Kepler-70b: Difference between revisions
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'''Kepler-70b''' (formerly called '''KOI-55.01''';<ref name=nature-KOI-55/> sometimes listed as '''KOI-55 b''') is a [[planet]] discovered orbiting the |
'''Kepler-70b''' (formerly called '''KOI-55.01''';<ref name=nature-KOI-55/> sometimes listed as '''KOI-55 b''') is a [[planet]] discovered orbiting the star [[Kepler-70]]. It orbits its host along with another planet, Kepler-70c, both of which orbit very close to their host star. Kepler-70b completes one orbit around its star in just 5.76 hours, one of the shortest orbital periods of any exoplanetary system yet discovered, only second to [[PSR 1719-14 b]] with a period of 2.2 hours. It is also the hottest [[exoplanet]] as of mid-2013, with a surface temperature of 7178 [[Kelvin|K]]. Its density is 5500 [[Density|kg/m<sup>3</sup>]] which is not much different than Earth.<ref>{{cite web|url=http://kepler.nasa.gov/Mission/discoveries/|title=Kepler mission disoveries|accessdate=23 May 2013}}</ref> |
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[[Kepler-70c]] passes 240,000 km away from Kepler-70b during their closest approach. This is currently the closest recorded approach between planets. |
[[Kepler-70c]] passes 240,000 km away from Kepler-70b during their closest approach. This is currently the closest recorded approach between planets. |
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Revision as of 05:24, 12 December 2013
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Kepler-70b (formerly called KOI-55.01;[1] sometimes listed as KOI-55 b) is a planet discovered orbiting the subdwarf B star (sdB) Kepler-70. It orbits its host along with another planet, Kepler-70c, both of which orbit very close to their host star. Kepler-70b completes one orbit around its star in just 5.76 hours, one of the shortest orbital periods of any exoplanetary system yet discovered, only second to PSR 1719-14 b with a period of 2.2 hours. It is also the hottest exoplanet as of mid-2013, with a surface temperature of 7178 K. Its density is 5500 kg/m3 which is not much different than Earth.[2]
Kepler-70c passes 240,000 km away from Kepler-70b during their closest approach. This is currently the closest recorded approach between planets.
According to the main author of the paper in Nature which announced the discovery of the two planets, Stephane Charpinet, the two planets "probably plunged deep into the star’s envelope during the red giant phase, but survived.”[3] However, this is not the first sighting of planets orbiting a post-red giant star - numerous pulsar planets have been observed, but no planet has been found with such a short period around any star, whether or not on the main sequence.
Origins
The two planets were most likely gas giants which spiraled inward toward their host star, which subsequently became a red giant, vaporizing much of the planets except for parts of their solid cores, which are now orbiting the sdB star.[3] According to the Extrasolar Planets Encyclopedia, the star left the red giant stage 18.4 million years ago.[4]
See also
Notes
External links
References
- ^ Cite error: The named reference
nature-KOI-55was invoked but never defined (see the help page). - ^ "Kepler mission disoveries". Retrieved 23 May 2013.
- ^ a b "Two More Earth-Sized Planets Discovered by Kepler, Orbiting Former Red Giant Star". Universe Today. Retrieved 1 January 2012.
- ^ Cite error: The named reference
ExtrasolardatabaseKOI-55was invoked but never defined (see the help page).