DENIS-P J1228.2-1547 is a system of two nearly equal brown dwarfs, both are of spectral types L5.5:,[4] located in constellation Corvus at approximately 20.2 parsecs or 66.0 light-years from Earth.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 28m 15.232s[1] |
| Declination | −15° 47′ 34.23″[1] |
| Characteristics | |
| Spectral type | L5.5 |
| Apparent magnitude (J) | 14.378[2] |
| Apparent magnitude (H) | 13.35[2] |
| Apparent magnitude (K) | 12.767[2] |
| Astrometry | |
| Parallax (π) | 49.40 ± 1.90 mas[3] |
| Distance | 66 ± 3 ly (20.2 ± 0.8 pc) |
| Other designations | |
DENIS J1228.2-1547, 2MASS J12281523-1547342, 2MUCD 11073 | |
| Database references | |
| SIMBAD | data |
History of observations edit
DENIS-P J1228.2-1547 is one on the first free-floating L dwarfs discovered. It was discovered in 1997 by Xavier Delfosse and colleagues from the DENIS survey.[6]
The second component (B) was discovered by Eduardo L. Martín and colleagues using near-infrared camera NICMOS on Hubble Space Telescope. It was announced in 1999.[7]
See also edit
The other two free-floating L dwarfs, detected by Delfosse et al. and announced in 1997:[6]
- Deep Near Infrared Survey of the Southern Sky
- DENIS-P J1058.7-1548
- DENIS-P J020529.0-115925
- DENIS-P J082303.1-491201 b
- DENIS-P J101807.5-285931
A free-floating L dwarf, detected by Kirkpatrick et al., announced also in 1997, but earlier:[8]
A free-floating L dwarf, detected by Ruiz et al., announced also in 1997, but later:[9]
References edit
- ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ a b c "DENIS-P J1228.2-1547". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2016.
- ^ Faherty, Jacqueline K. (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.
- ^ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement. 201 (2): 19. arXiv:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19. S2CID 119256363.
- ^ Dahn, C. C.; Harris, Hugh C.; Vrba, Frederick J.; Guetter, Harry H.; Canzian, Blaise; Henden, Arne A.; Levine, Stephen E.; Luginbuhl, Christian B.; Monet, Alice K. B.; Monet, David G.; Pier, Jeffrey R.; Stone, Ronald C.; Walker, Richard L.; Burgasser, Adam J.; Gizis, John E.; Kirkpatrick, J. Davy; Liebert, James; Reid, I. Neill (2002). "Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs". The Astronomical Journal. 124 (2): 1170–1189. arXiv:astro-ph/0205050. Bibcode:2002AJ....124.1170D. doi:10.1086/341646. S2CID 119485007.
- ^ a b Delfosse, Xavier; Tinney, Chris G.; Forveille, Thierry; Epchtein, Nicolas; Bertin, Emmanuel; Borsenberger, Jean; Copet, Éric; de Batz, Bertrand; Fouqué, Pascal; Kimeswenger, Stefan; Le Bertre, Thibaut; Lacombe, François; Rouan, Daniel; Tiphène, Didier (1997). "Field brown dwarfs found by DENIS". Astronomy and Astrophysics. 327: L25–L28. Bibcode:1997A&A...327L..25D.
- ^ Martín, Eduardo L.; Brandner, W.; Basri, Gibor (1999). "A Search for Companions to Nearby Brown Dwarfs: The Binary DENIS-P J1228.2-1547". Science. 283 (5408): 1718–1720. Bibcode:1999Sci...283.1718M. doi:10.1126/science.283.5408.1718. PMID 10073933.
- ^ Kirkpatrick, J. Davy; Beichman, Charles A.; Skrutskie, Michael F. (1997). "The Coolest Isolated M Dwarf and Other 2MASS Discoveries". The Astrophysical Journal. 476 (1): 311–318. Bibcode:1997ApJ...476..311K. doi:10.1086/303613.
- ^ Ruiz, Maria Teresa; Leggett, S. K.; Allard, France (1997). "Kelu-1: A Free-floating Brown Dwarf in the Solar Neighborhood". The Astrophysical Journal Letters. 491 (2): L107–L110. Bibcode:1997ApJ...491L.107R. doi:10.1086/311070.