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- Exocomet abstract "An exocomet, or extrasolar comet, is a comet outside the Solar System, including interstellar comets and comets that orbit stars other than the Sun. The first exocomets were detected in 1987 around Beta Pictoris, a very young A-type main-sequence star. There are now a total of 11 stars around which the presence of exocomets have been observed or suspected.All discovered exocometary systems (Beta Pictoris, HR 10, 51 Ophiuchi, HR 2174, 49 Ceti, 5 Vulpeculae, 2 Andromedae, HD 21620, HD 42111, HD 110411, and more recently HD 172555) are around very young A-type stars.The exocomets are detected using spectroscopy when they transit their host stars. The transits of exocomets, like the transits of exoplanets, produce variations in the light received from the star. Changes are observed in the absorption lines of the stellar spectrum: the occultation of the star by the gas cloud coming from the exocomet produces additional absorption features, like those observed in the ionized calcium lines. The cometary gas comes from the evaporation of volatiles and dust ejected from the comet's nucleus heated when it comes close to the star.Observations of comets, and especially exocomets, provide important elements for understanding planet formation. Indeed, in the standard model of planet formation by accretion, planets are the result of the agglomeration of planetesimals, themselves formed by the coalescence of dust from the protoplanetary disk surrounding the star shortly after its formation. Thus, comets are the residuals of the volatile-rich planetesimals that remained in the planetary system without having been incorporated into the planets. They are considered fossil bodies that have seen the physical and chemical conditions prevailing at the time of planet formation.A gaseous cloud around 49 Ceti has been attributed to the collisions of comets in that planetary system.".
- Exocomet thumbnail NASA-ExocometsAroundBetaPictoris-ArtistView.jpg?width=300.
- Exocomet wikiPageExternalLink search.jsp?nasaInclude=%22extrasolar+comet%22.
- Exocomet wikiPageID "38170447".
- Exocomet wikiPageLength "6006".
- Exocomet wikiPageOutDegree "40".
- Exocomet wikiPageRevisionID "660984648".
- Exocomet wikiPageWikiLink 2_Andromedae.
- Exocomet wikiPageWikiLink 49_Ceti.
- Exocomet wikiPageWikiLink 51_Ophiuchi.
- Exocomet wikiPageWikiLink 5_Vulpeculae.
- Exocomet wikiPageWikiLink A-type_main-sequence_star.
- Exocomet wikiPageWikiLink Absorption_spectroscopy.
- Exocomet wikiPageWikiLink Beta_Pictoris.
- Exocomet wikiPageWikiLink Calcium.
- Exocomet wikiPageWikiLink Category:Articles_containing_video_clips.
- Exocomet wikiPageWikiLink Category:Comets.
- Exocomet wikiPageWikiLink Category:Exoplanetology.
- Exocomet wikiPageWikiLink Exomoon.
- Exocomet wikiPageWikiLink Exoplanet.
- Exocomet wikiPageWikiLink HD_110411.
- Exocomet wikiPageWikiLink HD_172555.
- Exocomet wikiPageWikiLink HD_21620.
- Exocomet wikiPageWikiLink HD_256.
- Exocomet wikiPageWikiLink HD_42111.
- Exocomet wikiPageWikiLink HR_10.
- Exocomet wikiPageWikiLink HR_2174.
- Exocomet wikiPageWikiLink Interstellar_comet.
- Exocomet wikiPageWikiLink Kepler_(spacecraft).
- Exocomet wikiPageWikiLink Light.
- Exocomet wikiPageWikiLink Nebular_hypothesis.
- Exocomet wikiPageWikiLink Planet.
- Exocomet wikiPageWikiLink Planet_formation.
- Exocomet wikiPageWikiLink Planetary_system.
- Exocomet wikiPageWikiLink Planetesimal.
- Exocomet wikiPageWikiLink Protoplanetary_disk.
- Exocomet wikiPageWikiLink Rogue_planet.
- Exocomet wikiPageWikiLink Solar_System.
- Exocomet wikiPageWikiLink Spectroscopy.
- Exocomet wikiPageWikiLink Star.
- Exocomet wikiPageWikiLink Stellar_classification.
- Exocomet wikiPageWikiLink Sun.
- Exocomet wikiPageWikiLink File:NASA-ExocometsAroundBetaPictoris-ArtistView.jpg.
- Exocomet wikiPageWikiLinkText "Exocomet".
- Exocomet wikiPageWikiLinkText "comet".
- Exocomet wikiPageWikiLinkText "exocomet".
- Exocomet align "center".
- Exocomet caption "Video – artist’s impression of exocomets orbiting the star Beta Pictoris.".
- Exocomet direction "horizontal".
- Exocomet hasPhotoCollection Exocomet.
- Exocomet image "Artist’s impression of exocomets around Beta Pictoris.ogg".
- Exocomet width "300".
- Exocomet wikiPageUsesTemplate Template:Asteroids.
- Exocomet wikiPageUsesTemplate Template:Citation_needed.
- Exocomet wikiPageUsesTemplate Template:Comets.
- Exocomet wikiPageUsesTemplate Template:Commons_category.
- Exocomet wikiPageUsesTemplate Template:Div_col.
- Exocomet wikiPageUsesTemplate Template:Div_col_end.
- Exocomet wikiPageUsesTemplate Template:Exoplanets.
- Exocomet wikiPageUsesTemplate Template:Multiple_image.
- Exocomet wikiPageUsesTemplate Template:Portal.
- Exocomet wikiPageUsesTemplate Template:Reflist.
- Exocomet wikiPageUsesTemplate Template:Wiktionary.
- Exocomet subject Category:Articles_containing_video_clips.
- Exocomet subject Category:Comets.
- Exocomet subject Category:Exoplanetology.
- Exocomet hypernym Comet.
- Exocomet type Planet.
- Exocomet comment "An exocomet, or extrasolar comet, is a comet outside the Solar System, including interstellar comets and comets that orbit stars other than the Sun. The first exocomets were detected in 1987 around Beta Pictoris, a very young A-type main-sequence star.".
- Exocomet label "Exocomet".
- Exocomet sameAs Eksokomeet.
- Exocomet sameAs Falling_Evaporating_Body.
- Exocomet sameAs Exocometa.
- Exocomet sameAs Exocomète.
- Exocomet sameAs Komet_luar_surya.
- Exocomet sameAs Exokomeet.
- Exocomet sameAs Eksokomet.
- Exocomet sameAs Egzokometa.
- Exocomet sameAs Exocometa.
- Exocomet sameAs m.0pkzvdk.
- Exocomet sameAs Exokomet.
- Exocomet sameAs Q2855300.
- Exocomet sameAs Q2855300.
- Exocomet sameAs 系外彗星.
- Exocomet wasDerivedFrom Exocomet?oldid=660984648.
- Exocomet depiction NASA-ExocometsAroundBetaPictoris-ArtistView.jpg.
- Exocomet isPrimaryTopicOf Exocomet.