Astronomy:HAT-P-20
HAT-P-20 is a K-type main-sequence star about 233 light-years away. The star has a strong starspot activity,[1] and its equatorial plane is misaligned by 36+10−12° with the planetary orbit.[2] Although star with a giant planet on close orbit is expected to be spun-up by tidal forces, only weak indications of tidal spin-up were detected.[3]
Planetary system
In 2010 a transiting hot super-Jovian planet was detected.[4] Its equilibrium temperature is 996±19 K.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 7.59±0.12 MJ | 0.03671±0.00027 | 2.8753172±0.0000003 | 0.0172±0.0016 | 86.3±0.1° | 0.952±0.017 RJ |
References
- ↑ 1.0 1.1 Sun, Leilei; Gu, Shenghong; Wang, Xiaobin; Collier Cameron, Andrew; Cao, Dongtao; Wang, Yibo; Xiang, Yue; Hui, Ho-Keung et al. (2017). "Refined System Parameters and TTV Study of Transiting Exoplanetary System HAT-P-20". The Astronomical Journal 153 (1): 28. doi:10.3847/1538-3881/153/1/28. Bibcode: 2017AJ....153...28S.
- ↑ 2.0 2.1 Esposito, M.; Covino, E.; Desidera, S.; Mancini, L.; Nascimbeni, V.; Zanmar Sanchez, R.; Biazzo, K.; Lanza, A. F. et al. (2017). "The GAPS Programme with HARPS-N at TNG. XIII. The orbital obliquity of three close-in massive planets hosted by dwarf K-type stars: WASP-43, HAT-P-20 and Qatar-2.". Astronomy & Astrophysics 601: A53. doi:10.1051/0004-6361/201629720. Bibcode: 2017A&A...601A..53E.
- ↑ Salz, M.; Schneider, P. C.; Czesla, S.; Schmitt, J. H. M. M. (2015). "High-energy irradiation and mass loss rates of hot Jupiters in the solar neighborhood". Astronomy & Astrophysics 576: A42. doi:10.1051/0004-6361/201425243. Bibcode: 2015A&A...576A..42S.
- ↑ 4.0 4.1 Bakos, G. Á.; Hartman, J.; Torres, G.; Latham, D. W.; Kovács, Géza; Noyes, R. W.; Fischer, D. A.; Johnson, J. A. et al. (2010). "HAT-P-20b–HAT-P-23b: FOUR MASSIVE TRANSITING EXTRASOLAR PLANETS". The Astrophysical Journal 742 (2): 116. doi:10.1088/0004-637X/742/2/116. Bibcode: 2011ApJ...742..116B.
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07h 27m 39.9487s, +24° 20′ 11.5183″
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