Kepler-28b

Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.

Kepler-28b
Discovery
Discovered byJason Steffen et al.
Discovery siteKepler Space Observatory
Discovery date25 January 2012
Transit
Orbital characteristics
0.05375 AU (8,041,000 km)[1]
5.91227[1] d
StarKepler-28
Physical characteristics
Mean radius
2.41+0.04
−0.17[1] R⊕
Mass8.8+3.8
−3.1M⊕[2]
Temperature743 K[2]

    Host star

    Kepler-28 is the host star of Kepler-28b, and is alternatively known as KOI-870 and KIC 6949607. The star is smaller, less massive, and cooler than the Sun, with (respectively) a radius 0.7 times of the Sun; a mass 0.75 times of the Sun; and an effective temperature of 4590 K.[3] The star has a high metallicity with relation to the Sun, as it has a metallicity of [M/H] = 0.34. With an apparent magnitude of 15.05, Kepler-28 is effectively invisible to the naked eye from Earth.[4]

    Characteristics

    Kepler-28b is a gas giant. Upon discovery, it was poorly characterized, with only upper mass limit of 1.51 times the mass of Jupiter can be ascertained from dynamical symulations. The planet, which transits its host star, completely passes across the face of Kepler-28 in 2.77 hours.[4] The ratio of its orbital period with that of Kepler-28c is 1.52.[5] In 2016, improved radial velocity data has allowed to classify Kepler-28b as a small (sub-Neptune) gas giant.[2]

    References
    1. "Kepler-28 b". NASA Exoplanet Archive. Retrieved 23 January 2017.
    2. An overabundance of low-density Neptune-like planets, 2016, arXiv:1611.09236
    3. "Star: Kepler-28". Extrasolar Planets Encyclopaedia. 2012. Archived from the original on 26 April 2012. Retrieved 22 June 2012.
    4. "Kepler Table of Discoveries". Kepler Mission. Ames Research Center, NASA. 2012. Retrieved 22 June 2012.
    5. Steffen, J.; Fabrycky, D. (2012). "Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations" (PDF). Monthly Notices of the Royal Astronomical Society. 421: 2342. arXiv:1201.5412v1. Bibcode:2012MNRAS.421.2342S. doi:10.1111/j.1365-2966.2012.20467.x.


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