Laboratory measurements of resistivity in warm dense plasmas relevant to the microphysics of brown dwarfs

Anno: 2015

Autori: Booth N., Robinson A.P.L., Hakel P., Clarke R.J., Dance R.J., Doria D., Gizzi LA., Gregori G., Koester P., Labate L., Levato T., Li B., Makita M., Mancini R.C., Pasley J., Rajeev P.P., Riley D., Wagenaars E., Waugh J.N., Woolsey N.C., Woolsey N.C.

Affiliazione autori: STFC Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England; Univ Nevada, Dept Phys, Coll Sci, Reno, NV 89557 USA; Univ York, Dept Phys, York Plasma Inst, York YO10 5DD, N Yorkshire, England; Queens Univ Belfast, Sch Math & Phys, Belfast BT1 4NN, Antrim, North Ireland; CNR, Intense Laser Irradiat Lab, Ist Nazl Ott, Area Ric, I-56124 Pisa, Italy; Univ Oxford, Dept Phys, Oxford OX4 3PU, England.

Abstract: Since the observation of the first brown dwarf in 1995, numerous studies have led to a better understanding of the structures of these objects. Here we present a method for studying material resistivity in warm dense plasmas in the laboratory, which we relate to the microphysics of brown dwarfs through viscosity and electron collisions. Here we use X-ray polarimetry to determine the resistivity of a sulphur-doped plastic target heated to Brown Dwarf conditions by an ultra-intense laser. The resistivity is determined by matching the plasma physics model to the atomic physics calculations of the measured large, positive, polarization. The inferred resistivity is larger than predicted using standard resistivity models, suggesting that these commonly used models will not adequately describe the resistivity of warm dense plasma related to the viscosity of brown dwarfs.

Giornale/Rivista: NATURE COMMUNICATIONS

Volume: 6      Da Pagina: 8742  A: 8742

Maggiori informazioni: We would like to acknowledge the support and expertise of the staff of the Central Laser Facility. This work was partially supported by the Extreme Light Infrastructure Project, the HiPER project, the United Kingdom Engineering and Physical Sciences Research Council (grant number EP/H012605/1) and the Science and Technology Facilities Council. The work of GG has received partial funding from the European Research Council under the European Community\’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 256973.
Parole chiavi: Low-mass stars; Ultrashort; Fluids and Plasma physics; Electron-trasport; T-Dwarfs
DOI: 10.1038/ncomms9742

Citazioni: 22
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-04-27
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