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• W2964454498 abstract "We collect new and archival optical observations of nine black-widow millisecond pulsar binaries. New measurements include direct imaging with the Keck, Gemini-S, MDM, and Las Cumbres Observatory 2 m telescopes. This is supplemented by synthesized colors from Keck long-slit spectra. Four black-widow optical companions are presented here for the first time. Together these data provide multicolor photometry covering a large fraction of the orbital phase. We fit these light curves with a direct (photon) heating model using a version of the ICARUS light-curve modeling code. The fits provide distance and fill-factor estimates, inclinations, and heating powers. We compare the heating powers with the observed GeV luminosities, noting that the ratio is sensitive to pulsar distance and to the gamma-ray beaming. We make a specific correction for outer gap model beams, but even then some sources are substantially discrepant, suggesting imperfect beaming corrections and/or errors in the fit distance. The fits prefer large metal abundance for half of the targets, a reasonable result for these wind-stripped secondaries. The companion radii indicate substantial Roche-lobe filling, fc ≈ 0.7−1 except for PSR J0952−0607, which with fc < 0.5 has a companion density ρ ≈ 10 g cm−3, suggesting unusual evolution. We note that the direct-heating fits imply large heating powers and rather small inclinations, and we speculate that unmodeled effects can introduce such bias." @default.
• W2964454498 created "2019-08-13" @default.
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• W2964454498 date "2019-09-25" @default.
• W2964454498 modified "2023-10-16" @default.
• W2964454498 title "Multiband Optical Light Curves of Black-widow Pulsars" @default.
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• W2964454498 doi "https://doi.org/10.3847/1538-4357/ab378b" @default.
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