0 Assigned ID: 1176 ----- Attempting Submission 1 (Tue Sep 29 15:51:14 GMT 2015) ----- 0 ----- Attempting Submission 1 (Sat Dec 12 17:16:11 GMT 2015) ----- Peering to the Heart of Massive Star Birth We propose a small survey of massive/intermediate-mass protostars with WFC3/IR to probe J and H band continuum emission, the Pa-beta and the [FeII] emission. The protostar sample is already the subject of approved SOFIA-FORCAST observations from 10-40 microns. Combined with sophisticated radiative transfer models, these observations are providing the most detailed constraints on the nature of massive protostars, their luminosities, outflow cavity structures and orientations, and distribution of surrounding dense core gas and dust. Recently, we were also awarded ALMA Cycle 3 time to study these sources at up to 0.14" resolution. The proposed HST observations, with very similar resolution, have three main goals: 1) Detect and characterize J and H band continuum emission from the massive/intermediate-mass protostars, which is expected to arise from jet and outflow knot features and from scattered light emerging from the outflow cavities; 2) Detect and characterize Pa-beta and [FeII] line emission tracing ionized and FUV-illuminated regions around the massive protostars, important diagnostics of the protostellar source and its outflow structure; 3) Search for lower-mass protostars that may be clustered around the forming massive protostar. All of these objectives will help test massive star formation theories. The high sensitivity and angular resolution of WFC3/IR enables these observations to be carried out efficiently in a timely fashion. Mid-Cycle observations are critical for near contemporaneous observation with ALMA, since jet/outflow knots may have large proper motions, and to maximize the potential time baseline for a future HST study of jet/outflow proper motions. This is very straight forward program. 5 visits, each of them of one orbit, each of them on one of 5 independent targets. For each orbit, the target is observed with WFC3/IR imaging in 4 filters. RESOLVED STAR FORMATION 12 false false false false SUPPORTED STAR YSO J2000 J2000 STAR YSO J2000 J2000 STAR YSO J2000 J2000 STAR YSO J2000 J2000 STAR YSO J2000 J2000 WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F164N C:\SCIENCE\HST proposals 2015\protostars_midcycle\phaseII\OP-cache\phaseII-v01.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. 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