Astronomy:WASP-12

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Short description: Star in the constellation Auriga
WASP-12
Observation data
Equinox J2000.0]] (ICRS)
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 G0V or F[citation needed]
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
Mass1.434+0.11
−0.09[6] M☉
Radius1.657+0.046
−0.044[6] R☉
Luminosity4.05+0.54
−0.53[6] L☉
Temperature6360+130
−140[6] K
Metallicity+0.33+0.14
−0.17[6]
Other designations
TYC 1891-1178-1, 2MASS J06303279+2940202, UCAC2 42216354, Gaia DR2 3435282862461427072[4]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

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 and is known for being orbited by a planet that is extremely hot and has a retrograde orbit around WASP-12. WASP-12 forms a triple star system with two red dwarf companions. Both of them have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.[7]

Planetary system

In 2008, the extrasolar planet WASP-12b was discovered orbiting WASP-12 by the transit method.[8] Its high carbon-to-oxygen ratio indicates that rocky planets might have formed in the star system, and it may be a carbon planet.[9] It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[10]

In 2015, no indications of additional planets were found in the WASP-12 system.[6]

  • WASP-12b.

  • WASP-12b.

  • Artist's conception of WASP-12 & WASP-12b

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±0.000003 0.049±0.015 86.0±3.0[11]° 1.736±0.092[11] 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. doi:10.1086/132034. Bibcode: 1987PASP...99..695R.  Vizier query form
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 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
  4. ↑ 4.0 4.1 4.2 "SIMBAD query result: WASP-12 -- Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WASP-12. 
  5. ↑ 5.0 5.1 5.2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S.  Vizier catalog entry
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2015). "TRANSIT TIMING VARIATION MEASUREMENTS OF WASP-12b AND QATAR-1b: NO EVIDENCE OF ADDITIONAL PLANETS". The Astronomical Journal 153 (2): 78. doi:10.3847/1538-3881/153/2/78. 
  7. ↑ Bechter, Eric B.; Crepp, Justin R.; Ngo, Henry; Knutson, Heather A.; Batygin, Konstantin; Hinkley, Sasha; Muirhead, Philip S.; Johnson, John Asher et al. (2014). "WASP-12b AND HAT-P-8b ARE MEMBERS OF TRIPLE STAR SYSTEMS". The Astrophysical Journal 788 (1): 2. doi:10.1088/0004-637X/788/1/2. Bibcode: 2014ApJ...788....2B. 
  8. ↑ 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. doi:10.1088/0004-637X/693/2/1920. Bibcode: 2009ApJ...693.1920H. 
  9. ↑ 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. doi:10.1038/nature09602. PMID 21150901. Bibcode: 2011Natur.469...64M. .
  10. ↑ D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011
  11. ↑ 11.0 11.1 Staff (2015). "Planet WASP-12 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/wasp_12_b--459/. 

External links

Coordinates: Sky map 06h 30m 32.794s, +29° 40′ 20.29″



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