Astronomy:KELT-4Ab

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Short description: Hot Jupiter orbiting KELT-4A
KELT-4Ab
Discovery
Discovered byKELT-North
Discovery date2015[1]
Transit
Orbital characteristics
0.04321 ± 0.00085 AU (6,464,000 ± 127,000 km)[2]
Eccentricity0.03 ± 0.021[2]
Orbital period2.9895933 (± 4.9e-06)[2] d
Inclination83.11 ± 0.057[2]
StarKELT-4A
Physical characteristics
Mean radius1.706 ± 0.085[2] |♃|J}}}}}}
Mass0.878 ± 0.07[2] |♃|J}}}}}}


KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760 ly (230 pc) away[3] in the constellation of Leo.[4] The planet was discovered by the Kilodegree Extremely Little Telescope (KELT).

Characteristics

The exoplanet was discovered by transit and is a Hot Jupiter planet orbiting a star in a triple star system, KELT-4. It is the fourth planet found in such a system.[5] As KELT-4A is the brightest host (V~10) of a Hot Jupiter in a hierarchical triple stellar system found so far researchers expect it may be useful in learning more about inflated planets.[1][6]

Star system

KELT-4 is a triple star system. KELT-4BC is a binary star system subcomponent of the triple, 328 ± 16 astronomical unit|AU (4.91×1010 ± 2.4×109 km; 3.05×1010 ± 1.5×109 mi) away from KELT-4A and the projected separation between KELT-4B and KELT-4C is 10.30 ± 0.74 AU (1.541×109 ± 111,000,000 km; 957,000,000 ± 69,000,000 mi).[1]

See also

  • Gliese 667 Cc, a planet in a triple star system
  • KELT-2Ab, a previous planet discovered by the KELT survey, in a binary system
  • KELT

References

  1. ↑ 1.0 1.1 1.2 Eastman, Jason D. et al. (2016). "KELT-4Ab: An Inflated Hot Jupiter Transiting The Bright (V ~ 10) Component Of A Hiearchical Triple". The Astrophysical Journal 151 (2): 45. doi:10.3847/0004-6256/151/2/45. Bibcode: 2016AJ....151...45E. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "Planet KELT-4A b". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/catalog/kelt-4a_b/. Retrieved 2016-04-02. 
  3. ↑ Brown, A. G. A et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics 595: A2. doi:10.1051/0004-6361/201629512. Bibcode: 2016A&A...595A...2G. https://www.aanda.org/articles/aa/full_html/2016/11/aa29512-16/aa29512-16.html. Gaia Data Release 1 catalog entry
  4. ↑ "Planet KELT-4A b". Open Exoplanet Catalogue. http://www.openexoplanetcatalogue.com/planet/KELT-4A%20b/. 
  5. ↑ "Planet with triple-star system found". 1 April 2016. http://phys.org/news/2016-04-planet-triple-star.html. 
  6. ↑ Nola Taylor Redd (31 March 2016). "New Alien Planet Boasts Rare Triple Suns". http://www.scientificamerican.com/article/new-alien-planet-boasts-rare-triple-suns/. 

External links




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