KELT-4Ab

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).

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]
2.9895933 (± 4.9e-06)[2] d
Inclination83.11 ± 0.057[2]
StarKELT-4A
Physical characteristics
Mean radius
1.706 ± 0.085[2] RJ
Mass0.878 ± 0.07[2] MJ

    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.[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 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. 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). arXiv:1510.00015. Bibcode:2016AJ....151...45E. doi:10.3847/0004-6256/151/2/45.
    2. "Planet KELT-4A b". The Extrasolar Planets Encyclopaedia. Archived from the original on 2016-04-16. 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. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
    4. "Planet KELT-4A b". Open Exoplanet Catalogue. Retrieved 2016-04-02.
    5. Bob Yirka (1 April 2016). "Planet with triple-star system found". Phys.org. Retrieved 3 April 2016.
    6. Nola Taylor Redd (31 March 2016). "New Alien Planet Boasts Rare Triple Suns". Retrieved 2 April 2016.


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