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We have been conducting a exoplanet search survey using Bohyunsan ObservatoryEchelle Spectrograph (BOES) for the last 18 years. We present the detection ofexoplanet candidate in orbit around HD 18438 from high-precision radialvelocity (RV) mesurements. The target was already reported in 2018 (Bang et al.2018). They conclude that the RV variations with a period of 719 days arelikely to be caused by the pulsations because the Lomb-Scargle periodogram ofHIPPARCOS photometric and Ha EW variations for HD 18438 show peaks with periodsclose to that of RV variations and there were no correlations between bisectorsand RV measurements. However, the data were not sufficient to reach a firmconclusion. We obtained more RV data for four years. The longer time baselineyields a more accurate determination with a revised period of 803 +/- 5 daysand the planetary origin of RV variations with a minimum planetary companionmass of 21 +/- 1 MJup. Our current estimate of the stellar parameters for HD18438 makes it currently the largest star with a planetary companion.

A search for exoplanets around north circumpolar stars. VII. Detection of planetary companion orbiting the largest host star HD 18438