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  Magnetar formation through a convective dynamo in protoneutron stars

Raynaud, R., Guilet, J., Janka, H.-T., & Gastine, T. (2020). Magnetar formation through a convective dynamo in protoneutron stars. Science Advances, 6(11): eaay2732. doi:10.1126/sciadv.aay2732.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-79BB-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-79BC-F
Genre: Journal Article

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Magnetar formation through a convective dynamo in protoneutron stars.pdf (Any fulltext), 709KB
 
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Raynaud, Raphaël, Author
Guilet, Jérôme, Author
Janka, Hans-Thomas1, Author              
Gastine, Thomas, Author
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: The release of spin-down energy by a magnetar is a promising scenario to power several classes of extreme explosive transients. However, it lacks a firm basis because magnetar formation still represents a theoretical challenge. Using the first three-dimensional simulations of a convective dynamo based on a protoneutron star interior model, we demonstrate that the required dipolar magnetic field can be consistently generated for sufficiently fast rotation rates. The dynamo instability saturates in the magnetostrophic regime with the magnetic energy exceeding the kinetic energy by a factor of up to 10. Our results are compatible with the observational constraints on galactic magnetar field strength and provide strong theoretical support for millisecond protomagnetar models of gamma-ray burst and superluminous supernova central engines.

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 Dates: 2020-03-13
 Publication Status: Published online
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 Identifiers: DOI: 10.1126/sciadv.aay2732
Other: LOCALID: 3235725
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 6 (11) Sequence Number: eaay2732 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548