Black widow formation by pulsar irradiation and sustained magnetic braking

Abstract

Black widows are millisecond pulsars with low-mass companions, a few per cent the mass of the sun, on orbits of several hours. These companions are presumably the remnants of main sequence stars that lost their mass through a combination of Roche-lobe overflow and ablation by the host pulsar's high-energy radiation. While ablation itself is too weak to significantly reduce the mass of the companion star, the ablated wind couples to its magnetic field, removes orbital angular momentum, and thus maintains stable Roche-lobe overflow. We use the MESA stellar evolution code, complemented by analytic estimates, to track initially main sequence companions as they are reduced to a fraction of their original mass by this ablation-driven magnetic braking. We argue that magnetic braking remains effective even for low-mass companions. A key ingredient of our model is that the irradiating luminosity of the pulsar $L_{\mathrm{irr}}$ deposits energy in the companion's atmosphere and thereby slows down its Kelvin-Helmholtz cooling. We find that the high-energy luminosities measured by Fermi $L_{\mathrm{irr}}=0.1-3{\mathrm{L}}_{\odot }$ can explain the span of black widow orbital periods. The same $L_{\mathrm{irr}}$ range reproduces the companions' night-side temperatures, which cluster around 3000 K, as inferred from optical light curves.

Matches published version. Some notations changed

References in corpus (13)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The ATNF Pulsar Catalogue
• The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars
• Magnetic field strengths of hot Jupiters from signals of star-planet interactions
• Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium
• Estimating the magnetic field strength in hot Jupiters
• The Metastable Dynamo Model of Stellar Rotational Evolution
• PSR J2322$-$2650 -- A low-luminosity millisecond pulsar with a planetary-mass companion
• Merger of a White Dwarf-Neutron Star Binary to $10^{29}$ Carat Diamonds: Origin of the Pulsar Planets
• Evolution of Low-Mass X-ray Binaries: the Effect of Donor Evaporation
• Evolution of post-Accretion Induced Collapse Binaries: the Effect of Evaporation
• Identifying the formation mechanism of redback pulsars

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