HD 133112

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WASP-189 b
Discovery
Discovery date2018
Transit[1][2]
Orbital characteristics
0.05053
2.72 d
StarWASP-189 (HD 133112)
Physical characteristics
1.600+0.017
−0.016 RJ
Mass1.99 MJ
Albedo<0.48[3]
Temperature3470 K

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

WASP-189 b was first discovered in 2018 using the transit method.[4] In 2020, astronomers used CHEOPS to observe it.[1][2][5]

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]

See also

References

  1. University of Bern (28 September 2020). "First study with CHEOPS data describes one of the most extreme planets in the universe". EurekAlert!. Archived from the original on 30 September 2020. Retrieved 28 September 2020.
  2. "First results from Cheops: ESA's exoplanet observer reveals extreme alien world". esa.int. Esa. Retrieved 28 September 2020.
  3. Deline, A.; et al. (2022), "The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve", Astronomy & Astrophysics, 659: A74, arXiv:2201.04518, Bibcode:2022A&A...659A..74D, doi:10.1051/0004-6361/202142400, S2CID 245877604
  4. Anderson, D. R.; Temple, L. Y.; Nielsen, L. D.; Burdanov, A.; Hellier, C.; Bouchy, F.; Brown, D. J. A.; Collier Cameron, A.; Gillon, M.; Jehin, E.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Pozuelos, F. J.; Queloz, D.; Ségransan, D.; Smalley, B.; Triaud, A. H. M. J.; Turner, O. D.; Udry, S.; West, R. G. (2018). "WASP-189b: An ultra-hot Jupiter transiting the bright a star HR 5599 in a polar orbit". arXiv:1809.04897 [astro-ph.EP].
  5. Lendl, M.; et al. (17 September 2020). "The hot dayside and asymmetric transit of WASP-189 b seen by CHEOPS?" (PDF). Astronomy & Astrophysics. 643: A94. arXiv:2009.13403. Bibcode:2020A&A...643A..94L. doi:10.1051/0004-6361/202038677. Retrieved 28 September 2020.
  6. Sanchez, Jorge A.; Smith, Peter C. B.; Kanumalla, Krishna; Welbanks, Luis; Line, Michael R.; Pelletier, Stefan; Desch, Steven; Young, Patrick; Patience, Jennifer; Bean, Jacob; Brogi, Matteo; Jaffe, Dan; Mace, Gregory N.; Mansfield, Megan Weiner; Panwar, Vatsal (2026-02-18). "A Stellar magnesium to silicon ratio in the atmosphere of an exoplanet". Nature Communications. 17 (1): 2902. doi:10.1038/s41467-026-69610-x. ISSN 2041-1723. PMC 13031952. PMID 41708629.
  7. Deibert, Emily K.; Langeveld, Adam B.; Young, Mitchell E.; Flagg, Laura; Turner, Jake D.; Smith, Peter C. B.; de Mooij, Ernst J. W.; Jayawardhana, Ray; Chiboucas, Kristin; Gamen, Roberto; Hayes, Christian R.; Heo, Jeong-Eun; Jeong, Miji; Kalari, Venu; Martioli, Eder (2024-09-09). "High-resolution Dayside Spectroscopy of WASP-189 b: Detection of Iron during the GHOST/Gemini South System Verification Run". The Astronomical Journal. 168 (4): 148. arXiv:2407.11281. Bibcode:2024AJ....168..148D. doi:10.3847/1538-3881/ad643f. ISSN 0004-6256.
  8. Sreejith, A. G.; France, Kevin; Fossati, Luca; Koskinen, Tommi T.; Egan, Arika; Cauley, P. Wilson; Cubillos, Patricio. E.; Ambily, S.; Huang, Chenliang; Lavvas, Panayotis; Fleming, Brian T.; Desert, Jean-Michel; Nell, Nicholas; Petit, Pascal; Vidotto, Aline (2023-08-31). "CUTE Reveals Escaping Metals in the Upper Atmosphere of the Ultrahot Jupiter WASP-189b". The Astrophysical Journal Letters. 954 (1): L23. arXiv:2308.05726. Bibcode:2023ApJ...954L..23S. doi:10.3847/2041-8213/acef1c. ISSN 2041-8205.
  9. Prinoth, B.; Hoeijmakers, H. J.; Kitzmann, D.; Sandvik, E.; Seidel, J. V.; Lendl, M.; Borsato, N. W.; Thorsbro, B.; Anderson, D. R.; Barrado, D.; Kravchenko, K.; Allart, R.; Bourrier, V.; Cegla, H. M.; Ehrenreich, D.; Fisher, C.; Lovis, C.; Guzmán-Mesa, A.; Grimm, S.; Hooton, M.; Morris, B. M.; Oreshenko, M.; Pino, L.; Heng, K. (2022). "Titanium oxide and chemical inhomogeneity in the atmosphere of the exoplanet WASP-189 B". Nature Astronomy. 6 (4): 449–457. arXiv:2111.12732. Bibcode:2022NatAs...6..449P. doi:10.1038/s41550-021-01581-z. S2CID 244708931.