Extrasolar planets and brown dwarfs around A--F type stars. VIII. A giant planet orbiting the young star HD113337

摘要

In the frame of the search for extrasolar planets and brown dwarfs aroundearly-type main-sequence stars, we present the detection of a giant planetaround the young F-type star HD113337. We estimated the age of the system to be150 +100/-50 Myr. Interestingly, an IR excess attributed to a cold debris diskwas previously detected on this star. The SOPHIE spectrograph on the 1.93mtelescope at Observatoire de Haute-Provence was used to obtain ~300 spectraover 6 years. We used our SAFIR tool, dedicated to the spectra analysis of Aand F stars, to derive the radial velocity variations. The data reveal a 324.0+1.7/-3.3 days period that we attribute to a giant planet with a minimum massof 2.83 +- 0.24 Mjup in an eccentric orbit with e=0.46 +- 0.04. A long-termquadratic drift, that we assign to be probably of stellar origin, issuperimposed to the Keplerian solution.