NICER observation list: Target ID 252901
- Proposal Number = 2529
- Target ID = 252901
- Target Name = NUSTAR_J092418-3142.2
- Proposal Title = IS THE BRIGHTEST SERENDIPITOUS NUSTAR SOURCE AN UCXB AND AMXP?
- PI = JOHN TOMSICK
- Proposal Category = X-RAY PULSARS AND NEUTRON STARS
- Cycle number = 2
- Observation Type = NOR
NuSTAR J092418-3142.2 (J0924) is the brightest 3-24 keV source found in the NuSTAR serendipitous survey. Although its classification is unclear, it is a strong candidate for being an ultracompact X-ray binary (typically, a neutron star accreting from a white dwarf) based on the lack of hydrogen lines in its optical spectrum and its low optical to X-ray luminosity ratio. UCXBs are of great interest since they are strong gravitational wave sources due to their short orbital periods and also because they provide an opportunity to understand the effects of elemental abundances on accretion. Here, we propose for NICER observations to do a sensitive search for pulsations from J0924, which will also provide a determination of the orbital period for this potentially very compact binary.