Astronomy and Astrophysics, volume 504, 617-623 (2009/9-3)
A planet around the evolved intermediate-mass star HD 110014.
DE MEDEIROS J.R., SETIAWAN J., HATZES A.P., PASQUINI L., GIRARDI L., UDRY S., DOELLINGER M.P. and DA SILVA L.
Abstract (from CDS):
We found evidence for a sub-stellar companion around the K giant star HD 110014. This cool evolved star, with a spectral type K2III and an estimated mass between 1.9 and 2.4M☉, is slightly metal rich with [Fe/H]=0.19 and a rotational velocity V sin i =2.0km/s. To search for extrasolar planets around intermediate-mass stars and to improve our knowledge of the nature of radial velocity variations shown by G and K giant stars. Based on radial velocity analysis, we found evidence for a substellar companion with a planetary mass and long orbital period. The Radial velocity variation of HD 110014 has been monitored from 2000 until 2007 with FEROS at 1.5m ESO and at the 2.2m MPG/ESO, HARPS at the 3.6m ESO and Coralie at 1.2m Leonard Euler swiss telescopes in La Silla observatory. The radial velocities were computed by using a cross-correlation technique. Line bisector, Hipparcos photometry and chromospheric lines were analyzed to exclude other root-causes for the radial velocity variability. We report the presence of an extrasolar planet around the giant star HD 110014, with an orbital period of 835.48±6.04days. A Keplerian orbit, with an eccentricity e=0.462±0.069, yields a minimum mass Msini=11.09MJup. The analysis of the residuals shows evidence for a second RV variability with a period of 130 days and an amplitude of ±100m/s . Its nature is not completely clear, but a second planet is a possible explanation.
stars: evolution - technique: radial velocities - stars: planetary systems - stars late-type
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