ULAS J003402.77-005206.7 (also ULAS J0034-00) is a T9-type[4] brown dwarf in the constellation of Cetus.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 34m 02.771s[1] |
| Declination | −00° 52′ 06.78″[1] |
| Characteristics | |
| Spectral type | Y0[2] |
| Astrometry | |
| Parallax (π) | 79.6 ± 3.8 mas[3] |
| Distance | 41 ± 2 ly (12.6 ± 0.6 pc) |
| Details[2] | |
| Mass | 0.005–0.019 M☉ |
| Surface gravity (log g) | 4.0–4.5 cgs |
| Temperature | 550–600 K |
| Age | 0.1–2.0 Gyr |
| Database references | |
| SIMBAD | data |
| Other designations | |
ULAS J0034-00 is one of the coolest brown dwarfs known. It was first identified in data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS). Infrared spectra subsequently taken with the IRS instrument on the Spitzer Space Telescope give an estimated effective temperature of between 550 and 600 K and does not emit any visible light. Its mass is estimated at between 5 and 20 Jupiter masses and its age at between 0.1 and 2.0 billion years.[2]
References
edit- ^ a b c CFBDS J003402.77-005206.7 -- Brown Dwarf (M<0.08solMass), database entry, SIMBAD. Accessed on line June 24, 2009.
- ^ a b c Leggett, Sandy K.; Cushing, Michael C.; Saumon, Didier; Marley, Mark S.; Roellig, Thomas L.; Warren, Stephen J.; Burningham, Ben; Jones, Hugh R. A.; Kirkpatrick, J. Davy; Lodieu, Nicolas; Lucas, Philip W.; Mainzer, Amy K.; Martín, Eduardo L.; McCaughrean, Mark J.; Pinfield, David J.; Sloan, Gregory C.; Smart, Richard L.; Tamura, Motohide; Van Cleve, Jeffrey E. (2009). "The Physical Properties of Four ~600 K T Dwarfs". The Astrophysical Journal. 695 (2): 1517–1526. arXiv:0901.4093. Bibcode:2009ApJ...695.1517L. doi:10.1088/0004-637X/695/2/1517. S2CID 44050900.
- ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56. S2CID 18160586.
- ^ Suárez, Genaro; Metchev, Stanimir (2022-07-01). "Ultracool dwarfs observed with the Spitzer infrared spectrograph - II. Emergence and sedimentation of silicate clouds in L dwarfs, and analysis of the full M5-T9 field dwarf spectroscopic sample". Monthly Notices of the Royal Astronomical Society. 513 (4): 5701–5726. arXiv:2205.00168. Bibcode:2022MNRAS.513.5701S. doi:10.1093/mnras/stac1205. ISSN 0035-8711.
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