# Numerical Simulation of the SVS 13 Micro-Jet and Bow Shock Bubble

## TL;DR

This paper presents numerical simulations of the SVS 13 micro-jet and bow shock bubble using the WENO method, successfully reproducing observed features and dynamics consistent with Keck Telescope data.

## Contribution

The study introduces detailed WENO-based simulations that accurately model the micro-jet and bow shock bubble, matching observational data and revealing their evolution over time.

## Key findings

- Simulation reproduces observed bow shock bubble expansion and jet velocity.
- Jet penetrates and subsumes the initial bubble after about 22 years.
- Emission maps from simulations agree with Keck observations.

## Abstract

Numerical simulations are performed using the WENO method of the SVS 13 micro-jet and bow shock bubble which reproduce the main features and dynamics of Keck Telescope/OSIRIS velocity-resolved integral field spectrograph data: an expanding cooler bow shock bubble, with the bubble center moving at approximately 50 km/s with a radial expansion velocity of 11 km/s, surrounding the fast hotter jet, which is propagating at 156 km/s. Contact and bow shock waves are visible in the simulations from both the initial short jet pulse which creates the nearly spherical bow shock bubble and from the fast micro-jet, while a terminal Mach disk shock is visible near the tip of the continuous micro-jet, which reduces the jet gas velocity down to the flow velocity of the contact discontinuity at the leading edge of the jet. At 21.1 yr after the launch of the initial bubble pulse, the jet has caught up with and penetrated almost all the way across the bow shock bubble of the slower initial pulse. At times later than about 22 yr, the jet has penetrated through the bubble and thereafter begins to subsume its spherical form. Emission maps from the simulations of the jet---traced by the emission of the shock excited 1.644 micron [Fe II] line---and bow shock bubble---traced in the lower excitation 2.122 micron H_2 1--0 S(1) line---projected onto the plane of the sky are presented, and are in good agreement with the Keck observations.