Purple Mountain Observatory

Iron Isotope Fractionation on Vesta Driven by Magma Ocean Process

Abstract Magma oceans represent a pivotal stage in the early evolution of terrestrial planets. Early‐formed asteroids, driven by the decay of 26 Al, may have also experienced such magma ocean processes. To investigate potential magma ocean differentiation on asteroid 4 asteroids,...

Satellite identification and attitude measurement using a multi-reflector laser ranging beacon

Passive identification and attitude measurement of spacecraft are key challenges in space traffic management. Satellite laser ranging offers high accuracy, and using corner cube reflectors as passive beacons brings the benefits of light weight and long lifetime. Based on a specif...

New constraints on cosmic-ray boosted sub-Gev dark matter via light mediators

Abstract Traditional direct detection experiments lack the sensitivity to probe the sub-GeV dark matter(DM), primarily due to the low energy of the expected nuclear recoils. In this work, we investigate cosmic-ray (CR) upscattering as a mechanism to accelerate DM particles to det...

Gas absorption of soft X-rays strongly impacts the redshift distribution of dark Fast X-ray Transients

Abstract The progenitors of many Fast X-ray Transients (FXTs) and those of γ-ray bursts (GRBs) are strongly linked. Given that ”dark” GRBs are typically found to be events suffering from enhanced extinction in the host galaxy, we investigate the nature of ”dark” FXTs. However, un...