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

S. Borgniet, I. Boisse, A.-M. Lagrange, F. Bouchy, L. Arnold, R. F. Díaz, F. Galland, P. Delorme, G. Hébrard, A. Santerne, D. Ehrenreich, D. Ségransan, X. Bonfils, X. Delfosse, N. C. Santos, T. Forveille, C. Moutou, S. Udry, A. Eggenberger, F. Pepe, N. Astudillo, G. Montagnier

Abstract
Aims. In the context of the search for extrasolar planets and brown dwarfs around early-type main-sequence stars, we present the detection of a giant planet around the young F-type star HD113337.We estimated the age of the system to be 150+100-50 Myr. Interestingly, an IR excess attributed to a cold debris disk was previously detected on this star.
Methods. The SOPHIE spectrograph on the 1.93m telescope at Observatoire de Haute-Provence was used to obtain ≃ 300 spectra over 6 years. We used our SAFIR tool, dedicated to the spectra analysis of A and F stars, to derive the radial velocity variations.
Results. The data reveal a 324.0+1.7-3.3 days period that we attribute to a giant planet with a minimum mass of 2.83 ± 0.24 MJup in an eccentric orbit with e = 0.46 ± 0.04. A long-term quadratic drift, that we assign to be probably of stellar origin, is superimposed to the Keplerian solution.

Keywords
techniques: radial velocities - stars: early-type - stars: planetary systems - stars: individual: HD113337

Notes
Based on observations made with the SOPHIE spectrograph at the Observatoire de Haute-Provence (CNRS, France).
Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/561/A65

Astronomy and Astrophysics
Volume 561, Number of pages A65_1
2014 January

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia