KELT-4Ab

KELT-4Ab

Discovery
Discovered by	KELT-North
Discovery date	2015[1]
Detection method	Transit
Orbital characteristics
Semi-major axis	0.04321 ± 0.00085 AU (6,464,000 ± 127,000 km)[2]
Eccentricity	0.03 ± 0.021[2]
Orbital period (sidereal)	2.9895933 (± 4.9e-06)[2] d
Inclination	83.11 ± 0.057[2]
Star	KELT-4A
Physical characteristics
Mean radius	1.706 ± 0.085[2] RJ
Mass	0.878 ± 0.07[2] MJ

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 AU (4.91×10^10 ± 2.4×10^9 km; 3.05×10^10 ± 1.5×10^9 mi) away from KELT-4A and the projected separation between KELT-4B and KELT-4C is 10.30 ± 0.74 AU (1.541×10^9 ± 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): 45. arXiv:1510.00015. Bibcode:2016AJ....151...45E. doi:10.3847/0004-6256/151/2/45. S2CID 17613522.
2. "Planet KELT-4A b". 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. S2CID 1828208.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". Scientific American. Retrieved 2 April 2016.

External links

• KELT-North survey website Archived 2019-01-24 at the Wayback Machine
• Open Exoplanet Catalogue Entry