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• W2890139712 abstract "We are monitoring established and putative redback millisecond pulsars (MSPs) in time-series photometry, repeatedly covering their 5-6 hr orbital light curves in $r^{prime}$ or $R$. On timescales of months, PSR J1048+2339 and XMMU J083850.38$-$282756.8 exhibit similar variability of $approx0.3$ mag on the heated side of the companion star. However, the heating light curve is rarely symmetric, suggesting that the intrabinary shock generated by the pulsar wind is skewed in addition to being variable, or that changing magnetic fields intrinsic to the companion channel the pulsar wind. In addition to this variable heating, there are long-lived flaring states that increase the brightness by an additional 0.5 mag, with variability on $approx10$ minute timescales. These flares also appear to originate on the heated side of the companion, while the night-side brightness remains relatively stable. Somewhat less active, PSR J1628$-$3205 has an optical light curve that is dominated by tidal distortion (ellipsoidal modulation), although it too shows evidence of variable and asymmetric heating due to shifting magnetic fields or migrating star spots. These effects frustrate any effort to derive system parameters such as inclination angle and Roche-lobe filling factor from optical light curves of redback MSPs. We also report on two Chandra X-ray observations of PSR J1048+2339 that show strong orbital modulation, possibly due to beaming along the intrabinary shock, and a third observation that is dominated by flaring. The peak flare luminosity in the 0.3-8 keV band is $approx12%$ of the pulsar's spin-down power, which may require magnetic reconnection. None of these three systems has yet shown a transition back to an accreting state." @default.
• W2890139712 created "2018-09-27" @default.
• W2890139712 creator A5044016014 @default.
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• W2890139712 date "2018-10-15" @default.
• W2890139712 modified "2023-09-26" @default.
• W2890139712 title "Variable Heating and Flaring of Three Redback Millisecond Pulsar Companions" @default.
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• W2890139712 doi "https://doi.org/10.3847/1538-4357/aade92" @default.
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