천문학회지 (Journal of The Korean Astronomical Society)

  • 제56권2호
  • /
  • Pages.277-286
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  • 2023
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  • 1225-4614(pISSN)
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  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
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A Search for Exoplanets around Northern Circumpolar Stars. IX. A Multi-Period Analysis of the M Giant HD 135438

  • 투고 : 2023.10.27
  • 심사 : 2023.12.18
  • 발행 : 2023.12.30
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초록

It is difficult to distinguish the pure signal produced by an orbiting planetary companion around giant stars from other possible sources, such as stellar spots, pulsations, or certain activities. Since 2003, we have obtained radial (RV) data from evolved stars using the high-resolution, fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at the Bohyunsan Optical Astronomy Observatory (BOAO). Here, we report the results of RV variations in the binary star HD 135438. We found two significant periods: 494.98 d with eccentricity of 0.23 and 8494.1 d with eccentricity of 0.83. Considering orbital stability, it is impossible to have two companions in such close orbits with high eccentricity. To determine the nature of the changes in the RV variability, we analyzed indicators of stellar spot and stellar chromospheric activity to find that there are no signals related to the significant period of 494.98 d. However, we calculated the upper limits of rotation period of the rotational velocity and found this to be 478-536 d. One possible interpretation is that this may be closely related to the rotational modulation of an orbital inclination at 67-90 degrees. The other signal corresponding to the period of 8494.1 d is probably associated with a stellar companion orbiting the giant star. A Markov Chain Monte Carlo (MCMC) simulation considering a single companion indicates that HD 135438 system hosts a stellar companion with 0.57+0.017 -0.017 M⊙ with an orbital period of 8498 d.

키워드

과제정보

BCL acknowledges partial support by the KASI (Korea Astronomy and Space Science Institute) grant 2023-1-832-03 and acknowledge support by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No.2021R1A2C1009501). JRK and BL acknowledge support by the NRF grant funded by MSIT (Grant No. 2022R1C1C2004102). M.G.P. was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1I1A3A02062242), the National Research Foundation of Korea(NRF No-2018R1A6A1A06024970), and KASI under the R&D program supervised by the Ministry of Science, ICT and Future Planning. This research made use of the SIMBAD database, operated at the CDS, Strasbourg, France.

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