|WASP-18 > WASP-18b > Gliese 436 b|
Knifed (revived), crushed by tanks (revived again), crushed by Squash (revived again), exploded (revived again), crushed by anvil (revived again).
WASP-18b is an extrasolar planet that is notable for having an orbital period of less than one day. It has a mass equal to 10 Jupiter masses, just below the boundary line between planets and brown dwarfs, about 13 Jupiter masses. Due to tidal deceleration, it is expected to spiral towards and eventually merge with its host star, WASP-18, in less than a million years. The planet is approximately 3.1 million kilometres (1.9 million miles) from its star, which is about 325 light years from Earth. It was discovered by Coel Hellier, a professor of astrophysics at Keele University in England.
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. Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.
The closest example of a similar situation in the Solar System is Mars' moon Phobos. Phobos orbits Mars at a distance of only about Template:Convert, 40 times closer than the Moon is to the Earth, and is expected to be destroyed in about eleven million years.
See also Edit
- ↑ Cite error: Invalid
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- ↑ Suicidal planet seems on death spiral into star, breitbart.com, August 26, 2009
- ↑ Template:Cite journal
- ↑ Template:Cite web
- ↑ Astrophysicists puzzle over planet that's too close to its sun, Los Angeles Times, August 27, 2009
- ↑ Template:Cite arXiv
- COROT mission
- Mass = 3.47 Jupiter mass
- Radius = 1.31 Jupiter radius
- Semi-major axis = 0.030 AU
- Eccentricity < 0.08
- Orbital period = 1.9 Earth days
About the exoplanetEdit
- COROT-18b is likely to be a large gas giant.