WASP-76b

WASP-76b is a hot Jupiter exoplanet discovered during 2013 which can be found in the constellation Pisces. It orbits a F-type star BD+01 316 (WASP-76) and has a size 0.92 that of Jupiter's mass.[4][5] In March 2020, it was speculated what as the temperature on the planet reaches 2,400C on hot side, this appears to be hot enough to vaporize neutral iron. If the night side of WASP-76b have temperatures down to at least 1,400C, the iron may condense then rain down as hot liquid iron on its surface.[6]

WASP-76b
Artistic image of WASP-76b (based on 2020 data)
Discovery
Discovered byR.G. West et al. (SuperWASP)[1]
Discovery dateOctober 21, 2013
Transit (including secondary eclipses)
Orbital characteristics
0.033±0.0005 AU
Eccentricity0
1.809886±0.000001[2] d
StarWASP-76
Physical characteristics
Mean radius
1.83±0.06 RJ
Mass0.92±0.03 MJ
Temperature2500±200 K[3]
    An artist's illustration showing WASP-76b during its night hours.

    The planet equilibrium temperature is 2190 K, yet measured dayside temperature is still hotter at 2500±200 K.[3]

    Study shows that WASP-76b seems to be the only planet in its solar system.[7]

    In May 2020, it was discovered what the previously HST-taken spectra of WASP-76b were distorted by the light from the suspected stellar companion. Therefore, updated atmospheric model is cloudy hydrogen-helium envelope, non-detection of alternatively reported neutral iron (including "iron rain"[8]), and only upper limits on oxides of titanium and vanadium.[9] Combination of data from the Hubble and Spitzer space telescopes have allowed to detect titanium oxide and traces of water in atmosphere of WASP-76b though.[10]

    The atmosphere of WASP-76b is cloudy and mostly grey, with a significant amount of thermal incandescence.[9]

    See also

    References
    1. West, R. G.; Hellier, C.; Almenara, J.-M.; Anderson, D. R.; Barros, S. C. C.; Bouchy, F.; Brown, D. J. A.; Collier Cameron, A.; Deleuil, M.; Delrez, L.; Doyle, A. P.; Faedi, F.; Fumel, A.; Gillon, M.; Gómez Maqueo Chew, Y.; Hébrard, G.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Udry, S. (2016). "Three irradiated and bloated hot Jupiters". Astronomy & Astrophysics. 585: A126. arXiv:1310.5607. doi:10.1051/0004-6361/201527276.
    2. Planet WASP-76 b at exoplanet.eu
    3. Zhou, G.; Bayliss, D. D. R.; Kedziora-Chudczer, L.; Tinney, C. G.; Bailey, J.; Salter, G.; Rodriguez, J. (2015). "Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope". Monthly Notices of the Royal Astronomical Society. 454 (3): 3002–3019. arXiv:1509.04147. Bibcode:2015MNRAS.454.3002Z. doi:10.1093/mnras/stv2138.
    4. "WASP-76 b". NASA. Retrieved 2020-05-03.
    5. "ESO Telescope Observes Exoplanet Where It Rains Iron". European Southern Observatory. Retrieved 2020-05-06.
    6. Jonathan Amos. "WASP-76b: The Exotic Inferno Planet Where it 'Rains Iron'". BBC News. Retrieved 2020-05-03.
    7. "On a Faraway Planet, it's Cloudy With a Chance of Liquid Iron Rain". NBC News. Retrieved 2020-05-03.
    8. Lothringer, Joshua D.; Fu, Guangwei; Sing, David K.; Barman, Travis S. (2020). "UV Exoplanet Transmission Spectral Features as Probes of Metals and Rainout". arXiv:2005.02528 [astro-ph.EP].
    9. Edwards, Billy; Changeat, Quentin; Baeyens, Robin; Tsiaras, Angelos; Al-Refaie, Ahmed; Taylor, Jake; Kai Hou Yip; Michelle Fabienne Bieger; Blain, Doriann; Gressier, Amelie; Guilluy, Gloria; Adam Yassin Jaziri; Kiefer, Flavien; Modirrousta-Galian, Darius; Morvan, Mario; Mugnai, Lorenzo V.; Pluriel, William; Poveda, Mathilde; Skaf, Nour; Whiteford, Niall; Wright, Sam; Zingales, Tiziano; Charnay, Benjamin; Drossart, Pierre; Leconte, Jeremy; Venot, Olivia; Waldmann, Ingo; Beaulieu, Jean-Philippe (2020). "ARES I: WASP-76 b, A Tale of Two HST Spectra". arXiv:2005.02374 [astro-ph.EP].
    10. Fu, Guangwei; Deming, Drake; Lothringer, Joshua; Nikolov, Nikolay; Sing, David K.; Kempton, Eliza M. -R.; Ih, Jegug; Evans, Thomas M.; Stevenson, Kevin; Wakeford, H. R.; Rodriguez, Joseph E.; Eastman, Jason D.; Stassun, Keivan; Henry, Gregory W.; López-Morales, Mercedes; Lendl, Monika; Conti, Dennis M.; Stockdale, Chris; Collins, Karen; Kielkopf, John; Barstow, Joanna K.; Sanz-Forcada, Jorge; Ehrenreich, David; Bourrier, Vincent (2020). "The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Strongly Irradiated Giant Exoplanet WASP-76b". arXiv:2005.02568 [astro-ph.EP].
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