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WASP-12

Coordinates: Sky map 06h 30m 32.794s, +29° 40′ 20.29″
From Wikipedia, the free encyclopedia
WASP-12

Keck Observatory image of WASP-12A (left) with WASP-12B and C (right, indicated)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Auriga[1]
Right ascension 06h 30m 32.7966s[2]
Declination +29° 40′ 20.264″[2]
Apparent magnitude (V) 11.560±0.068[3]
Characteristics
Spectral type G0V[4] + M3V + M3V[5]
Apparent magnitude (B) 12.138±0.019[3]
Apparent magnitude (R) ~11.6[6]
Apparent magnitude (J) 10.477±0.021[7]
Apparent magnitude (H) 10.228±0.022[7]
Apparent magnitude (K) 10.188±0.020[7]
Astrometry
Radial velocity (Rv)20.62±1.44[2] km/s
Proper motion (μ) RA: −1.519(19) mas/yr[2]
Dec.: −6.761(15) mas/yr[2]
Parallax (π)2.4213±0.0166 mas[2]
Distance1,347 ± 9 ly
(413 ± 3 pc)
Orbit[5]
PrimaryWASP-12 A
NameWASP-12 BC
Period (P)393.9 days
Semi-major axis (a)21±3 AU
Details
A
Mass1.325+0.026
−0.018[8] M☉
Radius1.690+0.019
−0.018[8] R☉
Luminosity4.05+0.54
−0.53[9] L☉
Surface gravity (log g)4.11±0.11[8] cgs
Temperature6265±50[8] K
Metallicity [Fe/H]+0.12±0.07[8] dex
Rotational velocity (v sin i)<1.9[8] km/s
Age3.05±0.32[8] Gyr
Details
B
Mass0.38±0.05[5] M☉
C
Mass0.37±0.05[5] M☉
Other designations
TOI-1725, TIC 86396382, TYC 1891-1178-1, 2MASS J06303279+2940202, UCAC2 42216354[6]
Database references
SIMBADA
BC
Exoplanet Archivedata

WASP-12 is a magnitude 11 yellow dwarf star located approximately 1347 light-years away[2] in the constellation Auriga.[6] 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.[5]

Planetary system

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

In 2008, the exoplanet WASP-12b was discovered orbiting WASP-12 by SuperWASP, using the transit method. It is a hot Jupiter completing an orbit around its star in just one day.[10] Its high carbon-to-oxygen ratio indicates that rocky planets might have formed in the star system, and it may be a carbon planet.[11] It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[12]

In 2015, no indications of additional planets were found in the WASP-12 system.[9]

The WASP-12 planetary system[13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b 1.465±0.079 MJ 0.0232±0.00064 1.09142030(14)[9] <0.02[14] 83.52±0.03 1.937±0.056 RJ

References

[edit]
  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 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. ↑ Bergfors, C.; Brandner, W.; Daemgen, S.; Biller, B.; Hippler, S.; Janson, M.; Kudryavtseva, N.; Geißler, K.; Henning, T.; Köhler, R. (2013). "Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts". Monthly Notices of the Royal Astronomical Society. 428 (1): 182. arXiv:1209.4087. Bibcode:2013MNRAS.428..182B. doi:10.1093/mnras/sts019.
  5. 1 2 3 4 5 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.
  6. 1 2 3 "SIMBAD query result: WASP-12 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24.
  7. 1 2 3 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331. Vizier catalog entry
  8. 1 2 3 4 5 6 7 Leonardi, P.; Nascimbeni, V.; et al. (June 2024). "TASTE. V. A new ground-based investigation of orbital decay in the ultra-hot Jupiter WASP-12b". Astronomy & Astrophysics. 686: A84. arXiv:2402.12120. Bibcode:2024A&A...686A..84L. doi:10.1051/0004-6361/202348363.
  9. 1 2 3 Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2017). "Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence of Additional Planets". The Astronomical Journal. 153 (2): 78. arXiv:1512.00464. Bibcode:2017AJ....153...78C. doi:10.3847/1538-3881/153/2/78.
  10. ↑ Hebb, L.; et al. (2009-03-10). "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.
  11. ↑ 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. S2CID 4415171..
  12. ↑ Ehrenreich, D.; Désert, J. -M. (2011). "Mass-loss rates for transiting exoplanets". Astronomy and Astrophysics. 529: A136. arXiv:1103.0011. Bibcode:2011A&A...529A.136E. doi:10.1051/0004-6361/201016356.
  13. ↑ Chakrabarty, Aritra; Sengupta, Sujan (July 2019). "Precise Photometric Transit Follow-up Observations of Five Close-in Exoplanets: Update on Their Physical Properties". The Astronomical Journal. 158 (1): 39. arXiv:1905.11258. Bibcode:2019AJ....158...39C. doi:10.3847/1538-3881/ab24dd.
  14. ↑ Bonomo, A. S.; Desidera, S.; et al. (June 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 & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
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