Astronomy:Kepler-1708b I

From HandWiki
Short description: Possible exomoon orbiting Kepler-1708b
Kepler-1708b I
Discovery
Discovery dateJanuary 12, 2022
Transit method
Designations
Kepler 1708b-i
Orbital characteristics
Orbital period4.6+3.1
−1.8
days
Satellite ofKepler-1708b
Physical characteristics
Mean radius2.61+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. 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. Bibcode2022NatAs...6..367K. 
  2. 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. Bibcode2018SciA....4.1784T.