HAT-P-19

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.[3] The survey in 2012 have failed to find any stellar companions to HAT-P-19.[4]

HAT-P-19
Observation data
Epoch J2000      Equinox J2000
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]
Mass0.842±0.042 M☉
Radius0.820±0.048 R☉
Luminosity0.37+0.08
−0.06 L☉
Surface gravity (log g)4.47±0.05 cgs
Temperature5010±130 K
Metallicity0.23±0.08
Rotation14.66±0.03 d
Rotational velocity (v sin i)0.7±0.5 km/s
Age8.8±5.2 Gyr
Other designations
Gaia DR2 3654266795168165128, 2MASS J00380401+3442416[1]
Database references
SIMBADdata

Planetary system

In 2010 a transiting hot Saturn-sized planet was detected.[2] Its equilibrium temperature is 984±10 K,[5] and it is grey in color.[6]

The transit-timing variation measurements in 2015 and 2018 did not detect additional planets in the system.[7][8]

Size comparison of HAT-P-19 b and Jupiter
The HAT-P-19 planetary system[2][5]
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. HAT-P-19 -- Star
  2. Hartman, J. D.; Bakos, G. Á.; Sato, B.; Torres, G.; Noyes, R. W.; Latham, D. W.; Kovács, G.; Fischer, D. A.; Howard, A. W.; Johnson, J. A.; Marcy, G. W.; Buchhave, L. A.; Füresz, G.; Perumpilly, G.; Béky, B.; Stefanik, R. P.; Sasselov, D. D.; Esquerdo, G. A.; Everett, M.; Csubry, Z.; Lázár, J.; Papp, I.; Sári, P. (2010), "HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars", The Astrophysical Journal, 726: 52, arXiv:1007.4850, doi:10.1088/0004-637X/726/1/52, S2CID 10896305
  3. 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, arXiv:1305.0578, doi:10.1088/0004-637X/771/2/107, S2CID 119270620
  4. 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, arXiv:1202.4586, doi:10.1111/j.1365-2966.2012.20485.x, S2CID 118573795
  5. 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, arXiv:1911.07903, doi:10.1093/mnras/staa1758, S2CID 208158330
  6. Mallonn, M.; von Essen, C.; Weingrill, J.; Strassmeier, K. G.; Ribas, I.; Carroll, T. A.; Herrero, E.; Granzer, T.; Claret, A.; Schwope, A. (2015), "Transmission spectroscopy of the inflated exo-Saturn HAT-P-19b", Astronomy & Astrophysics, 580: A60, arXiv:1506.05685, doi:10.1051/0004-6361/201423778, S2CID 91175943
  7. Seeliger, M.; Kitze, M.; Errmann, R.; Richter, S.; Ohlert, J. M.; Chen, W. P.; Guo, J. K.; Göğüş, E.; Güver, T.; Aydın, B.; Mottola, S.; Hellmich, S.; Fernandez, M.; Aceituno, F. J.; Dimitrov, D.; Kjurkchieva, D.; Jensen, E.; Cohen, D.; Kundra, E.; Pribulla, T.; Vaňko, M.; Budaj, J.; Mallonn, M.; Wu, Z.-Y.; Zhou, X.; Raetz, St.; Adam, C.; Schmidt, T. O. B.; Ide, A.; 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, arXiv:1508.06215, doi:10.1093/mnras/stv1187, S2CID 56034663
  8. 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), arXiv:1808.03306, doi:10.22444/IBVS.6243, S2CID 118872603

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