Gliese 581 d: Difference between revisions
wikademia>Zimriel m Just get rid of "this planet is catalog[u]ed as <starname> x". There is no catalogue for planets to be catalogued in; *stars* get listed in catalogue |
wikademia>Zimriel udry 2007 in the planetbox |
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{{Planetbox orbit | {{Planetbox orbit | ||
| period = | | period = 83.22730 ± 0.65845<ref name=udry>{{cite journal|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...469L..43U&db_key=AST&nosetcookie=1|title=The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M<sub>⊕</sub>) in a 3-planet system|author=Udry, S.; Bonfils, X.; Delfosse, X.; Forveille, T.; Mayor, M.; Perrier, C.; Bouchy, F.; Lovis, C.; Pepe, F.; Queloz, D.; Bertaux, J.-L.|journal=[[Astronomy and Astrophysics]]|volume=469|issue=3|year=2007|pages=L43 – L47|doi=10.1051/0004-6361:20077612|accessdate=2008-08-18}}</ref> | ||
| semimajor = 0. | | semimajor = 0.2525 ± 0.013<ref name=udry /> | ||
| eccentricity = 0. | | eccentricity = 0.12118 ± 0.12034<ref name=udry /> | ||
}} | }} | ||
{{Planetbox character | {{Planetbox character | ||
| mass_earth = >7. | | mass_earth = >7.804 ± 0.69<ref name=udry /> | ||
}} | }} | ||
{{Planetbox discovery | {{Planetbox discovery | ||
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| discovery_method = [[Radial velocity]] | | discovery_method = [[Radial velocity]] | ||
| discovery_site = {{flag|Switzerland}} | | discovery_site = {{flag|Switzerland}} | ||
| discovery_status = Published<ref | | discovery_status = Published<ref name=udry /> | ||
}} | }} | ||
{{Planetbox end}} | {{Planetbox end}} | ||
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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. | 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. | ||
Its likely orbit is inclined at 10-90 degrees, coplanar with b and c. The maximum mass of 581 d which allows the system to be stable is about 50 Earth masses, halfway to [[Saturn]]'s mass. | |||
== Climate and habitability == | == Climate and habitability == | ||
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== References == | == References == | ||
{{reflist}} | {{reflist}} | ||
Revision as of 19:42, 20 August 2008
Template:Planetbox begin Template:Planetbox image Template:Planetbox star Template:Planetbox orbit Template:Planetbox character Template:Planetbox discovery Template:Planetbox end
Gliese 581 d (Template:PronEng) is an 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.
Its likely orbit is inclined at 10-90 degrees, coplanar with b and c. The maximum mass of 581 d which allows the system to be stable is about 50 Earth masses, halfway to Saturn's mass.
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, W.; Bounama, C.; Cuntz, M.; Franck, S.. "The Habitability of Super-Earths in Gliese 581". Astronomy & Astrophysics 476: 1365 – 1371. doi:. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1. Retrieved on 2008-08-18.
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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