Kepler-1647b

Kepler-1647b
Exoplanet List of exoplanets
Parent star
Star Kepler-1647
Constellation Cygnus
Right ascension (α) 19h 52m 36.02s[1]
Declination (δ) +40° 39′ 22.2″
Apparent magnitude (mV) ~13.54 (estimated)
Distance3700 ly
(1134 pc)
Mass (m) 1.22[1] M☉
Radius (r) 1.79[1] R☉
Temperature (T) 6210 K
Metallicity [Fe/H] -0.14±0.05
Age 4.4 Gyr
Physical characteristics
Mass(m)1.52±0.65 MJ
Radius(r)1.06±0.0123 RJ
Orbital elements
Semi-major axis(a) 2.7205±0.007[1] AU
Eccentricity (e) 0.0581[1]
Orbital period(P) 1107.6±0.023[1] d
Inclination (i) ~90.1[1]°
Discovery information
Discovery date June 13, 2016
Discoverer(s)
Discovery method Transit
Discovery site Kepler Space Observatory
Discovery status
Other designations
WISE J195236.01+403921.8 b; 2MASS J19523602+4039222 b; KIC 5473556 b; Kepler-1647(AB)-b

Kepler-1647b (sometimes named Kepler-1647(AB)-b to distinguish it from the secondary component) is a circumbinary exoplanet that orbits the binary star system Kepler-1647, 3,700 light-years (1,100 pc) from Earth in the constellation Cygnus.[2] It was announced on June 13, 2016 in San Diego at a meeting of the American Astronomical Society.[2] It was detected using the transit method, when it caused the dimming of the primary star, and then again of the secondary star blended with the primary star eclipse.[3] The first transit of the planet was identified in 2012, but at the time the single event was not enough to rule out contamination, or confirm it as a planet.[3] It was discovered by the analysis of the Kepler light-curve, which showed the planet in transit.

Characteristics

Mass and orbit

The exoplanet is a gas giant, similar in size to Jupiter, and has an orbital period of 1107 days.[3] This is the longest transit period of any confirmed transiting Kepler exoplanet discovered yet.[2] It is also the largest circumbinary Kepler planet known.[3] It is 483±206 times more massive than earth, and 1.52±0.65 times Jupiter's mass.[1]

Host stars

The star system, Kepler-1647 (also known as 2MASS J19523602+4039222, KOI-2939, and KIC 5473556), is a binary star with the primary star (Kepler-1647 A) having a mass of 1.22 M☉, a radius of 1.79 R☉, and a surface temperature of 6210 ± 100 K. The secondary star (Kepler-1647 B), on the other hand, has a mass of 0.975 M☉, a radius of 1.79 R☉, and a surface temperature of 5770 K. In comparison, the Sun has a surface temperature of 5778 K.[4] The binary star system's age is estimated to be about 4.4 billion years old, about 200 million years younger than the Sun.

Habitability

Kepler-1647b is in the habitable zone of the star system.[2][3] Since the planet is a gas giant, it is unlikely to host life. However, hypothetical large moons could potentially be suitable for life.[2][3] However, large moons are usually not created during accretion near a gas giant. Such moons would likely have to be captured separately, e.g., a passing protoplanet caught into orbit due to the gravitational field of the giant planet.

See also

References

  1. 1 2 3 4 5 6 7 8 "Kepler-1647b – NASA Exoplanet Archive". Retrieved June 14, 2016.
  2. 1 2 3 4 5 "New Planet Is Largest Discovered That Orbits Two Suns". NASA. June 13, 2016. Retrieved June 14, 2016.
  3. 1 2 3 4 5 6 Kostov, Veselin B.; Orosz, Jerome A.; Welsh, William F.; Doyle, Laurance R.; Fabrycky, Daniel C.; Haghighipour, Nader; Quarles, Billy; Short, Donald R.; Cochran, William D.; Endl, Michael; Ford, Eric B.; Gregorio, Joao; Hinse, Tobias C.; Isaacson, Howard; Jenkins, Jon M.; Jensen, Eric L. N.; Kane, Stephen; Kull, Ilya; Latham, David W.; Lissauer, Jack J.; Marcy, Geoffrey W.; Mazeh, Tsevi; Muller, Tobias W. A.; Pepper, Joshua; Quinn, Samuel N.; Ragozzine, Darin; Shporer, Avi; Steffen, Jason H.; Torres, Guillermo; et al. (2015). "Kepler-1647b: the largest and longest-period Kepler transiting circumbinary planet". The Astrophysical Journal. 827: 86. arXiv:1512.00189 [astro-ph.EP]. Bibcode:2016ApJ...827...86K. doi:10.3847/0004-637X/827/1/86. Cite uses deprecated parameter |class= (help)
  4. ↑ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.

Coordinates: 19h 42m 36.02s, +40° 32′ 22.2″

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