WASP-31b

WASP-31b is a low-density (puffy) "hot Jupiter" extrasolar planet orbiting the metal-poor (63% of solar metallicity) dwarf star WASP-31.[1] The exoplanet was discovered in 2010 by the WASP project.[2][1] WASP-31b is in the constellation of Crater,[3] and is about 1305 light-years[4] (light travel distance) from Earth.[2]

WASP-31b
"Hot Jupiter" exoplanet WASP-31b (artist concept)
Discovery
Discovered byAnderson, D.R. et al.[1]
Discovery siteWASP[2]
Discovery date2010[2]
Primary transit[2]
Orbital characteristics
0.04657±0.00034 AU
Eccentricity0[2]
3.40591[2] d
Inclination84.54±0.027[2]
StarWASP-31[2]
Physical characteristics
Mean radius
1.537±0.06[2] RJ
Mass0.478±0.03[2] MJ

    Characteristics

    WASP-31b is a low-density (puffy) "hot Jupiter" exoplanet with a mass about 0.48 times that of Jupiter and a radius about 1.55 times that of Jupiter.[2][1] The exoplanet orbits WASP-31, its host star, every 3.4 days.[2]

    Comparison of "hot Jupiter" exoplanets, including WASP-31b
    (top row; 3rd from left) (artist concept)

    From top left to lower right: WASP-12b, WASP-6b, WASP-31b, WASP-39b, HD 189733b, HAT-P-12b, WASP-17b, WASP-19b, HAT-P-1b and HD 209458b.

    In 2012, it was found from Rossiter–McLaughlin effect what WASP-31b orbit is orbiting the parent star in prograde direction, with WASP-31 star rotational axis inclined to planetary orbit by 2.8±3.1 degrees.[5] The spectroscopic study in 2014 have revealed the WASP-31b have a dense cloud deck overlaid by hazy atmosphere.[6] WASP-31b was also reported to have significant amounts of potassium in upper atmosphere, but detection of potassium was refuted in 2015.[7] The potassium detection discrepancy was resolved in 2020 with the improved cloud deck model.[8]

    gollark: Also, this person seems to just be complaining about computer speed increases being slower?
    gollark: computers goodnot computers bad
    gollark: Expanding on what I previously said, you can already pay for a commercial suborbital flight these days, and space travel is cheapening, so maybe by 2030 you'll be able to travel between continents by rocket in an hour or so by commercial suborbital rocket for... a million dollars or so.People will inevitably complain about this, too.
    gollark: The nuclear fuel heats the propellant which gives it exhaust velocity.
    gollark: Yes they do. Not that they're actually used because nuclear.

    See also

    References
    1. Anderson, D.R.; et al. (2011). "WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star" (PDF). Astronomy & Astrophysics. 531: A60. arXiv:1011.5882. Bibcode:2011A&A...531A..60A. doi:10.1051/0004-6361/201016208.
    2. Staff (2018). "Planet WASP-31 b". Extrasolar Planets Encyclopaedia. Retrieved 2 March 2018.
    3. DJM (2018). "Finding the constellation which contains given sky coordinates". djm.cc. Retrieved 2 March 2018.
    4. Kyle (2018). "Convert Parsecs to Light Years". KylesConverter.com. Retrieved 2 March 2018.
    5. Brown, D. J. A.; Cameron, A. Collier; Anderson, D. R.; Enoch, B.; Hellier, C.; Maxted, P. F. L.; Miller, G. R. M.; Pollacco, D.; Queloz, D.; Simpson, E.; Smalley, B.; Triaud, A. H. M. J.; Boisse, I.; Bouchy, F.; Gillon, M.; Hébrard, G. (2012). "Rossiter-Mc Laughlin effect measurements for WASP-16, WASP-25 and WASP-31★". Monthly Notices of the Royal Astronomical Society. 423 (2): 1503–1520. arXiv:1203.4971. Bibcode:2012MNRAS.423.1503B. doi:10.1111/j.1365-2966.2012.20973.x.
    6. The atmosphere of hot-Jupiter exoplanet WASP-31b
    7. Gibson, Neale P.; De Mooij, Ernst J W.; Evans, Thomas M.; Merritt, Stephanie; Nikolov, Nikolay; Sing, David K.; Watson, Chris (2019). "Revisiting the potassium feature of WASP-31b at high resolution". Monthly Notices of the Royal Astronomical Society. 482 (1): 606–615. arXiv:1810.03693. Bibcode:2019MNRAS.482..606G. doi:10.1093/mnras/sty2722.
    8. J. Chouqar, M. L. Morales, A. Daassou, A. Jabiri, Z. Benkhaldoun, Bruce G. Elmegreen, L. Viktor Tóth, Manuel Güdel, "Modeling the Transmission Spectra of WASP-31b"

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