| 词条 | Brown-dwarf desert |
| 释义 |
The brown-dwarf desert is a theorized range of orbits around a star on which brown dwarfs cannot exist as a companion object.[1] This is usually up to 5 AU around solar mass stars. The paucity of brown dwarfs in close orbits was first noted between 1998–2000 when a sufficient number of extrasolar planets had been found to perform statistical studies. Astronomers discovered there is a distinct shortage of brown dwarfs within 5 AU of the stars with companions, while there was an abundance of free-floating brown dwarfs being discovered. Subsequent studies have shown that brown dwarfs orbiting within 3–5 AU are found around less than 1% of stars with a mass similar to the Sun ({{Solar mass|link=y}}).[3] One of the many possible reasons for the existence of the desert relates to planetary (and brown dwarf) migration. If a brown dwarf were to form within 5 AU of its companion star, it could plausibly begin migrating inwards towards the central star and eventually fall into the star itself.{{Citation needed|date=January 2012}} That being said, the exact details of migration within a proto-planetary disk are not completely understood, and it is equally plausible that brown dwarf companions to FGK dwarfs would not undergo appreciable migration after their formation. A second possible reason is, depending on which formation paradigm is invoked, that a formation by core accretion should make the formation of higher mass brown dwarfs unlikely, as the gas accretion rate during runaway accretion onto high mass forming objects is reduced due to gap formation in the disk. The limited disk life time then truncates the mass range, limiting the maximum masses to approximately 10 Jupiter masses ({{Jupiter mass|link=y}}).[2] This effect might be somewhat mitigated by the fact that objects of {{Jupiter mass|3–5}} and above might excite eccentric perturbations in the disk, allowing for non-negligible mass accretion even in the presence of a gap.[3] Objects that form further outside (a>80 AU), where the disk is prone to gravitational instabilities, might be able to reach the masses required to cross the planet–brown dwarf threshold.[4] For these objects it might be unlikely to migrate into the inner regions of the disk, however, due to the long type-II migration timescale for massive objects in the brown dwarf mass regime.[5] References1. ^{{cite book | title = Planet Formation: Theory, Observations, and Experiments | author = Hubert Klahr and Wolfgang Brandner | publisher = Cambridge University Press | year = 2006 | isbn = 0-521-86015-6 | url = https://books.google.com/books?id=CukAzsJHQaQC&pg=RA5-PA241&dq=brown-dwarf-desert&lr=&as_brr=0&ei=d5a9R_-kBYmoiQHU9sXnCA&sig=w0aaVbMkwbPZ_28dUfKmOrt2nyQ }} [6]2. ^{{cite journal|last1=Lubow|first1=S. H.|last2=Seibert|first2=M.|last3=Artymowicz|first3=P.|title=Disk Accretion onto High‐Mass Planets|journal=The Astrophysical Journal|date=1999|volume=526|issue=2|pages=1001–1012|doi=10.1086/308045|arxiv = astro-ph/9910404 |bibcode = 1999ApJ...526.1001L }} 3. ^{{cite journal|last1=Kley|first1=W.|last2=Dirksen|first2=G.|title=Disk eccentricity and embedded planets|journal=Astronomy and Astrophysics|volume=447|issue=1|pages=369–377|doi=10.1051/0004-6361:20053914|arxiv = astro-ph/0510393 |bibcode = 2006A&A...447..369K }} 4. ^{{cite book|last1=authors|first1=edited by S. Seager ; with the assistance of Renée Dotson ; with 34 collaborating|title=Exoplanets|date=2010|publisher=University of Arizona Press|location=Tucson|isbn=978-0-8165-2945-2}} 5. ^{{cite journal|last1=Udry|first1=Stéphane|last2=Santos|first2=Nuno C.|title=Statistical Properties of Exoplanets|journal=Annual Review of Astronomy and Astrophysics|volume=45|issue=1|pages=397–439|doi=10.1146/annurev.astro.45.051806.110529|bibcode = 2007ARA&A..45..397U |arxiv=astro-ph/0306049}} 6. ^1 {{citation | display-authors=1 | last1=Kraus | first1=Adam L. | last2=Ireland | first2=Michael J. | last3=Martinache | first3=Frantz | last4=Lloyd | first4=James P. | title=Mapping the Shores of the Brown Dwarf Desert. I. Upper Scorpius | journal=The Astrophysical Journal | volume=679 | issue=1 | pages=762–782 |date=May 2008 | doi=10.1086/587435 | bibcode=2008ApJ...679..762K |arxiv = 0801.2387 }} }} 3 : Stellar astronomy|Brown dwarfs|Binary stars |
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