HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity

Mohler-Fischer, M. and Mancini, L. and Hartman, J. D. and Bakos, G. A. and Penev, K. and Bayliss, D. and Jordan, A. and Csubry, Z. and Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Rabus, M. and Nikolov, N. and Brahm, R. and Espinoza, N. and Buchhave, L. A. and Beky, B. and Suc, V. and Csak, B. and Henning, T. and Wright, D. J. and Tinney, C. G. and Addison, B. C. and Schmidt, B. and Noyes, R. W. and Papp, I. and Lazar, J. and Sari, P. and Conroy, P. (2013) HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity. Astronomy and Astrophysics, 558:A55. pp. 1-13. ISSN 0004-6361

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Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Jan 2022 23:29
Last Modified: 31 Jan 2022 23:29
Uncontrolled Keywords: planetary systems; techniques: spectroscopic; stars: fundamental; parameters; techniques: photometric; stars: individual:; HATS-2; stars:; individual: GSC 6665-00236; Astrophysics - Earth and Planetary; Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1051/0004-6361/201321663
URI: http://eprints.usq.edu.au/id/eprint/45013

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