Kepler-16

Kepler-16 A/B

An artist's rendering of the Kepler-16 system, showing the binary star being orbited by Kepler-16b.
Credit: NASA/JPL-Caltech
Characteristics
Spectral type K / M[1]
Astrometry
Distance196 ly
(60 pc)
Orbit[2]
PrimaryKepler-16A
CompanionKepler-16B
Period (P)41.079220 (± 0.000078) d
Semi-major axis (a)0.22431 (± 0.00035) AU
Eccentricity (e)0.15944 (± 0.00062)
Inclination (i)90.30401 (± 0.0019)°
Longitude of the node (Ω)0°
Periastron epoch (T)BJD 2455212.12316
Argument of periastron (ω)
(secondary)		263.464 (± 0.027)°
Details
Kepler-16A
Mass0.6897 (± 0.0035) M☉
Radius0.6489 (± 0.0013) R☉
Luminosity0.148[3] L☉
Surface gravity (log g)4.6527 (± 0.0017) cgs
Temperature4450 (± 150) K
Metallicity [Fe/H]-0.3 (± 0.2) dex
Rotation35.1 ± 1.0 days[4]
Kepler-16B
Mass0.20255 (± 0.00065) M☉
Radius0.22623 (± 0.00059) R☉
Luminosity~0.0057[3] L☉
Surface gravity (log g)5.0358 (± 0.0017) cgs
Temperature~3311[3] K
Other designations
KIC 12644769[1][2] 2MASS 19161817+5145267[1]

Kepler-16 is a binary star system in the constellation of Cygnus[5] that was targeted by the Kepler spacecraft. Both stars are smaller than the Sun; the primary, Kepler-16A, is a K-type main-sequence star and the secondary, Kepler-16B, is an M-type red dwarf. They are separated by 0.22 AU, and complete an orbit around a common center of mass every 41 days.

The system is host to one known extrasolar planet in circumbinary orbit: the Saturn-sized Kepler-16b.

Planetary system

Main article: Kepler-16b

Kepler-16b is a gas giant that orbits the two stars in the Kepler-16 system.[2] The planet is a third of Jupiter's mass and slightly smaller than Saturn at 0.7538 Jupiter radii, but is more dense. Kepler-16b completes a nearly circular orbit every 228.776 days.

The Kepler-16 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.333 MJ 0.7048 228.776 0.0069 90.032° 0.7538 RJ

References

  1. 1 2 3 Jean Schneider (2011). "Notes for star Kepler-16 (AB)". Extrasolar Planets Encyclopaedia. Retrieved 23 September 2011.
  2. 1 2 3 Doyle, Laurance R.; Carter, Joshua A.; Fabrycky, Daniel C.; Slawson, Robert W.; Howell, Steve B.; Winn, Joshua N.; Orosz, Jerome A.; Prša, Andrej; Welsh, William F.; et al. (2011). "Kepler-16: A Transiting Circumbinary Planet". Science. 333 (6049): 1602–6. arXiv:1109.3432Freely accessible. Bibcode:2011Sci...333.1602D. doi:10.1126/science.1210923. PMID 21921192.
  3. 1 2 3 Haghighipour, Nader; Kaltenegger, Lisa (24 October 2013). "Calculating the Habitable Zone of Binary Star Systems. II. P-type Binaries". The Astrophysical Journal. 777 (2): 13. arXiv:1306.2890Freely accessible. Bibcode:2013ApJ...777..166H. doi:10.1088/0004-637X/777/2/166.
  4. ↑ Winn, Joshua N.; et al. (2011). "Spin-Orbit Alignment for the Circumbinary Planet Host Kepler-16 A". The Astrophysical Journal Letters. 741 (1). L1. arXiv:1109.3198Freely accessible. Bibcode:2011ApJ...741L...1W. doi:10.1088/2041-8205/741/1/L1.
  5. ↑ Drake, Nadia. "On Kepler-16b, shadows come in pairs". Science News. Society for Science & the Public. Retrieved 16 September 2011.
  6. ↑ Jean Schneider (2011). "Notes for Planet Kepler-16 (AB) b". Extrasolar Planets Encyclopaedia. Retrieved 23 September 2011.

Coordinates: 19h 16m 18.17s, +51° 45′ 26.78″

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