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Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer

Schneider, Adam C. and Cushing, Michael C. and Kirkpatrick, J. Davy and Gelino, Christopher R. and Mace, Gregory N. and Wright, Edward L. and Eisenhardt, Peter R. and Skrutskie, M. F. and Griffith, Roger L. and Marsh, Kenneth A. (2015) Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer. Astrophysical Journal, 804 (2). Art. No. 92. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150618-151011322

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Abstract

We present a sample of brown dwarfs identified with the Wide-field Infrared Survey Explorer (WISE) for which we have obtained Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) near-infrared grism spectroscopy. The sample (22 in total) was observed with the G141 grism covering 1.10–1.70 μm, while 15 were also observed with the G102 grism, which covers 0.90–1.10 μm. The additional wavelength coverage provided by the G102 grism allows us to (1) search for spectroscopic features predicted to emerge at low effective temperatures (e.g.,ammonia bands) and (2) construct a smooth spectral sequence across the T/Y boundary. We find no evidence of absorption due to ammonia in the G102 spectra. Six of these brown dwarfs are new discoveries, three of which are found to have spectral types of T8 or T9. The remaining three, WISE J082507.35+280548.5 (Y0.5), WISE J120604.38+840110.6 (Y0), and WISE J235402.77+024015.0 (Y1), are the 19th, 20th, and 21st spectroscopically confirmed Y dwarfs to date. We also present HST grism spectroscopy and reevaluate the spectral types of five brown dwarfs for which spectral types have been determined previously using other instruments.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/804/2/92DOIArticle
http://iopscience.iop.org/0004-637X/804/2/92/PublisherArticle
http://arxiv.org/abs/1502.05365arXivDiscussion Paper
ORCID:
AuthorORCID
Wright, Edward L.0000-0001-5058-1593
Additional Information:© 2015 American Astronomical Society. Received 2014 October 2; accepted 2015 February 18; published 2015 May 6. We wish to thank Caroline Morley and Didier Saumon for useful discussions regarding low-temperature models. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, and NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology. WISE and NEOWISE are funded by the National Aeronautics and Space Administration. This research has benefitted from the M, L, T, and Y dwarf compendium housed at dwarfarchives.org. This research has benefitted from the SpeX Prism Spectral Libraries, maintained by Adam Burgasser at http://pono.ucsd.edu/~adam/browndwarfs/spexprism. HST acknowledgement needed. We thank the STSCI help desk for useful discussions and resolution suggestions regarding WFC3 IR photometry. The authors wish to thank Caroline Morley for providing spectroscopic models via the webpage http://ucolick.org/~cmorley/cmorley/Models.html.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Subject Keywords:stars: low-mass; brown dwarfs
Issue or Number:2
Record Number:CaltechAUTHORS:20150618-151011322
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150618-151011322
Official Citation:Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer Adam C. Schneider et al. 2015 ApJ 804 92
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58354
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Jun 2015 17:06
Last Modified:03 Oct 2019 08:35

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