A search for exoplanets around northern circumpolar stars vi. Detection of planetary companions orbiting the giants hd 60292 and hd 112640

Byeong Cheol Lee; Myeong Gu Park; Inwoo Han; Tae Yang Bang; Hyeong Il Oh; Yeon Ho Choi

doi:10.5303/JKAS.2020.53.1.27

A search for exoplanets around northern circumpolar stars vi. Detection of planetary companions orbiting the giants hd 60292 and hd 112640

Byeong Cheol Lee, Myeong Gu Park, Inwoo Han, Tae Yang Bang, Hyeong Il Oh, Yeon Ho Choi

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2 Scopus citations

Abstract

We report the detection of exoplanet candidates in orbits around HD 60292 and HD 112640 from a radial velocity (RV) survey. The stars exhibit RV variations with periods of 495 ± 3 days and 613 ± 6 days, respectively. These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey using the fiber-fed Bohyunsan Observatory Echelle Spectrograph installed at the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory in Korea. The aim of the survey is to search for planetary or substellar companions. We argue that the periodic RV variations are not related to surface inhomogeneities; rather, Keplerian motions of planetary companions are the most likely interpretation. Assuming stellar masses of 1.7 ± 0.2M_⊙(HD 60292) and 1.8 ± 0.2M_⊙ (HD 112640), we obtain minimum planetary companion masses of 6.5 ± 1.0M_Jup and 5.0 ± 1.0M_Jup, and periods of 495.4 ± 3.0 days and 613.2 ± 5.8 days, respectively.

Original language	English
Pages (from-to)	27-34
Number of pages	8
Journal	Journal of the Korean Astronomical Society
Volume	53
Issue number	1
DOIs	https://doi.org/10.5303/JKAS.2020.53.1.27
State	Published - 2020

Keywords

HD 112640 — techniques: radial velocities
Planetary systems — stars: individual: HD 60292

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title = "A search for exoplanets around northern circumpolar stars vi. Detection of planetary companions orbiting the giants hd 60292 and hd 112640",

abstract = "We report the detection of exoplanet candidates in orbits around HD 60292 and HD 112640 from a radial velocity (RV) survey. The stars exhibit RV variations with periods of 495 ± 3 days and 613 ± 6 days, respectively. These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey using the fiber-fed Bohyunsan Observatory Echelle Spectrograph installed at the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory in Korea. The aim of the survey is to search for planetary or substellar companions. We argue that the periodic RV variations are not related to surface inhomogeneities; rather, Keplerian motions of planetary companions are the most likely interpretation. Assuming stellar masses of 1.7 ± 0.2M⊙(HD 60292) and 1.8 ± 0.2M⊙ (HD 112640), we obtain minimum planetary companion masses of 6.5 ± 1.0MJup and 5.0 ± 1.0MJup, and periods of 495.4 ± 3.0 days and 613.2 ± 5.8 days, respectively.",

keywords = "HD 112640 — techniques: radial velocities, Planetary systems — stars: individual: HD 60292",

author = "Lee, {Byeong Cheol} and Park, {Myeong Gu} and Inwoo Han and Bang, {Tae Yang} and Oh, {Hyeong Il} and Choi, {Yeon Ho}",

year = "2020",

doi = "10.5303/JKAS.2020.53.1.27",

language = "English",

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AU - Lee, Byeong Cheol

AU - Park, Myeong Gu

AU - Han, Inwoo

AU - Bang, Tae Yang

AU - Oh, Hyeong Il

AU - Choi, Yeon Ho

PY - 2020

Y1 - 2020

N2 - We report the detection of exoplanet candidates in orbits around HD 60292 and HD 112640 from a radial velocity (RV) survey. The stars exhibit RV variations with periods of 495 ± 3 days and 613 ± 6 days, respectively. These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey using the fiber-fed Bohyunsan Observatory Echelle Spectrograph installed at the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory in Korea. The aim of the survey is to search for planetary or substellar companions. We argue that the periodic RV variations are not related to surface inhomogeneities; rather, Keplerian motions of planetary companions are the most likely interpretation. Assuming stellar masses of 1.7 ± 0.2M⊙(HD 60292) and 1.8 ± 0.2M⊙ (HD 112640), we obtain minimum planetary companion masses of 6.5 ± 1.0MJup and 5.0 ± 1.0MJup, and periods of 495.4 ± 3.0 days and 613.2 ± 5.8 days, respectively.

AB - We report the detection of exoplanet candidates in orbits around HD 60292 and HD 112640 from a radial velocity (RV) survey. The stars exhibit RV variations with periods of 495 ± 3 days and 613 ± 6 days, respectively. These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey using the fiber-fed Bohyunsan Observatory Echelle Spectrograph installed at the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory in Korea. The aim of the survey is to search for planetary or substellar companions. We argue that the periodic RV variations are not related to surface inhomogeneities; rather, Keplerian motions of planetary companions are the most likely interpretation. Assuming stellar masses of 1.7 ± 0.2M⊙(HD 60292) and 1.8 ± 0.2M⊙ (HD 112640), we obtain minimum planetary companion masses of 6.5 ± 1.0MJup and 5.0 ± 1.0MJup, and periods of 495.4 ± 3.0 days and 613.2 ± 5.8 days, respectively.

KW - HD 112640 — techniques: radial velocities

KW - Planetary systems — stars: individual: HD 60292

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A search for exoplanets around northern circumpolar stars vi. Detection of planetary companions orbiting the giants hd 60292 and hd 112640

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