Astronomy:Kepler-223
Kepler-223 (KOI-730, KIC 10227020) is a G8 star with an extrasolar planetary system discovered by the Kepler mission. Studies indicate that the Kepler-223 star system consists of 4 planets orbiting the star.[1][2]
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | — | 7.3845 | — | — | 3 R⊕ |
| c | — | — | 9.8456 | — | — | 3.4 R⊕ |
| d | — | — | 14.7887 | — | — | 5.2 R⊕ |
| e | — | — | 19.7257 | — | — | 4.6 R⊕ |
The confirmed planetary system was first detected by the Kepler mission, and contains four planets.[3] This system was initially believed to contain two co-orbital planets orbiting the star at approximately the same orbital distance every 9.8 days, with one permanently locked 60° behind the other in one of the two Trojan Lagrangian points.[4] The two co-orbital planets were thought to be locked in mean motion resonances with the other two planets, creating an overall 6:4:4:3 resonance.[5] This would have been the first known example of co-orbital planets.
However, follow-up study of the system revealed that an alternative configuration, with the four planets having orbital periods in the ratio 8:6:4:3 is better supported by the data. This configuration does not contain co-orbital planets,[6] and has been confirmed by further observations.[2] It represents the first confirmed 4-body orbital resonance.[3]
The radii are 3.0, 3.4, 5.2, and 4.6 Earth radii, and the orbital periods are 7.3845, 9.8456, 14.7887 and 19.7257 days, respectively.[2]
-
Kepler-223 6:4:4:3 orbital ratios -
Kepler-223 8:6:4:3 orbital ratios
References
- ↑ Borucki, William J.; Koch, David G.; Basri, Gibor; Batalha, Natalie; Brown, Timothy M.; Bryson, Stephen T.; Caldwell, Douglas; Christensen-Dalsgaard, Jørgen et al. (2011). "Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data". The Astrophysical Journal 736 (1): 19. doi:10.1088/0004-637X/736/1/19. Bibcode: 2011ApJ...736...19B.
- ↑ 2.0 2.1 2.2 Mills, S. M.; Fabrycky, D. C.; Migaszewski, C.; Ford, E. B.; Petigura, E.; Isaacson, H. (2016-05-11). "A resonant chain of four transiting, sub-Neptune planets". Nature 533 (7604): 509–512. doi:10.1038/nature17445. PMID 27225123. Bibcode: 2016Natur.533..509M.
- ↑ 3.0 3.1 Koppes, S. (2016-05-17). "Kepler-223 System: Clues to Planetary Migration". http://www.jpl.nasa.gov/news/news.php?feature=6515.
- ↑ Chown, Marcus (28 February 2011). "Two planets found sharing one orbit". New Scientist. https://www.newscientist.com/article/dn20160-two-planets-found-sharing-one-orbit.html.
- ↑ Emspak, Jesse (2 March 2011). "Kepler Finds Bizarre Systems". International Business Times. International Business Times Inc.. http://www.ibtimes.com/articles/117984/20110302/kepler-finds-strange-worlds-fastest-planet.htm.
- ↑ Beatty, Kelly (5 March 2011). "Kepler Finds Planets in Tight Dance". Sky and Telescope. http://www.skyandtelescope.com/astronomy-news/kepler-finds-planets-in-tight-dance/.
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<ref> tag with name "KIC" defined in <references> is not used in prior text.External links
- "Planetary System KOI-730 Exhibiting a Pair of Co-Orbital Planets" (this site requires a browser with support for WebGL)
- 2MASS Catalog Retrieval
Coordinates: 
19h 53m 16.40s, +47° 16′ 46.2″
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