WASP-189 b
Ultra-hot Jupiter in the constellation Libra
From Wikipedia, the free encyclopedia
WASP-189 b (also known as HD 133112 b) is an ultra-hot jupiter that orbits around the A-type star WASP-189 which is located about 322 light years from Earth in the Libra constellation. It was first discovered in 2018, and was observed in 2020 by CHEOPS (Characterising Exoplanets Satellite).
It has a mass of 1.99 Jupiters and a radius of 1.6 Jupiters. It orbits around a rapidly rotating A6IV-V star. It has a polar orbit around the star with a distance of 0.05 AU taking around 2.72 days to complete and orbit.[1][2]
Discovery
Characteristics
The planet has a mass of around 1.99 Jupiter masses with a radius of around 1.6 Jupiter radii.
Temperature
The CHEOPS spacecraft was used to estimate the temperature of WASP-189 b. Assuming inefficient heat redistribution, the temperature of WASP-189 b was estimated to be around 3,200 °C (5,790 °F; 3,470 K). Assuming efficient heat redistribution and zero albedo, the temperature was calculated to be around 2,367 °F (2,367 °F; 1,570 K).[5] These observations would make WASP-189 b a ultra-hot jupiter and one of the hottest known exoplanets discovered to date.
Atmosphere
Various spacecraft have been used to study the atmosphere of WASP-189 b such as CHEOPS and CUTE (Colorado Ultraviolet Transit Experiment). The extreme temperatures of ultra-hot Jupiters such as WASP-189 b allow for the study of refractory elements that remain gaseous at high temperatures.[6]
Results show that the atmosphere contains many metal and volatile elements. CHEOPS observed titanium oxide (TiO) and vanadium oxide (VO) and a variety of metals such as chromium (Cr), magnesium (Mg), vanadium (V) and manganese (Mn). Singly ionized Iron (Fe, Fe+, Fe ll)[7][8] and Titanium (Ti, Ti+) were also found.[9] The Immersion Grating Infrared Spectrometer (IGRINS) on Gemini South detected neutral Iron (Fe I), magnesium (Mg I), silicon (Si I), water (H2O), carbon monoxide (CO) and hydroxyl (OH).[6]
