WASP-18b
Template:Short description Script error: No such module "infobox".Script error: No such module "Check for unknown parameters". WASP-18b is an exoplanet that is notable for having an orbital period of less than one day. It has a mass equal to 10 Jupiter masses,[1] just below the boundary line between planets and brown dwarfs (about 13 Jupiter masses). Due to tidal deceleration, it is expected to spiral toward and eventually merge with its host star, WASP-18, in less than a million years.[1] The planet is approximately Script error: No such module "convert". from its star, which is about Script error: No such module "convert". from Earth. A team led by Coel Hellier, a professor of astrophysics at Keele University in England, discovered the exoplanet in 2009.[1]
Scientists at Keele and at the University of Maryland are working to understand whether the discovery of this planet so shortly before its expected demise (with less than 0.1% of its lifetime remaining) was fortuitous, or whether tidal dissipation by WASP-18 is actually much less efficient than astrophysicists typically assume.[1][2] Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.[3]
The closest example of a similar situation in the Solar System is Mars' moon Phobos. Phobos orbits Mars at a distance of only about Script error: No such module "convert"., 40 times closer than the Moon is to the Earth[4] and is expected to be destroyed in about eleven million years.[5]
The planet's dayside temperature, as measured in 2020, is Script error: No such module "convert"..[6] A 2023 study found an average dayside temperature of Script error: No such module "val". (Script error: No such module "convert".).[7]
A study in 2012, utilizing the Rossiter–McLaughlin effect, determined that the planetary orbit is well aligned with the equatorial plane of the star, with a misalignment equal to 13±7°.[8]
A 2017 study detected carbon monoxide in the planet's atmosphere, without signs of water vapor.[9][10] However, in 2023, the James Webb Space Telescope detected water vapor in the planet's atmosphere.[7][11]
See also
References
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- ↑ a b c d Script error: No such module "Citation/CS1".
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- ↑ Johnson, John Jr.; Astrophysicists puzzle over planet that's too close to its sun, Los Angeles Times (August 27, 2009).
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External links
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