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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, approximately 0.08 solar masses, at which a star can sustain hydrogen fusion. 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 wikiPageRevisionID "598785323".
- Substellar_object hasPhotoCollection Substellar_object.
- Substellar_object subject Category:Brown_dwarfs.
- Substellar_object subject Category:Substellar_objects.
- Substellar_object type BrownDwarfs.
- Substellar_object type CausalAgent100007347.
- Substellar_object type Dwarf110040344.
- Substellar_object type LivingThing100004258.
- Substellar_object type Object100002684.
- Substellar_object type Organism100004475.
- Substellar_object type Person100007846.
- Substellar_object type PhysicalEntity100001930.
- Substellar_object type SmallPerson110613505.
- Substellar_object type Whole100003553.
- Substellar_object type YagoLegalActor.
- Substellar_object type YagoLegalActorGeo.
- Substellar_object comment "A substellar object, sometimes called a substar, is an astronomical object whose mass is smaller than the smallest mass, approximately 0.08 solar masses, at which a star can sustain hydrogen fusion.".
- Substellar_object label "Objet substellaire".
- Substellar_object label "Objeto subestelar".
- Substellar_object label "Oggetto substellare".
- Substellar_object label "Substellar object".
- Substellar_object label "亚恒星".
- Substellar_object label "準恒星".
- Substellar_object sameAs Objet_substellaire.
- Substellar_object sameAs Oggetto_substellare.
- Substellar_object sameAs 準恒星.
- Substellar_object sameAs Objeto_subestelar.
- Substellar_object sameAs m.03c1fyx.
- Substellar_object sameAs Q3132741.
- Substellar_object sameAs Q3132741.
- Substellar_object sameAs Substellar_object.
- Substellar_object wasDerivedFrom Substellar_object?oldid=598785323.
- Substellar_object depiction New_Cool_Starlet_in_Our_Backyard.jpg.
- Substellar_object isPrimaryTopicOf Substellar_object.
