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Adiabatic-radiative shock systems in YSO jets and novae outflows
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SYSNO ASEP 0557219 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Adiabatic-radiative shock systems in YSO jets and novae outflows Author(s) del Valle, M. (BR)
Araudo, Anabella (ASU-R) ORCID
Suzuki-Vidal, F. (GB)Number of authors 3 Article number A104 Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 660, April (2022)Number of pages 10 s. Publication form Print - P Language eng - English Country FR - France Keywords rs-ophiuchi ; particle-acceleration ; astrophysical jets Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA20-19854S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access with time embargo (01.05.2023) Institutional support ASU-R - RVO:67985815 UT WOS 000783951200011 EID SCOPUS 85128859010 DOI 10.1051/0004-6361/202142017 Annotation 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2023 Electronic address https://doi.org/10.1051/0004-6361/202142017
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