WASP-17 is an F-type main sequence star approximately 1,310 light-years away in the constellation Scorpius.
WASP-17 is named Dìwö. The name was selected in the NameExoWorlds campaign by Costa Rica, during the 100th anniversary of the IAU. Dìwö in Bribri language means the sun.
The star, although similar to the Sun in terms of overall contents of heavy elements, is depleted of carbon. The carbon to oxygen molar ratio of 0.18±0.04 for WASP-17 is well below the solar ratio of 0.55.
news.bbc.co.ukPlanetary system
Main article: WASP-17b
As of 2009, an exoplanet has been confirmed to orbit the star. The planet, WASP-17b, is unusual in that it is believed to orbit in the opposite direction to the star's spin (a retrograde orbit), and is twice the size of Jupiter, but half its mass.78 The planet is also named Ditsö̀. It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.9
The planet was discovered by the SuperWASP project, hence the name.
The WASP-17 planetary system10| Companion(in order from star) | Mass | Semimajor axis(AU) | Orbital period(days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Ditsö̀ | 0.512±0.037 MJ | 0.05151±0.00035 | 3.7354845(19) | <0.020 | 86.83+0.68−0.53° | 1.991±0.081 RJ |
References
Anderson, D. R.; et al. (2010). "WASP-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit". The Astrophysical Journal. 709 (1): 159–167. arXiv:0908.1553. Bibcode:2010ApJ...709..159A. doi:10.1088/0004-637X/709/1/159. S2CID 53628741. /wiki/ArXiv_(identifier) ↩
Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. https://doi.org/10.1051%2F0004-6361%2F202243940 ↩
"Newfound Planet Orbits Backward". Space.com. 12 August 2009. http://www.space.com/scienceastronomy/090812-backward-planet.html ↩
"Approved names". NameExoworlds. Retrieved 2020-01-02. http://www.nameexoworlds.iau.org/final-results ↩
"International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02. https://www.iau.org/news/pressreleases/detail/iau1912/ ↩
Polanski, Alex S.; Crossfield, Ian J. M.; Howard, Andrew W.; Isaacson, Howard; Rice, Malena (2022), "Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec", Research Notes of the American Astronomical Society, 6 (8): 155, arXiv:2207.13662, Bibcode:2022RNAAS...6..155P, doi:10.3847/2515-5172/ac8676 /wiki/ArXiv_(identifier) ↩
"New exoplanet orbits 'backwards'". August 12, 2009 – via news.bbc.co.uk. http://news.bbc.co.uk/2/hi/science/nature/8197683.stm ↩
"New-found Planet Orbits Backward". https://news.yahoo.com/s/space/20090812/sc_space/newfoundplanetorbitsbackward ↩
D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011 https://www.aanda.org/articles/aa/full_html/2011/05/aa16356-10/T2.html ↩
Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163. /wiki/Astronomy_%26_Astrophysics ↩