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- W3007646453 abstract "We present a model for atmospheric wind circulation in binary millisecond pulsar (MSP) companions, showing how the optical light curve (LC) and radial velocities (RV) are sensitive to the wind flow, causing LC orbital phase shifts and asymmetries, as observed for several `spider' MSP. Velocity widths of spectral lines offer additional opportunities for measuring surface wind speed. As examples, we fit optical data for a black widow pulsar J1959+2048 and a redback pulsar J2215+5135; the wind heating models (WH) are statistically strongly preferred over direct heating (DH) for both objects, although the latter is even better fit with a heated spot. In general, WH effects tend to increase the inferred orbital inclination $i$ and decrease the inferred companion center-of-mass radial velocity amplitude $K_mathrm{c}$; both effects decrease the inferred neutron star mass. Even with such a decrease, we find large masses for the two neutron stars: $2.18pm0.09M_odot$ and $2.28^{+0.10}_{-0.09}M_odot$, respectively (for the modest surface speeds fit from the bulk heat flow; supersonic photospheric winds can slightly change these values). These are among the highest masses known, and our improved modeling increases confidence that the results are important for understanding the dense matter equation of state." @default.
- W3007646453 created "2020-03-06" @default.
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- W3007646453 date "2020-04-02" @default.
- W3007646453 modified "2023-09-25" @default.
- W3007646453 title "Atmospheric Circulation on Black Widow Companions" @default.
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- W3007646453 doi "https://doi.org/10.3847/1538-4357/ab7b62" @default.
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