HAT-P-13
In 2015, a spectroscopic study have revealed a very strong starspot activity of the HAT-P-13 star.
Planetary system
As of 2009, HAT-P-13 has been confirmed to have two extrasolar planets orbiting it. The inner planet was discovered by the "transit method" and the outer planet was found through the radial velocity method. A search for transits by HAT-P-13c was negative, however only 72% of the possible transit configurations could be ruled out. HAT-P-13 was the first star to have a transiting planet and an additional planet on a known orbit. HAT-P-7 and other planets are known to have additional companions, but there is not enough data to characterize the system. OGLE-TR-111 has one confirmed transiting planet, and one unconfirmed transiting planet.
The innermost planet, HAT-P-13b, has a mass around that of Jupiter and orbits its sun roughly every three days. This classifies the planet as a hot Jupiter, with temperatures exceeding 1000 kelvins. The second companion, HAT-P-13c, has a mass over 15 Jupiters. Because of its mass, this companion could either be a massive planet or a low mass brown dwarf. Either way, HAT-P-13 c orbits its sun every 446 days in a highly eccentric orbit. Radial velocity measurements also suggest the existence of a third more distant companion in the system. This may be an additional planet, or it may be a brown dwarf or even a small star.
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.906±0.024 MJ | 0.04313+0.00033 −0.00026 |
2.91624039±0.00000081 | 0.0093+0.0044 −0.0016 |
82.2+0.6 −0.8° |
1.487±0.038 RJ |
c | ≥14.28 ± 0.28 MJ | 1.188 −0.033 |
445.81±0.10 | 0.6616 ± 0.0054 | — | — |
See also
References
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