WASP-28b

WASP-28b or K2-1b is an extrasolar planet discovered in 2010[4] by the Wide Angle Search for Planets (WASP) project orbiting WASP-28, a magnitude 12 star also known as 1SWASP J233427.87-013448.1, 2MASS J23342787-0134482 and K2-1.[5][1] Since it orbits its star very closely, the planet is a strongly irradiated hot Jupiter.[1] As seen from the Earth, WASP-28b transits its host star every 3.41 days taking about 3 hours to do so.[1]

WASP-28b
Size comparison of WASP-28b with Jupiter.
Discovery[1]
Discovered byWide Angle Search for Planets
Discovery date2010
Transit
Orbital characteristics
0.0442±0.0010 AU
Eccentricity<0.075[2]
3.40883495±0.00000015[2] d
Inclination88.61 ± 0.67[1]
StarWASP-28
Physical characteristics
Mean radius
1.319+0.028
−0.026[3] RJ
Mass0.948+0.051
−0.052[3] MJ
Temperature1468 ± 37[1] K

    The planet was observed by the Kepler spacecraft during the K2 mission engineering campaign in February 2014 as part of an early science demonstration.[6] It was also observed from December 2016 to March 2017 during K2's campaign 12 which allowed a refinement of the system parameters.[2]

    Internal structure

    The planet seems to be a gas giant with a low core mass (<~10M(Earth)) and a low heavy elements content (Z<~0.2).[1]

    References
    1. Anderson, D. R.; et al. (2015). "WASP-20b and WASP-28b: A hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars". Astronomy and Astrophysics. 575 A61. arXiv:1402.1482. Bibcode:2015A&A...575A..61A. doi:10.1051/0004-6361/201423591.
    2. Močnik, T.; Hellier, C.; Anderson, D. R. (2020). "K2 Looks Toward WASP-28 and WASP-151". Publications of the Astronomical Society of the Pacific. 132 (1007) 014401: 014401. arXiv:1710.08892. Bibcode:2020PASP..132a4401M. doi:10.1088/1538-3873/ab5598.
    3. Wang, Xian-Yu; et al. (1 July 2021). "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves". The Astrophysical Journal Supplement Series. 255 (1) 15. arXiv:2105.14851. Bibcode:2021ApJS..255...15W. doi:10.3847/1538-4365/ac0835. S2CID 235253975.
    4. internet archive - WASP-28b: a hot Jupiter transiting a low-metallicity star
    5. "WASP-28". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 20, 2017.
    6. Howell, Steve B.; et al. (2014). "The K2 Mission: Characterization and Early Results". Publications of the Astronomical Society of the Pacific. 126 (938): 398–408. arXiv:1402.5163. Bibcode:2014PASP..126..398H. doi:10.1086/676406.
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