Gliese 581 d - Revision history

wikademia>Wikademia at 05:18, 23 April 2009

2009-04-23T05:18:31Z

← Older revision		Revision as of 05:18, 23 April 2009
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	On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>		On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>

			[[Category:Planets]]

wikademia>Wikademia at 05:13, 23 April 2009

2009-04-23T05:13:36Z

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-'''Gliese 581 d''' ({{pron-en|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)|Libra]].  Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
+'''Gliese 581 d''' is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)|Libra]].  Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.
 == Discovery ==
+{{ntnes}}
 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]].<ref name=udry/>
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 On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html|title=Lightest exoplanet yet discovered|publisher=eso.org|date=2009-04-21|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal | url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf|author=Mayor et al.|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system |journal =[[Astronomy and Astrophysics]] |year=2009 }}</ref>

wikademia>Wikademia at 05:13, 23 April 2009

2009-04-23T05:13:09Z

← Older revision		Revision as of 05:13, 23 April 2009
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	~~{{Planetbox begin~~
	~~\| name = Gliese 581 d~~
	}}
	~~{{Planetbox image~~
	~~\| image = Gliese 581 d-v1.jpg~~
	~~\| caption = An artist's impression of Gliese 581 d and speculative moons.~~
	}}
	~~{{Planetbox star~~
	~~\| star = [[Gliese 581]]~~
	~~\| constell = [[Libra (constellation)\|Libra]]~~
	~~\| RA = {{RA\|15\|19\|26}}~~
	~~\| DEC = {{DEC\|−07\|43\|20}}~~
	~~\| app_mag = 10.55~~
	~~\| dist_ly = 20.3 ± 0.3~~
	~~\| dist_pc = 6.2 ± 0.1~~
	~~\| class = M3V~~
	}}
	~~{{Planetbox orbit~~
	\| period = 66.8 ± 0.14<ref name="mayor" /><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 = 0.22<ref name="mayor" />~~
	~~\| eccentricity = 0.38 ± 0.09<ref name="mayor" />~~
	~~\| arg_peri = 295 ± 28<ref name="udry" />~~
	~~\| semi_amp = 2.52 ± 0.17<ref name="udry" />~~
	~~\| t_peri = 2,452,936.9 ± 9.2<ref name="udry" />~~
	}}
	~~{{Planetbox character~~
	~~\| minimum_mass_earth = 7.09<ref name="mayor" />~~
	}}
	~~{{Planetbox discovery~~
	~~\| discovery_date = [[24 April]] [[2007]]~~
	~~\| discoverers = [[Stéphane Udry\|Udry]] et al.~~
	~~\| discovery_method = [[Radial velocity]]~~
	~~\| discovery_site = {{flag\|Chile}}~~
	~~\| discovery_status = Published<ref name=udry />~~
	}}
	~~{{Planetbox reference~~
	~~\| star=Gliese+581~~
	~~\| planet=d~~
	}}
	~~{{Planetbox end}}~~

	'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April		'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
	2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.		2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.

wikademia>Halojedi20: added source

2009-04-22T11:59:14Z

added source

← Older revision		Revision as of 11:59, 22 April 2009
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	== Climate and habitability ==		== Climate and habitability ==

	It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry, "d could be covered by a deep ocean; it is the first serious [[Ocean planet\|waterworld]] candidate. [...] Gliese 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star."<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>{{cite paper \|last=von Bloh \|first=W. \|authorlink= \|coauthors=''et al.'' \|year=2008 \|month= \|title=Habitability of Super-Earths: Gliese 581c and 581d \|journal= \|volume= \|issue= \|pages= \|id={{Arxiv\|0712.3219v4}} \|url= \|accessdate= \|quote= }}</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>		It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry, "d could be covered by a 'large and deep ocean'; it is the first serious [[Ocean planet\|waterworld]] candidate."<ref>http://www.google.com/hostednews/ap/article/ALeqM5g004fh_K-6Q4ebEceKWMDqEAiCagD97NCL9G0</ref> Gliese 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star."<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>{{cite paper \|last=von Bloh \|first=W. \|authorlink= \|coauthors=''et al.'' \|year=2008 \|month= \|title=Habitability of Super-Earths: Gliese 581c and 581d \|journal= \|volume= \|issue= \|pages= \|id={{Arxiv\|0712.3219v4}} \|url= \|accessdate= \|quote= }}</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>

	On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>		On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>

wikademia>Bender235: /* Climate and habitability */

2009-04-22T10:42:50Z

Climate and habitability

← Older revision		Revision as of 10:42, 22 April 2009
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	== Climate and habitability ==		== Climate and habitability ==

	It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry, "d could be covered by a deep ocean; it is the first serious [[Ocean planet\|waterworld]] candidate. [...] Gliese 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star."<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>~~http~~:~~//arxiv.org/abs/~~0712.3219v4</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>		It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry, "d could be covered by a deep ocean; it is the first serious [[Ocean planet\|waterworld]] candidate. [...] Gliese 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star."<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>{{cite paper \|last=von Bloh \|first=W. \|authorlink= \|coauthors=''et al.'' \|year=2008 \|month= \|title=Habitability of Super-Earths: Gliese 581c and 581d \|journal= \|volume= \|issue= \|pages= \|id={{Arxiv\|0712.3219v4}} \|url= \|accessdate= \|quote= }}</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>

	On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>		On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>

wikademia>Wurdnurd: /* Climate and habitability */ fmt

2009-04-22T09:38:43Z

Climate and habitability: fmt

← Older revision		Revision as of 09:38, 22 April 2009
Line 52:		Line 52:
	== Climate and habitability ==		== Climate and habitability ==

	It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry " d could be covered by a deep ocean, it is the first serious [[Ocean planet\|waterworld]] candidate.~~"“Gliese~~ 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star,” .<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>http://arxiv.org/abs/0712.3219v4</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>		It was originally thought that Gliese 581 d orbits outside the theoretical [[habitable zone]] of its star. Further studies released in April of 2009 confirmed that the planet is within the habitable zone where liquid water could exist. According to Stephan Udry, "d could be covered by a deep ocean; it is the first serious [[Ocean planet\|waterworld]] candidate. [...] Gliese 581 d is probably too massive to be made only of rocky material, but we can speculate that it is an icy planet that has migrated closer to the star."<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>{{cite journal\|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...476.1365V&db_key=AST&nosetcookie=1\|title=The Habitability of Super-Earths in Gliese 581\|author=von Bloh, W.; Bounama, C.; Cuntz, M.; Franck, S.\|journal=[[Astronomy & Astrophysics]]\|volume=476\|pages=1365 – 1371\|doi=10.1051/0004-6361:20077939\|accessdate=2008-08-18\|year=2007}}</ref> Scientists originally believed that Gliese 581 d would be too cold for [[liquid]] [[water]] to exist, and therefore could not support [[life]] in forms as existing on Earth. However, since Earth's temperature would be about -18°C<ref>{{cite web\|url=http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#q1 \|title=Global Warming Frequently Asked Questions \|publisher=Lwf.ncdc.noaa.gov \|date=2008-05-08 \|accessdate=2009-01-18}}</ref> 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.<ref>http://arxiv.org/abs/0712.3219v4</ref><ref>{{cite web\|url=http://www.centauri-dreams.org/?p=1625 \|title=Centauri Dreams » Blog Archive » Gliese 581d: A Habitable World After All? \|publisher=Centauri-dreams.org \|date=2007-12-13 \|accessdate=2009-01-18}}</ref><ref>{{cite web\|author=Posted at 12:06 AM in Space Exploration \|url=http://www.dailygalaxy.com/my_weblog/2007/06/another_super_e.html \|title=New 'Super Earth 2' Discovered in Constellation Libra \|publisher=Dailygalaxy.com \|date=2007-06-15 \|accessdate=2009-01-18}}</ref>

	On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>		On 21 April 2009, [[European Organisation for Astronomical Research in the Southern Hemisphere\|ESO]] announced, together with the discovery of [[Gliese 581 e]], that they had refined the models of Gliese 581 d's orbit, discovering it lay well within the habitable zone.<ref>{{cite web\|url=http://www.eso.org/public/outreach/press-rel/pr-2009/pr-15-09.html\|title=Lightest exoplanet yet discovered\|publisher=eso.org\|date=2009-04-21\|accessdate=2009-04-21}}</ref><ref name="mayor">{{cite journal \| url=http://obswww.unige.ch/~udry/Gl581_preprint.pdf\|author=Mayor et al.\|title=The HARPS search for southern extra-solar planets,XVIII. An Earth-mass planet in the GJ 581 planetary system \|journal =[[Astronomy and Astrophysics]] \|year=2009 }}</ref>

wikademia>Fusion7 at 07:40, 22 April 2009

2009-04-22T07:40:55Z

← Older revision		Revision as of 07:40, 22 April 2009
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	'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April		'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
	2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water could exist.		2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.
	== Discovery ==		== Discovery ==

wikademia>Fusion7: turned it back. My caption made the planetbox too big.

2009-04-22T07:39:40Z

turned it back. My caption made the planetbox too big.

← Older revision		Revision as of 07:39, 22 April 2009
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	{{Planetbox image		{{Planetbox image
	\| image = Gliese 581 d-v1.jpg		\| image = Gliese 581 d-v1.jpg
	\| caption = An artist's impression of Gliese 581 d and speculative moons~~. The image also reflects the possibility of water and life~~.		\| caption = An artist's impression of Gliese 581 d and speculative moons.
	}}		}}
	{{Planetbox star		{{Planetbox star

wikademia>Fusion7: caption

2009-04-22T07:38:24Z

caption

← Older revision		Revision as of 07:38, 22 April 2009
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	{{Planetbox image		{{Planetbox image
	\| image = Gliese 581 d-v1.jpg		\| image = Gliese 581 d-v1.jpg
	\| caption = An artist's impression of Gliese 581 d and speculative moons.		\| caption = An artist's impression of Gliese 581 d and speculative moons. The image also reflects the possibility of water and life.
	}}		}}
	{{Planetbox star		{{Planetbox star

wikademia>Alex contributing: linking first occurance of phrase

2009-04-22T05:45:02Z

linking first occurance of phrase

← Older revision		Revision as of 05:45, 22 April 2009
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	'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April		'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
	2009 new observations by the original discovery team concluded that the planet is within the habitable zone where liquid water could exist.		2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water could exist.
	== Discovery ==		== Discovery ==

← Older revision		Revision as of 05:13, 23 April 2009
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	~~{{Planetbox begin~~
	~~\| name = Gliese 581 d~~
	}}
	~~{{Planetbox image~~
	~~\| image = Gliese 581 d-v1.jpg~~
	~~\| caption = An artist's impression of Gliese 581 d and speculative moons.~~
	}}
	~~{{Planetbox star~~
	~~\| star = [[Gliese 581]]~~
	~~\| constell = [[Libra (constellation)\|Libra]]~~
	~~\| RA = {{RA\|15\|19\|26}}~~
	~~\| DEC = {{DEC\|−07\|43\|20}}~~
	~~\| app_mag = 10.55~~
	~~\| dist_ly = 20.3 ± 0.3~~
	~~\| dist_pc = 6.2 ± 0.1~~
	~~\| class = M3V~~
	}}
	~~{{Planetbox orbit~~
	\| period = 66.8 ± 0.14<ref name="mayor" /><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 = 0.22<ref name="mayor" />~~
	~~\| eccentricity = 0.38 ± 0.09<ref name="mayor" />~~
	~~\| arg_peri = 295 ± 28<ref name="udry" />~~
	~~\| semi_amp = 2.52 ± 0.17<ref name="udry" />~~
	~~\| t_peri = 2,452,936.9 ± 9.2<ref name="udry" />~~
	}}
	~~{{Planetbox character~~
	~~\| minimum_mass_earth = 7.09<ref name="mayor" />~~
	}}
	~~{{Planetbox discovery~~
	~~\| discovery_date = [[24 April]] [[2007]]~~
	~~\| discoverers = [[Stéphane Udry\|Udry]] et al.~~
	~~\| discovery_method = [[Radial velocity]]~~
	~~\| discovery_site = {{flag\|Chile}}~~
	~~\| discovery_status = Published<ref name=udry />~~
	}}
	~~{{Planetbox reference~~
	~~\| star=Gliese+581~~
	~~\| planet=d~~
	}}
	~~{{Planetbox end}}~~

	'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April		'''Gliese 581 d''' ({{pron-en\|ˈɡliːzə}}) is an [[extrasolar planet]] approximately 20 [[light-year]]s away in the [[constellation]] of [[Libra (constellation)\|Libra]]. Because of its mass, the planet is classified as a [[super-Earth]] planet. In late April
	2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.		2009 new observations by the original discovery team concluded that the planet is within the [[habitable zone]] where liquid water, and therefore, life, could exist.