J0453+1559: A Neutron Star - White Dwarf Binary from a Thermonuclear Electron-capture Supernova?

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  • Thomas M. Tauris
  • Hans-Thomas Janka, Max Planck Inst Astrophys, Max Planck Society

The compact binary radio pulsar system J0453+1559 consists of a recycled pulsar as primary component of 1.559(5) M and an unseen companion star of 1.174(4) M. Because of the relatively large orbital eccentricity of e=0.1125, it was argued that the companion is a neutron star (NS), making it the NS with the lowest accurately determined mass to date. However, a direct observational determination of the nature of the companion is currently not feasible. Moreover, state-of-the-art stellar evolution and supernova modeling are contradictory concerning the possibility of producing such a low-mass NS remnant. Here we challenge the NS interpretation by reasoning that the lower-mass component could instead be a white dwarf born in a thermonuclear electron-capture supernova (tECSN) event, in which oxygen?neon deflagration in the degenerate stellar core of an ultra-stripped progenitor ejects several 0.1 M of matter and leaves a bound ONeFe white dwarf as the second-formed compact remnant. We determine the ejecta mass and remnant kick needed in this scenario to explain the properties of PSRJ0453+1559 by a NS?white dwarf system. More work on tECSNe is needed to assess the viability of this scenario.

Original languageEnglish
Article number20
JournalAstrophysical Journal Letters
Number of pages5
Publication statusPublished - 20 Nov 2019

    Research areas

  • Late stellar evolution, Neutron stars, White dwarf stars, Compact binary stars, Supernovae, Binary pulsars, Supernova remnants, EQUATION-OF-STATE, MASS, EXPLOSION, EVOLUTION, PROGENITORS, DYNAMICS, PULSAR, SINGLE

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