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.[4] The survey in 2012 have failed to find any stellar companions to HAT-P-19.[5]

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 mas[1]
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

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. 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. 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. arXiv:2105.14851. Bibcode:2021ApJS..255...15W. doi:10.3847/1538-4365/ac0835. S2CID 235253975.
  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, arXiv:1305.0578, Bibcode:2013ApJ...771..107E, doi:10.1088/0004-637X/771/2/107, S2CID 119270620
  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, arXiv:1202.4586, Bibcode:2012MNRAS.421.2498G, doi:10.1111/j.1365-2966.2012.20485.x, S2CID 118573795
  6. 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
  7. 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, Bibcode:2015A&A...580A..60M, doi:10.1051/0004-6361/201423778, S2CID 91175943
  8. 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
  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, arXiv:1808.03306, Bibcode:2018IBVS.6243....1M, doi:10.22444/IBVS.6243, S2CID 118872603
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