HAT-P-4

HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars[5] in the constellation of Boötes.[1] It is also designated BD+36°2593.

HAT-P-4
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes[1]
HAT-P-4A
Right ascension 15h 19m 57.9205s[2]
Declination +36° 13′ 46.7380″[2]
Apparent magnitude (V) 11.159±0.010[3]
HAT-P-4B
Right ascension 15h 20m 00.0129s[4]
Declination +36° 12′ 18.5209″[4]
Apparent magnitude (V) 11.534±0.01[3]
Characteristics
Spectral type G0V/G2V[5]
B−V color index 0.771
Astrometry
HAT-P-4A
Proper motion (μ) RA: −21.661±0.035[2] mas/yr
Dec.: −24.250±0.058[2] mas/yr
Parallax (π)3.0919 ± 0.0273 mas[2]
Distance1,055 ± 9 ly
(323 ± 3 pc)
HAT-P-4B
Proper motion (μ) RA: −21.536±0.032[4] mas/yr
Dec.: −24.229±0.056[4] mas/yr
Parallax (π)3.0739 ± 0.0272 mas[4]
Distance1,061 ± 9 ly
(325 ± 3 pc)
Details
HAT-P-4A
Mass1.260+0.043
−0.042[6] M☉
Radius1.573±0.015[6] R☉
Luminosity0.41 L☉
Surface gravity (log g)4.145±0.015[6] cgs
Temperature5927+57
−47[6] K
Metallicity [Fe/H]0.277±0.007[7] dex
Rotational velocity (v sin i)5.6 ± 0.9[8] km/s
Age~4.2 Gyr
HAT-P-4B
Surface gravity (log g)4.38±0.14[7] cgs
Temperature6037±37[7] K
Metallicity [Fe/H]0.175±0.006[7] dex
Position (relative to HAT-P-4A)[5]
ComponentHAT-P-4B
Epoch of observation1999/02/07
Angular distance91.760±0.099″
Position angle163.97±0.06°
Observed separation
(projected)		28446 AU
Other designations
BD+36°2593, SAO 64638, AG+36° 1339, GSC 02569-01599, PPM 78511, TYC 2569-1599-1, 2MASS J15195792+3613467
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

The star exhibits an infrared excess noise of unknown origin.[9]

Planetary System

The primary star is home to the transiting extrasolar planet HAT-P-4b.[10]

The HAT-P-4A planetary system[11][12]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.651+0.033
−0.037 MJ		 0.04449+0.00083
−0.0012		 3.0565254±0.0000012 <0.0073 — 1.28+0.016
−0.015[6] RJ

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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry for component A Vizier catalog entry for component B
  4. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  5. Mugrauer, M.; Ginski, C.; Seeliger, M. (2014). "New wide stellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 439 (1): 1063–1070. Bibcode:2014MNRAS.439.1063M. doi:10.1093/mnras/stu044.
  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.
  7. Saffe, C.; et al. (2017). "Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies". Astronomy and Astrophysics Letters. 604. L4. arXiv:1707.02180. Bibcode:2017A&A...604L...4S. doi:10.1051/0004-6361/201731430. S2CID 119204481.
  8. Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
  9. Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn; Bays, Kevin; Lunsford, Allen; o'Gorman, Eamon (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific, 124 (913): 212–229, arXiv:1202.2799, doi:10.1086/665043, S2CID 29665395
  10. Kovács, G.; et al. (2007). "HAT-P-4b: A Metal-rich Low-Density Transiting Hot Jupiter". The Astrophysical Journal Letters. 670 (1): L41–L44. arXiv:0710.0602. Bibcode:2007ApJ...670L..41K. doi:10.1086/524058. S2CID 14966730.
  11. Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
  12. Sada, Pedro V.; et al. (2012). "Extrasolar Planet Transits Observed at Kitt Peak National Observatory". Publications of the Astronomical Society of the Pacific. 124 (913): 212–229. arXiv:1202.2799. Bibcode:2012PASP..124..212S. doi:10.1086/665043. S2CID 29665395.


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