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Hubble Space Telescope spectroscopy of brown dwarfs discovered with the wide-field infrared survey explorer

Schneider, Adam C., Cushing, Michael C., Kirkpatrick, J. Davy, Gelino, Christopher R., Mace, Gregory N., Wright, Edward L., Eisenhardt, Peter R., Skrutskie, M. F., Griffith, Roger L. and Marsh, Kenneth 2015. Hubble Space Telescope spectroscopy of brown dwarfs discovered with the wide-field infrared survey explorer. The Astrophysical Journal 804 (2) , p. 92. 10.1088/0004-637X/804/2/92

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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
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: IOP Science
ISSN: 1538-4357
Last Modified: 15 Mar 2019 14:37

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