HAT-P-13

HAT-P-13, also known as GSC 03416-00543, is a G-type main sequence star approximately 811 light-years away in the constellation Ursa Major. In 2009 it was discovered that this star is orbited by two massive planets, the innermost of which transits the star. This was the first known example of an extrasolar transiting planet with an additional planet in the same system.[3]

HAT-P-13
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major[1]
Right ascension  08h 39m 31.8074s[2]
Declination +47° 21′ 07.276″[2]
Apparent magnitude (V) 10.62
Characteristics
Spectral type G4V[3]
Variable type Planetary transit variable[3]
Astrometry
Radial velocity (Rv)14.69 ± 0.68[3] km/s
Proper motion (μ) RA: −24.141±0.055[2] mas/yr
Dec.: −26.346±0.045[2] mas/yr
Parallax (π)4.0231 ± 0.0360[2] mas
Distance811 ± 7 ly
(249 ± 2 pc)
Details
Mass1.261+0.029
−0.023[4] M☉
Radius1.73+0.10
−0.09[4] R☉
Surface gravity (log g)4.13 ± 0.04[5] cgs
Temperature5720 ± 69[5] K
Metallicity [Fe/H]0.46 ± 0.07[5] dex
Rotational velocity (v sin i)3.1 ± 0.9[5] km/s
Age5 Gyr
Other designations
TYC 3416-543-1, GSC 03416-00543, 2MASS J08393180+4721073[6]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

In 2015, a spectroscopic study have revealed a very strong starspot activity of the HAT-P-13 star.[7]

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.[8] HAT-P-13 was the first star to have a transiting planet and an additional planet on a known orbit.[3] 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.[9]

The HAT-P-13 planetary system[3][9][10][4]
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+0.018
−0.033		 445.81±0.10 0.6616 ± 0.0054 — —
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See also

References
  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. Bakos, G. Á.; et al. (2009). "HAT-P-13b,c: A Transiting Hot Jupiter with a Massive Outer Companion on an Eccentric Orbit". The Astrophysical Journal. 707 (1): 446–456. arXiv:0907.3525. Bibcode:2009ApJ...707..446B. doi:10.1088/0004-637X/707/1/446.
  4. Hardy, Ryan A.; et al. (2017). "Secondary Eclipses of HAT-P-13b". The Astrophysical Journal. 836 (1). 143. arXiv:1701.00828. Bibcode:2017ApJ...836..143H. doi:10.3847/1538-4357/836/1/143.
  5. Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161.
  6. "HAT-P-13". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-27.
  7. FRIENDS OF HOT JUPITERS III:AN INFRARED SPECTROSCOPIC SEARCH FOR LOW-MASS STELLAR COMPANIONS, 2015, arXiv:1510.08062
  8. Szabó, Gy. M.; et al. (2010). "A multi-site campaign to detect the transit of the second planet in HAT-P-13". Astronomy and Astrophysics. 523. A84. arXiv:1009.3598. Bibcode:2010A&A...523A..84S. doi:10.1051/0004-6361/201015172.
  9. Winn, Joshua N.; et al. (2010). "The HAT-P-13 Exoplanetary System: Evidence for Spin-Orbit Alignment and a Third Companion". The Astrophysical Journal. 718 (1): 575–582. arXiv:1003.4512. Bibcode:2010ApJ...718..575W. doi:10.1088/0004-637X/718/1/575.
  10. Southworth, John; et al. (2012). "Refined physical properties of the HAT-P-13 planetary system". Monthly Notices of the Royal Astronomical Society. 420 (3): 2580–2587. arXiv:1111.5432. Bibcode:2012MNRAS.420.2580S. doi:10.1111/j.1365-2966.2011.20230.x.


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