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Title:
Detection of NH3 in the near infrared spectrum of extremely cool brown dwarfs
Authors:
Delorme, P.; Delfosse, X.; Albert, L.; Artigau, E.; Forveille, T.; Reylé, C.; Allard, F.; Homeier, D.; Robin, A.
Affiliation:
AA(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, Université Joseph Fourier, CNRS, UMR 5571 Grenoble, France), AB(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, Université Joseph Fourier, CNRS, UMR 5571 Grenoble, France), AC(Canada-France-Hawaii Telescope Corporation, 65-1238 Mamaloha Highway, Kamuela, HI 96743, USA), AD(Gemini Observatory, Southern Operations Center, Association of Universities for Research in Astronomy, Inc., Casilla 603, La Serena, Chile), AE(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, Université Joseph Fourier, CNRS, UMR 5571 Grenoble, France), AF(Observatoire de Besançon, Institut UTINAM, University of Franche-Comté, CNRS-UMR 6213, BP 1615, 25010 Besançon Cedex, Franc), AG(Centre de Recherche Astrophysique de Lyon, UMR 5574: CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France), AH(Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany), AI(Observatoire de Besançon, Institut UTINAM, University of Franche-Comté, CNRS-UMR 6213, BP 1615, 25010 Besançon Cedex, Franc)
Publication:
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 513-516 (2009). (AIPC Homepage)
Publication Date:
02/2009
Origin:
AIP
PACS Keywords:
Charge-coupled devices, image detectors, and IR detector arrays, Low luminosity stars, subdwarfs, and brown dwarfs, Star formation
DOI:
10.1063/1.3099161
Bibliographic Code:
2009AIPC.1094..513D

Abstract

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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