Revisiting $\gamma$-Ray Orbital Modulation in the Redback Millisecond Pulsar PSR J2039-5617

Mengqing Zhang, Shengbin Pei, Shan Chang +1

PSR J2039-5617 is a redback millisecond pulsar binary system consisting of a compact star with a mass of 1.1-1.6 $M_{\odot }$ and a low-mass companion of 0.15-0.22 $M_{\odot }$. For this…