KELT-4Ab

KELT-4Ab
Exoplanet List of exoplanets
Parent star
Star KELT-4A
Right ascension (α) 10h 28m 15.011s
Declination (δ) +25° 34′ 23.5″
Distance685 ± 33[1] ly
(210 ± 10[1] pc)
Spectral type F
Orbital elements
Semi-major axis(a) 0.04321 ± 0.00085[2] AU
Eccentricity (e) 0.03 ± 0.021[2]
Orbital period(P) 2.9895933 (± 4.9e-06)[2] d
Inclination (i) 83.11 ± 0.057[2]°
Physical characteristics
Mass(m)0.878 ± 0.07[2] MJ
Radius(r)1.706 ± 0.085[2] RJ
Discovery information
Discovery date 2015[3]
Discoverer(s) KELT-North
Discovery method Transit
Discovery status Published

KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 685 ly (210 pc) away in the constellation of Leo.[1] The planet was discovered by the Kilodegree Extremely Little Telescope (KELT).

Planet

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.[4] 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.[3][5]

Star system

KELT-4 is a triple star system. KELT-4BC is a binary star system subcomponent of the triple, 328 ± 16 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).[3]

See also

References

  1. 1 2 3 "Planet KELT-4A b". Open Exoplanet Catalogue. Retrieved 2016-04-02.
  2. 1 2 3 4 5 6 "Planet KELT-4A b". The Extrasolar Planets Encyclopaedia. Retrieved 2016-04-02.
  3. 1 2 3 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). Bibcode:2016AJ....151...45E. arXiv:1510.00015 Freely accessible. doi:10.3847/0004-6256/151/2/45.
  4. ↑ Bob Yirka (1 April 2016). "Planet with triple-star system found". Phys.org. Retrieved 3 April 2016.
  5. ↑ Nola Taylor Redd (31 March 2016). "New Alien Planet Boasts Rare Triple Suns". Retrieved 2 April 2016.


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