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Title: Origin of neutron star birth kicks and spins
Plain: Neutron stars are born moving hundreds of times faster than a rifle bullet and spinning, possibly because the explosion is lopsided.
Precise: Determine whether asymmetric mass ejection (gravitational tug of slow ejecta) and anisotropic neutrino emission in 3D explosions reproduce the pulsar velocity distribution (mean $\sim 4e7\ \mathrm{cm/s}$, tail above 1e8 cm/s), birth spin periods (tens to hundreds of ms) and any spin-kick alignment. Answer: predicted distributions from simulation suites compared with pulsar proper motions.
Settled by: Simulated kick and spin distributions statistically matching pulsar data, and remnant ejecta asymmetries (for example Ti-44 maps) correlated with kick direction.
Kind: well-posed
Answer type: mechanism
References: (empty)
Literature status: partially-resolved
Status note: (empty)
Posed since: (empty)