Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system

Ortiz, M.; Reffert, S.; Trifonov, T.; Quirrenbach, A.; Mitchell, D.; Nowak, G.; Buenzli, E.; Zimmerman, N.; Bonnefoy, M.; Skemer, A.; Defrere, Denis; Lee, M. H.; Fischer, D.; Hinz, P.

doi:10.1051/0004-6361/201628791

Article (Scientific journals)

Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system

Ortiz, M.; Reffert, S.; Trifonov, T. et al.

2016 • In Astronomy and Astrophysics, 595 (A55), p. 14

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https://hdl.handle.net/2268/203136

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10.1051/0004-6361/201628791

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Keywords :

Astrophysics - Earth and Planetary Astrophysics; Exoplanet; Direct imaging; Radial velocity

Abstract :

[en] Context. For over 12 yr, we have carried out a precise radial velocity (RV) survey of a sample of 373 G- and K-giant stars using the Hamilton Échelle Spectrograph at the Lick Observatory. There are, among others, a number of multiple planetary systems in our sample as well as several planetary candidates in stellar binaries. Aims: We aim at detecting and characterizing substellar and stellar companions to the giant star HD 59686 A (HR 2877, HIP 36616). Methods: We obtained high-precision RV measurements of the star HD 59686 A. By fitting a Keplerian model to the periodic changes in the RVs, we can assess the nature of companions in the system. To distinguish between RV variations that are due to non-radial pulsation or stellar spots, we used infrared RVs taken with the CRIRES spectrograph at the Very Large Telescope. Additionally, to characterize the system in more detail, we obtained high-resolution images with LMIRCam at the Large Binocular Telescope. Results: We report the probable discovery of a giant planet with a mass of mp sin i = 6.92-0.24+0.18 MJup orbiting at ap = 1.0860-0.0007+0.0006 au from the giant star HD 59686 A. In addition to the planetary signal, we discovered an eccentric (eB = 0.729-0.003+0.004) binary companion with a mass of mB sin i = 0.5296-0.0008+0.0011 M⊙ orbiting at a close separation from the giant primary with a semi-major axis of aB = 13.56-0.14+0.18 au. Conclusions: The existence of the planet HD 59686 Ab in a tight eccentric binary system severely challenges standard giant planet formation theories and requires substantial improvements to such theories in tight binaries. Otherwise, alternative planet formation scenarios such as second-generation planets or dynamical interactions in an early phase of the system's lifetime need to be seriously considered to better understand the origin of this enigmatic planet.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Ortiz, M.

Reffert, S.

Trifonov, T.

Quirrenbach, A.

Mitchell, D.

Nowak, G.

Buenzli, E.

Zimmerman, N.

Bonnefoy, M.

Skemer, A.

More authors (4 more)

Language :

English

Title :

Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system

Publication date :

2016

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

595

Issue :

A55

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

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https://www.aanda.org/articles/aa/abs/2016/11/aa28791-16/aa28791-16.html

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