Adiabatic-radiative shock systems in YSO jets and novae outflows

0557219 - ASÚ 2023 RIV FR eng J - Článek v odborném periodiku
del Valle, M. - Araudo, Anabella - Suzuki-Vidal, F.
Adiabatic-radiative shock systems in YSO jets and novae outflows.
Astronomy & Astrophysics. Roč. 660, April (2022), č. článku A104. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GA20-19854S
Institucionální podpora: RVO:67985815
Klíčová slova: rs-ophiuchi * particle-acceleration * astrophysical jets
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 6.5, rok: 2022
Způsob publikování: Open access s časovým embargem
https://doi.org/10.1051/0004-6361/202142017

We aim to study the combination of adiabatic and radiative shocks in protostellar jets and novae outflows. We focus on determining the conditions under which this combination is feasible together with its physical implications. Methods. We performed an analytical study of the shocks in both types of sources for a set of parameters by comparing cooling times and propagation velocities. We also estimated the timescales for the growth of instabilities in the contact discontinuity separating both shocks. We studied the hydrodynamical evolution of a jet colliding with an ambient medium with 2D numerical simulations, confirming our initial theoretical estimates. We show that for a wide set of observationally constrained parameters, the combination of an adiabatic and a radiative shock is possible at the working surface of the termination region in jets from young stars and novae outflows. We find that instabilities are developed at the contact discontinuity, mixing the shocked materials. Additionally, we explore the magnetohydrodynamic parameter scaling required for studying protostellar jets and novae outflows using laboratory experiments on laser facilities. The coexistence of an adiabatic and a radiative shock is expected at the termination region of protostellar jets and novae outflows. This scenario is very promising for particle acceleration and gamma-ray emission. The parameters for scaled laboratory experiments are very much in line with plasma conditions achievable in currently operating high-power laser facilities. This provides a new means for studying novae outflows that has never been considered before.
Trvalý link: http://hdl.handle.net/11104/0331641