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.

arXiv commentMatches published version. Some notations changed

References in corpus (43)

• 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
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The ATNF Pulsar Catalogue
• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption
• Giant Planets at Small Orbital Distances
• Measured Mass Loss Rates of Solar-like Stars as a Function of Age and Activity
• Evolution of "51Peg b-like" Planets
• The High Time Resolution Universe Pulsar Survey I: System configuration and initial discoveries
• The rotation and Galactic kinematics of mid M dwarfs in the Solar Neighborhood
• The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars
• Transformation of a Star into a Planet in a Millisecond Pulsar Binary
• Formation of black widows and redbacks -- two distinct populations of eclipsing binary millisecond pulsars
• Discovery of the Optical Counterparts to Four Energetic Fermi Millisecond Pulsars
• Magnetic field strengths of hot Jupiters from signals of star-planet interactions
• A Brown Dwarf Companion for the Accreting Millisecond Pulsar SAX J1808.4-3658
• The Color-Period Diagram and Stellar Rotational Evolution - New Rotation Period Measurements in the Open Cluster M34
• Surrounded by Spiders! New Black Widows and Redbacks in the Galactic Field
• Intra-Binary Shock Heating of Black Widow Companions
• Thermal Structure and Radius Evolution of Irradiated Gas Giant Planets
• Understanding the evolution of close binary systems with radio pulsars
• Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium
• Stability and Evolution of Supernova Fallback Disks
• Estimating the magnetic field strength in hot Jupiters
• The Metastable Dynamo Model of Stellar Rotational Evolution
• Extended Heat Deposition in Hot Jupiters: Application to Ohmic Heating
• Evolutionary trajectories of ultra-compact "black widow" pulsars with very low mass companions
• Atmospheric Circulation on Black Widow Companions
• The High Time Resolution Universe Survey II: Discovery of 5 Millisecond Pulsars
• Multiband Optical Light Curves of Black-Widow Pulsars
• PSR J2322$-$2650 -- A low-luminosity millisecond pulsar with a planetary-mass companion
• Black widow evolution: magnetic braking by an ablated wind
• Merger of a White Dwarf-Neutron Star Binary to $10^{29}$ Carat Diamonds: Origin of the Pulsar Planets
• Accretion-induced Collapse from Magnetic White Dwarf Binaries and Formation of Binary Millisecond Pulsars: Redbacks and Black Widows
• A model for redistributing heat over the surface of irradiated spider companions
• 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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