A strange star scenario for the formation of eccentric millisecond pulsar PSR J1946+3417

PSR J1946+3417 is a millisecond pulsar (MSP) with spin period P ≃ 3.17 ms. Harbored in binary an orbital Pb 27 days, the MSP accompanied by white dwarf (WD). The masses of and WD were determined to be 1.83 M⊙ 0.266 M⊙, respectively. Specially, its eccentricity e 0.134, which challenging recycling model MSPs. Assuming that neutron star may collapse strange when mass reaches critical limit, we propose phase transition (PT) scenario account for origin system. sudden loss kick induced asymmetric during PT result eccentricity. If event takes place after transfer ceases, eccentric orbit cannot re-circularized Hubble time. Aiming at both components, simulate evolution progenitor via MESA. simulations show NS / main sequence initial 1.4+1.6 2.59 days will evolve into consisting 2.0 0.27 ∼21.5 days. gravitational fraction 10%, effect program BSE velocity σPT = 60 km s−1. results can reproduce observed higher probability than other values.