Fluid Dynamics of Stellar Jets in Real Time: Third Epoch HST Images of HH 1, HH 34, and HH 47
P. Hartigan, A. Frank, J. M. Foster, B. H. Wilde, M. Douglas, P. A., Rosen, R. F. Coker, B. E. Blue, J. F. Hansen

TL;DR
This study uses high-resolution, multi-epoch HST images to analyze the hydrodynamical and radiative evolution of stellar jets, revealing clumpy structures, shock interactions, and jet-environment interactions over time.
Contribution
First detailed time-domain analysis of stellar jets combining high-resolution imaging with hydrodynamical insights, highlighting clumpiness and shock dynamics.
Findings
Jets are highly heterogeneous with small-scale clumps.
Shock waves form and fade as material interacts with surroundings.
Evidence of shear and Mach stems in jet structures.
Abstract
We present new, third-epoch HST H-alpha and [S II] images of three HH jets (HH 1 and 2, HH 34, and HH 47) and compare these images with those from the previous epochs. The high-spatial resolution, coupled with a time-series whose cadence is of order both the hydrodynamical and radiative cooling timescales of the flow allows us to follow the hydrodynamical/magnetohydrodynamical evolution of an astrophysical plasma system in which ionization and radiative cooling play significant roles. Cooling zones behind the shocks are resolved, so it is possible to identify which way material flows through a given shock wave. The images show that heterogeneity is paramount in these jets, with clumps dominating the morphologies of both bow shocks and their Mach disks. This clumpiness exists on scales smaller than the jet widths and determines the behavior of many of the features in the jets. Evidence…
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