Astronomy:KELT-2Ab
 | |
| Discovery | |
|---|---|
| Discovered by | KELT-North |
| Discovery date | 7 June 2012 |
| Transit | |
| Orbital characteristics | |
| 0.5504 ± 0.00086 AU (82,339,000 ± 129,000 km) | |
| Eccentricity | 0 |
| Orbital period | 4.1137913 ± 0.00001 d |
| Inclination | 88.56 ± 1.14 |
| astron|astron|helion}} | 2455974.60338 ± 0.00083 |
| 90 | |
| Semi-amplitude | 161.1 ± 7.8 |
| Star | KELT-2A |
| Physical characteristics | |
| Mean radius | 1.290 ± 0.057[1] |♃|J}}}}}} |
| Mass | 1.524 ± 0.088[1] |♃|J}}}}}} |
| Mean density | 940 ± 90 kg/m3 (1,580 ± 150 lb/cu yd)[1] |
| 22.7 m/s2 (74 ft/s2) 2.3 g | |
| Physics | 1994±104 K or 1782±111 K[2] |
KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 440 light-years away in the constellation of Auriga.[1] It was discovered by the KELT-North survey via the transit method, so both its mass and radius are known quite precisely. As of its discovery KELT-2Ab is the fifth-brightest transiting Hot Jupiter known that has a well constrained mass. This makes the KELT-2A system a promising target for future space- and ground-based follow-up observations to learn about the planet's atmosphere.[3]
The water vapour was detected in planetary atmosphere in 2018.[4]
The star KELT-2A is a member of the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 astronomical units away.
See also
References
- ↑ 1.0 1.1 1.2 1.3 Beatty, Thomas G. et al. (2012). "KELT-2Ab: A Hot Jupiter Transiting the Bright (V = 8.77) Primary Star of a Binary System". The Astrophysical Journal Letters 756 (2): L39. doi:10.1088/2041-8205/756/2/L39. Bibcode: 2012ApJ...756L..39B.
- ↑ Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie et al. (2019), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal 159 (4): 137, doi:10.3847/1538-3881/ab6cff, Bibcode: 2020AJ....159..137G
- ↑ The MgI line: a new probe of the atmospheres of evaporating exoplanets
- ↑ Piskorz, Danielle; Buzard, Cam; Line, Michael R.; Knutson, Heather A.; Benneke, Björn; Crockett, Nathan R.; Lockwood, Alexandra C.; Blake, Geoffrey A. et al. (2018), "Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab", The Astronomical Journal 156 (3): 133, doi:10.3847/1538-3881/aad781, Bibcode: 2018AJ....156..133P
External links
- KELT-North survey website
- "Planet KELT-2A b". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/catalog/kelt-2a_b/. Retrieved 2012-07-30.
- KELT-2Ab discovery lightcurve, with music
Coordinates: 
06h 10m 39s, +30° 57′ 25″
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