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http://dx.doi.org/10.5303/JKAS.2014.47.2.69

PLANETARY COMPANION IN K GIANT σ PERSEI  

Lee, Byeong-Cheol (Korea Astronomy and Space Science Institute)
Han, Inwoo (Korea Astronomy and Space Science Institute)
Park, Myeong-Gu (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
Mkrtichian, David E. (National Astronomical Research Institute of Thailand)
Jeong, Gwanghui (Korea Astronomy and Space Science Institute)
Kim, Kang-Min (Korea Astronomy and Space Science Institute)
Valyavin, Gennady (Special Astrophysical Observatory, Russian Academy of Sciences)
Publication Information
Journal of The Korean Astronomical Society / v.47, no.2, 2014 , pp. 69-76 More about this Journal
Abstract
We report the detection of an exoplanet candidate in orbit around ${\sigma}$ Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of $579.8{\pm}2.4$ days. The purpose of the survey is to search for low-amplitude and long-period RV variations in giants and examine the origin of the variations using the fiber-fed Bohyunsan Observatory Echelle Spectrograph installed at the 1.8-m telescope of Bohyunsan Optical Astronomy Observatory in Korea. We present high-accuracy RV measurements of ${\sigma}$ Per made from December 2003 to January 2014. We argue that the RV variations are not related to the surface inhomogeneities but instead a Keplerian motion of the planetary companion is the most likely explanation. Assuming a stellar mass of $2.25{\pm}0.5$ $M_{\odot}$, we obtain a minimum planetary companion mass of $6.5{\pm}1.0$ $M_{Jup}$, with an orbital semi-major axis of $1.8{\pm}0.1$ AU, and an eccentricity of $0.3{\pm}0.1$ around ${\sigma}$ Per.
Keywords
star: individual: ${\sigma}$ Persei (HD 21552); techniques: radial velocities;
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