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]
| 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 |
| Distance | 1,410 ± 20 ly (432 ± 6 pc) |
| Details | |
| Mass | 1.35 ± 0.14 M☉ |
| Radius | 1.57 ± 0.07 R☉ |
| Temperature | 6300 −100+200 K |
| Metallicity | 0.3 −0.15+0.05 |
| Other designations | |
2MASS J06303279+2940202, UCAC2 42216354[4] | |
| Database references | |
| SIMBAD | data |
| 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]
| 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..jpg)
Artist's conception of WASP-12 & WASP-12b
See also
References
- 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
- 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.
- 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
- "SIMBAD query result: WASP-12 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24.
- 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
- 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.
- 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.
- 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..
- D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011
- 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].
- Staff (2015). "Planet WASP-12 b". exoplanet.eu. Retrieved 4 August 2017.
External links
- WASP-12b in transit (lightcurve)
- "WASP-12". Exoplanets. Retrieved 2009-05-06.
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