A dead star racing through space can sprout wings of invisible energy that signal a massive collision is coming.
April 29, 2026
Original Paper
Alfven-winged pulsar
arXiv · 2604.23870
The Takeaway
A pulsar moving through the magnetic field of a companion star creates powerful electrical currents called Alfven wings. These currents generate a specific beamed signal that looks like a pulsar but is driven by the motion of the two stars together. This Alfven-winged pulsar acts as a natural alarm bell for an impending cosmic merger. Detecting these signals would give astronomers a head-start to point their telescopes before a massive gravitational wave event occurs. It reveals a completely new way for the universe to signal its most violent and exciting moments.
From the abstract
Detecting possible electromagnetic precursors to the gravitational signal from merging compact objects is challenging, but it can reveal intricate physical properties of the merging stars through their gravitational and electromagnetic interactions. We demonstrate, using 3D Particle-In-Cell simulations, that a neutron star moving through the magnetosphere of a merging companion generates a complicated system of dissipative currents, a relativistic analogue of planetary Alfven wings. Generated el