| New observations and transit solutions of the inflated exoplanets HAT-P-40b and HAT-P-51b |
| |
| 作者姓名： | Diana P.Kjurkchieva Nikola I.Petrov Velimir A.Popov |
| |
| 作者单位： | Department of Physics and Astronomy;Institute of Astronomy and NAO |
| |
| 基金项目： | supported partly by project DN08/20 of Scientific Foundation of the Bulgarian Ministry of Education and Science;project D01277/16.12.2019 of the Bulgarian Ministry of Education and Science and project RD RD-08-116/2020 of Shumen University。 |
| |
| 摘 要： | We present high-precision photometric observations of the transiting exoplanets HAT-P-40 b and HAT-P-51 b by the Rozhen 2-m telescope.The newly-observed transit of HAT-P-40 b is the first one with a complete curve.The orbital periods of the two targets were improved.We modeled the observed transits and found bigger stellar radii than those derived from the stellar models.The planet radii of HATP-40 b and HAT-P-51 b obtained from our transit solutions are bigger than the values calculated by the empirical relations for Jupiter-mass and Saturn-mass planets respectively.Their values reveal the highlyinflated nature of the two targets,especially that of HAT-P-51 b.We established that the best transit solutions correspond to a quadratic limb-darkening law.The fitted limb-darkening coefficients of HAT-P-40 are close to the theoretical ones while those of HAT-P-51 are a little different.The precise astrometric Gaia distances of the two targets are smaller by 6%–7%than the calculated values from the stellar models.We propose the Gaia distances to be used for improvement of the stellar models as well as for more reliable calculation of the parameters of the known exoplanets.
|
| 关 键 词： | (Stars )planetary systems-techniques photometric-Stars individual(HAT-P-40 and HAT-P-51) |
| 本文献已被 维普 等数据库收录！ |
