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26 April 2024 |
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HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity | | M. Mohler-Fischer
; L. Mancini
; J. D. Hartman
; G. B. Bakos
; K. Penev
; D. Bayliss
; A. Jordan
; Z. Csubry
; G. Zhou
; M. Rabus
; N. Nikolov
; R. Brahm
; N. Espinoza
; L. A. Buchhave
; B. Beky
; V. Suc
; B. Csak
; T. Henning
; D. J. Wright
; C. G. Tinney
; B. C. Addison
; B. Schmidt
; R. W. Noyes
; I. Papp
; J. Lazar
; P. Sari
; P. Conroy
; | | Date: |
8 Apr 2013 | | 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 pm
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 pm 0.16 M_J, a radius of 1.14 pm
0.03 R_J and an equilibrium temperature of 1567 pm 30 K. The host star has a
mass of 0.88 pm 0.04 M_Sun, radius of 0.89 pm 0.02 R_Sun and shows starspot
activity. We characterized the stellar activity by analysing 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 AA). The two light curves contain anomalies compatible with
starspots on the photosphere of the parent star along the same transit chord. | | Source: | arXiv, 1304.2140 | | Services: | Forum | Review | PDF | Favorites | |
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