Journal
ASTRONOMY & ASTROPHYSICS
Volume 556, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321660
Keywords
stars: horizontal-branch; planet-star interactions; stars: late-type; planetary systems; stars: individual: HIP 63242
Categories
Funding
- Fondecyt [1120299, 3110004]
- ALMA-Conicyt [31080027]
- BASAL PFB-06
- GEMINI-CONICYT FUND
- Comite Mixto ESO-GOBIERNO DE CHILE
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Context. More than 40 planets have been found around giant stars, revealing a lack of systems orbiting interior to similar to 0.6 AU. This observational fact contrasts with the planetary population around solar-type stars and has been interpreted as the result of the orbital evolution of planets through the interaction with the host star and/or because of a different formation/migration scenario of planets around more massive stars. Aims. We are conducting a radial velocity study of a sample of 166 giant stars aimed at studying the population of close-in planets orbiting post-main sequence stars. Methods. We computed precision radial velocities from multi-epoch spectroscopic data to search for planets around giant stars. Results. We present the discovery of a massive planet around the intermediate-mass giant star HIP 63242. The best Keplerian fit to the data leads to an orbital distance of 0.57 AU, an eccentricity of 0.23 and a projected mass of 9.2 M-J. HIP 63242 b is the innermost planet detected around any intermediate-mass giant star and also the first planet detected in our survey.
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