Kepler-34b - Misplaced Pages

(Redirected from Kepler-34(AB) b) Small circumbinary gas giant orbiting the Kepler-34 star system

Kepler-34b
Discovery
Discovery date	01-11-2012
Detection method	Transit (Kepler Mission)
Orbital characteristics
Epoch BJD 2454969.2000
Semi-major axis	1.0896 ± 0.0009 AU (163,000,000 ± 130,000 km)
Eccentricity	0.182 _−0.0020
Orbital period (sidereal)	288.822 _−0.081 d
Inclination	90.355 _−0.018
Longitude of ascending node	−1.74 _−0.16
Longitude of periastron	106.5 _−2.0
Star	Kepler-34
Physical characteristics
Mean radius	0.764 _−0.0014 `R`_J 8.56 `R`_🜨
Mass	0.220 _−0.010 `M`_J (69.9 `M`_E)
Mean density	0.613 _−0.041 g cm
Surface gravity	936 ₋₅₄ m/s²
Temperature	323

Kepler-34b (formally Kepler-34(AB)b) is a circumbinary planet announced with Kepler-35b. It is a small gas giant that orbits every ~288 days around two stars. Despite the planet's relatively long orbital period, its existence could be confirmed quickly due to transiting both of its host stars.

Kepler-34b was unlikely to form at its current orbit, and likely migrated early from its birth orbit beyond 1.5 AU away from its parent binary stars, suffering multiple giant impacts in the process. The eccentricity of its planetary orbit might have been acquired on the last stage of migration, due to interaction with the residual debris disk, or by ejection of a second planet.

References

Lines, S.; Leinhardt, Z. M.; Paardekooper, S.; Baruteau, C.; Thebault, P. (2014), "Forming Circumbinary Planets: N -Body Simulations of Kepler-34", The Astrophysical Journal, 782 (1): L11, arXiv:1402.0509, Bibcode:2014ApJ...782L..11L, doi:10.1088/2041-8205/782/1/L11, S2CID 119214559
Pierens, A.; Nelson, R. P. (2013), "Migration and gas accretion scenarios for the Kepler 16, 34, and 35 circumbinary planets", Astronomy & Astrophysics, 556: A134, arXiv:1307.0713, Bibcode:2013A&A...556A.134P, doi:10.1051/0004-6361/201321777, S2CID 118597351
Gong, Yan-Xiang; Ji, Jianghui (2017), "The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio", The Astronomical Journal, 154 (5): 179, arXiv:1709.04433, Bibcode:2017AJ....154..179G, doi:10.3847/1538-3881/aa8c7c, S2CID 119085156

Constellation of Cygnus

List of stars in Cygnus

Stars

Bayer	α (Deneb) β (Albireo) γ (Sadr) δ (Fawaris) ε (Aljanah) ζ η θ ι ι κ λ μ ν ξ o o ο π (Azelfafage) π ρ σ τ υ φ χ ψ ω ω P Q
Flamsteed	2 4 8 9 15 16 (c) 17 20 (d) 22 23 26 (e) 27 (b) 28 (b) 29 (b) 33 35 39 41 47 52 55 56 57 59 (f) 61 63 (f) 68 (A) 71 (g) 72 74 75
Variable	R T W X Y RW SS SU TT AZ BC BI CH KY V380 V389 V404 V476 V1027 V1057 V1143 V1191 V1334 V1489 V1500 V1668 V1794 V1974 V2214 V2513
HR	7633 7767 7912 8193
HD	185269 185435 187123 188753 190655 191806 197037
Gliese	777 806 1245
Kepler	2 3 5 6 11 15 16 17 18 22 23 27 28 29 31 32 33 34 35 36 39 40 41 42 43 44 45 47 51 56 61 63 64 (PH1) 66 67 68 69 70 78 80 84 86 (PH2) 87 89 107 167 182 186 223 289 371 385 411 419 432 445 451 452 560 737 1229 1520 1625 1649 1708
WR	133 134 135 136 137 138a 140 142 147 148 150
Other	AFGL 2591 BD+40° 4210 BD+43 3654 Cygnus OB2 #8A Cygnus OB2 #12 Cygnus X-1 Cygnus X-3 G79.29+0.46 G 208-44 G 208-45 GSC 03949-00967 HAT-P-17 KELT-9 KELT-20 KIC 8462852 KIC 9832227 KIC 9970396 KIC 11026764 KIC 11145123 KOI-5 KOI-74 KOI-81 KOI-256 MWC 349 N6946-BH1 PSR J2032+4127 SPECULOOS-3 W75N(B)-VLA2 WASP-48 WISE J2000+3629 Wolf 1069

Star
clusters

Association	Cygnus OB2 Cygnus OB7 Cygnus OB9
Open	Berkeley 86 DR 6 IC 5146 Messier 29 Messier 39 NGC 6811 NGC 6819 NGC 6834 NGC 6866 NGC 6871 NGC 6910

Molecular
clouds

Cygnus X (including DR 21)

Nebulae

Dark	Barnard 146 Barnard 147 IC 5146 L1014
H II	NGC 6914 North America Nebula Pelican Nebula Sadr Region Sh2-101 Sh2-106
Planetary	Abell 78 Egg Nebula IRAS 19475+3119 IRAS 20324+4057 Kronberger 61 M1-92 NGC 6826 NGC 6881 NGC 6884 NGC 7008 NGC 7026 NGC 7027 NGC 7048 Soap Bubble Nebula
WR	Crescent Nebula
SNR	Cygnus Loop (including Veil Nebula)

Galaxies

NGC	6801 6946 7013
Other	3C 438 4C +48.48 Cygnus A ZTF J203349.8+322901.1

Exoplanets

Kepler	2b 3b 3c 5b 6b 11b 15b 16b 17b 22b 23b 28b 32b 33b 34b 36b 39b 40b 41b 47b 56b 61b 64b (PH1b) 68b 69b 70b 78b 87c 186b e f 371b c 409b 419b 432b 451b 452b 560b 737b 1229b 1520b 1625b 1652b 1658b 1649b c 1708b
Other	b Cygni b HD 185269 b HD 187123 b c HD 191806 b KELT-9b KELT-20b TrES-5b

Exomoons

Kepler	1625b I 1708b I

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