| 词条 | WD 0806-661 |
| 释义 |
|name=WD 0806-661}}{{Starbox observe |epoch=J2000{{r|Simbad A}} |equinox=J2000{{r|Simbad A}} |constell=Volans |ra={{RA|08|06|53.736}}{{r|Simbad A}} |dec={{DEC|-66|18|16.74}}{{r|Simbad A}}}}{{Starbox character | class =DQ4.2{{r|Holberg2008}}{{r|Sion2009}} / Y?{{r|Rodriguez2011|Kirkpatrick2012}} | appmag_1_passband =B | appmag_1 =13.74{{r|Giammichele2012}} / - | appmag_2_passband =V | appmag_2 =13.71{{r|Giammichele2012}} / - | appmag_3_passband =R | appmag_3 =13.64{{r|Giammichele2012}} / - | appmag_4_passband =I | appmag_4 =13.60{{r|Giammichele2012}} / - | appmag_5_passband =J | appmag_5 =13.704 ± 0.023{{r|Simbad A}} / >23.9{{r|Luhman2012}} | appmag_6_passband =H | appmag_6 =13.739 ± 0.025{{r|Simbad A}} / - | appmag_7_passband =K | appmag_7 =13.781 ± 0.043{{r|Simbad A}} / - }}{{Starbox astrometry |prop_mo_ra=88.0 ± 2.8{{r|Simbad A}} |prop_mo_dec=139.9 ± 1.3{{r|Simbad A}} |parallax=52.17 |p_error=1.67 |parallax_footnote={{r|Subasavage2009}} |absmag_v=12.30{{r|Giammichele2012}} / -}}{{Starbox detail |component1=Component A |age_gyr=0.62{{r|Giammichele2012}}[1] |mass=0.58 ± 0.03{{r|Giammichele2012}} |gravity=8.00 ± 0.05{{r|Giammichele2012}} |temperature=10205 ± 390{{r|Giammichele2012}} |component2=Component B |mass_mj2=6–9{{r|Luhman2012}} |temperature2=300–345{{r|Luhman2012}}}}{{Starbox relpos | epoch = | primary = A | component = B | angdistsec = 130.2 ± 0.2 | angdistref = {{r|Luhman2011}} | posang = 104.2 ± 0.2 | posangref ={{r|Luhman2011}} | projsep = 2500 | projsepref = {{r|Luhman2011}}}}{{Starbox catalog |names=Component A: BPM 4834, LAWD 27, L 97-3, LTT 3059, NLTT 19008, WD 0806-661, WD 0806-66, GJ 3483, 2MASS J08065373-6618167, GSC 08936-01284, GEN# +6.00204834, uvby98 986097003, WG 12 Component B: WD 0806-661 B,{{r|Luhman2011|Luhman2012}} WD 0806-661B,{{r|Simbad B}} GJ 3483B{{r|Rodriguez2011}}}}{{Starbox reference | Simbad=GJ+3483 | EPE=WD+0806-661B}}{{Starbox end}} WD 0806-661 (L 97-3, GJ 3483) is a wide binary system of a white dwarf and a Y-type sub-brown dwarf (designated "B"), located in constellation Volans at 63 light-years from Earth. The companion was discovered in 2011. It has the largest actual (2500 AU) and apparent separation (more than 2 arcminutes) of any known planetary-mass object. DiscoveryComponent B was discovered in 2011 with Spitzer Space Telescope. Its discovery paper is Luhman et al., 2011. At the time of its discovery, WD 0806-661 B was the coldest "star" that has ever been found, with a temperature of only 27–80 °C, which is similar to some hot areas of Earth.{{r|Luhman2011}} See also
Notes1. ^White-dwarf cooling age, i.e. age as degenerate star (not including main-sequence lifetime). 2. ^{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WD%200806-661b | title=WD 0806-661B -- Brown Dwarf (M<0.08solMass) | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | accessdate=2012-06-19}} 3. ^{{cite journal | last=Holberg |first=J. B. |author2=Sion, E. M. |author3=Oswalt, T. |author4=McCook, G. P. |author5=Foran, S. |author6=Subasavage, John P. | year=2008 | title=A New Look at the Local White Dwarf Population | journal=The Astronomical Journal | volume=135 | issue=4 | pages=1225–1238 | bibcode=2008AJ....135.1225H | doi=10.1088/0004-6256/135/4/1225}} 4. ^{{cite journal | last=Sion |first=Edward M. |author2=Holberg, J. B. |author3=Oswalt, Terry D. |author4=McCook, George P. |author5=Wasatonic, Richard | year=2009 | title=The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics | journal=The Astronomical Journal | volume=138 | issue=6 | pages=1681–1689 | arxiv=0910.1288 | bibcode=2009AJ....138.1681S | doi=10.1088/0004-6256/138/6/1681}} 5. ^{{cite journal | last1=Subasavage |first1=J. P. | first2=W. C. | year=2009 | first3=T. J. | first4=P. | first5=P. | first6=P. A. | first7=E. | first8=R. A.|last2=Jao|last3=Henry|last4=Bergeron|last5=Dufour|last6=Ianna|last7=Costa|last8=Méndez | title=The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the 25 Parsec White Dwarf Sample | journal=The Astronomical Journal | volume=137 | issue=6 | pages=4547–4560 | arxiv=0902.0627 | bibcode=2009AJ....137.4547S | doi=10.1088/0004-6256/137/6/4547}} 6. ^{{cite journal | last=Luhman |first=K. L. |author2=Burgasser, A. J. |author3=Bochanski, J. J. | year=2011 | title=Discovery of a Candidate for the Coolest Known Brown Dwarf | journal=The Astrophysical Journal Letters | volume=730 | issue=1 | pages=L9 | arxiv=1102.5411 | bibcode=2011ApJ...730L...9L | doi=10.1088/2041-8205/730/1/L9}} 7. ^{{cite journal | last=Rodriguez |first=David R. |author2=Zuckerman, B. |author3=Melis, Carl |author4=Song, Inseok | year=2011 | title=The Ultra Cool Brown Dwarf Companion of WD 0806-661B: Age, Mass, and Formation Mechanism | journal=The Astrophysical Journal Letters | volume=732 | issue=2 | pages=L29 | arxiv=1103.3544 | bibcode=2011ApJ...732L..29R | doi=10.1088/2041-8205/732/2/L29}} 8. ^{{cite journal | authorlink=J. Davy Kirkpatrick | last1=Kirkpatrick | last2=Gelino |first1=J. D. | first2=C. R. | last3=Cushing | first3=M. C. | last4=Mace | first4=G. N. | last5=Griffith | first5=R. L. | last6=Skrutskie | first6=M. F. | last7=Marsh | first7=K. A. | last8=Wright | first8=E. L. | last9=Eisenhardt | first9=P. R. | last10=McLean | first10=I. S. | last11=Mainzer | first11=A. K. | last12=Burgasser | first12=A. J. | last13=Tinney | first13=C. G. | last14=Parker | first14=S. | last15=Salter | first15=G. | title=Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function | year=2012 | journal=The Astrophysical Journal | volume=753 | issue=2 | pages=156 | arxiv=1205.2122 | doi=10.1088/0004-637X/753/2/156 | bibcode=2012ApJ...753..156K}} 9. ^{{cite journal | last=Luhman |first=K. L. |author2=Burgasser, A. J. |author3=Labbé, I. |author4=Saumon, D. |author5=Marley, M. S. |author6=Bochanski, J. J. |author7=Monson, A. J. |author8=Persson, S. E. | year=2012 | title=Confirmation of One of the Coldest Known Brown Dwarfs | journal=The Astrophysical Journal | volume=744 | issue=2 | pages=135 | arxiv=1110.4353 | bibcode=2012ApJ...744..135L | doi=10.1088/0004-637X/744/2/135}} 10. ^{{cite journal | last1=Giammichele |first1=N. | last2=Bergeron | year=2012 | first2=P. | last3=Dufour | first3=P. | title=Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs | journal=The Astrophysical Journal Supplement | volume=199 | issue=2 | pages=29 | arxiv=1202.5581 | bibcode=2012ApJS..199...29G | doi=10.1088/0067-0049/199/2/29}} References}} External links
6 : Volans (constellation)|Binary stars|White dwarfs|Y-type stars|Gliese and GJ objects|2MASS objects |
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