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WASP-4 is a G-type main sequence star approximately 891 light-years away in the constellation of Phoenix.[4][1][2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on close orbit.[6]

WASP-4

Artistic rendering of WASP-4 b
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Phoenix[1]
Right ascension 23h 34m 15.0857s[2]
Declination −42° 03′ 41.048″[2]
Apparent magnitude (V) 12.468±0.025[3]
Characteristics
Spectral type G7V[4]
Apparent magnitude (V) 12.468±0.025[3]
Apparent magnitude (B) 13.216±0.020[3]
Variable type Planetary transit variable[4]
Astrometry
Proper motion (μ) RA: 9.950(12)[2] mas/yr
Dec.: −87.620(10)[2] mas/yr
Parallax (π)3.6623 ± 0.0147 mas[2]
Distance891 ± 4 ly
(273 ± 1 pc)
Details[5][6]
Mass0.89±0.01 M☉
Radius0.915+0.03
−0.043[7] R☉
Surface gravity (log g)4.484+0.037
−0.047[7] cgs
Temperature5436±34 K
Metallicity [Fe/H]0.019±0.04 dex
Rotation22.20±3.30 d
Age6.27±2.34 Gyr
Other designations
1SWASP J233415.06-420341.1, Gaia DR2 6535499658122055552, TYC 8017-108-1, 2MASS J23341508-4203411[8]
Database references
SIMBADdata

Planetary system


In 2007 the extrasolar planet WASP-4b was discovered orbiting this star. With an orbital period of just 1.3 days it is classified as a hot Jupiter.[4] The planetary orbit is subject to rapid decay, with decay timescale of 15.77±1.57 million years. Another superjovian planet in the system is suspected.[9]

The WASP-4 planetary system[5][10][7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.216±0.013 MJ 0.0228±0.00013 1.338231587±0.000000022[9] 0 (assumed) 87.63+0.32
−0.28°		 1.33±0.16 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) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 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
  4. Wilson, D. M.; et al. (2008). "WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere". The Astrophysical Journal Letters. 675 (2): L113–L116. arXiv:0801.1509. Bibcode:2008ApJ...675L.113W. doi:10.1086/586735. S2CID 10823235.
  5. Petrucci, R.; et al. (2013). "No Transit Timing Variations in Wasp-4". The Astrophysical Journal Letters. 779 (2). L23. arXiv:1311.2048. Bibcode:2013ApJ...779L..23P. doi:10.1088/2041-8205/779/2/L23. S2CID 118376692.
  6. Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics, 577: A90, arXiv:1503.09111, Bibcode:2015A&A...577A..90M, doi:10.1051/0004-6361/201525774, S2CID 53324330
  7. Dragomir, Diana; Kane, Stephen R.; Pilyavsky, Genady; Mahadevan, Suvrath; Ciardi, David R.; Zachary Gazak, J.; Gelino, Dawn M.; Payne, Alan; Rabus, Markus; Ramirez, Solange V.; von Braun, Kaspar; Wright, Jason T.; Wyatt, Pamela (2011). "Terms Photometry of Known Transiting Exoplanets". The Astronomical Journal. 142 (4): 115. arXiv:1108.2308. Bibcode:2011AJ....142..115D. doi:10.1088/0004-6256/142/4/115. S2CID 118606598.
  8. "WASP-4". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-09-22.
  9. Characterizing the WASP-4 system with TESS and radial velocity data: Constraints on the cause of the hot Jupiter’s changing orbit and evidence of an outer planet, 2021, arXiv:2112.09621
  10. Huitson, C. M.; et al. (2017). "Gemini/GMOS Transmission Spectral Survey: Complete Optical Transmission Spectrum of the Hot Jupiter WASP-4b". The Astronomical Journal. 154 (3). 95. arXiv:1707.06575. Bibcode:2017AJ....154...95H. doi:10.3847/1538-3881/aa7f72. S2CID 119415111.


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На других языках

[de] WASP-4

WASP-4 ist der Name eines von der Sonne 260,5 Parsec (ca. 850 Lichtjahre) entfernten Sternes, der von einem Exoplaneten umkreist wird. Der im Sternbild Phönix befindliche Stern ist vom Spektraltyp G7V und hat die scheinbare Helligkeit 12,6. Mit einer Oberflächentemperatur von ca. 5600 K ist der Stern der Sonne ähnlich.
- [en] WASP-4

[ru] WASP-4

WASP-4 — звезда в созвездии Феникса на расстоянии приблизительно 851 светового года от нас. Это жёлтый карлик класса G главной последовательности. Звезда немного легче и холоднее Солнца. Она имеет планету класса так называемых горячих юпитеров.


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