Bulletin of the American Physical Society
2018 Annual Meeting of the APS Four Corners Section
Volume 63, Number 16
Friday–Saturday, October 12–13, 2018; University of Utah, Salt Lake City, Utah
Session G01: Poster Session
5:00 PM,
Friday, October 12, 2018
CSC
Room: 205/206
Chair: David Kieda, University of Utah
Abstract ID: BAPS.2018.4CS.G01.11
Abstract: G01.00011 : Evidence for a High Altitude Haze on Brown Dwarf*
Presenter:
Melania Pena
(Utah Valley University)
Authors:
Melania Pena
(Utah Valley University)
Caitlin Murphy
(Utah Valley University)
Jacqueline Radigan
(Utah Valley University)
Timothy Doyle
(Utah Valley University)
Brown dwarfs are celestial objects with masses between those of large planets and small stars, that emit primarily infrared radiation. Unlike main sequence stars, brown dwarfs cannot reach high enough temperatures to conduct nuclear fusion within their cores. As a result, brown dwarfs have surface temperatures below 2200 K, at which point silicate clouds can form in their atmospheres. We present overlapping Hubble Space Telescope (HST; Wide Field Camera 3) and Spitzer Space Telescope observations of a variable brown dwarf with patchy silicate clouds in its atmosphere. The brown dwarf varies in brightness as it rotates, with an amplitude of ~5% from 1.1-1.7 microns (HST), and ~2.5% at 3.6-microns (Spitzer). Using a Mie-scattering model we determined that a lognormal distribution of sub-micron size grains at a high altitude in the atmosphere can approximately reproduce the observed variations at all wavelengths.
*Support for Program number GO-14051 was provided by NASA contract NAS5-26555 Support for the Spitzer observations presented in this work was provided by NASA through an award issued by JPL/Caltech. This research is supported in part by the Utah NASA Space Grant Consortium.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.4CS.G01.11
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