Browsing by Author "Beky, B."

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    Hat-P -27B: a hot Jupiter transiting a G star on a 3 day orbit
    (2011) Beky, B.; Jordán Colzani, Andrés Cristóbal; Arriagada, Pamela V.
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    HAT-P-27b: A HOT JUPITER TRANSITING A G STAR ON A 3 DAY ORBIT
    (2011) Beky, B.; Bakos, G. A.; Hartman, J.; Torres, G.; Latham, D. W.; Jordan, A.; Arriagada, P.; Bayliss, D.; Kiss, L. L.; Kovacs, Geza; Quinn, S. N.; Marcy, G. W.; Howard, A. W.; Fischer, D. A.; Johnson, J. A.; Esquerdo, G. A.; Noyes, R. W.; Buchhave, L. A.; Sasselov, D. D.; Stefanik, R. P.; Perumpilly, G.; Lazar, J.; Papp, I.; Sari, P.
    We report the discovery of HAT-P-27b, an exoplanet transiting the moderately bright G8 dwarf star GSC 0333-00351 (V = 12.214). The orbital period is 3.039586 +/- 0.000012 days, the reference epoch of transit is 2455186.01879 +/- 0.00054 (BJD), and the transit duration is 0.0705 +/- 0.0019 days. The host star with its effective temperature 5300 +/- 90 K is somewhat cooler than the Sun and is more metal-rich with a metallicity of +0.29 +/- 0.10. Its mass is 0.94 +/- 0.04 M-circle dot and radius is 0.90(-0.04)(+0.05) R-circle dot. For the planetary companion we determine a mass of 0.660 +/- 0.033 M-J and radius of 1.038(-0.058)(+0.077) R-J. For the 30 known transiting exoplanets between 0.3 M-J and 0.8 M-J, a negative correlation between host star metallicity and planetary radius and an additional dependence of planetary radius on equilibrium temperature are confirmed at a high level of statistical significance.
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    HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity
    (2013) Mohler-Fischer, M.; Mancini, L.; Hartman, J. D.; Bakos, G. A.; Penev, K.; Bayliss, D.; Jordan, A.; Csubry, Z.; Zhou, G.; Rabus, M.; Nikolov, N.; Brahm, R.; Espinoza, N.; Buchhave, L. A.; Beky, B.; Suc, V.; Csak, B.; Henning, T.; Wright, D. J.; Tinney, C. G.; Addison, B. C.; Schmidt, B.; Noyes, R. W.; Papp, I.; Lazar, J.; Sari, P.; Conroy, P.
    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 2.2m/GROND, Faulkes Telescope South/Spectral transit photometry, and MPG/ESO 2.2m/FEROS, Euler 1.2m/CORALIE, AAT 3.9m/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 fi and a radius of 0.89 +/- 0.02 R fi, 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 angstrom). The two light curves contain anomalies compatible with starspots on the photosphere of the host star along the same transit chord.