Roman Space Telescope could detect isolated neutron stars through gravitational microlensing
Updated
Updated · NASA · May 6
Roman Space Telescope could detect isolated neutron stars through gravitational microlensing
9 articles · Updated · NASA · May 6
Simulations in Astronomy and Astrophysics indicate the NASA mission may find and characterise dozens in the Milky Way via its Galactic Bulge Time Domain Survey.
By measuring both temporary brightening and tiny positional shifts of background stars, Roman could directly weigh otherwise unseen objects and track neutron-star speeds after supernova kicks.
Only a few thousand neutron stars are known, mostly pulsars, though the galaxy may hold tens to hundreds of millions; Roman could also clarify the mass gap between neutron stars and black holes.
What secrets will be unlocked when a new telescope uses warped spacetime to find our galaxy's hidden stellar corpses?
Will the Roman telescope's data confirm our theories of extreme matter, or reveal a new type of exotic object?
Mapping the Milky Way’s Dead Stars: Roman’s 100 Isolated Neutron Star Discoveries and Galactic Census
Overview
Launching in early September 2026, NASA's Nancy Grace Roman Space Telescope will conduct the Galactic Bulge Time Domain Survey to detect and characterize about 100 isolated neutron stars, objects invisible to current methods. Using a unique dual approach combining photometric and astrometric microlensing, Roman will precisely measure the mass and motion of these hidden stars, breaking previous observational limits. This will resolve key mysteries like the neutron star-black hole mass gap and natal kick velocities, refining models of stellar evolution and supernova explosions. Additionally, Roman's census of roughly 2,500 compact objects will improve our understanding of the Milky Way's structure and enhance gravitational wave predictions for future missions.