Assigned ID: 947 ----- Attempting Submission 1 (Sat Feb 27 00:44:55 GMT 2010) ----- HST Phase I Proposal 947 (twa30.apt) successfully submitted. ----- Attempting Submission 1 (Fri Jul 09 15:30:59 GMT 2010) ----- Resolving Disks and Jets in a New, Benchmark Low-Mass Binary We propose to obtain high resolution imaging of two recently discovered TW Hydrae Association members, TWA 30A and B, which show clear spectroscopic evidence of accretion disks and outflows. With WFC3 imaging in three broad-band filters sampling forbidden emission lines, accretion signatures and scattered light, we will measure or constrain the physical extent and grain size of the circumstellar disks around these sources, the masses of the jets, associated mass loss rates and timescales between outflow events, the electron densities within any shocked regions, and the magnetic field topologies.
Our integration times were chosen to maximize the chances of finding resolved structure around TWA 30A and B. Since TWA 30A is fairly bright (R = 12.9), it will saturate the UVIS detector fairly quickly, especially in the redder filters. Thus, we are taking a two–step approach to imaging the field. In each filter, three long and three short exposures will be obtained to fill a single orbit. The short exposures will not saturate, while the longer exposures will be more sensitive to faint structure. We will use fractional pixel dithers to improve PSF sampling, hot pixel and artifact rejection, and to fill any gaps between UVIS CCDs. The proposed exposure times, estimated with the online calculator are listed in Table 1. Including overheads, our proposal requires three orbits, one per filter. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false false false SUPPORTED STAR M V-IV T TAURI STAR This position was selected to place both targets near the center of the UVIS1 and UVIS2 chips. R = 12.9, B = 15.6, J = 9.64, K = 8.77 J2000 11 32 18.3173 -30 19 51.81 J2000 WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F625W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false /private/var/folders/XS/XShs8LlZGW8XvRPg1yAYOk+++TI/-Tmp-/OPVisit5663366640117034175.xml Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12208 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "09-Jul-2010 11:30:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12208 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12208 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2908 :al-overhead-at-end 116 :internal-dur-at-end 354 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0 /private/var/folders/XS/XShs8LlZGW8XvRPg1yAYOk+++TI/-Tmp-/OPVisit821541030080151098.xml Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12208 :visit-id "02" :proposal-version -1 :trans-version "20100505" :date "09-Jul-2010 11:30:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12208 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12208 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2911 :al-overhead-at-end 116 :internal-dur-at-end 354 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0 /private/var/folders/XS/XShs8LlZGW8XvRPg1yAYOk+++TI/-Tmp-/OPVisit8119466477717547137.xml Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12208 :visit-id "03" :proposal-version -1 :trans-version "20100505" :date "09-Jul-2010 11:30:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12208 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12208 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2917 :al-overhead-at-end 116 :internal-dur-at-end 354 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 1 0