0 Assigned ID: 1023 ----- Attempting Submission 1 (Fri Apr 07 22:44:48 GMT 2017) ----- Grouped visits 1 and 2 to execute within 0.5 days of each other, this to minumize the effect of stellar variability on measurements of the nebula color structure. -880132765 ----- Attempting Submission 1 (Thu Jul 20 05:23:21 GMT 2017) ----- ----- Attempting Submission 2 (Sun Sep 10 16:20:08 GMT 2017) ----- ----- Attempting Submission 3 (Sat Oct 21 18:15:49 GMT 2017) ----- Tracing Interactions of a Protoplanet with its Circumstellar Disk A candidate companion to a very young star has been discovered in HST snapshot optical images. The object is projected at the outer radius of an edge-on protoplanetary disk and is aligned with the disk plane. Keck LGS photometry results indicate the object has the same temperature as brown dwarf GQ Lupi b but with 10x less luminosity - consistent with a planetary mass companion. Because the edge-on disk suppresses the light of the central star, the companion is uniquely accessible to follow-up studies with minimal starlight residuals. We propose HST/WFC3 imaging and spectroscopy of the system to 1) fully define the morphology of the disk scattered light, particularly at the disk outer edge near the companion; 2) search for Halpha emission from the companion as evidence that it is actively accreting; and 3) complete spectral characterization of the companion using G141 spectroscopy. Confirmation of a substellar spectrum, accretion, and disk interaction action would establish this object as a leading example of an accreting protoplanet at 100 AU and offer support to models for planet formation by gravitational instability. We will use ACS WFC to make a full-orbit CR-SPLIT F814W image and WFC3 UVIS to make full-orbit CR-SPLIT images in F555W and F656N. The two broadband filter images are designed to detect the structure and extent of the scattered light along with the F606W image made in the Cycle 23 snapshot, will provide continuum level references needed to quantify the strength of the companion's Halpha emission line from the F656N image. The deep F656N image will also reveal any emission knots tracing an outflow from the primary star or the companion. We will use WFC3 IR to make a full-orbit F160W image of the system to trace the scattered light for comparison with the optical frames. Vertical and radial density gradients in the disk will be apparent from any changes in the distribution of scattered light with wavelength. In addition, a full-orbit G141 staring spectrum of the companion will achieve S/N of 60 in the 1.3 um water band according to the WFC3 IR spectroscopy exposure time calculator. The companion has an H magnitude of 16.6. To avoid saturation in F160W the WFC3/IR MULTIACCUM exposures need to be limited to 150 sec. Our science goal is a deep exposure on the reflected light nebulosity at H band, while also looking closely at the companion to resolve any extension. Thus we need to fill the full orbit with 150 sec exposures, each of which will be SPARS25 NSAMP=7. To fully sample the PSF in x and y, a box dither pattern is needed. To move the source completely off itself, we select box sides of 5 and 4 arcsec, multiplying the default IRditheboxmin paramerters by 9 and 11 in the two axes. A full frame readout of 16 short exposures would force buffer dumps that would result in a poor duty cycle. Since our target is <10" across we opt to take 512x512 subarray images; these prevent the buffer from filling and allow a high duty cycle. The 4 point dither pattern is repeated 4 times to fill the orbit dedicated to F160W imaging. For the G141 grism observations it is crucial that the spectrum of the central object and the companion do not overlap. The objects are separated by 0.9" along PA 157. The APT visualization tools were used to select an ORIENT range that should accomplish this goal, which also providing a guide star in one of the FGS pickles. Saturation of the grism spectrum is not an issue. Dithering of the grism observations is now implemented, using a line dither pattern that is intended to moving the source perperdicular to the disperson direction over four positions. The ACS and WFC3 UVIS orbits are not dithered in order to avoid blurring of the image that would result from aligning & resampling the two CR-SPLIT images. Local medians will instead be used to remove hot pixels. In phase I the F814W image was intended to also be taken with WFC3 UVIS. A comparison of the sensitivities of the two cameras showed that ACS would be almost a factor of two more sensitive at this wavelength, so we elect to move this exposure to ACS. Because half-orbit exposures would saturate the primary star at this wavelength, the F814W sequence starts with an unsaturated 120 second exposure, and then CR-SPLITS the remaining time in the orbit. Visit 1 is the single orbit of ACS, Visit 2 is 2 orbits of WFC3 UVIS, and Visit 3 is 2 orbits of WFC3 IR. Planets and Planet Formation 6 false false false false false false SUPPORTED STAR EXTRA-SOLAR PLANET PRE-MAIN SEQUENCE STAR PROTOPLANETARY DISK T TAURI STAR YSO This object was generated by the target selector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/IR Spectroscopic No No G141 WFC3/IR Imaging No No F160W POS-TARG DITHER 5.148 LINE 4.015 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false POS-TARG DITHER 6.084 LINE false false 4 90.48 LINE 2 false Timing link suitability includes constraints ([Group (01 02) Within 0.5 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15148 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "21-Oct-2017 11:02:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15148 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15148 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2820 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3217 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02) Within 0.5 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15148 :visit-id "02" :proposal-version -1 :trans-version "20170613" :date "10-Sep-2017 09:18:20.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15148 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15148 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2736 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3217 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15148 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2842 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3217 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15148 :visit-id "03" :proposal-version -1 :trans-version "20170613" :date "10-Sep-2017 09:18:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1974400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15148 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15148 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2675 :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 3217 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15148 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2893 :al-overhead-at-end 0 :internal-dur-at-end 633 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3217 :pcs-gap 0 ) false 2 0