Astronomy:Kepler-78
Kepler-78 (formerly known as KIC 8435766) is a 12th magnitude star 407 light-years (125 parsecs) away in the constellation Cygnus. Initially classified as an eclipsing binary with orbital period 0.710015 days,[1] it was later re-classified as a single star with significant interaction between star magnetosphere and close-in planet.[2] The radius of the star is of about 74% of the Sun, and the effective temperature is about 5,100 K.
Planetary system
The Kepler-78 planetary system is composed of one known planet called Kepler-78b, a planet slightly bigger than Earth with an extremely close orbit to the parent star. The orbital period of this planet is about 8.5 hours because of its proximity to its star. While it has a similar density to the Earth (at 5.57 g/cm3), its surface temperature is about 1300 to 1500 K.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.68±0.27 M⊕ | 0.00901+0.00012 −0.00019 |
0.35500745±0.00000008 | 0 | 75.2+2.6 −2.1° |
1.201±0.028 R⊕ |
References
- ↑ Slawson, Robert W.; Prša, Andrej; Welsh, William F.; Orosz, Jerome A.; Rucker, Michael; Batalha, Natalie; Doyle, Laurance R.; Engle, Scott G. et al. (2011). "Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release". The Astronomical Journal 142 (5): 160. doi:10.1088/0004-6256/142/5/160. Bibcode: 2011AJ....142..160S.
- ↑ Strugarek, A.; Brun, A. S.; Donati, J.-F.; Moutou, C.; Réville, V. (2019). "Chasing Star–Planet Magnetic Interactions: The Case of Kepler-78". The Astrophysical Journal 881 (2): 136. doi:10.3847/1538-4357/ab2ed5. Bibcode: 2019ApJ...881..136S.
- ↑ Pepe, Francesco; Cameron, Andrew Collier; Latham, David W.; Molinari, Emilio; Udry, Stéphane; Bonomo, Aldo S.; Buchhave, Lars A.; Charbonneau, David et al. (2013). "An Earth-sized planet with an Earth-like density". Nature 503 (7476): 377–80. doi:10.1038/nature12768. PMID 24172902. Bibcode: 2013Natur.503..377P.
- ↑ Bonomo, A. S. et al. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". Astronomy & Astrophysics. doi:10.1051/0004-6361/202346211.
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