0 Assigned ID: 2219 ----- Attempting Submission 1 (Fri Apr 09 20:38:41 GMT 2021) ----- HST Phase I Proposal 2219 successfully submitted. Receipt: # 2219-1 ----- Attempting Submission 2 (Fri Apr 09 23:55:14 GMT 2021) ----- HST Phase I Proposal 2219 successfully submitted. Receipt: # 2219-2 ----- Attempting Submission 3 (Fri Apr 09 23:57:06 GMT 2021) ----- PI requests feedback on implementation of the dithering strategy. Check also requested on NSAMP settings. Prior comments still apply (7/29/2021, 1am EDT) 115117434 ----- Attempting Submission 1 (Thu Jul 29 04:52:02 GMT 2021) ----- The Hosts of Quasars with Newborn Jets Discovered in the Very Large Array Sky Survey We propose a WFC3/IR imaging study of the hosts of 4 quasars that were recently caught launching newborn jets by the Very Large Array Sky Survey (VLASS). The targets are broad-line (type 1) SDSS quasars at 0.2<z<1.0 that have transitioned from radio-quiet to radio-loud in the past 10-20 years. Extensive multi-wavelength follow-up observations in the radio and X-ray probing the jets and accretion states are underway, but the properties of the host galaxies remain unknown. The unmatched combination of angular resolution and PSF stability of HST is needed to enable accurate quasar/host galaxy decomposition and gain insights into the conditions under which quasar jets are born. Our proposed observations will measure the morphologies, sizes, and luminosities of the hosts of newborn quasar jets for the first time. A total of 4 orbits are required. Our sample size and observing request are modest, but will pave the way for larger studies in the next few years as new VLASS epochs continue to identify new candidates. We will compare the host properties of our sample with those of previous studies of quasar hosts. Our proposed study will help guide future campaigns with HST and JWST to determine the host galaxy properties and conditions under which jets are triggered. We will obtain new WFC3/IR images of the hosts of a quasars that were recently discovered to harbor newborn radio jets. The main goal is to search for signs of galaxy evolution drivers, such as major/minor mergers or tidal interactions, that may be associated with the triggering of the young jets. Our WFC3/IR imaging strategy employs the use of a single broadband filter suitable for detecting the rest-frame optical emission from the main stellar population. We have carefully chosen the most appropriate WFC3/IR filter for each target to avoid strong lines with the potential for contamination by extended emission line regions. We expect the stellar light of the host galaxy to be bright relative to the (dominant) quasar in the filters we have selected. We will observe in MULTIACCUM mode using STEP spacing (STEP50) with a minimum of 11 samples (NSAMP >= 11). We require a total of 4 orbits (one orbit per target) including all standard WFC3/IR overheads for guide star acquisition, dithering, and readouts. This will leave a total of ~2200 seconds per orbit for observing each target. We expect the underlying host galaxy brightness of each target in the selected WFC3/IR filter to be 21-22 (AB). Angular extents of the hosts are expected to be compact (0.2-2 arcseconds). Our adopted dithering strategy consists of a minimum of 5 exposures and is based on the wide patterns provided in the ISR WFC3 2016-14 (Supplemental Dither Patterns for WFC3/IR; Anderson 2016). We have considered the ramifications of reduced-gyro operations on our program. We do not expect any major impediments to our science if another gyroscope failure occurs. However, in the event of such a failure, we will re-evaluate our observing plan based on the latest documentation by the WFC3 instrument team. Our team consists of leading experts on multi-wavelength studies of AGN/quasars and their connection to galaxy evolution. PI K. Nyland has previously used archival HST data to study nearby AGN (Nyland et al. 2012, 2017b) and has been a co-I on multiple successful HST proposals. K. Nyland also has experience using The Tractor imaging modeling software to perform optical and NIR forced photometry with PSF modeling, and has applied this technique to large multi-band surveys (Nyland et al. 2017c). co-I's M. Lacy, H. Schmitt, J. Greene, M. Whittle, A. Goulding, S. Johnson, V. Baldassare, and S. van Velzen are HST experts. Members of our team have extensive experience with PSF modeling in the optical/NIR (e.g. Lacy et al. 2018), including direct experience modeling the PSF of WFC3 (Baldassare et al. 2017; Stone & van Velzen 2016; Glikman et al. 2015). D. Dong, H. Guo, S. van Velzen, and T. Maccarone are experts in time domain astrophysics and are supporting on-going studies of the (currently slowly-varying) light curves of the targets in our sample. PI K. Nyland and co-I's M. Lacy, P. Patil, T. Clarke, A. Kimball, I. Yoon, and S. Giacintucci are radio/mm experts. P. Patil is an expert on young jets and also has experience using multi-band WFC3 imaging for stellar population analyses using the Propsector SED modeling software. co-I's A. Goulding, T. Clarke, T. Maccarone, and V. Baldassare are X-ray experts and will support the analysis of approved Chandra observations that are currently in progress. 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