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Title: WISE J163940.83-684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING

Abstract

We have used methane imaging techniques to identify the near-infrared counterpart of the bright Wide-field Infrared Survey Explorer (WISE) source WISE J163940.83-684738.6. The large proper motion of this source ( Almost-Equal-To 3.''0 yr{sup -1}) has moved it, since its original WISE identification, very close to a much brighter background star-it currently lies within 1.''5 of the J = 14.90 {+-} 0.04 star 2MASS 16394085-6847446. Observations in good seeing conditions using methane-sensitive filters in the near-infrared J band with the FourStar instrument on the Magellan 6.5 m Baade telescope, however, have enabled us to detect a near-infrared counterpart. We have defined a photometric system for use with the FourStar J2 and J3 filters, and this photometry indicates strong methane absorption, which unequivocally identifies it as the source of the WISE flux. Using these imaging observations we were then able to steer this object down the slit of the Folded-port Infrared Echellette spectrograph on a night of 0.''6 seeing, and so obtain near-infrared spectroscopy confirming a Y0-Y0.5 spectral type. This is in line with the object's near-infrared-to-WISE J3 - W2 color. Preliminary astrometry using both WISE and FourStar data indicates a distance of 5.0 {+-} 0.5 pc and a substantial tangential velocitymore » of 73 {+-} 8 km s{sup -1}. WISE J163940.83-684738.6 is the brightest confirmed Y dwarf in the WISE W2 passband and its distance measurement places it among the lowest luminosity sources detected to date.« less

Authors:
;  [1];  [2]; ; ;  [3];  [4];  [5]
  1. Department of Astrophysics, School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
  2. Department of Astronomy, University of Chile, Camino El Observatorio 1515, Casilla 36-D, Santiago (Chile)
  3. Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547 (United States)
  5. Department of Physics and Astronomy, MS 111, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606-3328 (United States)
Publication Date:
OSTI Identifier:
22086439
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTROSCOPY; ASTRONOMY; ASTROPHYSICS; COLOR; COSMOLOGY; DISTANCE; DWARF STARS; INFRARED SPECTRA; INFRARED SURVEYS; LUMINOSITY; METHANE; NEAR INFRARED RADIATION; PHOTOMETRY; PROPER MOTION; TELESCOPES

Citation Formats

Tinney, C. G., Salter, Graeme, Faherty, Jacqueline K., Kirkpatrick, J. Davy, Gelino, Christopher R., Griffith, Roger L., Wright, Edward L., and Cushing, Michael C., E-mail: c.tinney@unsw.edu.au. WISE J163940.83-684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/60.
Tinney, C. G., Salter, Graeme, Faherty, Jacqueline K., Kirkpatrick, J. Davy, Gelino, Christopher R., Griffith, Roger L., Wright, Edward L., & Cushing, Michael C., E-mail: c.tinney@unsw.edu.au. WISE J163940.83-684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING. United States. doi:10.1088/0004-637X/759/1/60.
Tinney, C. G., Salter, Graeme, Faherty, Jacqueline K., Kirkpatrick, J. Davy, Gelino, Christopher R., Griffith, Roger L., Wright, Edward L., and Cushing, Michael C., E-mail: c.tinney@unsw.edu.au. Thu . "WISE J163940.83-684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING". United States. doi:10.1088/0004-637X/759/1/60.
@article{osti_22086439,
title = {WISE J163940.83-684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING},
author = {Tinney, C. G. and Salter, Graeme and Faherty, Jacqueline K. and Kirkpatrick, J. Davy and Gelino, Christopher R. and Griffith, Roger L. and Wright, Edward L. and Cushing, Michael C., E-mail: c.tinney@unsw.edu.au},
abstractNote = {We have used methane imaging techniques to identify the near-infrared counterpart of the bright Wide-field Infrared Survey Explorer (WISE) source WISE J163940.83-684738.6. The large proper motion of this source ( Almost-Equal-To 3.''0 yr{sup -1}) has moved it, since its original WISE identification, very close to a much brighter background star-it currently lies within 1.''5 of the J = 14.90 {+-} 0.04 star 2MASS 16394085-6847446. Observations in good seeing conditions using methane-sensitive filters in the near-infrared J band with the FourStar instrument on the Magellan 6.5 m Baade telescope, however, have enabled us to detect a near-infrared counterpart. We have defined a photometric system for use with the FourStar J2 and J3 filters, and this photometry indicates strong methane absorption, which unequivocally identifies it as the source of the WISE flux. Using these imaging observations we were then able to steer this object down the slit of the Folded-port Infrared Echellette spectrograph on a night of 0.''6 seeing, and so obtain near-infrared spectroscopy confirming a Y0-Y0.5 spectral type. This is in line with the object's near-infrared-to-WISE J3 - W2 color. Preliminary astrometry using both WISE and FourStar data indicates a distance of 5.0 {+-} 0.5 pc and a substantial tangential velocity of 73 {+-} 8 km s{sup -1}. WISE J163940.83-684738.6 is the brightest confirmed Y dwarf in the WISE W2 passband and its distance measurement places it among the lowest luminosity sources detected to date.},
doi = {10.1088/0004-637X/759/1/60},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}