WASP-17b

WASP-17b / Ditsö̀
Artist impression of Ditsö̀
Discovery[1]
Discovered byDavid R. Anderson et al
Discovery date11 August 2009
Transit (including secondary eclipse)
Orbital characteristics[2]
0.05151±0.00035 AU
Eccentricity<0.020
3.7354845±0.0000019 d
Inclination86.83°+0.68°
−0.53°
−70[citation needed]
Semi-amplitude56.0+4.1
−4.0 m/s
StarWASP-17
Physical characteristics[2]
1.991±0.081 RJ
Mass0.512±0.037 MJ
Mean density
0.080+0.013
−0.011 g/cm3
Temperature1,550+170
−200 K[3]

WASP-17b, officially named Ditsö̀[pronunciation?], is an exoplanet in the constellation Scorpius that is orbiting the star WASP-17. Its discovery was announced on 11 August 2009.[1] It is the first planet discovered to have a retrograde orbit, meaning it orbits in a direction counter to the rotation of its host star.[1] This discovery challenged traditional planetary formation theory.[4] In terms of diameter, WASP-17b is one of the largest exoplanets discovered and at half Jupiter's mass, this made it the most puffy planet known in 2010.[5] On 3 December 2013, scientists working with the Hubble Space Telescope reported detecting water in the exoplanet's atmosphere.[6][7]

WASP-17b's name was selected in the NameExoWorlds campaign by Costa Rica, during the 100th anniversary of the International Astronomical Union. Ditsö̀ is the name that the god Sibö̀ gave to the first Bribri people in Talamancan mythology.[8][9]

  1. ^ a b c Cite error: The named reference Anderson2010 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Bonomo2017 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference AandA2018 was invoked but never defined (see the help page).
  4. ^ "A planet going the wrong way", Phys Org. June 7, 2011. Accessed June 10, 2011
  5. ^ Kaufman, Rachel (17 August 2009). ""Backward" Planet Has Density of Foam Coffee Cups". National Geographic. National Geographic Society. Archived from the original on August 20, 2009. Retrieved 6 February 2011.
  6. ^ "Hubble Traces Subtle Signals of Water on Hazy Worlds". NASA. 3 December 2013. Retrieved 4 December 2013.
  7. ^ Mandell, Avi M.; Haynes, Korey; Sinukoff, Evan; Madhusudhan, Nikku; Burrows, Adam; Deming, Drake (3 December 2013). "Exoplanet Transit Spectroscopy Using WFC3: WASP-12 b, WASP-17 b, and WASP-19 b". Astrophysical Journal. 779 (2): 128. arXiv:1310.2949. Bibcode:2013ApJ...779..128M. doi:10.1088/0004-637X/779/2/128. S2CID 52997396.
  8. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. ^ "100 000s of People from 112 Countries Select Names for Exoplanet Systems In Celebration of IAU's 100th Anniversary". International Astronomical Union. Retrieved 2020-01-02.