WASP-4

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. Turner, Jake D.; Flagg, Laura; Ridden-Harper, Andrew; Jayawardhana, Ray (2022), "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", The Astronomical Journal, 163 (6): 281, arXiv:2112.09621, Bibcode:2022AJ....163..281T, doi:10.3847/1538-3881/ac686f, S2CID 245329747
  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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