Astronomy:HAT-P-4

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Short description: Wide binary star system in the constellation Boötes
HAT-P-4
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Boötes[1]
HAT-P-4A
Right ascension  15h 19m 57.9204s[2]
Declination +36° 13′ 46.738″[2]
Apparent magnitude (V) 11.159±0.010[3]
HAT-P-4B
Right ascension  15h 20m 00.0127s[4]
Declination +36° 12′ 18.520″[4]
Apparent magnitude (V) 11.534±0.01[3]
Characteristics
HAT-P-4A
Spectral type G0V[5]
B−V color index 0.771
Variable type planetary transit[6]
HAT-P-4B
Spectral type G2V[5]
Astrometry
HAT-P-4A
Proper motion (μ) RA: −21.513(13)[2] mas/yr
Dec.: −24.255(19)[2] mas/yr
Parallax (π)3.1071 ± 0.0154[2] mas
Distance1,050 ± 5 ly
(322 ± 2 pc)
HAT-P-4B
Proper motion (μ) RA: −21.424(13) mas/yr
Dec.: −24.182(20) mas/yr
Parallax (π)3.0777 ± 0.0155[4] mas
Distance1,060 ± 5 ly
(325 ± 2 pc)
Details
HAT-P-4A
Mass1.260+0.043−0.042[7] M☉
Radius1.573±0.015[7] R☉
Luminosity0.41 L☉
Surface gravity (log g)4.145±0.015[7] cgs
Temperature5927+57−47[7] K
Metallicity [Fe/H]0.277±0.007[8] dex
Rotational velocity (v sin i)5.6 ± 0.9[9] km/s
Age~4.2 Gyr
HAT-P-4B
Surface gravity (log g)4.38±0.14[8] cgs
Temperature6037±37[8] K
Metallicity [Fe/H]0.175±0.006[8] 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
HAT-P-4A: BD36°2593, SAO 64638, TYC 2569-1599-1, GSC 02569-01599, 2MASS J15195792+3613467[10]
HAT-P-4B: TYC 2569-744-1, 2MASS J15200001+3612185[11]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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.

The star exhibits an infrared excess noise of unknown origin.[12]

Planetary System

The primary star is home to the transiting extrasolar planet HAT-P-4b.[6] This planet is a fairly typical hot Jupiter type planet in a 3-day orbit.[6]

Binary companion

The companion star is located at a distance of 28446 astronomical units and therefore has an orbital period that is extremely long.[5]

The HAT-P-4A planetary system[13][14]
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[7] RJ

See also

References

  1. ↑ 1.0 1.1 Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific 99 (617): 695–699. doi:10.1086/132034. Bibcode: 1987PASP...99..695R.  Vizier query form
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 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. ↑ 4.0 4.1 4.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 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. doi:10.1093/mnras/stu044. Bibcode: 2014MNRAS.439.1063M. 
  6. ↑ 6.0 6.1 6.2 Kovács, G. et al. (2007). "HAT-P-4b: A Metal-rich Low-Density Transiting Hot Jupiter". The Astrophysical Journal Letters 670 (1): L41–L44. doi:10.1086/524058. Bibcode: 2007ApJ...670L..41K. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. doi:10.3847/1538-4365/ac0835. Bibcode: 2021ApJS..255...15W. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1051/0004-6361/201731430. Bibcode: 2017A&A...604L...4S. https://www.aanda.org/articles/aa/full_html/2017/08/aa31430-17/aa31430-17.html. 
  9. ↑ Torres, Guillermo et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal 757 (2): 161. doi:10.1088/0004-637X/757/2/161. Bibcode: 2012ApJ...757..161T. 
  10. ↑ "BD+36 2593". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B36+2593. 
  11. ↑ "TYC 2569-744-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TYC+2569-744-1. 
  12. ↑ Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn et al. (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific 124 (913): 212–229, doi:10.1086/665043, Bibcode: 2012PASP..124..212S 
  13. ↑ 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. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. https://www.aanda.org/articles/aa/full_html/2017/06/aa29882-16/aa29882-16.html. 
  14. ↑ 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. doi:10.1086/665043. Bibcode: 2012PASP..124..212S. 

External links

Coordinates: Sky map 15h 19m 58s, +36° 13′ 47″




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