Gliese 581 d: Difference between revisions
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== Climate and habitability == | == Climate and habitability == | ||
Although Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star, scientists surmise that conditions on the planet may be conducive to supporting life.<ref>http://www.space.com/scienceastronomy/070618_mm_gliese_581d.html</ref><ref name="blo07">von Bloh et al. (2007) {{cite web |url= http://www.aanda.org/index.php?option=article&access=bibcode&bibcode=2007A%2526A...476.1365VPDF | Although Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star, scientists surmise that conditions on the planet may be conducive to supporting life.<ref>[http://www.space.com/scienceastronomy/070618_mm_gliese_581d.html SPACE.com - Hopes Dashed for Life on Distant Planet<!-- Bot generated title -->]</ref><ref name="blo07">von Bloh et al. (2007) {{cite web |url= http://www.aanda.org/index.php?option=article&access=bibcode&bibcode=2007A%2526A...476.1365VPDF | ||
|title=The Habitability of Super-Earths in Gliese 581 |publisher=''Astronomy & Astrophysics'' '''476''':1365-1371| accessdate=2008-07-20 }}</ref> Scientists originally believed that Gliese 581 d would in fact be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] as we understand it. However, since it is calculated that the Earth's temperature would be about minus nineteen degrees celsius without any greenhouse gases, and due to a theorized [[greenhouse effect]] of Gliese 581 d, research now suggests that [[atmospheric]] conditions on the planet could create [[temperature]]s at which liquid water can exist, and therefore the planet may be capable of supporting life. | |title=The Habitability of Super-Earths in Gliese 581 |publisher=''Astronomy & Astrophysics'' '''476''':1365-1371| accessdate=2008-07-20 }}</ref> Scientists originally believed that Gliese 581 d would in fact be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] as we understand it. However, since it is calculated that the Earth's temperature would be about minus nineteen degrees celsius without any greenhouse gases, and due to a theorized [[greenhouse effect]] of Gliese 581 d, research now suggests that [[atmospheric]] conditions on the planet could create [[temperature]]s at which liquid water can exist, and therefore the planet may be capable of supporting life. | ||
Revision as of 21:43, 12 August 2008
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Gliese 581 d (Template:PronEng), also cataloged as HO Librae d, is a plausible extrasolar planet approximately 20 light-years away in the constellation of Libra. Because of its mass, the planet is classified as a super-Earth planet. Because the planet orbits in the outer edge of its parent star's habitable zone, it is thought that the planet may be similar to Earth.
Discovery
The planet was discovered by the team of Stéphane Udry of the Geneva Observatory in Switzerland using the HARPS instrument on the European Southern Observatory 3.6 meter telescope in La Silla, Chile on 24 April 2007. Udry's team employed the radial velocity technique, in which the size and mass of a planet are determined based on the small perturbations it induces in its parent star’s orbit via gravity.
The team is confident that the planet exists but recognizes that unlikely events could mimic its existence. They believe the issue will be settled by upcoming studies.
Climate and habitability
Although Gliese 581 d orbits outside the theoretical habitable zone of its star, scientists surmise that conditions on the planet may be conducive to supporting life.[1][2] Scientists originally believed that Gliese 581 d would in fact be too cold for liquid water to exist, and therefore could not support life as we understand it. However, since it is calculated that the Earth's temperature would be about minus nineteen degrees celsius without any greenhouse gases, and due to a theorized greenhouse effect of Gliese 581 d, research now suggests that atmospheric conditions on the planet could create temperatures at which liquid water can exist, and therefore the planet may be capable of supporting life.
References
- ↑ SPACE.com - Hopes Dashed for Life on Distant Planet
- ↑ von Bloh et al. (2007) "The Habitability of Super-Earths in Gliese 581". Astronomy & Astrophysics 476:1365-1371. http://www.aanda.org/index.php?option=article&access=bibcode&bibcode=2007A%2526A...476.1365VPDF. Retrieved on 2008-07-20.
External links
- "Notes for planet Gl 581 d". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/planet.php?p1=Gl+581&p2=d. Retrieved on 2008-07-15.
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