0 Assigned ID: 2169 ----- Attempting Submission 1 (Fri Apr 09 19:48:46 GMT 2021) ----- HST Phase I Proposal 2169 successfully submitted. Receipt: # 2169-1 Updated dither pattern to 10 pixel dithers. 1153926684 ----- Attempting Submission 1 (Tue Jul 06 20:04:34 GMT 2021) ----- HST Phase II Proposal 16735 failed submission. ----- Attempting Submission 2 (Tue Jul 06 21:22:55 GMT 2021) ----- ----- Attempting Submission 3 (Wed Jul 07 15:06:32 GMT 2021) ----- HST Phase II Proposal 16735 successfully submitted. Receipt: # 16735-3 ----- Attempting Submission 4 (Wed Aug 18 15:27:11 GMT 2021) ----- Characterizing Cold Discoveries in the Sun's Backyard Characterizing the population of the coldest known free-floating substellar members of the solar neighborhood is now possible, giving us the opportunity to gain key insights into the efficiency of star formation at the lowest masses as well as the chemistry of high-pressure, low temperature atmospheres akin to cold, extrasolar giant planets. As individuals, each of these objects represents a unique probe into the complex chemistry present in the coldest photospheres produced in the Universe. We propose to obtain critical near-infrared F125W photometry of 12 newly discovered high proper motion, cold brown dwarfs in the solar neighborhood. The purpose of these observations is threefold: 1) to constrain each target's physical properties, 2) produce preliminary distance estimates, and 3) to provide the photometry and astrometry necessary to prepare for future spectroscopic observations. These observations will provide the vital reconnaissance needed for spectroscopic follow-up observations with HST or JWST. Cold brown dwarf candidates for this program were chosen by requiring a non-detections from either the UHS or VHS surveys, a non-detection at W1 from the CatWISE 2020 catalog (Marocco et al. 2020), and a total proper motion >400 mas/yr. Restricting to large proper motions ensures that an object is nearby - only 4 of the currently known Y dwarfs have total proper motions below this threshold. A non-detection at W1 ensures very red WISE W1 W2 colors, and a UHS/VHS non-detection assures a very red F125W-W2 color. These targets are listed in Table 1. We will use the WFC3 F125W filter to characterize each member of this sample by estimating their effective temperatures and spectral types, and providing preliminary distance estimates. Our observations are straightforward and have been proven successful by prior HST Y dwarf follow-up programs (e.g., Schneider et al. 2015, Bardalez-Gagliuffi et al. 2020). All observations will be carried out in MULTIACUUM mode using four dither positions. Reduced-gyro operations should have little impact on our program, which only requires single orbit visits that are not time-sensitive. Dr. Adam Schneider is an expert in characterizing the lowest-temperature brown dwarfs with HST (Schneider et al. 2015, 2016) and a co-founder of the Backyard Worlds: Planet 9 citizen science project. Dr. Schneider will take responsibility for the execution of this program and will lead the data analysis and resulting publications. Dr. Jackie Faherty is an expert in brown dwarf characterization studies. She is also a co-founder of the citizen science project Backyard Worlds: Planet 9, a CatWISE team member and the PI of a significant amount of Spitzer Space Telescope data that is critical to the targets proposed herein. Dr. Daniella Bardalez-Gagliuffi is a brown dwarf expert and is leading the data analysis and publication efforts for a Cycle 25 mid-cycle HST proposal devoted to 5 BYW cold brown dwarf candidates. Dr. J. Davy Kirkpatrick helped define the Y dwarf spectral classification scheme and has authored or co- authored numerous papers on these cold compact objects. He is leading the CatWISE effort to find previously undiscovered, cold brown dwarfs, and performed the Spitzer photometry used to select the candidates in this proposal. Dr. Marc Kuchner is the PI of the Backyard Worlds: Planet 9 citizen science project and the Citizen Science Officer for NASA's Science Mission Directorate. Dr. Aaron Meisner is a co-founder of the Backyard Worlds: Planet 9 citizen science project and the principal investigator on a significant amount of the Spitzer follow-up time used to define this target sample. Dr. Federico Marocco has played a leading role in follow-up of cold Y dwarfs in the solar neighborhood from the BYW and CatWISE programs. He is the PI of HST Cycle 28 program 16243, to measure accurate parallaxes and photometry of 14 of those cold Y dwarfs. Dan Caselden is a citizen scientist who discovered or co-discovered many of the targets in this proposal. He is also the creator of the wiseview tool (byw.tools/wiseview-v2), used to vet targets for the BYW and CatWISE projects. Stellar Physics and Stellar Types Exoplanets and Exoplanet Formation 0 false false false false true false false false SUPPORTED STAR BROWN DWARF T J2000 J2000 W2=16.421 STAR BROWN DWARF T J2000 J2000 W2=16.590 STAR BROWN DWARF T J2000 J2000 W2=16.210 STAR BROWN DWARF T J2000 J2000 W2=16.333 STAR BROWN DWARF T J2000 J2000 W2=16.295 STAR BROWN DWARF T J2000 J2000 W2=16.201 STAR BROWN DWARF T J2000 J2000 W2=16.085 STAR BROWN DWARF T J2000 J2000 W2=16.059 STAR BROWN DWARF T J2000 J2000 W2=16.629 STAR BROWN DWARF T J2000 J2000 W2=16.230 STAR BROWN DWARF T J2000 J2000 W2=16.837 STAR BROWN DWARF T J2000 J2000 W2=16.744 WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F125W POS-TARG DITHER 1.3 WFC3-IR-DITHER-BOX-MIN 1.3 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit14958635547087708956.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0142+4146. (Tic-Visit :proposal-id 16735 :visit-id "01" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:14:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit3856903455982006902.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0246-4626. (Tic-Visit :proposal-id 16735 :visit-id "02" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit117400788832487099.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0247+2740. (Tic-Visit :proposal-id 16735 :visit-id "03" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit2315879823631710288.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0319+5221. (Tic-Visit :proposal-id 16735 :visit-id "04" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:44.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit3257077109728426424.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0919-5743. (Tic-Visit :proposal-id 16735 :visit-id "05" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3389 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit10798681874546708460.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W0947+3846. (Tic-Visit :proposal-id 16735 :visit-id "06" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit11120865209759673972.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W1042+3321. (Tic-Visit :proposal-id 16735 :visit-id "07" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "07" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit16622948318038572906.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W1501+5549. (Tic-Visit :proposal-id 16735 :visit-id "08" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "08" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3389 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit15361794474955485420.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W1857-5822. (Tic-Visit :proposal-id 16735 :visit-id "09" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:18:58.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "09" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3389 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit3830020748440206331.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W1943-2122. (Tic-Visit :proposal-id 16735 :visit-id "10" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:19:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "10" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3157 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit12167324710232058473.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W2054+5821. (Tic-Visit :proposal-id 16735 :visit-id "11" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:19:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "11" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2843 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3389 :pcs-gap 0 ) true 1 0 /private/var/folders/s2/rb12t9yn1db5ctvyf93dnb0r0000gn/T/OPVisit17662434341144255748.xml The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. F125W observation of W2322-7907. (Tic-Visit :proposal-id 16735 :visit-id "12" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 08:19:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1114160 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16735 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16735 :visit-id "12" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3043 :al-overhead-at-end 0 :internal-dur-at-end 538 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3519 :pcs-gap 0 ) true 1 0