Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Substellar_object> ?p ?o }
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- Substellar_object abstract "A substellar object, sometimes called a substar, is an astronomical object whose mass is smaller than the smallest mass at which hydrogen fusion can be sustained (approximately 0.08 solar masses). This definition includes brown dwarfs, former stars similar to EF Eridani B, and can also include objects of planetary mass, regardless of their formation mechanism and whether or not they are associated with a primary star.Assuming that a substellar object has a composition similar to the Sun's and at least the mass of Jupiter (approximately 10−3 solar masses), its radius will be comparable to that of Jupiter (approximately 0.1 solar radii). This is because the center of such a substellar object just below the hydrogen-burning limit is quite degenerate, with a density of ≈103 g/cm3, but this degeneracy lessens with decreasing mass until, at the mass of Jupiter, a substellar object has a central density less than 10 g/cm3. The density decrease balances the mass decrease, keeping the radius approximately constant.A substellar object with mass just below the hydrogen-fusing limit may ignite hydrogen fusion temporarily at its center, but although this will provide some energy, it will not be enough to overcome the object's ongoing gravitational contraction; likewise, although an object with mass above approximately 0.013 solar masses will be able to fuse deuterium for a time, this source of energy will be exhausted in approximately 106 to 108 years. Apart from these sources, the radiation of an isolated substellar object comes only from the release of its gravitational potential energy, which causes it to gradually cool and shrink. A substellar object in orbit about a star will shrink more slowly as it is kept warm by the star, evolving towards an equilibrium state where it emits as much energy as it receives from the star.".
- Substellar_object thumbnail New_Cool_Starlet_in_Our_Backyard.jpg?width=300.
- Substellar_object wikiPageID "13313000".
- Substellar_object wikiPageLength "3588".
- Substellar_object wikiPageOutDegree "24".
- Substellar_object wikiPageRevisionID "679815253".
- Substellar_object wikiPageWikiLink Astronomical_object.
- Substellar_object wikiPageWikiLink Brown_dwarf.
- Substellar_object wikiPageWikiLink Category:Brown_dwarfs.
- Substellar_object wikiPageWikiLink Category:Substellar_objects.
- Substellar_object wikiPageWikiLink Degenerate_matter.
- Substellar_object wikiPageWikiLink Density.
- Substellar_object wikiPageWikiLink Deuterium_burning.
- Substellar_object wikiPageWikiLink EF_Eridani.
- Substellar_object wikiPageWikiLink Gravitational_energy.
- Substellar_object wikiPageWikiLink Jupiter.
- Substellar_object wikiPageWikiLink Kelvin–Helmholtz_mechanism.
- Substellar_object wikiPageWikiLink Mass.
- Substellar_object wikiPageWikiLink Nuclear_fusion.
- Substellar_object wikiPageWikiLink Orbit.
- Substellar_object wikiPageWikiLink Planet.
- Substellar_object wikiPageWikiLink Radiative_equilibrium.
- Substellar_object wikiPageWikiLink Solar_mass.
- Substellar_object wikiPageWikiLink Solar_radius.
- Substellar_object wikiPageWikiLink Star.
- Substellar_object wikiPageWikiLink Sub-brown_dwarf.
- Substellar_object wikiPageWikiLink Sun.
- Substellar_object wikiPageWikiLink File:New_Cool_Starlet_in_Our_Backyard.jpg.
- Substellar_object wikiPageWikiLinkText "Substellar object".
- Substellar_object wikiPageWikiLinkText "substar".
- Substellar_object wikiPageWikiLinkText "substellar companions".
- Substellar_object wikiPageWikiLinkText "substellar mass".
- Substellar_object wikiPageWikiLinkText "substellar object".
- Substellar_object wikiPageWikiLinkText "substellar".
- Substellar_object wikiPageUsesTemplate Template:Reflist.
- Substellar_object subject Category:Brown_dwarfs.
- Substellar_object subject Category:Substellar_objects.
- Substellar_object type Object.
- Substellar_object type Redirect.
- Substellar_object type Concept.
- Substellar_object comment "A substellar object, sometimes called a substar, is an astronomical object whose mass is smaller than the smallest mass at which hydrogen fusion can be sustained (approximately 0.08 solar masses).".
- Substellar_object label "Substellar object".
- Substellar_object sameAs Q3132741.
- Substellar_object sameAs Objet_substellaire.
- Substellar_object sameAs גוף_תת-כוכבי.
- Substellar_object sameAs Oggetto_substellare.
- Substellar_object sameAs 亜恒星天体.
- Substellar_object sameAs Objeto_subestelar.
- Substellar_object sameAs m.03c1fyx.
- Substellar_object sameAs Q3132741.
- Substellar_object sameAs 亚恒星.
- Substellar_object wasDerivedFrom Substellar_object?oldid=679815253.
- Substellar_object depiction New_Cool_Starlet_in_Our_Backyard.jpg.
- Substellar_object isPrimaryTopicOf Substellar_object.