Kepler-1708b I

Kepler-1708b I is an exomoon candidate that may orbit around the exoplanet Kepler-1708b, which is located about 5500 light years away from the Earth.

Kepler-1708b I
Discovery
Discovery dateJanuary 12, 2022
Transit method
Designations
Kepler 1708b-i
Orbital characteristics
4.6+3.1
−1.8 days
StarKepler-1708b
Physical characteristics
Mean radius
2.61+0.42
−0.43 R ⊕
Mass<37 M ⊕
North pole declination
+ 43 ° 37 ′ 29 ″

    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 discovered by the Kepler space telescope that caused transit was shown, of which only Kepler 1708b may have satellites. A paper showing the discovery of Kepler 1708b I and it's main star, Kepler 1708b, was submitted to arXiv on January 12, 2022. The false positive rate for Kepler 1708b I is only about 1% – 1% of the cases are when 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 next transit is expected to occur on March 24, 2023. [1]

    Characteristics

    Kepler 1708b I is said to be a Mini-Neptune or possibly a Mega Earth with a radius of about 2.6 Earth. This is a much smaller size than Kepler 1625b I. Kepler 1708b orbits in the same plane as the orbit around the star Kepler 1708 at a distance of 740,000 kilometres from the main planet Kepler 1708b, and the orbital period is about 4.6 days. [1]

    See also

    References
    1. Kipping, David; Bryson, Steve; Burke, Chris; Christiansen, Jessie; Hardegree-Ullman, Kevin; Quarles, Billy; Hansen, Brad; Szulágyi, Judit; Teachey, Alex (13 January 2022). "An exomoon survey of 70 cool giant exoplanets and the new candidate Kepler-1708 b-i". Nature Astronomy. 6: 367–380. arXiv:2201.04643. Bibcode:2022NatAs...6..367K. doi:10.10138/s411550-021-01539-1. S2CID 245906142.
    2. Teachey, Alex; Kipping, David M. (3 October 2018). "Evidence for a large exomoon orbiting Kepler-1625b". Science Advances. 4 (10). arXiv:1810.02362. Bibcode:2018SciA....4.1784T. doi:10.1126/sciadv.aav1784.
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