The observed neutron star mass distribution as a probe of the supernova explosion mechanism

Abstract

The observed distribution of neutron star (NS) masses reflects the physics of core-collapse supernova explosions and the structure of the massive stars that produce them at the end of their evolution. We present a Bayesian analysis that directly compares the NS mass distribution observed in double NS systems to theoretical models of NS formation. We find that models with standard binary mass ratio distributions are strongly preferred over independently picking the masses from the initial mass function, although the strength of the inference depends on whether current assumptions for identifying the remnants of the primary and secondary stars are correct. Second, NS formation models with no mass fallback are favored because they reduce the dispersion in NS masses. The double NS system masses thus directly point to the mass coordinate where the supernova explosion was initiated, making them an excellent probe of the supernova explosion mechanism. If we assume no fallback and simply vary the mass coordinate separating the remnant and the supernova ejecta, we find that for solar metallicity stars the explosion most likely develops at the edge of the iron core at a specific entropy of about 2.8 k_B. The primary limitations of our study are the poor knowledge of the supernova explosion mechanism and the lack of broad range of SN model explosions of LMC to solar metallicity.

14 pages, 7 figures, 2 tables. Accepted for publication in MNRAS. Added an appendix discussing the remnant mass distribution of Ugliano et al. (arXiv:1205.3657). For a brief video explaining the key results of this paper, see http://youtu.be/dI0S6OFMwE8

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• The Landscape of the Neutrino Mechanism of Core-Collapse Supernovae: Neutron Star and Black Hole Mass Functions, Explosion Energies and Nickel Yields
• The First Two Years of Electromagnetic Follow-Up with Advanced LIGO and Virgo
• On The Intrinsic Diversity of Type II-Plateau Supernovae
• Constraints on Core Collapse from the Black Hole Mass Function
• A Global Model of The Light Curves and Expansion Velocities of Type II-Plateau Supernovae
• The Black Hole Formation Probability
• Characterizing Astrophysical Binary Neutron Stars with Gravitational Waves
• The effect of spin mismodeling on gravitational-wave measurements of the binary neutron star mass distribution
• The Explosion Mechanism of Core-Collapse Supernovae and Its Observational Signatures
• Mass measurements of the double neutron star system PSR J0641+0448