Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Home
Search
Quick Search
Advanced
Fulltext
Browse
Collections
Persons
My eDoc
Session History
Login
Name:
Password:
Documentation
Help
Support Wiki
Direct access to
document ID:


          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731862.0, MPI für Astronomie / Publikationen_mpia
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
Authors:Ortiz, M.; Reffert, S.; Trifonov, T.; Quirrenbach, A.; Mitchell, D. S.; Nowak, G.; Buenzli, E.; Zimmerman, N.; Bonnefoy, M.; Skemer, A.; Defrère, D.; Lee, M. H.; Fischer, D. A.; Hinz, P. M.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Volume:595
Start Page:id. A55 (14 pp)
Audience:Not Specified
Abstract / Description: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. <BR /> Aims: We aim at detecting and characterizing substellar and stellar companions to the giant star HD 59686 A (HR 2877, HIP 36616). <BR /> 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. <BR /> 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. <BR /> 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. Based on observations collected at the Lick Observatory, University of California.Based on observations collected at the Large Binocular Telescope, on Mount Graham, Arizona.RV data (Table A.1) are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/595/A55">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/595/A55</A>
Free Keywords:planetary systems; planets and satellites: formation; planets and satellites: fundamental parameters; planets and satellites: gaseous planets; planets and satellites: detection; planets and satellites: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201628791
URL:http://adsabs.harvard.edu/abs/2016A%26A...595A..55...
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.