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- GD_61 abstract "GD 61 is a white dwarf with a planetary system located 150 light-years from Earth in the constellation Perseus. It is thought to have been a main-sequence star of spectral type A0V with around three times the mass of the Sun that has aged and passed through a red-giant phase, leaving a dense, hot remnant that has around 70% of the Sun's mass and a surface temperature of 17280 K. It is thought to be around 600 million years old, including both its life as a main-sequence star and white dwarf stellar remnant. It has an apparent magnitude of 14.8. GD 61 was first noted as a potential degenerate star in 1965, in a survey of white-dwarf suspects by astronomers from the Lowell Observatory in Arizona.In 2013, a circumstellar disk that resulted from the destruction of a water-rich asteroid was detected in close orbit around GD 61, which makes this the first detection of solid or liquid water on an extrasolar body. This asteroid would originally have been 26% water by mass, close to the water content of Ceres. This evidence suggests that a planet, with a rocky surface similar to Earth's, may have existed in the past, with the asteroid thus being an artifact from this period, now possibly part of a debris field from the hypothetical planet's breakup. Such a planet would have had both a rocky surface and water, two key ingredients for life. The researchers used the Cosmic Origins Spectrograph on the Hubble Space Telescope to determine the elemental composition. The elements magnesium, silicon, iron, and oxygen were detected, all components of rocky planets, although the levels of oxygen were much higher than what could be accounted for. The lack of associated carbon left only one candidate for the oxygen excess—water.".
- GD_61 thumbnail Artist's_view_of_watery_asteroid_in_white_dwarf_star_system_GD_61.jpg?width=300.
- GD_61 wikiPageID "40776581".
- GD_61 wikiPageRevisionID "596556237".
- GD_61 appmagV "14.8".
- GD_61 constell Perseus_(constellation).
- GD_61 name "GD 61".
- GD_61 names "2".
- GD_61 type "DBZ".
- GD_61 subject Category:Asteroids.
- GD_61 subject Category:Astrobiology.
- GD_61 subject Category:Astronomical_objects_discovered_in_2013.
- GD_61 subject Category:Exoplanet_candidates.
- GD_61 subject Category:Perseus_(constellation).
- GD_61 subject Category:Water.
- GD_61 subject Category:White_dwarfs.
- GD_61 comment "GD 61 is a white dwarf with a planetary system located 150 light-years from Earth in the constellation Perseus. It is thought to have been a main-sequence star of spectral type A0V with around three times the mass of the Sun that has aged and passed through a red-giant phase, leaving a dense, hot remnant that has around 70% of the Sun's mass and a surface temperature of 17280 K.".
- GD_61 label "GD 61".
- GD_61 label "GD 61".
- GD_61 label "GD 61".
- GD_61 label "GD 61".
- GD_61 sameAs GD_61.
- GD_61 sameAs GD_61.
- GD_61 sameAs m.0y7vsbs.
- GD_61 sameAs Q5872807.
- GD_61 sameAs Q5872807.
- GD_61 wasDerivedFrom GD_61?oldid=596556237.
- GD_61 depiction Artist's_view_of_watery_asteroid_in_white_dwarf_star_system_GD_61.jpg.
- GD_61 isPrimaryTopicOf GD_61.
