HAT-P-16

HAT-P-16 is a F-type main-sequence star about 740 light-years away. The star has a concentration of heavy elements slightly higher than solar abundance,[2] and low starspot activity.[4] The survey in 2015 have failed to find any stellar companions to it.[5] The spectral analysis in 2014 have discovered the HAT-P-16 has a carbon to oxygen molar ratio of 0.58±0.08, close to Sun`s value of 0.55.[6]

HAT-P-16
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 38m 17.5584s[1]
Declination +42° 27′ 47.2169″[1]
Apparent magnitude (V) 10.91
Characteristics
Spectral type F8V
Astrometry
Radial velocity (Rv)-15.51 km/s
Proper motion (μ) RA: -21.564 mas/yr
Dec.: -4.588 mas/yr
Parallax (π)4.3859 ± 0.0847[1] mas
Distance740 ± 10 ly
(228 ± 4 pc)
Details[2][3]
Mass1.218±0.039 M☉
Radius1.237±0.054 R☉
Luminosity1.97±0.22 L☉
Surface gravity (log g)4.34±0.03 cgs
Temperature6140±72 K
Metallicity0.12±0.08
Rotational velocity (v sin i)3.5±0.5 km/s
Age2.0±0.8 Gyr
Other designations
Gaia DR2 3815923136483872000, TYC 2792-1700-1, GSC 02792-01700, 2MASS J00381756+4227470[1]
Database references
SIMBADdata


Planetary system

In 2010 a transiting hot superjovian planet was detected.[2] Transit-timing variation analysis in 2016 have failed to detect an additional planets in the system.[7]

In 2011 the observation utilizing a Rossiter–McLaughlin effect was performed, and the orbit of HAT-P-16b was found to be probably aligned with the equatorial plane of the star, misalignment angle equal to 10±16°.[8]

The planet HAT-P-16b equilibrium temperature was found to be equal to 1567±22 K in 2013.[3] The multiband photometry have failed to find any Rayleigh scattering in the HAT-P-16b atmosphere, which may indicate a presence of hazes or dense cloud deck.[9]

Size comparison of HAT-P-16 b and Jupiter
The HAT-P-16 planetary system[2][10][3][7][11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 4.221±0.092 MJ 0.04134+0.00044
−0.00045		 2.7759704±0.0000007 0.0462+0.0027
−0.0024		 86.6±0.7° 1.190±0.037 RJ

References
  1. HAT-P-16 -- Star
  2. HAT-P-16b: A 4 MJ PLANET TRANSITING A BRIGHT STAR ON AN ECCENTRIC ORBIT, 2010, arXiv:1005.2009
  3. Ciceri, S.; Mancini, L.; Southworth, J.; Nikolov, N.; Bozza, V.; Bruni, I.; Calchi Novati, S.; d'Ago, G.; Henning, Th. (2013). "Simultaneous follow-up of planetary transits: Revised physical properties for the planetary systems HAT-P-16 and WASP-21". Astronomy & Astrophysics. 557: A30. arXiv:1307.5874. Bibcode:2013A&A...557A..30C. doi:10.1051/0004-6361/201321669.
  4. An Ultraviolet Investigation of Activity on Exoplanet Host Stars, 2013, arXiv:1301.6192
  5. FRIENDS OF HOT JUPITERS III:AN INFRARED SPECTROSCOPIC SEARCH FOR LOW-MASS STELLAR COMPANIONS, 2015, arXiv:1510.08062
  6. C/O Ratios of Stars with Transiting Hot Jupiter Exoplanets, 2014, arXiv:1403.6891
  7. EXOPLANET TRANSITS REGISTERED AT THE UNIVERSIDAD DE MONTERREY OBSERVATORY. PART I: HAT-P-12b, HAT-P-13b, HAT-P-16b, HAT-P-23b AND WASP-10b, 2016, arXiv:1601.02292
  8. Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9 HAT-P-16, and HAT-P-23, 2011, arXiv:1105.3849
  9. Photometric observation of HAT-P-16b in the near-UV, 2013, arXiv:1310.5397
  10. {{citation|arxiv=1202.6379|title=Observational constraints on tidal effects using orbital eccentricities|year=2012
  11. The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets, 2017, arXiv:1704.00373

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