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Do electron-capture supernovae make neutron stars? First multidimensional hydrodynamic simulations of the oxygen deflagration

Jones, S.; Röpke, Friedrich K.; Pakmor, R; Seitenzahl, Ivo; Ohlmann, Sebastian T.; Edelmann, P. V. F.

Description

Context. In the classical picture, electron-capture supernovae and the accretion-induced collapse of oxygen-neon white dwarfs undergo an oxygen deflagration phase before gravitational collapse produces a neutron star. These types of core collapse events are postulated to explain several astronomical phenomena. In this work, the oxygen deflagration phase is simulated for the first time using multidimensional hydrodynamics. Aims. By simulating the oxygen deflagration with multidimensional...[Show more]

dc.contributor.authorJones, S.
dc.contributor.authorRöpke, Friedrich K.
dc.contributor.authorPakmor, R
dc.contributor.authorSeitenzahl, Ivo
dc.contributor.authorOhlmann, Sebastian T.
dc.contributor.authorEdelmann, P. V. F.
dc.date.accessioned2018-11-29T22:51:59Z
dc.date.available2018-11-29T22:51:59Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/152043
dc.description.abstractContext. In the classical picture, electron-capture supernovae and the accretion-induced collapse of oxygen-neon white dwarfs undergo an oxygen deflagration phase before gravitational collapse produces a neutron star. These types of core collapse events are postulated to explain several astronomical phenomena. In this work, the oxygen deflagration phase is simulated for the first time using multidimensional hydrodynamics. Aims. By simulating the oxygen deflagration with multidimensional hydrodynamics and a level-set-based flame approach, new insights can be gained into the explosive deaths of 8−10 M⊙ stars and oxygen-neon white dwarfs that accrete material from a binary companion star. The main aim is to determine whether these events are thermonuclear or core-collapse supernova explosions, and hence whether neutron stars are formed by such phenomena. Methods. The oxygen deflagration is simulated in oxygen-neon cores with three different central ignition densities. The intermediate density case is perhaps the most realistic, being based on recent nuclear physics calculations and 1D stellar models. The 3D hydrodynamic simulations presented in this work begin from a centrally confined flame structure using a level-set-based flame approach and are performed in 2563 and 5123 numerical resolutions. Results. In the simulations with intermediate and low ignition density, the cores do not appear to collapse into neutron stars. Instead, almost a solar mass of material becomes unbound from the cores, leaving bound remnants. These simulations represent the case in which semiconvective mixing during the electron-capture phase preceding the deflagration is inefficient. The masses of the bound remnants double when Coulomb corrections are included in the equation of state, however they still do not exceed the effective Chandrasekhar mass and, hence, would not collapse into neutron stars. The simulations with the highest ignition density (log 10ρc = 10.3), representing the case where semiconvective mixing is very efficient, show clear signs that the core will collapse into a neutron star.
dc.format.mimetypeapplication/pdf
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.titleDo electron-capture supernovae make neutron stars? First multidimensional hydrodynamic simulations of the oxygen deflagration
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume593
dc.date.issued2016
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationa383154xPUB4407
local.type.statusPublished Version
local.contributor.affiliationJones, S., Heidelberg Institute for Theoretical Studies
local.contributor.affiliationRöpke, Friedrich K., Zentrum für Astronomie der Universität Heidelberg
local.contributor.affiliationPakmor, R, Heidelberg Institute for Theoretical Studies
local.contributor.affiliationSeitenzahl, Ivo, College of Science, ANU
local.contributor.affiliationOhlmann, Sebastian T., Heidelberger Institut fur Theoretische Studien
local.contributor.affiliationEdelmann, P. V. F., Heidelberg Institute for Theoretical Studies
local.bibliographicCitation.issueA72
local.identifier.doi10.1051/0004-6361/201628321
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:42:28Z
local.identifier.scopusID2-s2.0-84989968083
local.identifier.thomsonID000385820100057
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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