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 the Rossiter–McLaughlin effect that WASP-31b is orbiting the parent star in a prograde direction, with the WASP-31 star rotational axis inclined to the planetary orbit by 2.8±3.1 degrees.[5] The spectroscopic study in 2014 revealed that WASP-31b has a dense cloud deck overlaid by a hazy atmosphere.[6] WASP-31b was also reported to have significant amounts of potassium in its upper atmosphere, but the detection of potassium was refuted in 2015.[7] The potassium detection discrepancy was resolved in 2020 with the improved cloud deck model,[8] with the best fit being a very small amount of water over clouds and no potassium at all.[9]

    Reanalysis of planetary spectroscopic data in 2020 has revealed the presence of chromium monohydride besides water.[10]

    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"
    9. ACCESS: Confirmation of no potassium in the atmosphere of WASP-31b, 2020, arXiv:2009.08472
    10. Evidence for chromium hydride in the atmosphere of Hot Jupiter WASP-31b, 2020, arXiv:2011.10558

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