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. HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars, 2010, arXiv:1007.4850
  3. Spectroscopy of Faint Kepler Mission Exoplanet Candidate Host Stars, 2013, arXiv:1305.0578
  4. A lucky imaging multiplicity study of exoplanet host stars, 2012, arXiv:1202.4586
  5. A Holistic and Probabilistic Approach to the Ground-based Data of HAT-P-19 System, 2019, arXiv:1911.07903
  6. Transmission spectroscopy of the inflated exo-Saturn HAT-P-19b, 2015, arXiv:1506.05685
  7. Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems, 2015, arXiv:1508.06215
  8. NEW TRANSIT TIMING OBSERVATIONS FOR GJ 436 B, HAT-P-3 B, HAT-P-19 B, WASP-3 B, AND XO-2 B, 2018, arXiv:1808.03306

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