Astronomy:HAT-P-19

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Short description: Star in the constellation Andromeda
HAT-P-19
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  00h 38m 04.0136s[1]
Declination +34° 42′ 41.5523″[1]
Apparent magnitude (V) 12.901[2]
Characteristics
Spectral type K1V
Astrometry
Radial velocity (Rv)-20.27 km/s
Proper motion (μ) RA: -26.775 mas/yr
Dec.: -32.478 mas/yr
Parallax (π)4.92 ± 0.0355[1] mas
Distance663 ± 5 ly
(203 ± 1 pc)
Details[3]
Mass0.863+0.029−0.025 M☉
Radius0.851±0.013 R☉
Luminosity0.37+0.08−0.06[4] L☉
Surface gravity (log g)4.514+0.019−0.017 cgs
Temperature5049+42−65 K
Metallicity0.283+0.081−0.079
Rotation14.66±0.03 d[4]
Rotational velocity (v sin i)0.7±0.5[4] km/s
Age8.8±5.2[4] Gyr
Other designations
Gaia DR2 3654266795168165128, 2MASS J00380401+3442416[1]
Database references
SIMBADdata

HAT-P-19 is a K-type main-sequence star about 650 light-years away. The star is old yet metal enriched, having amount of heavy elements 250% of solar abundance.[4] The survey in 2012 have failed to find any stellar companions to HAT-P-19.[5]

Planetary system

In 2010 a transiting hot Saturn-sized planet was detected.[2] Its equilibrium temperature is 984±10 K,[6] and it is grey in color.[7]

The transit-timing variation measurements in 2015 and 2018 did not detect additional planets in the system.[8][9]

Size comparison of HAT-P-19 b and Jupiter
The HAT-P-19 planetary system[2][6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.290±0.016 MJ 0.04649± 4.00878236+0.00000050−0.00000049 0.084±0.041 88.67+0.41−0.25° 1.089±0.018 RJ

References

  1. ↑ 1.0 1.1 1.2 1.3 HAT-P-19 -- Star
  2. ↑ 2.0 2.1 2.2 Hartman, J. D.; Bakos, G. Á.; Sato, B.; Torres, G.; Noyes, R. W.; Latham, D. W.; Kovács, G.; Fischer, D. A. et al. (2010), "HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars", The Astrophysical Journal 726: 52, doi:10.1088/0004-637X/726/1/52 
  3. ↑ Wang, Xian-Yu et al. (1 July 2021). "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves". The Astrophysical Journal Supplement Series 255 (1): 15. doi:10.3847/1538-4365/ac0835. Bibcode: 2021ApJS..255...15W. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Everett, Mark E.; Howell, Steve B.; Silva, David R.; Szkody, Paula (2013), "Spectroscopy of Faint Kepler Mission Exoplanet Candidate Host Stars", The Astrophysical Journal 771 (2): 107, doi:10.1088/0004-637X/771/2/107, Bibcode: 2013ApJ...771..107E 
  5. ↑ Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society 421 (3): 2498–2509, doi:10.1111/j.1365-2966.2012.20485.x, Bibcode: 2012MNRAS.421.2498G 
  6. ↑ 6.0 6.1 Basturk, Ozgur; Yalcinkaya, Selcuk; Esmer, Ekrem M.; Tanriverdi, Taner; Keten, Burak (2019), A Holistic and Probabilistic Approach to the Ground-based Data of HAT-P-19 System, doi:10.1093/mnras/staa1758 
  7. ↑ Mallonn, M.; von Essen, C.; Weingrill, J.; Strassmeier, K. G.; Ribas, I.; Carroll, T. A.; Herrero, E.; Granzer, T. et al. (2015), "Transmission spectroscopy of the inflated exo-Saturn HAT-P-19b", Astronomy & Astrophysics 580: A60, doi:10.1051/0004-6361/201423778, Bibcode: 2015A&A...580A..60M 
  8. ↑ Seeliger, M.; Kitze, M.; Errmann, R.; Richter, S.; Ohlert, J. M.; Chen, W. P.; Guo, J. K.; Göğüş, E. et al. (2015), "Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems", Monthly Notices of the Royal Astronomical Society 451 (4): 4060–4072, doi:10.1093/mnras/stv1187 
  9. ↑ MacIejewski, G.; Stangret, M.; Ohlert, J.; Basaran, Ç.S.; MacIejczak, J.; Puciata-Mroczynska, M.; Boulanger, E. (2018), "New transit timing observations for GJ 436 b, HAT-P-3 b, HAT-P-19 b, WASP-3 b, and XO-2 B", Information Bulletin on Variable Stars 6243 (6243): 1, doi:10.22444/IBVS.6243, Bibcode: 2018IBVS.6243....1M 

Coordinates: Sky map 00h 38m 04.0136s, +34° 42′ 41.5523″



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