| 词条 | G 196-3 |
| 释义 |
| name=G 196-3}}{{Starbox observe | epoch=J2000 | ra={{RA|10|04|21.49}} | dec={{DEC|−21|50|37.8}} | appmag_v=13.3 | constell=Ursa Major}}{{Starbox character | class=M3V | b-v=+1.16 | u-b=+1.67 | variable=}}{{Starbox astrometry | radial_v=11.7 | prop_mo_ra=–127.00 | prop_mo_dec=–183.00 | parallax= | p_error= | parallax_footnote= | absmag_v=13.33}} {{Starbox catalog Substellar companionObservations of the substellar object were performed on January 25, 1998 where a faint red companion was present 16.2 arc seconds southwest of the star. A comparison of images taken at different wavelengths was done using low-intermediate-resolution spectroscopy confirmed the presence of a substellar object which was named G 196-3B. The Further observations confirmed the discovery when the team of Rafael Rebolo obtained R & I broadband photometry on March 19, 1998. The TCS Telescope showed its very cool nature in near-infrared (K Band). The comparison of the optical and infrared magnitudes including dust condensation has allowed astronomers to conclude that the substellar object was 25–10+15 Jupiter masses or simply 25 masses that of the Jovian-planet Jupiter. This was the second[5][6] discovery of a brown dwarf that was found around a low-mass star whose age[7] was relatively young. The separation of the star and the substellar object has suggested that both were parts of a fragment from a collapsing cloud although another possible scenario suggests that it originated from a dissipated protoplanetary disk.[8][1][9][10][11][12] {{OrbitboxPlanet begin}}{{OrbitboxPlanet| exoplanet = B | mass = ≥25 | semimajor = 1.186 | period = 280 | eccentricity = 0.120 }}{{Orbitbox end}} See also
References1. ^1 {{cite journal|doi=10.1126/science.282.5392.1309|journal=Science|volume=282|issue=5392|page=1309|title=Discovery of a Low-Mass Brown Dwarf Companion of the Young Nearby Star G 196-3 |arxiv=astro-ph/9811413|author= Rafael Rebolo|display-authors= etal|date=1998|bibcode = 1998Sci...282.1309R }} {{Stars of Ursa Major}}2. ^{{cite journal|title=Low-Luminosity Companions to Nearby Stars: Status of the 2MASS Data Search; Ultracool Dwarfs: New Spectral Types L and T. Edited by Hugh R. A. Jones and Iain A. Steele. Berlin Heidelberg: Springer| bibcode= 2001udns.conf..125K|author1=Kirkpatrick|first1=J. D.|last2=Gizis|first2=J. E.|last3=Burgasser|first3=A. J.|last4=Wilson|first4=J. C.|last5=Dahn|first5=C. C.|last6=Monet|first6=D. G.|last7=Reid|first7=I. N.|last8=Liebert|first8=J.|date=2001|pages=125}} 3. ^{{cite simbad|title=G 196-3| access-date=2010-02-18}} 4. ^{{cite web|title=Lowell Proper Motion Survey 8991 Northern Stars (Giclas 1971) ReadMe| url=http://vizier.u-strasbg.fr/viz-bin/VizieR-S?G%20196-3A|work=Centre de Donnes Astronomiques|accessdate=2010-02-09}} 5. ^{{cite web|title=G196-3B : the second discovery of a brown dwarf around a low-mass star| url=http://www.iac.es/telescopes/cain/cain_resultados.html#G196-3B%20:%20the%20second%20discovery%20of%20a%20brown%20dwarf%20around%20a%20low-ma|work=Instituto de Astrofísica de Canarias (IAC)|accessdate=2010-02-22}} 6. ^{{cite journal|title=Lithium in Brown Dwarfs |page=299| bibcode=2000IAUS..198..299R|author=R. Rebolo|journal=The Light Elements and their Evolution, Proceedings of IAU Symposium 198, held 22-26 Nov 1999, Natal, Brazil. Edited by L. da silva, R. de Medeiros, & M Spite, 2000|volume=198|date=2000}} 7. ^{{cite web|title=ING Scientific Highlights in 1998|url=http://www.ing.iac.es/PR/AR1998/high_98.html|work=Isaac Newton Group of Telescopes|accessdate=2010-02-18}} 8. ^{{cite web|title=Resultados más relevantes|url= http://www.iac.es/telescopes/cain/cain_resultados.html| work=IAC|accessdate=2010-02-18}} 9. ^{{cite web|title=196-3B |url=http://www.extrasolar.net/planettour.asp?StarCatID=browndwarf&PlanetID=98 |work=ExtraSolar.net |accessdate=2010-02-18 |deadurl=yes |archiveurl=https://web.archive.org/web/20100921160746/http://extrasolar.net/planettour.asp?StarCatID=browndwarf&PlanetID=98 |archivedate=2010-09-21 |df= }} 10. ^{{cite journal|doi= 10.1086/379849|last1= McGovern|first1= Mark R.|last2= Kirkpatrick|first2= J. Davy|last3= McLean|first3= Ian S.|last4= Burgasser|first4= Adam J.|last5= Prato|first5= L.|last6= Lowrance|first6= Patrick J.|title= Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features|url= http://www.iop.org/EJ/article/0004-637X/600/2/1020/17726.text.html|journal= The Astrophysical Journal|volume=600|issue= 2|pages=1020–1024|date=2004|bibcode=2004ApJ...600.1020M|arxiv = astro-ph/0309634 }} 11. ^{{cite journal|title=Discovery of Young Dwarf L Binary|author1=Allers|author2=Liu|author3=Dupuy|author4=Cushing|date=2009|volume=715|issue=561|pages=561–571|journal=Astrophysical Journal|arxiv=0912.4687|bibcode = 2010ApJ...715..561A |doi = 10.1088/0004-637X/715/1/561 }} 12. ^{{cite simbad|title=2MASSW J1004207+502300|access-date=2010-02-18}} 2 : Ursa Major (constellation)|M-type main-sequence stars |
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