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Constraining Hadronic Superfluidity with Neutron Star Precession
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I show that the standard picture of the neutron star core containing coexisting neutron and proton superfluids, with the proton component forming a type II superconductor threaded by flux tubes, is inconsistent with observations of long-period (~1 yr) precession in isolated pulsars. I conclude that either the two superfluids coexist nowhere in the stellar core, or the core is a type I superconductor rather than type II. Either possibility would have interesting implications for neutron star cooling and theories of spin jumps (glitches).
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Revealing the internal magnetic field configuration of magnetars via their associated periodic signals
Using observed precession periods and surface temperatures, the authors constrain the internal fields of four magnetars and two FRB hosts, finding toroidal field strengths of order 10^15 G and a toroidal distribution ...
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