Constraints on the Mass and Radius of the Neutron Star XTE J1807-294

Understand

The accreting millisecond pulsar XTE J1807-294 is studied through a pulse shape modeling analysis.

• The model includes blackbody and Comptonized emission from the one visible hot spot and makes use of the Oblate Schwarzschild approximation for ray-tracing.
• We include a scattered light contribution, which accounts for flux scattered off an equatorial accretion disk to the observer including time delays in the scattered light.
• We give limits to mass and radius for XTE J1807-294 and compare to limits determined for SAX J1808-3658 and XTE J1814-334 previously determined using similar methods.