Coronagraphic imaging of the submillimeter debris disk of a 200Myr old M-dwarf

Coronagraphic imaging of the submillimeter debris disk of a 200Myr old M-dwarf A recent sub-millimeter survey has unambiguously discovered a new debris disk around the M0.5 dwarf GJ842.2 which is 200 Myr old. Reanalysis of the IRAS data has shown that there is also a 25 micron excess toward this star indicating warm dust close to the star. It is also only the second debris disk found among M-dwarfs that constitute 70 % of the stars in the Galaxy. Collisional and Poynting-Roberston timescale arguments indicate that the cold grains detected in the sub-mm are ``primordial'', i.e. original grains from the protoplanetary phase. The disk around GJ842.2 is thus unique in terms of the presence of dust at such a late stage of evolution and presents two conundrums: why did it retain so much primordial dust at large distances, and why does it continue to produce dust close to the star? We propose to conduct high contrast NICMOS coronagraphic imaging of GJ842.2 to determine the spatial distribution of the small reflecting grains and test the various scenarios which might explain the IRAS and sub-mm data e.g.resonant trapping of dust by planets or ``sandblasting'' by interstellar medium grains working more aggressively on a low-luminosity star than on an A-type star like Beta Pic. Also, we would search for an evolutionary sequence between GJ842.2 and the only other M-dwarf with a disk resolved by HST, the 10 Myr old AU Mic system.

The NICMOS coronagraph will be used to image GJ 842.2 at F110W, F165M to resolve its faint debris disk. Two visits (3 orbits and 4 orbits each, respectively) will be used to image our science target. The second visit has the constraint that the observations have a roll angle difference of 30 degrees from the first visit; this roll angle constraint will enable us to better differentiate real disk structure from PSF subtraction artifacts. A third visit (2 orbits) will be used to observe our PSF calibrator, GJ 809. All 3 visits are constrained to occur in adjacent orbits to prevent motion of the coronagraphic mechanism and reduce time-dependent "breathing" of the telescope focus. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false false false SUPPORTED STAR CIRCUMSTELLAR MATTER DISK M V-IV Coordinates (ICRS J2000; epoch 1989.03 from GSC 2.2 catalog). PM [((0.23183 as/yr) / (15cos 75.58900273 deg)); 22.60 mas/yr) taken from Hipparcos Main Catalog. HIP108467 J2000 21 58 24.5170 +75 35 20.61 J2000 STAR CIRCUMSTELLAR MATTER DISK M V-IV Coordinates (ICRS J2000; epoch 1991.25 from Hipparcos catalog). PM [RA = RA_PM/15cos Dec = ((0.23183 as/yr) / (15cos 75.58900273 deg)) = 0.0621; Dec = 22.60 mas/yr) taken from Hipparcos Main Catalog. HIP108467 J2000 21 58 24.5170 +75 35 20.61 J2000 STAR M V-IV Coordinates (ICRS J2000; epoch1991.120) from GSC 2.2 catalog. PM (1.08 mas/yr, -774.24 mas/yr) from Hipparcos catalog. HD199305 J2000 20 53 19.7900 +62 09 15.81 J2000 STAR M V-IV Coordinates (ICRS J2000; epoch1991.25) from Hipparcos catalog. PM (RA = RA_PM/15cosDec = 1.08 mas/yr / 15cos(62.15627228) = 1.5E-4; Dec = -774.24 mas/yr) from Hipparcos catalog. HD199305 J2000 20 53 19.7900 +62 09 15.81 J2000 STAR M V-IV Coordinates at epoch 1995.584 from the Guide Star Catalog version 2.3. Proper motion values from Lepine et al 2005, AJ, 129, 1483. RA proper motion determined by 0.214 "/yr / 15 cos (dec) = 0.214 / 15 cos (69.168664) = 0.04012 GJ4170 J2000 00 00 0.0000 +00 00 0.00 J2000 ACS/HRC Imaging Yes No F502N ACS/HRC Imaging Yes No F435W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F814W ACS/HRC Imaging Yes No F435W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F814W Timing link suitability includes constraints ([02 After 01 by 0.1 to 1.0 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. We have no orient or timing requirements for this visit. It is imperative that the visit be executed without interruption. This program was previously an ACS coronagraphy program scheduled for execution from Aug 30-Sept 1 2007. The redesign of the program for usage of the NICMOS coronagraph per the present phase-2 file does not adversely affect this previous plan window. 1188556687000 156.0 (Tic-Visit :proposal-id 10897 :visit-id "01" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:43:58.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 461552 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2865 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "01" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2834 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "01" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2747 :al-overhead-at-end 0 :internal-dur-at-end 125 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) true 3 0 Timing link suitability includes constraints ([02 After 01 by 0.1 to 1.0 days] [03 After 02 by 0.1 to 1.0 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. We have no orient constraints for Visit #02. It is imperative that visit #02 is executed following visit #01 as per the specified timing requirement, to minimize the severity of PSF subtraction residuals caused by the "breathing" of the telescope focus. 1188568770000 153.14176285004498 (Tic-Visit :proposal-id 10897 :visit-id "02" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 319120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2668 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "02" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2658 :al-overhead-at-end 0 :internal-dur-at-end 105 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) true 2 0 Timing link suitability includes constraints ([03 After 02 by 0.1 to 1.0 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. Visit #03 must be oriented 28-32 degrees from the orient used in visit #01, to enable us to differentiate PSF subtraction residuals from bonafide disk structure. Visit #03 must be executed as per the specified timing requirement, to minimize PSF subtraction residuals caused by the "breathing" of the telescope focus. 1188579646000 184.0 (Tic-Visit :proposal-id 10897 :visit-id "03" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 532224 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "03" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2865 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "03" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2779 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "03" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2931 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10897 :visit-id "03" :orbit-number 4 :pcs-time 355 :si-vis-utilization 2930 :al-overhead-at-end 0 :internal-dur-at-end 105 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) true 4 0 Timing link suitability includes constraints ([12 After 11 by at most 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258357983000 96.0 (Tic-Visit :proposal-id 10897 :visit-id "11" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:10.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "11" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 309 for 0.01sec integration (assumes M0V, renormalized to V=10.56) --> this is below saturation (achieved w/ an integration of 0.43 seconds). Note that we're using the F28x50LP long-pass filter. Timing link suitability includes constraints ([12 After 11 by at most 0.1 days] [13 After 12 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258363808000 73.85633279172839 (Tic-Visit :proposal-id 10897 :visit-id "12" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:11.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "12" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2884 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 281 for 4.0 sec integration (assumes M0V, renormalized to V=8.55) --> this is below saturation (achieved w/ an integration of 20.78 seconds). Note that the F25ND3 neutral density filter is used for GJ809. Timing link suitability includes constraints ([13 After 12 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258369483000 75.1352676873801 (Tic-Visit :proposal-id 10897 :visit-id "13" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:59.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "13" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3281 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 270.75 for 0.2 sec integration (assumes M0V, renormalized to V=11.62) --> this is below saturation (achieved w/ an integration of 1.13 seconds). Note that we're using the F28x50LP long-pass filter. Timing link suitability includes constraints ([22 After 21 by at most 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1255134553000 121.0 (Tic-Visit :proposal-id 10897 :visit-id "21" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:14.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "21" :obset-id "21" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "21" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 309 for 0.01sec integration (assumes M0V, renormalized to V=10.56) --> this is below saturation (achieved w/ an integration of 0.43 seconds). Note that we're using the F28x50LP long-pass filter. Timing link suitability includes constraints ([22 After 21 by at most 0.1 days] [23 After 22 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1255139909000 112.15114631927622 (Tic-Visit :proposal-id 10897 :visit-id "22" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:15.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "22" :obset-id "22" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "22" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2884 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 281 for 4.0 sec integration (assumes M0V, renormalized to V=8.55) --> this is below saturation (achieved w/ an integration of 20.78 seconds). Note that the F25ND3 neutral density filter is used for GJ809. Timing link suitability includes constraints ([23 After 22 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1255145879000 113.75044855902581 (Tic-Visit :proposal-id 10897 :visit-id "23" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:45:34.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "23" :obset-id "23" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "23" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3281 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 270.75 for 0.2 sec integration (assumes M0V, renormalized to V=11.62) --> this is below saturation (achieved w/ an integration of 1.13 seconds). Note that we're using the F28x50LP long-pass filter. Timing link suitability includes constraints ([32 After 31 by at most 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258909662000 71.0 (Tic-Visit :proposal-id 10897 :visit-id "31" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:18.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "31" :obset-id "31" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "31" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 309 for 0.01sec integration (assumes M0V, renormalized to V=10.56) --> this is below saturation (achieved w/ an integration of 0.43 seconds). Note that we're using the F28x50LP long-pass filter. Timing link suitability includes constraints ([32 After 31 by at most 0.1 days] [33 After 32 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258915684000 67.4794181396006 (Tic-Visit :proposal-id 10897 :visit-id "32" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:19.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "32" :obset-id "32" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "32" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2884 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 281 for 4.0 sec integration (assumes M0V, renormalized to V=8.55) --> this is below saturation (achieved w/ an integration of 20.78 seconds). Note that the F25ND3 neutral density filter is used for GJ809. Timing link suitability includes constraints ([33 After 32 by 0.0 to 0.1 days]) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1258921975000 68.54254163015591 (Tic-Visit :proposal-id 10897 :visit-id "33" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:45:36.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "33" :obset-id "33" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "33" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3281 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 270.75 for 0.2 sec integration (assumes M0V, renormalized to V=11.62) --> this is below saturation (achieved w/ an integration of 1.13 seconds). Note that we're using the F28x50LP long-pass filter. (Tic-Visit :proposal-id 10897 :visit-id "11" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:10.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "11" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 309 for 0.01sec integration (assumes M0V, renormalized to V=10.56) --> this is below saturation (achieved w/ an integration of 0.43 seconds). Note that we're using the F28x50LP long-pass filter. (Tic-Visit :proposal-id 10897 :visit-id "12" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:11.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "12" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2884 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3243 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 281 for 4.0 sec integration (assumes M0V, renormalized to V=8.55) --> this is below saturation (achieved w/ an integration of 20.78 seconds). Note that the F25ND3 neutral density filter is used for GJ809. (Tic-Visit :proposal-id 10897 :visit-id "13" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:59.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "13" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3281 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 270.75 for 0.2 sec integration (assumes M0V, renormalized to V=11.62) --> this is below saturation (achieved w/ an integration of 1.13 seconds). Note that we're using the F28x50LP long-pass filter. (Tic-Visit :proposal-id 10897 :visit-id "21" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:44:14.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "21" :obset-id "21" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "21" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3355 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 309 for 0.01sec integration (assumes M0V, renormalized to V=10.56) --> this is below saturation (achieved w/ an integration of 0.43 seconds). Note that we're using the F28x50LP long-pass filter. (Tic-Visit :proposal-id 10897 :visit-id "23" :proposal-version -1 :trans-version "20090130" :date "27-Jul-2009 11:45:34.0" :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 110832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10897 :visit-id "23" :obset-id "23" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10897 :visit-id "23" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 421 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3281 :pcs-gap 0 ) false 1 0 HST STIS Acq ETC gives SNR of 270.75 for 0.2 sec integration (assumes M0V, renormalized to V=11.62) --> this is below saturation (achieved w/ an integration of 1.13 seconds). Note that we're using the F28x50LP long-pass filter.