WASP-189 b

WASP-189 b (also known as HD 133112 b) is an extrasolar planet that has an orbital period around its host star, WASP-189 (HD 133112), of less than three earth days, and is about 322 light-years away in the Libra constellation.^[1][2][4] It was first discovered in 2018, and was observed in 2020 by CHEOPS.

WASP-189 b

Discovery
Discovery date	2018
Detection method	Transit[1][2]
Orbital characteristics
Semi-major axis	0.05053
Orbital period (sidereal)	2.72 d
Star	WASP-189 (HD 133112)
Physical characteristics
Mean radius	1.600+0.017 −0.016 RJ
Mass	1.99 MJ
Albedo	<0.48[3]
Temperature	3470 K

Discovery and observations

WASP-189 b was first discovered in 2018.^[5] In 2020, astronomers used CHEOPS to observe it. Based on a passage behind its host star (occultation) the planet's brightness could be measured and the temperature was estimated to be 3,200 °C (5,790 °F; 3,470 K). Based on a passage in front of its host star (transit) the radius is 1.6 times the radius of Jupiter.^[1][2][4] Its atmosphere contains titanium oxide, and also contains metals such as chromium, magnesium, vanadium and manganese.^[6]

See also

• Hot Jupiter
• Wide Angle Search for Planets

References

1. University of Bern (28 September 2020). "First study with CHEOPS data describes one of the most extreme planets in the universe". EurekAlert!. 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. 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.
5. 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].
6. 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.

External links

• Planet WASP-189 b