Planetary companion in K giant σ persei

Byeong Cheol Lee; Inwoo Han; Myeong Gu Park; David E. Mkrtichian; Gwanghui Jeong; Kang Min Kim; Gennady Valyavin

doi:10.5303/JKAS.2014.47.2.69

Planetary companion in K giant σ persei

Byeong Cheol Lee, Inwoo Han, Myeong Gu Park, David E. Mkrtichian, Gwanghui Jeong, Kang Min Kim, Gennady Valyavin

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We report the detection of an exoplanet candidate in orbit around σ Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of 579.8 ± 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 σ 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 ± 0.5 M_⊙, we obtain a minimum planetary companion mass of 6.5 ± 1.0 M_Jup, with an orbital semi-major axis of 1.8 ± 0.1 AU, and an eccentricity of 0.3 ± 0.1 around σ Per.

Original language	English
Pages (from-to)	69-76
Number of pages	8
Journal	Journal of the Korean Astronomical Society
Volume	47
Issue number	2
DOIs	https://doi.org/10.5303/JKAS.2014.47.2.69
State	Published - 2014

Keywords

Star: Individual: σ Persei (HD 21552)
Techniques: Radial velocities

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title = "Planetary companion in K giant σ persei",

abstract = "We report the detection of an exoplanet candidate in orbit around σ Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of 579.8 ± 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 σ 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 ± 0.5 M⊙, we obtain a minimum planetary companion mass of 6.5 ± 1.0 MJup, with an orbital semi-major axis of 1.8 ± 0.1 AU, and an eccentricity of 0.3 ± 0.1 around σ Per.",

keywords = "Star: Individual: σ Persei (HD 21552), Techniques: Radial velocities",

author = "Lee, {Byeong Cheol} and Inwoo Han and Park, {Myeong Gu} and Mkrtichian, {David E.} and Gwanghui Jeong and Kim, {Kang Min} and Gennady Valyavin",

year = "2014",

doi = "10.5303/JKAS.2014.47.2.69",

language = "English",

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pages = "69--76",

journal = "Journal of the Korean Astronomical Society",

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T1 - Planetary companion in K giant σ persei

AU - Lee, Byeong Cheol

AU - Han, Inwoo

AU - Park, Myeong Gu

AU - Mkrtichian, David E.

AU - Jeong, Gwanghui

AU - Kim, Kang Min

AU - Valyavin, Gennady

PY - 2014

Y1 - 2014

N2 - We report the detection of an exoplanet candidate in orbit around σ Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of 579.8 ± 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 σ 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 ± 0.5 M⊙, we obtain a minimum planetary companion mass of 6.5 ± 1.0 MJup, with an orbital semi-major axis of 1.8 ± 0.1 AU, and an eccentricity of 0.3 ± 0.1 around σ Per.

AB - We report the detection of an exoplanet candidate in orbit around σ Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of 579.8 ± 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 σ 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 ± 0.5 M⊙, we obtain a minimum planetary companion mass of 6.5 ± 1.0 MJup, with an orbital semi-major axis of 1.8 ± 0.1 AU, and an eccentricity of 0.3 ± 0.1 around σ Per.

KW - Star: Individual: σ Persei (HD 21552)

KW - Techniques: Radial velocities

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DO - 10.5303/JKAS.2014.47.2.69

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AN - SCOPUS:84899999042

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VL - 47

SP - 69

EP - 76

JO - Journal of the Korean Astronomical Society

JF - Journal of the Korean Astronomical Society

IS - 2

ER -

Planetary companion in K giant σ persei

Abstract

Keywords

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