WASP-12

WASP-12 is a magnitude 11 yellow dwarf star located approximately 1410 light-years away in the constellation Auriga.[4] WASP-12 has a mass and radius similar to the Sun. Its planet WASP-12b has a retrograde orbit around WASP-12. Two red dwarf companions have been detected around WASP-12. Both have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.[6]

WASP-12
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Auriga[1]
Right ascension  06h 30m 32.7967s[2]
Declination +29° 40′ 20.2663″[2]
Apparent magnitude (V) 11.560±0.068[3]
Characteristics
Spectral type G0
Apparent magnitude (B) 12.138±0.019[3]
Apparent magnitude (R) ~11.6[4]
Apparent magnitude (J) 10.477±0.021[5]
Apparent magnitude (H) 10.228±0.022[5]
Apparent magnitude (K) 10.188±0.020[5]
Astrometry
Proper motion (μ) RA: −1.580±0.068[2] mas/yr
Dec.: −6.958±0.058[2] mas/yr
Parallax (π)2.3122 ± 0.0325[2] mas
Distance1,410 ± 20 ly
(432 ± 6 pc)
Details
Mass1.35 ± 0.14 M☉
Radius1.57 ± 0.07 R☉
Temperature6300 −100+200 K
Metallicity0.3 −0.15+0.05
Other designations
TYC 1891-1178-1, 2MASS J06303279+2940202, UCAC2 42216354, Gaia DR2 3435282862461427072[4]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Planetary system

In 2008, the extrasolar planet WASP-12b was discovered orbiting WASP-12 by the transit method.[7] Its high carbon-to-oxygen ratio indicates that rocky planets that might have formed in the star system; it may be a carbon planet.[8] It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[9]

No indications of other planets in system was found as in 2015.[10]

The WASP-12 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.41 ±0.1 MJ 0.0229 ±0.0008 1.091423 ± 3e-06 0.049 ±0.015 86.0 ± 3.0[11]° 1.736 ± 0.092[11] RJ
  • WASP-12b.
  • WASP-12b.
  • Artist's conception of WASP-12 & WASP-12b
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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
  4. "SIMBAD query result: WASP-12 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24.
  5. Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.Vizier catalog entry
  6. Bechter, Eric B.; Crepp, Justin R.; Ngo, Henry; Knutson, Heather A.; Batygin, Konstantin; Hinkley, Sasha; Muirhead, Philip S.; Johnson, John Asher; Howard, Andrew W.; Montet, Benjamin T.; Matthews, Christopher T.; Morton, Timothy D. (2014). "WASP-12b AND HAT-P-8b ARE MEMBERS OF TRIPLE STAR SYSTEMS". The Astrophysical Journal. 788 (1): 2. arXiv:1307.6857. Bibcode:2014ApJ...788....2B. doi:10.1088/0004-637X/788/1/2.
  7. Hebb; Collier-Cameron, A.; Loeillet, B.; Pollacco, D.; Hébrard, G.; Street, R. A.; Bouchy, F.; Stempels, H. C.; et al. (2009). "WASP-12b: THE HOTTEST TRANSITING EXTRASOLAR PLANET YET DISCOVERED". The Astrophysical Journal. 693 (2): 1920–1928. arXiv:0812.3240. Bibcode:2009ApJ...693.1920H. doi:10.1088/0004-637X/693/2/1920.
  8. Madhusudhan, Nikku; Harrington, Joseph; Stevenson, Kevin B.; Nymeyer, Sarah; Campo, Christopher J.; Wheatley, Peter J.; Deming, Drake; Blecic, Jasmina; et al. (December 8, 2010). "A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b". Nature. 469 (7328): 64–7. arXiv:1012.1603. Bibcode:2011Natur.469...64M. doi:10.1038/nature09602. PMID 21150901..
  9. D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011
  10. Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2015). "Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets". arXiv:1512.00464 [astro-ph.EP].
  11. Staff (2015). "Planet WASP-12 b". exoplanet.eu. Retrieved 4 August 2017.

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