2019ApJ...886L..20T -
Astrophys. J., 886, L20-L20 (2019/November-3)
J0453+1559 a neutron star-white dwarf binary from a thermonuclear electron-capture supernova?
TAURIS T.M. and JANKA H.-T.
Abstract (from CDS):
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 PSR J0453+1559 by a NS-white dwarf system. More work on tECSNe is needed to assess the viability of this scenario.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Late stellar evolution - Neutron stars - White dwarf stars - Compact binary stars - Supernovae - Binary pulsars - Supernova remnants
Simbad objects:
2
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2019ApJ...886L..20T and select 'bookmark this link' or equivalent in the popup menu