Volume 558, October 2013
|Number of page(s)||13|
|Section||Planets and planetary systems|
|Published online||03 October 2013|
HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity⋆
Max Planck Institute for Astronomy, Königstuhl 17, 69117
2 Astrophysics Group, School of Physics, University of Exeter, Stocker Road, EX4 4QL, Exeter, UK
3 Exoplanetary Science at UNSW, School of Physics, University of New South Wales, 2052, Australia
4 Australian Centre for Astrobiology, University of New South Wales, 2052 Kensington, Australia
5 Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
6 Harvard-Smithonian Center for Astrophysics, Cambridge, MA, USA
7 Research School of Astronomy and Astrophysics, Australian National University, 2611 Canberra, Australia
8 Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
9 Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
10 Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, 1350 Copenhagen, Denmark
11 Hungarian Astronomical Association, 1158 Budapest, Hungary
12 ELTE Gothard–Lendület Research Group, 9700 Szombathely, Hungary
Received: 8 April 2013
Accepted: 26 June 2013
We report the discovery of HATS-2b, the second transiting extrasolar planet detected by the HATSouth survey. HATS-2b is moving on a circular orbit around a V = 13.6 mag, K-type dwarf star (GSC 6665-00236), at a separation of 0.0230 ± 0.0003 AU and with a period of 1.3541 days. The planetary parameters have been robustly determined using a simultaneous fit of the HATSouth, MPG/ESO 2.2 m/GROND, Faulkes Telescope South/Spectral transit photometry, and MPG/ESO 2.2 m/FEROS, Euler 1.2 m/CORALIE, AAT 3.9 m/CYCLOPS radial-velocity measurements. HATS-2b has a mass of 1.37 ± 0.16 MJ, a radius of 1.14 ± 0.03 RJ, and an equilibrium temperature of 1567 ± 30 K. The host star has a mass of 0.88 ± 0.04 M⊙ and a radius of 0.89 ± 0.02 R⊙, and it shows starspot activity. We characterized the stellar activity by analyzing two photometric follow-up transit light curves taken with the GROND instrument, both obtained simultaneously in four optical bands (covering the wavelength range of 3860−9520 Å). The two light curves contain anomalies compatible with starspots on the photosphere of the host star along the same transit chord.
Key words: planetary systems / techniques: spectroscopic / stars: fundamental parameters / techniques: photometric / stars: individual: HATS-2 / stars: individual: GSC 6665-00236
Tables of the individual photometric measurements are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/558/A55
© ESO, 2013
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