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

M. Mohler-Fischer; L. Mancini; J. D. Hartman; G. Á. Bakos; K. Penev; D. Bayliss; A. Jordán; Z. Csubry; G. Zhou; M. Rabus; N. Nikolov; R. Brahm; N. Espinoza; Lars A. Buchhave; B. Béky; V. Suc; B. Csák; T. Henning; D. J. Wright; C. G. Tinney; B. C. Addison; B. Schmidt; R. W. Noyes; I. Papp; J. Lázár; P. Sári; P. Conroy

doi:10.1051/0004-6361/201321663

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

M. Mohler-Fischer, L. Mancini, J. D. Hartman, G. Á. Bakos, K. Penev, D. Bayliss, A. Jordán, Z. Csubry, G. Zhou, M. Rabus, N. Nikolov, R. Brahm, N. Espinoza, Lars A. Buchhave, B. Béky, V. Suc, B. Csák, T. Henning, D. J. Wright, C. G. TinneyB. C. Addison, B. Schmidt, R. W. Noyes, I. Papp, J. Lázár, P. Sári, P. Conroy

Astrophysics and Planetary Science

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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 M_J, a radius of 1.14 ± 0.03 R_J, and an equilibrium temperature of 1567 ± 30 K. The host star has a mass of 0.88 ± 0.04 M _âŠ™ and a radius of 0.89 ± 0.02 R _âŠ™, 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.

Original language	English
Article number	A55
Journal	Astronomy & Astrophysics
Volume	558
Number of pages	13
ISSN	0004-6361
DOIs	https://doi.org/10.1051/0004-6361/201321663
Publication status	Published - 1 Oct 2013

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Mohler-Fischer, M., Mancini, L., Hartman, J. D., Bakos, G. Á., Penev, K., Bayliss, D., Jordán, A., Csubry, Z., Zhou, G., Rabus, M., Nikolov, N., Brahm, R., Espinoza, N., Buchhave, L. A., Béky, B., Suc, V., Csák, B., Henning, T., Wright, D. J., ... Conroy, P. (2013). HATS-2b: a transiting extrasolar planet orbiting a K-type star showing starspot activity. Astronomy & Astrophysics, 558, [A55]. https://doi.org/10.1051/0004-6361/201321663

Mohler-Fischer, M, Mancini, L, Hartman, JD, Bakos, GÁ, Penev, K, Bayliss, D, Jordán, A, Csubry, Z, Zhou, G, Rabus, M, Nikolov, N, Brahm, R, Espinoza, N, Buchhave, LA, Béky, B, Suc, V, Csák, B, Henning, T, Wright, DJ, Tinney, CG, Addison, BC, Schmidt, B, Noyes, RW, Papp, I, Lázár, J, Sári, P & Conroy, P 2013, 'HATS-2b: a transiting extrasolar planet orbiting a K-type star showing starspot activity', Astronomy & Astrophysics, vol. 558, A55. https://doi.org/10.1051/0004-6361/201321663

@article{9ea49f366b9a4eb0ad2319c76d37a214,

title = "HATS-2b: a transiting extrasolar planet orbiting a K-type star showing starspot activity",

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 {\^a}{\v S}{\texttrademark} and a radius of 0.89 ± 0.02 R {\^a}{\v S}{\texttrademark}, 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 {\AA}). The two light curves contain anomalies compatible with starspots on the photosphere of the host star along the same transit chord.",

author = "M. Mohler-Fischer and L. Mancini and Hartman, {J. D.} and Bakos, {G. {\'A}.} and K. Penev and D. Bayliss and A. Jord{\'a}n and Z. Csubry and G. Zhou and M. Rabus and N. Nikolov and R. Brahm and N. Espinoza and Buchhave, {Lars A.} and B. B{\'e}ky and V. Suc and B. Cs{\'a}k and T. Henning and Wright, {D. J.} and Tinney, {C. G.} and Addison, {B. C.} and B. Schmidt and Noyes, {R. W.} and I. Papp and J. L{\'a}z{\'a}r and P. S{\'a}ri and P. Conroy",

year = "2013",

month = oct,

day = "1",

doi = "10.1051/0004-6361/201321663",

language = "English",

volume = "558",

journal = "Astronomy and Astrophysics Supplement Series",

issn = "0004-6361",

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TY - JOUR

T1 - HATS-2b

T2 - a transiting extrasolar planet orbiting a K-type star showing starspot activity

AU - Mohler-Fischer, M.

AU - Mancini, L.

AU - Hartman, J. D.

AU - Bakos, G. Á.

AU - Penev, K.

AU - Bayliss, D.

AU - Jordán, A.

AU - Csubry, Z.

AU - Zhou, G.

AU - Rabus, M.

AU - Nikolov, N.

AU - Brahm, R.

AU - Espinoza, N.

AU - Buchhave, Lars A.

AU - Béky, B.

AU - Suc, V.

AU - Csák, B.

AU - Henning, T.

AU - Wright, D. J.

AU - Tinney, C. G.

AU - Addison, B. C.

AU - Schmidt, B.

AU - Noyes, R. W.

AU - Papp, I.

AU - Lázár, J.

AU - Sári, P.

AU - Conroy, P.

PY - 2013/10/1

Y1 - 2013/10/1

N2 - 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 âŠ™ and a radius of 0.89 ± 0.02 R âŠ™, 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.

AB - 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 âŠ™ and a radius of 0.89 ± 0.02 R âŠ™, 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.

U2 - 10.1051/0004-6361/201321663

DO - 10.1051/0004-6361/201321663

M3 - Journal article

SN - 0004-6361

VL - 558

JO - Astronomy and Astrophysics Supplement Series

JF - Astronomy and Astrophysics Supplement Series

M1 - A55

ER -

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

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