Long-period Pulsars as Possible Outcomes of Supernova Fallback Accretion

Abstract For about half a century, the radio pulsar population was observed to spin in ∼0.002–12 s range, with different classes having spin-period evolution that differs substantially depending on their magnetic fields or past accretion history. The recent detection of several slowly rotating pulsars has reopened long-standing question exact physics, and observational biases, driving upper bound period range population. In this work, we perform parameter study interacting supernova fallback matter specifically look at disk scenario. Depending initial conditions formation, can differ from typical dipolar spin-down, resulting show periods longer than coeval peers. By using general assumptions for field birth, rates, including decay, find very long (≳100 s) be reached presence strong, magnetar-like (≳10 14 G) moderate rates (∼10 22 −10 27 g −1 ). addition, cases two recently discovered periodic sources, PSR J0901–4046 ( P = 75.9 transient GLEAM-X J162759.5–523504.3 1091 s), light our model. We conclude scenario could represent viable channel produce long-period isolated only observation campaigns are starting unveil.