Issue |
A&A
Volume 558, October 2013
|
|
---|---|---|
Article Number | A55 | |
Number of page(s) | 13 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201321663 | |
Published online | 03 October 2013 |
HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity⋆
1
Max Planck Institute for Astronomy, Königstuhl 17, 69117
Heidelberg,
Germany
e-mail: mohler@mpia.de
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 (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/558/A55
© ESO, 2013
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