HAT-P-12

HAT-P-12 is a magnitude 13 low-metallicity K dwarf star approximately 463 light years away in the constellation Canes Venatici.[3][2]

HAT-P-12
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici[1]
Right ascension 13h 57m 33.4669s[2]
Declination +43° 29′ 36.602″[2]
Apparent magnitude (V) 12.84
Characteristics
Spectral type K5[3]
Apparent magnitude (J) 10.794 ±0.023[4]
Apparent magnitude (H) 10.236 ±0.022[4]
Apparent magnitude (K) 10.108 ±0.016[4]
Variable type planetary transit[3]
Astrometry
Radial velocity (Rv)−40.4589±0.0023[5] km/s
Proper motion (μ) RA: −134.793(8) mas/yr[2]
Dec.: −44.229(11) mas/yr[2]
Parallax (π)7.0448 ± 0.0105 mas[2]
Distance463.0 ± 0.7 ly
(141.9 ± 0.2 pc)
Absolute magnitude (MV)12.35 ± 0.23
Details[6]
Mass0.719±0.016 M☉
Radius0.7084±0.0095 R☉
Luminosity0.21+0.02
−0.01[3] L☉
Surface gravity (log g)4.594±0.013 cgs
Temperature4710±49 K
Metallicity [Fe/H]−0.24+0.055
−0.062 dex
Rotation0.5 ± 0.4 kms−1[3]
Age2.5 ± 2.0[3] Gyr
Other designations
Gaia DR3 1499514786891168640, GSC 03033-00706, 2MASS J13573347+4329367, SDSS J135733.42+432936.5[4]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Planetary system

In 2009 an exoplanet, HAT-P-12b, was discovered by the HATNet Project orbiting this star. The planet was discovered using the transit method and confirmed by follow up radial velocity measurements.[3] Transit-timing variations suggest the possible presence of additional non-transiting planets in the system.[7]

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[8]

The HAT-P-12 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.211 ± 0.012 MJ 0.0384 ± 0.0003 3.2130598 ± 0.000006 0 — 0.95+2.85
−0.02 RJ
c[7] (unconfirmed) 0.218 MJ — 8.853 0.15499 73.5° —

See also

References
  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034.Vizier query form
  2. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  3. Hartman, J. D.; et al. (2009). "HAT-P-12b: A Low-density sub-Saturn mass planet transiting a metal-poor K dwarf". The Astrophysical Journal. 706 (1): 785–796. arXiv:0904.4704. Bibcode:2009ApJ...706..785H. doi:10.1088/0004-637X/706/1/785. S2CID 14540643.
  4. "HAT-P-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-19.
  5. Mancini, L.; et al. (2018). "The GAPS programme with HARPS-N at TNG. XVI. Measurement of the Rossiter-McLaughlin effect of transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39, and WASP-60". Astronomy and Astrophysics. 613. Table C.2. arXiv:1802.03859. Bibcode:2018A&A...613A..41M. doi:10.1051/0004-6361/201732234.
  6. 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.
  7. Sariya, Devesh P.; Jiang, Ing-Guey; Su, Li-Hsin; Yeh, Li-Chin; Chang, Tze-En; Moskvin, V. V.; Shlyapnikov, A. A.; Ignatov, V.; Mkrtichian, David; Griv, Evgeny; Mannaday, Vineet Kumar; Thakur, Parijat; Sahu, D. K.; Chand, Swadesh; Bisht, D.; Sun, Zhao; Ji, Jianghui (2021), "Non-sinusoidal transit timing variations for the exoplanet HAT-P-12b", Research in Astronomy and Astrophysics, 21 (4): 097, arXiv:2012.08820, doi:10.1088/1674-4527/21/4/97, S2CID 229188086
  8. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.

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