mass in the stellar regime of 0.51(-0.02)(+0.04) M-circle dot. Conclusions. A sub-stellar companion of KIC 3526061 extends the sample of known red giant branch stars with sub-stellar companions on very eccentric wide orbits, and might provide a probe of the dynamical evolution of such systems over time.
ER -
KARJALAINEN, Marie, Raine KARJALAINEN, Artie P HATZES, Holger LEHMANN, Pierre KERVELLA, Saskia HEKKER, Van Winckel HANS, Jakub UBERLAUER, Michaela VÍTKOVÁ, Marek SKARKA, Petr KABATH, Saskia PRINS, Andrew TKACHENKO, William D COCHRAN a Alain JORISSEN. Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878. \textit{Astronomy and Astrophysics}. EDP Sciences, 2022, roč.~668, December 2022, s.~1-14. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202244501.
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