Astronomy:Kepler-1708b I
| Discovery | |
|---|---|
| Discovery date | January 12, 2022 |
| Transit method | |
| Designations | |
| Kepler 1708b-i | |
| Orbital characteristics | |
| Orbital period | 4.6+3.1 −1.8 days |
| Satellite of | Kepler-1708b |
| Physical characteristics | |
| Mean radius | 2.61+0.42 −0.43 R⊕ |
| Mass | <37 M⊕ |
| North pole declination | +43° 37′ 29″ |
Kepler-1708b I is an exomoon candidate that may orbit around the exoplanet Kepler-1708b, which is located about 5500 light-years from the Solar System.
Notations such as Kepler 1708b-i can also be seen.[1] Kepler-1708b I is the second exomoon candidate, after Kepler-1625b I.[2]
Discovery
A survey of 70 cooler giant planets potentially hosting exomoons, discovered by the Kepler space telescope through observation of transits, was conducted; only Kepler-1708b was named as a candidate for having satellites. A paper reporting the possible discovery of Kepler-1708b I was submitted to arXiv on January 12, 2022. The false positive rate for Kepler-1708b I is only about 1%, with an even lower probability that the alleged satellite signal may be due to an unknown exoplanet other than Kepler-1708b orbiting around Kepler-1708. Although there is no evidence that Kepler-1708b I is not an exomoon at this time, it is still in the candidate stage, and future follow-up observations are required to confirm its existence. Additional Kepler-1708b I transit observations and transit-timing variations may be observable if future observations are made by the Hubble Space Telescope, James Webb Space Telescope, PLATO, etc. The last transit occurred on March 24, 2023.[1]
Characteristics
Kepler-1708b I is said to be a mini-Neptune or possibly a super-Earth with a radius of about 2.6 Earth radii. This is a much smaller size than Kepler-1625b I. Kepler-1708b I orbits at a distance of 740,000 kilometres from Kepler-1708b, with a period of about 4.6 days, in the same plane as the planet's orbit around the star.[1]
See also
References
- ↑ 1.0 1.1 1.2 Kipping, David; Bryson, Steve; Burke, Chris; Christiansen, Jessie; Hardegree-Ullman, Kevin; Quarles, Billy; Hansen, Brad; Szulágyi, Judit et al. (13 January 2022). "An exomoon survey of 70 cool giant exoplanets and the new candidate Kepler-1708 b-i". Nature Astronomy 6: 367-380. doi:10.10138/s411550-021-01539-1. Bibcode: 2022NatAs...6..367K.
- ↑ Teachey, Alex; Kipping, David M. (3 October 2018). "Evidence for a large exomoon orbiting Kepler-1625b". Science Advances 4 (10). doi:10.1126/sciadv.aav1784. Bibcode: 2018SciA....4.1784T.
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