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WE PROPOSE A COORDINATED X-RAY/UV/OPTICAL CAMPAIGN TO STUDY THE VIOLENT FLARING ACTIVITY RECENTLY DISCOVERED IN THE EVAPORATING BINARY MILLISECOND PULSAR PSR J1311$-$3430. THIS $ GAMMA$-RAY BINARY SPORTS THE SHORTEST PULSAR ORBITAL PERIOD THE STRONGEST PULSAR-DRIVEN WIND AND ONE OF THE HIGHEST NEUTRON STAR/COMPANION MASS RATIOS KNOWN. THE STRONG AND FREQUENT FLARES COMPLICATE STUDY OF THE QUIESCENT LIGHT CURVE AND AFFECT THE ENERGY TRANSFER FROM THE MSP. OUR CAMPAIGN PROBES THE SPECTRAL AND ORBITAL PHASE DISTRIBUTION OF THESE FLARES REVEALING THEIR LOCATION SIZE AND RADIATION PHYSICS. IN TURN THIS PROVIDES A KEY TO UNDERSTANDING THIS EXTREME SYSTEM AND COMPANION-EVAPORATING PULSARS AS A CLASS.

$42,256FY2020National Aeronautics and Space AdministrationNASA

The Leland Stanford Junior University

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