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. … 展开作者
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
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 Å). The two light curves contain anomalies compatible with starspots on the photosphere of the parent star along the same transit chord.
A Tentative Detection of a Starspot During Consecutive Transits of an Extrasolar Planet from the Ground: No Evidence of a Double Transiting Planet System Around TrES-1
HATS-9b and HATS-10b: Two Compact Hot Jupiters in Field 7 of the K2 Mission
我们报告的发现两个凌日系外行星的HAT南调查。HATS-9 b围绕一颗老的（10.8 $\pm$ 1.5 Gyr）V=13.3 G的矮星运行，周期P = 1.9153 d。主恒星质量为1.03 M $_{\odot}$，半径为1.503 R $_\odot$，有效温度为5366 $\pm$ 70 K。行星伴星的质量为0.837 M $_J$，半径为1.065 R $_J$，平均密度为0.85 g cm $^{-3}$。HATS-10 b围绕一颗V=13.1 G的矮星运行，周期P = 3.3128 d。主恒星质量为1.1 M $_\odot$，半径为1.11 R $_\odot$，有效温度为5880 $\pm$ 120 K。行星伴星的质量为0.53 M $_J$，半径为0.97 R $_J$，平均密度为0.7 g cm $^{-3}$。这两颗行星都是紧凑的，与接受类似辐射的行星相比，它们都位于K2的场7的名义坐标上，但只有HATS-9 b落在工作硅上。HATS-9 b的未来特性与开普勒望远镜的精密光度精度可能会提供其反射光特征的测量。
GEMS JWST: HATS-75 b -- A giant planet with a sub-solar metallicity atmosphere orbiting an M-dwarf
Johns Hopkins University Applied Physics Laboratory（约翰斯·霍普金斯大学应用物理实验室）；The Pennsylvania State University（宾夕法尼亚州立大学）；University of Tampa（坦帕大学）；Carnegie Science（卡内基科学）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；University of Maryland（马里兰大学）；University of Birmingham（伯明翰大学）；University of St. Andrews（圣安德鲁斯大学）；University of California, Irvine（加州大学尔湾分校）
