DENIS-P J1228.2−1547

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]

DENIS-P J1228.2-1547
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[3] mas
Distance66 ± 3 ly
(20.2 ± 0.8 pc)
Other designations
DENIS J1228.2-1547, 2MASS J12281523-1547342, 2MUCD 11073
Database references
SIMBADdata

History of observations

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 Martín and colleagues using near-infrared camera NICMOS on Hubble Space Telescope. It was announced in 1999.[7]

See also

The other two free-floating L dwarfs, detected by Delfosse et al. and announced in 1997:[6]

A free-floating L dwarf, detected by Kirkpatrick et al., announced also in 1997, but earlier:[8]

  • 2MASP J0345432+254023

A free-floating L dwarf, detected by Ruiz et al., announced also in 1997, but later:[9]

References
  1. Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. "DENIS-P J1228.2-1547". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2016.
  3. 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.
  4. 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.
  5. 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.
  6. Delfosse, X.; Tinney, C. G.; Forveille, T.; Epchtein, N.; Bertin, E.; Borsenberger, J.; Copet, E.; de Batz, B.; Fouque, P.; Kimeswenger, S.; Le Bertre, T.; Lacombe, F.; Rouan, D.; Tiphene, D. (1997). "Field brown dwarfs found by DENIS". Astronomy and Astrophysics. 327: L25–L28. Bibcode:1997A&A...327L..25D.
  7. Martín, E. L.; Brandner, W.; Basri, G. (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.
  8. 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.
  9. 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.
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