11-May-2007: Initial submission by co-I David Golimowski. Please copy acknowledgment to dag@pha.jhu.edu
18-May-2007: Revised submission by co-I David Golimowski, reflecting the following changes:
* Eliminated the faintest target 2MASS2101+1756AB, and reallocated the 2 orbits to SDSS1021-03AB and SDSS1534+16.
* Reduced observations of EPS-IND-BAB and 2M0850+10AB from 2 to 1 orbits, and reallocated the 2 orbits to 2M1728+3948AB and SDSS2052-16.
* Changed filter from F113N to F108N for 8 targets (2M0518-28AB, GL-337CD, 2M0920+3517AB, SDSS1052+44, SDSS1021-03AB, SDSS1534+16, 2M1728+3948AB, SDSS2052-16) that are observed in only one narrow-band filter. Both filters were declared in the Phase I proposal and approved by the TAC.
* Adjusted exposure times for all targets to allow S/N~20-30 per exposure in all filters.
* Dropped narrow-band (F108N) exposures of 2M0850+10AB because of insufficient S/N.
* Expanded dither step for EPS-IND-BAB from 1".304 to 2".164 to accommodate 0".7 binary separation.
----- Attempting Submission 1 (Fri May 11 19:58:29 GMT 2007) -----
Phase II Proposal 11136 (11136) successfully submitted.
----- Attempting Submission 2 (Fri May 18 13:54:48 GMT 2007) -----
Assigned ID: 192
----- Attempting Submission 1 (Thu Jan 25 18:58:46 HST 2007) -----
Phase I Proposal 192 (apt-LTbinaries) successfully submitted.
----- Attempting Submission 4 (Thu Jan 25 19:12:02 HST 2007) -----
Phase I Proposal 192 (apt-LTbinaries) successfully submitted.
----- Attempting Submission 5 (Fri Jan 26 05:34:46 HST 2007) -----
Phase I Proposal 192 (apt-LTbinaries) successfully submitted.
----- Attempting Submission 6 (Fri Jan 26 06:34:02 HST 2007) -----
Phase I Proposal 192 (apt-LTbinaries) successfully submitted.
----- Attempting Submission 7 (Fri Jan 26 07:08:51 HST 2007) -----
Phase I Proposal 192 (apt-LTbinaries) successfully submitted.
----- Attempting Submission 8 (Fri Feb 09 14:47:28 HST 2007) -----
Resolving Ultracool Astrophysics with Brown Dwarf Binaries
We propose to obtain resolved far-red and near-IR photometry of 13 brown dwarf binaries with HST/NICMOS in order to study one of the long-standing puzzles in ultracool astrophysics, namely the rapid change in spectra from L dwarfs to T dwarfs at nearly constant effective temperature (a.k.a. the "L/T transition''). While many nearby brown dwarfs have been studied, use of such samples is inevitably hindered by the unknown ages, masses, and metallicities of the field population. Characterization of resolved ultracool binaries is a promising avenue for addressing this problem, by providing coeval systems of the same composition with comparable masses and temperatures. Our proposed HST/NICMOS (0.9-1.6 micron) observations will be combined with longer wavelength ground-based photometry and spectroscopy from Keck laser guide star adaptive optics. The resulting multiband (0.9-2.5 micron) dataset will be a unique resource for measuring the evolution of spectral energy distributions across the L/T transition, to test state-of-the-art atmospheric models, and to determine the physical process(es) that dominate the L/T transition. Understanding the L/T transition is important not only for testing brown dwarf atmospheres, but also provides a key pathway for understanding the same physical effects, namely the formation and removal of clouds, in the atmospheres of the extrasolar planets.
We will obtain multiband photometry of 13 L/T transition binaries using NIC1. Ten of these binaries have projected separations < 0".2, and three have separations of 0".3-0".7, so NIC1's pixel scale and field of view are sufficient to resolve the binaries and to allow adequate dithering between exposures. This program comprises 13 visits of 1-3 orbits per visit, depending on the brightness of the targets. The targets are divided into 3 brightness categories, each having a characteristic set of filters, exposure times, and dither patterns. The integration times are chosen so that the binary components are imaged with S/N ~ 20-30 in each exposure. The dither offsets are 1".304 (30 1/3 pixels) for all targets except EPS-IND-BAB and GL-337CD, for which the offsets are 2".164 (50 1/3 pixels) and 1".734 (40 1/3 pixels), respectively. The 4 brightest targets (DENIS0205-1159, SDSS0423-04AB, EPS-IND-BAB, 2M2252-17) are imaged in 8 bands: F090M, F108N, F113N, F110M, F110W, F145M, F160W, and F170M. Two orbits are allocated to each target except EPS-IND-BAB, which is allocated one orbit. The 4 targets of intermediate brightness (2M0518-28AB, GL-337CD, 2M0920+3517AB, SDSS1052+44) are imaged in 7 bands: F090M, F108N, F110M, F110W, F145M, F160W, and F170M. Two orbits are allocated to each target. Four faint targets ( SDSS1021-03AB, SDSS1534+16, 2M1728+3948AB, SDSS2052-16) are imaged in the same 7 bands, but each are allocated 3 orbits. The faintest target, 2M0850+10AB, is imaged in 6 medium and broad bands (F090M, F110M, F110W, F145M, F160W, and F170M) over one orbit.
N/A
N/A
N/A
COOL STARS
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0.0
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/tmp/OPVisit60897.xml
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/home/dag/props/hst/cycle16/mliu/11136/OP-cache/11136-v10.xml
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/tmp/OPVisit60914.xml
/home/dag/props/hst/cycle16/mliu/11136/OP-cache/11136-v11.xml
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/tmp/OPVisit60914.xml
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true
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