0 Assigned ID: 1202 ----- Attempting Submission 1 (Fri Apr 07 23:57:23 GMT 2017) ----- This is the first submission for this program. It is very similar to our past long-term program on a similar topic: GO-13819, 14337, 14774. -2069002190 ----- Attempting Submission 1 (Mon Jul 17 03:58:30 GMT 2017) ----- The Coolest Sample of Brown Dwarf Dynamical Masses We propose a 3-year orbit monitoring program to measure the first dynamical masses for brown dwarfs below 1100 K. With projected separations of only 1-2 AU, our targets are among the tightest substellar visual binaries ever found and are amenable to orbit determinations within only a few years. When combined with our parallax determinations, these data will yield dynamical masses with <10% uncertainties. Our targets have been discovered at the limits of existing facilities and thus promise to be the only viable objects in this temperature regime (350-1000 K) for direct mass measurements during the JWST era. The goal of our observations is to obtain precise relative astrometry (~3-5 mas) for six brown dwarf binaries. Our data spanning 3 cycles will allow us to determine their orbits and thereby measure their dynamical masses. ACS/WFC enables a finer pixel scale than WFC3/IR and better sensitivity than WFC3/UVIS, both of which (high SNR, and better deblending of our tight 0.07"-0.11" binaries) are key to achieving our science goals. We use a standard 3-position dither sequence to guard against cosmic rays and to sample different parts of the detector in case our target lands on a bad pixel in a single pointing. We set the exposure times to fill the time available in each visit, which will yield SNR of ~30 for our faintest target (WISE0146, J=20.7) and will still be far from saturating any other of our sources in F850LP (the brightest is J=16.4). Stellar Physics Planets and Planet Formation 6 false false false false false false SUPPORTED STAR BROWN DWARF T J2000 J2000 J=20.7 mag STAR BROWN DWARF T J2000 J2000 J=18.2 mag STAR BROWN DWARF T J2000 J2000 J=17.1 mag STAR BROWN DWARF T J2000 J2000 z'(AB)=23.6 mag, J=19.7 mag STAR BROWN DWARF T J2000 J2000 J=16.4 mag STAR BROWN DWARF T J2000 J2000 J=16.9 mag The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP The scheduling data was generated by CASM 25.0. CASM was run in Phase I mode. ACS/WFC Imaging No No F850LP POS-TARG DITHER 3.011 LINE false false 3 85.28 ACS-WFC-DITHER-LINE 1 false /Users/tdupuy/Dropbox/proposals/hst25/OP-cache/Torbit-cy3-v01.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15270 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:33:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit1868966770621377458.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 15270 :visit-id "03" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:20:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3010 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3345 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit2154385154399843904.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15270 :visit-id "04" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:20:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2881 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3216 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit7414162441369842257.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15270 :visit-id "05" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:20:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3209 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit5699248406983720461.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15270 :visit-id "06" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:20:34.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2872 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3205 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit1818420173393055291.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15270 :visit-id "07" :proposal-version -1 :trans-version "20170613" :date "16-Jul-2017 22:20:34.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15270 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15270 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3211 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3546 :pcs-gap 0 ) true 1 0 /private/var/folders/t2/jm0h503x0jz1dw1bxxs798kw0000gn/T/OPVisit4433772405004315709.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 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