Kepler-296

Kepler-296 is a binary star system^[3] in the constellation Draco. The primary star appears to be a late K-type main-sequence star, while the secondary is a red dwarf.^[2]

Kepler-296

Observation data Epoch J2000      Equinox J2000
Constellation	Draco
Right ascension	19h 06m 09.60253s[1]
Declination	+49° 26′ 14.3969″[1]
Characteristics
Spectral type	K7 V + M1 V[2]
Astrometry
Proper motion (μ)	RA: 2.635 mas/yr[1] Dec.: −16.375 mas/yr[1]
Parallax (π)	4.5538 ± 0.5562 mas[1]
Distance	approx. 720 ly (approx. 220 pc)
Details[3]
Kepler-296 A
Mass	0.498+0.067 −0.087 M☉
Radius	0.480+0.066 −0.087 R☉
Surface gravity (log g)	4.774+0.091 −0.059 cgs
Temperature	3740±130 K
Metallicity [Fe/H]	−0.08+0.28 −0.30 dex
Kepler-296 B
Mass	0.326+0.070 −0.079 M☉
Radius	0.322+0.060 −0.068 R☉
Surface gravity (log g)	4.993+0.087 −0.063 cgs
Temperature	3440±75 K
Metallicity [Fe/H]	−0.08+0.28 −0.30 dex
Other designations
Gaia DR2 2132069633148965888, KOI-1422, KIC 11497958, 2MASS J19060960+4926143[4]
Database references
SIMBAD	data
KIC	data

Planetary system

The following plot shows the approximate sizes of the planets in this system compared to planets in the Solar System.^[5]

Five exoplanets have been detected around the system; all are believed to be orbiting the primary star rather than its dimmer companion.^[3] Two planets in particular, Kepler-296e and Kepler-296f, are likely located in the habitable zone.^[3] For the planetary system to remain stable, no additional giant planets can be located up to orbital radius 10.1 AU.^[6]

The Kepler-296 planetary system^[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	—	0.079	10.864384	<0.33	—	1.61 R🜨
c	—	0.0521	5.8416366	<0.33	—	2.00 R🜨
d	—	0.118	19.850291	<0.33	—	2.09 R🜨
e	—	0.169	34.14211	<0.33	—	1.53 R🜨
f	—	0.255	63.33627	<0.33	—	1.80 R🜨

See also

• Habitability of red dwarf systems
• List of potentially habitable exoplanets

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Lissauer, Jack J; Marcy, Geoffrey W; Bryson, Stephen T; Rowe, Jason F; Jontof-Hutter, Daniel; Agol, Eric; Borucki, William J; Carter, Joshua A; Ford, Eric B; Gilliland, Ronald L; Kolbl, Rea; Star, Kimberly M; Steffen, Jason H; Torres, Guillermo (2014). "Validation Ofkepler's Multiple Planet Candidates. Ii. Refined Statistical Framework and Descriptions of Systems of Special Interest". The Astrophysical Journal. 784 (1): 44. arXiv:1402.6352. Bibcode:2014ApJ...784...44L. doi:10.1088/0004-637X/784/1/44. S2CID 119108651.
3. Barclay, Thomas; Quintana, Elisa V; Adams, Fred C; Ciardi, David R; Huber, Daniel; Foreman-Mackey, Daniel; Montet, Benjamin T; Caldwell, Douglas (2015). "The Five Planets in the Kepler-296 Binary System All Orbit the Primary: A Statistical and Analytical Analysis". The Astrophysical Journal. 809 (1): 7. arXiv:1505.01845. Bibcode:2015ApJ...809....7B. doi:10.1088/0004-637X/809/1/7. S2CID 37742564.
4. "Kepler-296". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 November 2017.
5. "Open Exoplanet Catalogue - Kepler-296 b". www.openexoplanetcatalogue.com. Retrieved 2021-03-19.
6. Becker, Juliette C.; Adams, Fred C. (2017), "Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems", Monthly Notices of the Royal Astronomical Society, 468 (1): 549–563, arXiv:1702.07714, Bibcode:2017MNRAS.468..549B, doi:10.1093/mnras/stx461, S2CID 119325005

External links

• Kepler-296 - Open Exoplanet Catalogue