The Pan-Pacific Planet Search III: Five companions orbiting giant stars

We report a new giant planet orbiting the K giant HD 155233, as well as four stellar-mass companions from the Pan-Pacific Planet Search, a southern hemisphere radial velocity survey for planets orbiting nearby giants and subgiants. We also present updated velocities and a refined orbit for HD 47205b...

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Bibliographic Details
Published in:arXiv.org 2015-10
Main Authors: Wittenmyer, R A, Butler, R P, Wang, L, Bergmann, C, Salter, G S, Tinney, C G, John Asher Johnson
Format: Article
Language:English
Subjects:
Giant stars
Planet detection
Radial velocity
Southern Hemisphere
Online Access:Get full text
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Summary:We report a new giant planet orbiting the K giant HD 155233, as well as four stellar-mass companions from the Pan-Pacific Planet Search, a southern hemisphere radial velocity survey for planets orbiting nearby giants and subgiants. We also present updated velocities and a refined orbit for HD 47205b (7 CMa b), the first planet discovered by this survey. HD 155233b has a period of 885\(\pm\)63 days, eccentricity e=0.03\(\pm\)0.20, and m sin i=2.0\(\pm\)0.5 M_jup. The stellar-mass companions range in m sin i from 0.066 M_sun to 0.33 M_sun. Whilst HD 104358B falls slightly below the traditional 0.08 M_sun hydrogen-burning mass limit, and is hence a brown dwarf candidate, we estimate only a 50% a priori probability of a truly substellar mass.
ISSN:2331-8422
DOI:10.48550/arxiv.1510.04343