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A Search for Exoplanets around Northern Circumpolar Stars VII. Detection of Planetary Companion Orbiting the Largest Host Star HD 18438

Lee, Byeong-Cheol; Park, Myeong-Gu; Choi, Yeon-Ho +3 more

We have been conducting a exoplanet search survey using Bohyunsen Observatory Echelle Spectrograph (BOES) for the last 18 years. We present the detection of exoplanet candidate in orbit around HD 18438 from high-precision radial velocity (RV) mesurements. The target was already reported in 2018 (Bang et al. 2018). They conclude that the RV variati…

A Search for Exoplanets around Northern Circumpolar Stars. VIII. Filtering Out a Planet Cycle from the Multi-Period Radial Velocity Variations in M Giant HD 36384

Lee, Byeong-Cheol; Park, Myeong-Gu; Lim, Beomdu +6 more

This paper is written as a follow-up observations to reinterpret the radial velocity (RV) of HD 36384, where the existence of planetary systems is known to be ambiguous. In giants, it is, in general, difficult to distinguish the signals of planetary companions from those of stellar activities. Thus, known exoplanetary giant hosts are relatively ra…

Search for Exoplanets around Northern Circumpolar Stars III. Long-Period Radial Velocity Variations in HD 18438 and HD 158996

Lee, Byeong-Cheol; Park, Myeong-Gu; Bang, Tae-Yang +2 more

Detecting exoplanets around giants are useful in understanding the later-stage evolution of planetary systems. We observed the M giant HD 18438 and the K giant HD 158996 as part of a Search for Exoplanets around Northern circumpolar Stars (SENS) and obtained 38 and 24 spectra from 2010 to 2017 using the high-resolution Bohyunsan Observatory Echell…

Evolutionary Status and Internal Structure of µ Cassiopeiae

Bach, Kiehunn

Distances of Globular Clusters based on Hipparcos Parallaxes of Nearby Subdwarfs

Lee, Sang-Gak; Saad, Somaya Mohamed

In the present study we have determined the distance moduli for seven globular clusters M2, M3, M10, M12, NGC 2808, NGC 6229 and NGC 6752, whose metallicities are in the range -1.54 < [Fe/H] < -1.10. We have derived distances for them by the main-sequence fitting method using a sample of local subdwarfs, whose accurate parallaxes are taken f…