WASP-50 is a G-type main-sequence star about 594 light-years away. The star is older than the Sun and slightly depleted in heavy elements compared to the Sun, and has a close to average starspot activity.[5] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by giant planet on close orbit.[3]
The star was named Chaophraya in December 2019 by the Thai amateur astronomers.[6]
Planetary system
In 2011 a transiting hot superjovian planet b (named Maeping in 2019[6]) was detected.[5] In 2022 its albedo was found to be no more than 0.44, meaning that the planet reflects less than 44% of the light irradiated by its host star. This allows the planetary equilibrium temperature to be constrained at 1393±42 K.[7]
^ abcGillon, M.; Doyle, A. P.; Lendl, M.; Maxted, P. F. L.; Triaud, A. H. M. J.; Anderson, D. R.; Barros, S. C. C.; Bento, J.; Collier-Cameron, A.; Enoch, B.; Faedi, F.; Hellier, C.; Jehin, E.; Magain, P.; Montalban, J.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Segransan, D.; Smith, A. M. S.; Southworth, J.; Udry, S.; West, R. G.; Wheatley, P. J. (2011), "WASP-50 b: a hot Jupiter transiting a moderately active solar-type star", Astronomy & Astrophysics, 533: A88, arXiv:1108.2641, Bibcode:2011A&A...533A..88G, doi:10.1051/0004-6361/201117198, S2CID46639973
^Blažek, Martin; Kabáth, Petr; Piette, Anjali A A; Madhusudhan, Nikku; Skarka, Marek; Šubjak, Ján; Anderson, David R; Boffin, Henri M J; Cáceres, Claudio C; Gibson, Neale P; Hoyer, Sergio; Ivanov, Valentin D; Rojo, Patricio M (2022-04-09). "Constraints on TESS albedos for five hot Jupiters". Monthly Notices of the Royal Astronomical Society. 513 (3): 3444–3457. doi:10.1093/mnras/stac992. ISSN0035-8711.
^Tregloan-Reed, Jeremy; Southworth, John (2012), "An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system", Monthly Notices of the Royal Astronomical Society, 431: 966–971, arXiv:1212.0686, doi:10.1093/mnras/stt227, S2CID118869498