0 Assigned ID: 1089 ----- Attempting Submission 1 (Tue Feb 26 16:28:28 GMT 2013) ----- HST Phase I Proposal 1089 (cycle21_fomalhaut.pdf.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 08:11:25 GMT 2013) ----- HST Phase I Proposal 1089 (cycle21_fomalhaut.pdf.apt) successfully submitted. This target is not used in this proposal. Based on our approved HOPR 80589, we have changed our final two orbits two STIS G750L. These two orbits are identical, but should be spread out in time as much as possible, in order to measure the changing dust attenuation over time on the background star. **PC Changes to guide star acq and link removal** -433368592 ----- Attempting Submission 1 (Thu Jun 27 13:52:16 GMT 2013) ----- ----- Attempting Submission 2 (Mon Nov 17 12:16:58 GMT 2014) ----- ----- Attempting Submission 3 (Wed Nov 19 09:17:43 GMT 2014) ----- ----- Attempting Submission 4 (Wed Apr 22 13:03:41 GMT 2015) ----- ----- Attempting Submission 5 (Wed Apr 22 16:27:31 GMT 2015) ----- One warning relates to orbit 1, which was already completed. The other warning is about target 3, which we would have observed with COS but since we are only using STIS, we will not use this target. It is the same source as our background star, but direct acquisition versus an offset from Fomalhaut. Transmission spectroscopy through the debris disk of Fomalhaut Fomalhaut, a young nearby A4V star, is surrounded by an inclined dust debris belt, directly imaged in optical scattered light with the HST. The proper motion and parallax of Fomalhaut will move this belt across an 18th magnitude background white dwarf star in the next decade. This presents a unique and fortuitous opportunity to probe the presence of gas and dust in the debris disk through spatially resolved transmission spectroscopy. We propose obtaining an HST/COS spectrum of the absorption during the diffuse (Cycle-21), thick (Cycle-23), and pristine (~2021) phase of occultation as the debris disk moves across the target background source. This is a rare opportunity to measure - for the first time - refractory elements and dust properties in a known planet-forming system, providing a valuable constraint on current planet formation theories. This experiment will act as a pathfinder for this type of science for future observations with JWST and future ELTs. We will use STIS and COS in Cycle-21. We will obtain a quick (1000 s) spectrum with the STIS G140M to ensure the scattered light does not violate the bright object limit of COS. In the same orbit, we will switch to STIS G750L for the remaining time (~26 minutes). Once our target is confirmed to not violate the COS bright object limit, we will use three orbits with the COS grating G130M 1222 A to observe the 18th magnitude background source. ISM AND CIRCUMSTELLAR MATTER 12 Regular false true false false false SUPPORTED STAR WDO OFFSET J2000 STAR A0-A3 V-IV J2000 STAR WDO This is the same source as Fixed Target 1. This target will be used for Orbits 3-4 with COS with direct acquisition as there is no mode of COS that can safely offset from Fomalhaut. The RA and DEC of this background source will be revised after visit 1. DIRECT J2000 J2000 STAR WDO OFFSET J2000 STIS/FUV-MAMA Spectroscopic No No G140M 1272 STIS/CCD Spectroscopic No No G750L 7751 COS/FUV Spectroscopic No No G130M 1222 STIS/FUV-MAMA Spectroscopic No No G140M 1272 STIS/CCD Spectroscopic No No G750L 7751 COS/FUV Spectroscopic No No G130M 1222 The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. First we will acquire Fomalhaut and then offset to the 18th magnitude faint target. 1413669626000 70.5792856981592 (Tic-Visit :proposal-id 13434 :visit-id "01" :proposal-version -1 :trans-version "20150128" :date "22-Apr-2015 14:47:24.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 179424 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13434 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13434 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2919 :al-overhead-at-end 0 :internal-dur-at-end 558 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 1 1 Acquire Fomalhaut Spectrum to ensure this target does not violate the COS bright object limits. Spectrum to compare with previous STIS observations and obtain an extinction curve. The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. 1 orbit with STIS G430L. 1418533236000 76.0 (Tic-Visit :proposal-id 13434 :visit-id "03" :proposal-version -1 :trans-version "20150128" :date "22-Apr-2015 14:48:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 92432 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13434 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13434 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2907 :al-overhead-at-end 119 :internal-dur-at-end 400 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 1 0 Acquire Fomalhaut. Timing link suitability includes constraints ([05 After 04 by 100.0 to 365.0 days]) The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. /private/var/folders/h2/_3b1kkv56nn2rfp1zrxtm0sc0006z1/T/OPVisit1675905384097113384.xml This orbit will be with G750L STIS to measure dust attenuation on a background star from the Fomalhaut debris disk. First we acquire Fomalhaut and then offset to the faint background star. (Tic-Visit :proposal-id 13434 :visit-id "04" :proposal-version -1 :trans-version "20150128" :date "22-Apr-2015 12:25:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 166048 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13434 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13434 :visit-id "04" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2902 :al-overhead-at-end 119 :internal-dur-at-end 599 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 1 0 Acquire Fomalhaut Comparison with orbit 1 and archival data (ID:8788) will allow us to measure dust attenuation from the Fomalhaut disk on a background star. Timing link suitability includes constraints ([05 After 04 by 100.0 to 365.0 days]) The scheduling data was generated by CASM 23.0. CASM was run in Phase II mode. /private/var/folders/h2/_3b1kkv56nn2rfp1zrxtm0sc0006z1/T/OPVisit7268580582052272473.xml This orbit will be with G750L STIS to measure dust attenuation on a background star from the Fomalhaut debris disk. First we acquire Fomalhaut and then offset to the faint background star. Please execute this orbit as far as possible after "Orbit 3: STIS G750L (04)". This allows us to compare the dust attenuation on the background star in different parts of the Fomalhaut debris disk. (Tic-Visit :proposal-id 13434 :visit-id "05" :proposal-version -1 :trans-version "20150128" :date "22-Apr-2015 12:25:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 166048 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13434 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13434 :visit-id "05" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2902 :al-overhead-at-end 119 :internal-dur-at-end 599 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 1 0 Acquire Fomalhaut Comparison with orbit 1 and archival data (ID:8788) will allow us to measure dust attenuation from the Fomalhaut disk on a background star.