Datensatz

Zusammenfassung

Spider pulsars continue to provide promising candidates for neutron star mass
measurements. Here we present the discovery of PSR~J1910$-$5320, a new
millisecond pulsar discovered in a MeerKAT observation of an unidentified
\textit{Fermi}-LAT gamma-ray source. This pulsar is coincident with a recently
identified candidate redback binary, independently discovered through its
periodic optical flux and radial velocity. New multi-color optical light curves
obtained with ULTRACAM/NTT in combination with MeerKAT timing and updated
SOAR/Goodman spectroscopic radial velocity measurements allow a mass constraint
for PSR~J1910$-$5320. \texttt{Icarus} optical light curve modelling, with
streamlined radial velocity fitting, constrains the orbital inclination and
companion velocity, unlocking the binary mass function given the precise radio
ephemeris. Our modelling aims to unite the photometric and spectroscopic
measurements available by fitting each simultaneously to the same underlying
physical model, ensuring self-consistency. This targets centre-of-light radial
velocity corrections necessitated by the irradiation endemic to spider systems.
Depending on the gravity darkening prescription used, we find a moderate
neutron star mass of either $1.6\pm0.2$ or $1.4\pm0.2$ $M_\odot$. The companion
mass of either $0.45\pm0.04$ or $0.43^{+0.04}_{-0.03}$ $M_\odot$ also further
confirms PSR~J1910$-$5320 as an irradiated redback spider pulsar.radiated
redback spider pulsar.