Cannot find file /user/dctaylor/proposals2/1211-Kelly.pdf 0 Assigned ID: 1211 ----- Attempting Submission 1 (Tue Jun 14 20:00:09 GMT 2016) ----- In this resubmission, I have replaced F336W with F606W for Visits 01 and 05, and changed the preferred orient of 102.1 for Visits 03 -- 05. 2061450977 ----- Attempting Submission 1 (Mon Jun 20 19:55:19 GMT 2016) ----- ----- Attempting Submission 2 (Tue Jun 21 15:02:50 GMT 2016) ----- Caustic Crossing of a Strongly Lensed Massive Star During a WFC3-IR visit to the MACS J1149 galaxy-cluster field in late April, we discovered a new transient approximately 5 arcseconds from the reappearance of SN Refsdal. The new object lies at the intersection of a star-forming arm of the host-galaxy of SN Refsdal at redshift z=1.49 and the critical curve of the galaxy cluster (<0.1 arcsec). Applying orbits from the RefsdalRedux program, we now have a light curve spanning several months which shows a sustained rise followed by multiple abrupt (< 2 days) changes in flux of ~1 magnitude. To determine the nature of the lensed source, we acquired optical imaging with the FrontierSN program and the rest-frame UV-through-optical spectral energy distribution is consistent with that of a B supergiant star with a pronounced Balmer break at redshift z=1.49. We have concluded that the object is likely the first example of a star observed crossing a cluster caustic and is probably magnified by a factor of hundreds of thousands to more than a million. We propose observations which will explain the origin of the strong fluctuations in the transient's light curve, and constrain the composition of dark matter as well as the population of stars and planets in the intracluster medium. To construct the light curve and improve constraints on the spectral energy distribution of the likely caustic-crossing event in the MACS1149 galaxy-cluster field, the program will acquire WFC3 imaging in five separate single-orbit visits beginning the week of July 11th through July 23rd 2016. Three of the visits will have an even split between WFC3-IR F125W and WFC3-IR F160W integrations to provide a match with observations from the RefsdalRedux program (PID: 14199), while the remaining two will be evenly split between WFC3-IR F125W and WFC3-UVIS F606W. The WFC3-IR F125W and WFC3-UVIS F606W observations will span the clear Balmer break and confirm early observations indicating that the SED does not show substantial change, as expected for gravitational lensing. Intergalactic Medium and Cosmology Stellar Populations 0 SUPPORTED EXT-STAR B6-B9.5 III-I J2000 J2000 Transient source is changing in brightness rapidly. Current J Band magnitude ~ 26 AB. WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/UVIS Imaging No No F606W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/UVIS Imaging No No F606W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F110W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/kd/9gz8jnx08xn00w0059bjywj00000gp/T/OPVisit2388791420354510202.xml 3 short WFC3-IR F125W and 3 short WFC3-UVIS F606W exposures of the caustic-crossing event in MACS1149. preferred orient = 107 or 109 (Tic-Visit :proposal-id 14528 :visit-id "01" :proposal-version -1 :trans-version "20160322" :date "21-Jun-2016 08:02:36.0" :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 1353696 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14528 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14528 :visit-id "01" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2735 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/kd/9gz8jnx08xn00w0059bjywj00000gp/T/OPVisit3764293823809516694.xml 3 short WFC3-IR F125W and 3 short WFC3-IR F160W exposures of the caustic-crossing event in MACS1149. preferred orient = 107 or 109 (Tic-Visit :proposal-id 14528 :visit-id "02" :proposal-version -1 :trans-version "20160322" :date "21-Jun-2016 08:02:37.0" :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 14528 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14528 :visit-id "02" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2735 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/kd/9gz8jnx08xn00w0059bjywj00000gp/T/OPVisit6008401932534910492.xml 3 short WFC3-IR F125W and 3 short WFC3-IR F160W exposures of the caustic-crossing event in MACS1149. preferred orient = 102.1 (Tic-Visit :proposal-id 14528 :visit-id "03" :proposal-version -1 :trans-version "20160322" :date "21-Jun-2016 08:02:37.0" :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 14528 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14528 :visit-id "03" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2735 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/kd/9gz8jnx08xn00w0059bjywj00000gp/T/OPVisit2525058657337622743.xml 3 short WFC3-IR F125W and 3 short WFC3-IR F160W exposures of the caustic-crossing event in MACS1149. preferred orient = 102.1 (Tic-Visit :proposal-id 14528 :visit-id "04" :proposal-version -1 :trans-version "20160322" :date "21-Jun-2016 08:02:38.0" :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 14528 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14528 :visit-id "04" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2735 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /Users/patkelly/Desktop/OP-cache/phaseii-v05.xml 3 short WFC3-IR F125W and 3 short WFC3-UVIS F606W exposures of the caustic-crossing event in MACS1149. preferred orient = 102.1 (Tic-Visit :proposal-id 14528 :visit-id "05" :proposal-version -1 :trans-version "20160322" :date "21-Jun-2016 07:59:44.0" :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 1353696 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14528 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14528 :visit-id "05" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2735 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0