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PSR J1810+1744: Companion Darkening and a Precise High Neutron Star Mass

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arxiv 2101.09822 v1 pith:T7XQUX4I submitted 2021-01-24 astro-ph.HE

Roger W. Romani , D. Kandel , Alexei V. Filippenko , Thomas G. Brink , WeiKang Zheng This is my paper · ORCID
classification astro-ph.HE
keywords darkeningcompaniongivesgravityheatingindicatesj1810light-curve
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Keck-telescope spectrophotometry of the companion of PSR J1810+1744 shows a flat, but asymmetric light-curve maximum and a deep, narrow minimum. The maximum indicates strong gravity darkening near the L_1 point, along with a heated pole and surface winds. The minimum indicates a low underlying temperature and substantial limb darkening. The gravity darkening is a consequence of extreme pulsar heating and the near-filling of the Roche lobe. Light-curve modeling gives a binary inclination i=65.7+/-0.4deg. With the Keck-measured radial-velocity amplitude K_c=462.3+/-2.2km/s, this gives an accurate neutron star mass M_NS=2.13+/-0.04M_o, with important implications for the dense-matter equation of state. A classic direct-heating model, ignoring the L_1 gravitational darkening, would predict an unphysical M_NS>3M_o. A few other ``spider" pulsar binaries have similar large heating and fill factor; thus, they should be checked for such effects.

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Cited by 2 Pith papers

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  1. Fastest spinning millisecond pulsars: indicators for quark matter in neutron stars?

    nucl-th 2024-12 conditional novelty 6.0 of 10

    Hybrid stars with color-superconducting quark matter can reproduce the mass and spin of pulsar J0952-0607, whereas the hadronic-only model cannot, and the revised Kepler-frequency relation tightens radius bounds.

  2. Rapidly Spinning Massive Pulsars as an Indicator of Quark Deconfinement

    nucl-th 2025-12 conditional novelty 4.0 of 10

    Within a tuned hybrid equation of state, a color-superconducting quark core—absent from the hyperonic hadronic model—is needed to reach the mass and spin of PSR J0952–0607.

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