0 Assigned ID: 435 ----- Attempting Submission 1 (Fri Apr 10 11:55:15 GMT 2015) ----- HST Phase I Proposal 435 (acswtts.apt) successfully submitted. Receipt: # 435-1 ----- Attempting Submission 2 (Fri Apr 10 16:00:05 GMT 2015) ----- HST Phase I Proposal 435 (acswtts.apt) successfully submitted. Receipt: # 435-2 ----- Attempting Submission 3 (Fri Apr 10 17:26:02 GMT 2015) ----- HST Phase I Proposal 435 (acswtts.apt) successfully submitted. Receipt: # 435-3 ----- Attempting Submission 4 (Fri Apr 10 18:16:05 GMT 2015) ----- HST Phase I Proposal 435 (acswtts.apt) successfully submitted. Receipt: # 435-4 ----- Attempting Submission 5 (Fri Apr 10 18:37:53 GMT 2015) ----- HST Phase I Proposal 435 (acswtts.apt) successfully submitted. Receipt: # 435-5 ----- Attempting Submission 6 (Fri Apr 10 18:44:20 GMT 2015) ----- This target is not used in this proposal. This target is not used in this proposal. 0 ----- Attempting Submission 1 (Tue Jul 21 20:55:24 GMT 2015) ----- ----- Attempting Submission 2 (Wed Aug 17 10:04:13 GMT 2016) ----- The targets have been replaced by new ones to avoid brightness problems The final stages of accretion are complicated to study because very small accretion rates cannot be detected against bright chromospheric emission. Currently, it is not clear what causes accretion to turn off. While the gas has been difficult to observe in the past, new observations of H2 in far-ultraviolet spectra have proved to be sensitive probes of hot accreting disk gas. We propose to look for gas in a sample of sources which have evidence for remaining dust in the disk, yet lack evidence for accretion in the convential tracers (e.g. Halpha and UV excess). We will observe this sample using the Advanced Camera for Surveys/Solar Blind Channel (ACS/SBC) PR130L FUV prism. Similar observations have shown that, while low resolution, the ACS/SBC prism is extremely sensitive to small quantities of gas in circumstellar disks, more sensitive than common accretion diagnostics. We will determine whether or not these sources have any gas remaining in the disk, providing key constraints for disk dissipation theories. We follow an observing strategy which was successful in previous ACS/SBC observations of T Tauri stars. For each object, we will obtain an FUV spectrum and a brief FUV image for wavelength calibration. Each target will require one orbit of observations in which we will spend 100 - 200s (exposure times vary between sources and are slightly longer for dimmer or more extincted sources) using the F165LP filter and the remaining time, around 2,400 to 2,600 seconds, with the PR130L prism. Additional Comments: Visit 2: Health/Safety source is the target CVSO 1335, is mis-identified as an O5, and is actually a M1 as determined from existing spectra. Visit 7: Health/Safety source is the target SO 247, is mis-identified as an O5, and is actually a M5 as determined from existing spectra. Visit 8 Health/Safety source is the target CVSO 95, is mis-identified as an O5, and is actually a M5 as determined from existing spectra. Visit 9: Health/Safety source is the target CVSO 114, is mis-identified as an O5, and is actually a K7 as determined from existing spectra. RESOLVED STAR FORMATION 12 false true false false false false SUPPORTED STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR T TAURI STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR T TAURI STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR T TAURI STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR T TAURI STAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR J2000 J2000 STAR T TAURI STAR J2000 STAR T TAURI STAR J2000 ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L ACS/SBC Imaging No No F165LP ACS/SBC Spectroscopic No No PR130L 1471428174047 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit1074137218283573507.xml 1455392228000 75.89313129134919 (Tic-Visit :proposal-id 14190 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428175075 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit3380984342648527637.xml 1458629348000 90.85061882804388 (Tic-Visit :proposal-id 14190 :visit-id "02" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428175884 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit4701212806232613291.xml 1455398010000 73.48538609655671 (Tic-Visit :proposal-id 14190 :visit-id "04" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428176601 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit3396086502757482007.xml 1458695246000 91.44853790645811 (Tic-Visit :proposal-id 14190 :visit-id "05" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428177333 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit2405907089097370194.xml 1458700971000 91.45362893548571 (Tic-Visit :proposal-id 14190 :visit-id "06" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428178072 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit1303056159698668691.xml 1455655615000 76.0 (Tic-Visit :proposal-id 14190 :visit-id "08" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428178770 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit1273225104184032900.xml 1458706691000 91.1727357764222 (Tic-Visit :proposal-id 14190 :visit-id "09" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:58.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428179483 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit8057664072179914356.xml 1455403700000 74.6100138576098 (Tic-Visit :proposal-id 14190 :visit-id "10" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 1471428180198 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. /private/var/folders/br/j13m530d7hn_t1dkgz6wxx04006sq5/T/OPVisit5616810483082583776.xml 1455644190000 75.804381243379 (Tic-Visit :proposal-id 14190 :visit-id "11" :proposal-version -1 :trans-version "20160601" :date "17-Aug-2016 06:02:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 /Users/ncalvet/newtextos/proposals/hst/cycle22/wtts/OP-cache/14190-v12.xml 1470752352418 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14190 :visit-id "12" :proposal-version -1 :trans-version "20160601" :date "09-Aug-2016 10:19:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 The BOT includes an "unknown" object in the field: Unknown, SBC, S1LR025944, 05 30 2.3108, -01 55 30.94, GSC2, We have checked in our CVSO photometric survey, as wel as in DSS and 2MASS images. There is no source at that position. The BOT includes an "unknown" object in the field: Unknown, SBC, S1LR025944, 05 30 2.3108, -01 55 30.94, GSC2, We have checked in our CVSO photometric survey, as wel as in DSS and 2MASS images. There is no source at that position. /Users/ncalvet/newtextos/proposals/hst/cycle22/wtts/OP-cache/14190-v13.xml 1470752314194 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14190 :visit-id "13" :proposal-version -1 :trans-version "20160601" :date "09-Aug-2016 10:18:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 74064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14190 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14190 :visit-id "13" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 117 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 The BOT indicates that two objects exceed the Local Health and Safety, assuming that they are unreddeneded O5 stars. These stars are RA DEC V B-V S1LN000172, 05 33 4.3140, -00 42 18.71, GSC2, 14.18, 15.40, 14.74, 0.65 S1LN012378, 05 33 6.2421, -00 42 19.96, GSC2, 13.57, 15.85, 14.71, 1.35 The first star of this list has a B-V color of 0.65. The 3D maps of the dust distribution combining Pan-STARRS 1 and 2MASS photometry (Green et al 2015, ApJ 810, 25) indicate a color excess E(B-V) ~ 0.15 in the direction of this star. Using the observed B-V color and standard star photometry (Kenyon & Hartmann 1995, ApJS 101, 117) yields a spectral type of F7 for this star, with V limiting magnitudes 6.7 (F165LP, Table 7.4 of ACS Handbook) and 5 (PR130L), way above the observed V magnitude. The second star in the BOT list is the target. It has a spectral type of M0 (Briceno et al 2005, AJ, 129, 907) so its V magnitude (14.7) is way below the bright limit (3 -4). The BOT found all sources in the field safe.