Detection of NH3 in the near infrared spectrum of extremely cool brown dwarfs

Details Detection of NH3 in the near infrared spectrum of extremely cool brown dwarfs Detection of NH3 in the near infrared spectrum of extremely cool brown dwarfs

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..513d&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Physics

Charge-Coupled Devices, Image Detectors, And Ir Detector Arrays, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Star Formation

Scientific paper

We present the discovery of a probable ammonia absorption band in the near infrared spectra of CFBDS J005910.90011401.3 [1, hereafter CFBDS0059] and ULAS J003402.77005206.7 [2, hereafter ULAS0034]. These objects, along with the recently identified ULAS1335 [3] are the coolest known brown dwarfs and their spectra probe a hitherto unobserved effective temperature range.
The spectra of both CFBDS0059 and ULAS J0034 show absorption by a wide band on the blue side of the H band flux peak, which we attribute to ammonia. If, as we expect, that feature deepens further for still lower effective temperatures, its appearance would become a natural breakpoint for the transition between the T spectral class and the new Y spectral type.

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