On the formation of eccentric millisecond pulsars with helium white-dwarf companions

Abstract

Millisecond pulsars (MSPs) orbiting helium white dwarfs (WDs) in eccentric orbits challenge the established binary evolution paradigm that predicts efficient orbital circularization during the mass transfer episode that spins up the pulsar. Freire and Tauris (2014) recently proposed that these binary MSPs may instead form from the rotationally delayed accretion-induced collapse of a massive WD. This scenario predicts that eccentric systems preferably host low-mass pulsars and travel with small systemic velocities - in tension with new observational constraints. Here, I show that a substantial growth in eccentricity may alternatively arise from the dynamical interaction of the binary with a circumbinary disk. Such a disk may form from ejected donor material during hydrogen flash episodes, when the neutron star is already an active radio pulsar and tidal forces can no longer circularize the binary. I demonstrate that a short-lived ($10^4-10^5$ \,yr) disk can result to eccentricities of $e\sim 0.01-0.15$ for orbital periods between 15 and 50 days. Finally, I propose that, more generally, the disk hypothesis may explain the lack of circular binary pulsars for the aforementioned orbital-period range.

arXiv commentTo appear in The Astrophysical Journal Letters. 5 pages in emulateapj format, 3 figures, 1 table. v2: Minor changes made to match the Journal version. Comments are welcome

References in corpus (26)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• On the theory of disc photoevaporation
• On the nature and evolution of the unique binary pulsar J1903+0327
• Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
• Accretion into the Central Cavity of a Circumbinary Disk
• New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
• Multi-Dimensional Simulations of the Accretion-Induced Collapse of White Dwarfs to Neutron Stars
• Planck 2013 results. XIII. Galactic CO emission
• Circumbinary MHD Accretion into Inspiraling Binary Black Holes
• An Eccentric Binary Millisecond Pulsar in the Galactic Plane
• Formation of black widows and redbacks -- two distinct populations of eclipsing binary millisecond pulsars
• The Northern High Time Resolution Universe Pulsar Survey I: Setup and initial discoveries
• Spin-Down of Radio Millisecond Pulsars at Genesis
• The timescale of low-mass proto-helium white dwarf evolution
• Goals, Strategies and First Discoveries of AO327, the Arecibo All-Sky 327 MHz Drift Pulsar Survey
• Direct formation of millisecond pulsars from rotationally delayed accretion-induced collapse of massive white dwarfs
• PSR J1740-5340: accretion inhibited by radio-ejection in a binary millisecond pulsar in the Globular Cluster NGC 6397
• The formation of the eccentric-orbit millisecond pulsar J1903+0327 and the origin of single millisecond pulsars
• Recycled Pulsars Discovered at High Radio Frequency
• On the non-detection of gamma-rays from energetic millisecond pulsars -- dependence on viewing geometry
• Radio-ejection and bump-related orbital period gap of millisecond binary pulsars

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