0 Assigned ID: 5966 ----- Attempting Submission 1 (Wed Nov 06 16:23:59 GMT 2024) ----- HST Phase I Proposal 5966 successfully submitted. Receipt: # 5966-1 ----- Attempting Submission 2 (Wed Nov 06 16:28:40 GMT 2024) ----- HST Phase I Proposal 5966 successfully submitted. Receipt: # 5966-2 ----- Attempting Submission 3 (Thu Nov 07 15:46:14 GMT 2024) ----- 0 ----- Attempting Submission 1 (Thu Jan 16 12:00:31 GMT 2025) ----- Return to Eden: Massive Star Formation in the Time Domain Massive stars announce their birth with accretion powered fireworks, piercing powerful jets through their natal clouds. Lower-mass sibling stars dance around the cradle, swirling and sparkling in its deep gravitational well. Here we propose to survey this activity with a return to four massive protostellar systems, first observed by HST WFC3/IR in 2016. Combined with existing archival data, this will then yield a total sample of seven sources with such two-epoch observations. Protostellar jets are expected to have terminal velocities similar to the escape speed of their launching region from the inner disk near the protostellar surface, which can be greater than 1000 km/s. We will accurately measure the plane of sky speeds and directions of jet knots, especially as traced by [FeII]. These measurements will be combined with ancillary NIR spectroscopic data to yield the most complete kinematic characterization of these massive protostellar outflows, providing powerful diagnostics of the massive star formation process. The flux variability of the jet knots, scattered light from the massive protostar, and from low-mass YSOs will also be studied, delivering crucial measures of outflow and accretion variability. To achieve these science goals requires precise photometric measurements with HST-WFC3/IR for direct comparison with the earlier epoch images. This program will observe four high-mass young stellar objects driving powerful jets. These observations will be a second epoch where the first epoch observations were taken back in 2016 with exact same instruments and filters. We aim at measuring proper motions from the jet knots driven by the massive protostars as well as to study variability in the field. Each orbit will observe one region with the four filters, namely F110W and F160W for broad-band filters and F128N and F164N for narrow-band filters. Dr. Ruben Fedriani is an expert in NIR observational studies, in particular in the study of high-mass star formation. He has led previous publications using HST data. Dr. Morten Andersen is an expert on infrared imaging from the ground and space and has led studies of massive star forming regions both from the ground and with the HST. Dr. Yichen Zhang has expertise in radiative transfer modelling and millimetre observations, and has worked on the complementary data of the SOMA targets. Dr. Yu Cheng is an expert on radio observations of massive star formation. Prof. Jonathan Tan is PI of the SOMA Survey and has expertise in star formation studies. Prof. Zhi-Yun Li is an expert on star formation, including outflows and disks. Stellar Populations and the Interstellar Medium 6 false false false false false false SUPPORTED STAR YSO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 J=13.45;H=10.76 STAR YSO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 J=13.9;H=13.3 STAR YSO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 J=14.7;H=12.9 STAR YSO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 J=22.27;H=18.04 WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F164N /private/var/folders/lm/ldhlhzn93g7_4htw3wn6qr880000gn/T/OPVisit17990836049111246344.xml The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. 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