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2. BOW SHOCK FRAGMENTATION DRIVEN BY A THERMAL INSTABILITY IN LABORATORY ASTROPHYSICS EXPERIMENTS

Author

Edward Hansen, Rafael L. Rodríguez, P. de Grouchy, G. C. Burdiak, Andrea Ciardi, M. Bennett, Lee Suttle, Alejandro Frank, Francisco Suzuki-Vidal, Sergey Lebedev, Louisa Pickworth, J. Music, Jonathan Skidmore, Gareth Hall, George Swadling, Patrick Hartigan, G. Espinosa, J.M. Gil, S. N. Bland, The Royal Society, Blackett Laboratory, Imperial College London, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Institut de signalisation, biologie du développement et cancer (ISBDC), Centre National de la Recherche Scientifique (CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Universidad Nacional Autónoma de México (UNAM), École normale supérieure - Paris (ENS-PSL), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), and Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM)

Subjects
Shock wave, Radiative cooling, 0306 Physical Chemistry (Incl. Structural), Young stellar object, Astrophysics::High Energy Astrophysical Phenomena, PROPER MOTIONS, PLASMAS, FOS: Physical sciences, Astronomy & Astrophysics, HERBIG-HARO OBJECTS, Instability, 0305 Organic Chemistry, methods: laboratory: atomic, physics.plasm-ph, Radiative transfer, Supersonic speed, Herbig–Haro object, Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Science & Technology, NUMERICAL SIMULATIONS, Astronomy and Astrophysics, Mechanics, Plasma, shock waves, HUBBLE-SPACE-TELESCOPE, J.2.1, J.2.9, PROTOSTELLAR JETS, Physics - Plasma Physics, Plasma Physics (physics.plasm-ph), 85-05, 0201 Astronomical And Space Sciences, ISM: jets and outflows, Space and Planetary Science, instabilities, DENSITY, Physical Sciences, OPTICALLY THIN, SUPERSONIC JETS, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], RADIATIVE SHOCKS
Abstract

The role of radiative cooling during the evolution of a bow shock was studied in laboratory-astrophysics experiments that are scalable to bow shocks present in jets from young stellar objects. The laboratory bow shock is formed during the collision of two counter-streaming, supersonic plasma jets produced by an opposing pair of radial foil Z-pinches driven by the current pulse from the MAGPIE pulsed-power generator. The jets have different flow velocities in the laboratory frame and the experiments are driven over many times the characteristic cooling time-scale. The initially smooth bow shock rapidly develops small-scale non-uniformities over temporal and spatial scales that are consistent with a thermal instability triggered by strong radiative cooling in the shock. The growth of these perturbations eventually results in a global fragmentation of the bow shock front. The formation of a thermal instability is supported by analysis of the plasma cooling function calculated for the experimental conditions with the radiative packages ABAKO/RAPCAL., 9 pages, 5 figures, Accepted for publication in The Astrophysical Journal on 5th November 2015

Published
2015
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