The Extremely Red, Young L Dwarf PSO J318.5338-22.8603: A Free-floating Planetary-mass Analog to Directly Imaged Young Gas-giant Planets

@article{Liu2013TheER,
  title={The Extremely Red, Young L Dwarf PSO J318.5338-22.8603: A Free-floating Planetary-mass Analog to Directly Imaged Young Gas-giant Planets},
  author={Michael C. Liu and Eugene. A. Magnier and Niall R. Deacon and Katelyn Allers and Trent J. Dupuy and Michael C. Kotson and Kimberly M. Aller and W. S. Burgett and K. C. Chambers and Peter W. Draper and Klaus W. Hodapp and Robert Jedicke and Rolf Peter Kudritzki and N. Metcalfe and Jeffrey S. Morgan and N. Kaiser and Paul A. Price and John L. Tonry and Richard J. Wainscoat},
  journal={The Astrophysical Journal},
  year={2013},
  volume={777}
}
We have discovered using Pan-STARRS1 an extremely red late-L dwarf, which has (J – K){sub MKO} = 2.78 and (J – K){sub 2MASS} = 2.84, making it the reddest known field dwarf and second only to 2MASS J1207–39b among substellar companions. Near-IR spectroscopy shows a spectral type of L7 ± 1 and reveals a triangular H-band continuum and weak alkali (K I and Na I) lines, hallmarks of low surface gravity. Near-IR astrometry from the Hawaii Infrared Parallax Program gives a distance of 24.6 ± 1.4 pc… 

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