Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314

2010/05/17 by Bun’ei Sato, Bun'ei Sato, Masashi Omiya +16 · 5 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.EP

paper · pdf · doi:10.1093/pasj/62.4.1063

16 pages, 4 figures, accepted for publication in PASJ

arxiv created 2010/05/17 · openalex publication_date 2010/08/25 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report the detections of two substellar companions orbiting around evolved intermediate-mass stars from precise Doppler measurements at Subaru Telescope and Okayama Astrophysical Observatory. HD 145457 is a K0 giant with a mass of 1.9 M_sun and has a planet of minimum mass m₂sini=2.9 M_J orbiting with period of P=176 d and eccentricity of e=0.11. HD 180314 is also a K0 giant with 2.6 M_sun and hosts a substellar companion of m₂sin i=22 M_J, which falls in brown-dwarf mass regime, in an orbit with P=396 d and e=0.26. HD 145457 b is one of the innermost planets and HD 180314 b is the seventh candidate of brown-dwarf-mass companion found around intermediate-mass evolved stars.

Citations

• Studies in astronomical time series analysis. II - Statistical aspects of spectral analysis of unevenly spaced data
• A Substellar Companion to the Intermediate‐Mass Giant 11 Comae
• Catalog of Nearby Exoplanets
• Models of giant planet formation with migration and disc evolution

Cited by

• The Pan-Pacific Planet Search. I. A Giant Planet Orbiting 7 CMa
• Substellar Companions to Seven Evolved Intermediate-Mass Stars
• A planetary companion around the K giant eps Corona Borealis
• Spatially Resolved Images of Dust Belt(s) Around the Planet-hosting Subgiant Kappa CrB
• Corona Borealis [wikipedia]