What is WASP-17?
'''WASP-17''' is a [[main sequence]] [[star]] about 1,300 [[Light year|light years]] away in the [[constellation]] [[Scorpius]]. It has the [[Stellar classification|spectral type]] F6V.<ref>{{Cite web|date=12 August 2009|title=Newfound Planet Orbits Backward|url=http://www.space.com/scienceastronomy/090812-backward-planet.html|website=[[Space.com]]}}</ref> WASP-17 is also known as '''Dìwö'''. The name was selected in the [[NameExoWorlds]] campaign by [[Costa Rica]]. At that time, it was the 100th anniversary of the [[International Astronomical Union|IAU]]. Dìwö in [[Bribri language]] means the [[sun]].<ref>{{Cite web|title=Approved names|url=http://www.nameexoworlds.iau.org/final-results|access-date=2020-01-02|website=NameExoworlds|language=en}}</ref><ref>{{Cite web|title=International Astronomical Union {{!}} IAU|url=https://www.iau.org/news/pressreleases/detail/iau1912/|access-date=2020-01-02|website=www.iau.org}}</ref> The star has about the same amount of heavy elements as the Sun. However, it has less carbon than the Sun. The carbon-to-oxygen [[mole (unit)|molar]] ratio of 0.18{{±|0.04}} for WASP-17 is far below the solar ratio of 0.55.<ref>{{citation|last1=Polanski|first1=Alex S.|title=Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec|year=2022|arxiv=2207.13662|last2=Crossfield|first2=Ian J. M.|last3=Howard|first3=Andrew W.|last4=Isaacson|first4=Howard|last5=Rice|first5=Malena}}</ref> == Planetary system == {{Main|WASP-17b}} An [[extrasolar planet]] known as WASP-17b was confirmed orbiting the star as of 2009. The star is unusual for the reason that WASP-17b<ref>[http://news.bbc.co.uk/2/hi/science/nature/8197683.stm BBC NEWS | Science & Environment |]</ref><ref>[https://news.yahoo.com/s/space/20090812/sc_space/newfoundplanetorbitsbackward New-found Planet Orbits Backward]</ref> is believed to orbit in the opposite direction to the direction the star spins and is said to be twice the size of [[Jupiter]], but half its mass. It is subject to deep photo-evaporation, and may be completely de