Blowin' in the Wind - Proper Motion Kinematics of Massive Protostellar Outflows

0 Assigned ID: 3427 ----- Attempting Submission 1 (Fri Mar 25 19:06:55 GMT 2022) ----- Resubmission for proper motion program adding a dither strategy checked with the CS and orient angles to be as close as possible to epoch 1 observations 1489813252 ----- Attempting Submission 1 (Fri Jul 01 11:44:09 GMT 2022) ----- HST Phase II Proposal 17086 successfully submitted. Receipt: # 17086-1 ----- Attempting Submission 2 (Mon Sep 12 21:28:58 GMT 2022) ----- Blowin' in the Wind - Proper Motion Kinematics of Massive Protostellar Outflows The answer to the question of how massive stars form may be blowing in the winds that they launch during their main accretion phase. Such winds 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. Here we propose to re-observe three massive protostars that were imaged by HST WFC3/IR in 2016 to measure the expected proper motion of outflow knots, especially as traced by [FeII]. The measurements of the proper motions of these outflow features will be combined with ancillary NIR spectroscopic data to yield the most complete kinematic characterization of the fastest components of massive protostellar outflows. Such data will provide unique and powerful constraints on massive star formation models. This project will also enable proper motion studies of the YSO populations around the massive protostars, i.e., to measure the motion of the protocluster population compared to background field stars and to search for runaway stars. The flux variability of the jet knots, scattered light from the massive protostar, and from low-mass YSOs will also be studied, delivering additional important diagnostics of the outflow and accretion processes. This program will observe three 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. 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. Jon Ramsey is an expert on the numerical modelling of protostellar outflows, including MHD, chemistry, and radiative transfer. He is also experienced at interpreting ALMA observations of outflows. Dr. Jan Staff is an expert on running MHD simulations of outflows from protostars. 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. Dr. Hosek is an expert in HST observations and proper motions studies. Stellar Populations and the Interstellar Medium 6 false false false false false false false SUPPORTED STAR EJECTA JET KNOT PRE-MAIN SEQUENCE STAR YSO YES This object was generated by the targetselector and retrieved from the SIMBAD database. 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