Laser experiment for the study of accretion dynamics of Young Stellar Objects: Design and scaling

Revet, G.; Khiar, B.; Béard, J.; Bonito, R.; Orlando, S.; Starodubtsev, M.; Ciardi, A.; Fuchs, Julien

doi:10.1016/j.hedp.2019.100711

Cited by 5 publications

(6 citation statements)

References 32 publications

(54 reference statements)

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“…The plasma in the experiment was shown to be scalable to acretion events on a young star (Ryutov et al 2000). We verified in particular that our setup is representative of a high plasma β (≥1) Classical T Tauri Stars (CTTSs) accretion case (Revet et al 2019). We experimentally demonstrated the formation of a shell of dense (and optically thick when scaled to astrophysical conditions) plasma that envelopes the core's post-shock region and absorbs the Xrays arising from the central core.…”

Section: Introductionmentioning

confidence: 61%

Laboratory evidence for an asymmetric accretion structure upon slanted matter impact in young stars

Burdonov

Revet

Bonito

et al. 2020

A&A

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Aims. Investigating the process of matter accretion onto forming stars through scaled experiments in the laboratory is important in order to better understand star and planetary system formation and evolution. Such experiments can indeed complement observations by providing access to the processes with spatial and temporal resolution. A previous investigation revealed the existence of a two-component stream: a hot shell surrounding a cooler inner stream. The shell was formed by matter laterally ejected upon impact and refocused by the local magnetic field. That laboratory investigation was limited to normal incidence impacts. However, in young stellar objects, the complex structure of magnetic fields causes variability of the incident angles of the accretion columns. This led us to undertake an investigation, using laboratory plasmas, of the consequence of having a slanted accretion impacting a young star. Methods. Here, we used high power laser interactions and strong magnetic field generation in the laboratory, complemented by numerical simulations, to study the asymmetry induced upon accretion structures when columns of matter impact the surface of young stars with an oblique angle. Results. Compared to the scenario where matter accretes perpendicularly to the star surface, we observe a strongly asymmetric plasma structure, strong lateral ejecta of matter, poor confinement of the accreted material, and reduced heating compared to the normal incidence case. Thus, slanted accretion is a configuration that seems to be capable of inducing perturbations of the chromosphere and hence possibly influencing the level of activity of the corona.

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Section: Introductionmentioning

confidence: 61%

Laboratory evidence for an asymmetric accretion structure upon slanted matter impact in young stars

Burdonov

Revet

Bonito

et al. 2020

A&A

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“…The value of the laboratory magnetic field (20 T) is chosen such that the laboratory plasma Alfven number is a best compromise match between the Alfven numbers of the YSO and of the solar corona outflows. The indicated velocity ranges correspond to the minimum and maximum speed within the flow; in the laboratory case it corresponds to the ballistic behavior of the expansion 64 . In the astrophysical cases, the material composition (indicated with H) consists in fully ionized hydrogen plus a mixture of heavier elements with abundances of 0.5 compared to the solar values 65 .…”

Section: Resultsmentioning

confidence: 99%

Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field

et al. 2021

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The shaping of astrophysical outflows into bright, dense, and collimated jets due to magnetic pressure is here investigated using laboratory experiments. Here we look at the impact on jet collimation of a misalignment between the outflow, as it stems from the source, and the magnetic field. For small misalignments, a magnetic nozzle forms and redirects the outflow in a collimated jet. For growing misalignments, this nozzle becomes increasingly asymmetric, disrupting jet formation. Our results thus suggest outflow/magnetic field misalignment to be a plausible key process regulating jet collimation in a variety of objects from our Sun’s outflows to extragalatic jets. Furthermore, they provide a possible interpretation for the observed structuring of astrophysical jets. Jet modulation could be interpreted as the signature of changes over time in the outflow/ambient field angle, and the change in the direction of the jet could be the signature of changes in the direction of the ambient field.

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“… is the critical plasma density for optical radiation at the frequency L  and wavelength 2 L c     ). At the same time, this mode requires the use of much stronger magnetic fields, of the order of several tens of tesla [18][19][20]. In a dense plasma, magnetic fields of 10 T or more are required to retain the key dimensionless parameters for modeling of space phenomena [4].…”

Section: Justification Of the Parameters Of The Magnetic System For A...mentioning

confidence: 99%

Pulsed magnetic field generation system for laser-plasma research

Лучинин¹,

Малышев²,

Kopelovich³

et al. 2021

Review of Scientific Instruments

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An up to 15 T pulsed magnetic field generator in a volume of a few cubic centimeters has been created for experiments with magnetized laser plasma. The magnetic field is created by a pair of coils placed in a sealed reservoir with liquid nitrogen, which is installed in a vacuum chamber with a laser target. The bearing body provides the mechanical strength of the system both in the case of co-directional and oppositely connected coils. The configuration of the housing allows laser radiation to be introduced into the working area between the coils in a wide range of directions and focusing angles, to place targets away from the symmetry axis of the magnetic system, and to irradiate several targets simultaneously.

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Laser experiment for the study of accretion dynamics of Young Stellar Objects: Design and scaling

Cited by 5 publications

References 32 publications

Laboratory evidence for an asymmetric accretion structure upon slanted matter impact in young stars

Laboratory evidence for an asymmetric accretion structure upon slanted matter impact in young stars

Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field

Pulsed magnetic field generation system for laser-plasma research

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