THE PAN-PACIFIC PLANET SEARCH. VI. GIANT PLANETS ORBITING HD 86950 AND HD 222076
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
IOP PUBLISHING LTD
Abstract
We report the detection of two new planets orbiting the K giants HD 86950 and HD 222076, based on precise radial velocities obtained with three instruments: AAT/UCLES, FEROS, and CHIRON. HD 86950b has a period of 1270 +/- 57 days at a=2.72 +/- 0.08 AU, and m sin i=3.6 +/- 0.7 M-Jup. HD 222076b has P=871 +/- 19 days at a=1.83 +/- 0.03 AU, and m sin i=1.56 +/- 0.11 M-Jup. These two giant planets are typical of the population of planets known to orbit evolved stars. In addition, we find a high-amplitude periodic velocity signal (K similar to 50 m/s(-1)) in HD 29399, and show that it is due to stellar variability rather than Keplerian reflex motion. We also investigate the relation between planet occurrence and host-star metallicity for the 164-star Pan-Pacific Planet Search sample of evolved stars. In spite of the small sample of PPPS detections, we confirm the trend of increasing planet occurrence as a function of metallicity found by other studies of planets orbiting evolved stars.
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Keywords
planetary systems, stars: individual(HD 29399, HD 86950, HD 222076), techniques: radial velocities, PRECISE RADIAL-VELOCITIES, SPECTROSCOPIC STELLAR PARAMETERS, ALL-SKY SURVEY, EVOLVED STARS, HOST STAR, FUNDAMENTAL PARAMETERS, HABITABLE-ZONE, MASS STARS, METALLICITY, COMPANIONS