EPJ Web of Conferences 11, 02003 (2011)
https://doi.org/10.1051/epjconf/20101102003

HD15082b, a short-period planet orbiting an A-star

¹ Thüringer Landessternwarte Tautenburg, D07778 Tautenburg, Germany
[guenther@tls-tautenburg.de]
² SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Five KY16 9SS, UK
³ Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
⁴ Instituto de Astrofísica de Canarias, C/Vía Láctea, s/n, E38205 – La Laguna (Tenerife), Spain
⁵ McDonald Observatory, University of Texas, Austin, TX 78712, USA
⁶ Argelander-Institut fr Astronomie der Universität Bonn, Auf dem Huegel 71, D53121 Bonn, Germany

Abstract

Most of the known transiting extrasolar planets orbit slowly rotating F, G or K stars. In here we report on the detection of a transiting planet orbiting the bright, rapidly rotating A5 star HD15082, recently made by SuperWASP. Time resolved spectroscopic observations taken during transit show a hump caused by the planet crossing the line profile. From the analysis of the spectra, we derive the radius of the planet and find that it is orbiting retrograde in respect to the spin of the star. Because of its small distance from an A5 star, this planet must be one of the hottest planets known, which makes it relatively easy to detect it in the IR. We thus tried to detect it using the TNG but did not succeed. Using direct imaging, we search for possible companions, and found one candidate.