View source for Astronomy:WASP-189 b

{{Short description|Extrasolar planet in the constellation Libra}}
{{Infobox planet
| name                     = WASP-189 b
| image                    = 
| caption                  = Size comparison of WASP-189 b with Jupiter.
<!-- DISCOVERY           -->
| discoverer               = 
| discovered               = 2018
| discovery_method         = [[Astronomy:Methods of detecting exoplanets#Transit photometry|Transit]]<ref name="EA-20200928" /><ref name="CHEOPS" />
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| apsis                    = 
| aphelion                 = 
| perihelion               = 
| semimajor                = 0.05053
| eccentricity             = 
| period                   = 2.72 [[Day|d]]
| inclination              = 
| arg_peri                 = 
| star                     = WASP-189 (HD 133112)
<!-- PHYS CHARS          --> 
| mean_radius              = {{val|1.600|0.017|0.016}} {{Jupiter radius|link=yes}}
| mass                     = 1.99{{clarify|date=February 2022}}
| albedo                   = <0.48<ref>{{citation|arxiv=2201.04518|year=2022|title=The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve|doi=10.1051/0004-6361/202142400|last1=Deline|first1=A.|last2=Hooton|first2=M. J.|last3=Lendl|first3=M.|last4=Morris|first4=B.|last5=Salmon|first5=S.|last6=Olofsson|first6=G.|last7=Broeg|first7=C.|last8=Ehrenreich|first8=D.|last9=Beck|first9=M.|last10=Brandeker|first10=A.|last11=Hoyer|first11=S.|last12=Sulis|first12=S.|last13=Van Grootel|first13=V.|last14=Bourrier|first14=V.|last15=Demangeon|first15=O.|last16=Demory|first16=B.-O.|last17=Heng|first17=K.|last18=Parviainen|first18=H.|last19=Serrano|first19=L. M.|last20=Singh|first20=V.|last21=Bonfanti|first21=A.|last22=Fossati|first22=L.|last23=Kitzmann|first23=D.|last24=Sousa|first24=S. G.|last25=Wilson|first25=T. G.|last26=Alibert|first26=Y.|last27=Alonso|first27=R.|last28=Anglada|first28=G.|last29=Bárczy|first29=T.|last30=Barrado Navascues|first30=D.|journal=Astronomy & Astrophysics|volume=659|pages=A74|bibcode=2022A&A...659A..74D|s2cid=245877604|display-authors=1}}</ref>
| single_temperature       = 3470 [[Kelvin|K]]
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''WASP-189 b''' (also known as '''HD 133112 b''') is an extrasolar planet that has an orbital period around its host star, [[Astronomy:Wide Angle Search for Planets|WASP]]-189 (HD 133112), of less than three earth days, and is about 322 light-years away in the [[Astronomy:Libra (constellation)|Libra constellation]].<ref name="EA-20200928" /><ref name="CHEOPS" /><ref name="A&A-20200917" /> It was first discovered in 2018, and was observed in 2020 by [[Astronomy:CHEOPS|CHEOPS]].

==Discovery and observations==
WASP-189 b was first discovered in 2018.<ref>{{Cite arXiv|eprint=1809.04897|last1=Anderson|first1=D. R.|last2=Temple|first2=L. Y.|last3=Nielsen|first3=L. D.|last4=Burdanov|first4=A.|last5=Hellier|first5=C.|last6=Bouchy|first6=F.|last7=Brown|first7=D. J. A.|last8=Collier Cameron|first8=A.|last9=Gillon|first9=M.|last10=Jehin|first10=E.|last11=Maxted|first11=P. F. L.|last12=Pepe|first12=F.|last13=Pollacco|first13=D.|last14=Pozuelos|first14=F. J.|last15=Queloz|first15=D.|last16=Ségransan|first16=D.|last17=Smalley|first17=B.|last18=Triaud|first18=A. H. M. J.|last19=Turner|first19=O. D.|last20=Udry|first20=S.|last21=West|first21=R. G.|title=WASP-189b: An ultra-hot Jupiter transiting the bright a star HR 5599 in a polar orbit|year=2018|class=astro-ph.EP}}</ref> In 2020, astronomers used CHEOPS to observe it. Based on a passage behind its host star ([[Astronomy:Occultation|occultation]]) the planet's brightness could be measured and the temperature was estimated to be {{convert|3200|C|F K|abbr=on}}. Based on a passage in front of its host star ([[Astronomy:Transit|transit]]) the radius is 1.6 times the radius of [[Astronomy:Jupiter|Jupiter]].<ref name="EA-20200928">{{cite news |author=University of Bern |title=First study with CHEOPS data describes one of the most extreme planets in the universe |url=https://www.eurekalert.org/pub_releases/2020-09/uob-fsw092520.php |date=28 September 2020 |work=EurekAlert! |accessdate=28 September 2020 }}</ref><ref name="CHEOPS">{{cite web |title=First results from Cheops: ESA's exoplanet observer reveals extreme alien world |url=http://www.esa.int/Science_Exploration/Space_Science/Cheops/First_results_from_Cheops_ESA_s_exoplanet_observer_reveals_extreme_alien_world |website=esa.int |publisher=Esa |accessdate=28 September 2020}}</ref><ref name="A&A-20200917">{{cite journal |author=Lendl, M. |display-authors=et al.|title=The hot dayside and asymmetric transit of WASP-189 b seen by CHEOPS? |url=https://www.aanda.org/articles/aa/pdf/forth/aa38677-20.pdf |date=17 September 2020 |journal=Astronomy & Astrophysics |volume=643|pages=A94|doi=10.1051/0004-6361/202038677 |arxiv=2009.13403|bibcode=2020A&A...643A..94L|accessdate=28 September 2020 |doi-access=free }}</ref> Its atmosphere contains titanium oxide, and also contains metals such as chromium, magnesium, vanadium and manganese.<ref>{{cite journal|arxiv=2111.12732|last1=Prinoth|first1=B.|last2=Hoeijmakers|first2=H. J.|last3=Kitzmann|first3=D.|last4=Sandvik|first4=E.|last5=Seidel|first5=J. V.|last6=Lendl|first6=M.|last7=Borsato|first7=N. W.|last8=Thorsbro|first8=B.|last9=Anderson|first9=D. R.|last10=Barrado|first10=D.|last11=Kravchenko|first11=K.|last12=Allart|first12=R.|last13=Bourrier|first13=V.|last14=Cegla|first14=H. M.|last15=Ehrenreich|first15=D.|last16=Fisher|first16=C.|last17=Lovis|first17=C.|last18=Guzmán-Mesa|first18=A.|last19=Grimm|first19=S.|last20=Hooton|first20=M.|last21=Morris|first21=B. M.|last22=Oreshenko|first22=M.|last23=Pino|first23=L.|last24=Heng|first24=K.|title=Titanium oxide and chemical inhomogeneity in the atmosphere of the exoplanet WASP-189 B|journal=Nature Astronomy|year=2022|volume=6|issue=4|pages=449–457|doi=10.1038/s41550-021-01581-z|bibcode=2022NatAs...6..449P|s2cid=244708931}}</ref>

==See also==
* [[Astronomy:Hot Jupiter|Hot Jupiter]]
* [[Astronomy:Wide Angle Search for Planets|Wide Angle Search for Planets]]

==References==
{{Reflist}}

==External links==
* [https://exoplanet.eu/catalog/wasp_189_b--6871/ Planet WASP-189 b]

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{{DEFAULTSORT:WASP-189 b}}
[[Category:Giant planets]]
[[Category:Hot Jupiters]]
[[Category:Libra (constellation)]]
[[Category:Transiting exoplanets]]


{{Sourceattribution|WASP-189 b}}