The OmegaWhite survey for short-period variable stars - V. Discovery of an ultracompact hot subdwarf binary with a compact companion in a 44 minute orbit

T. Kupfer, G. Ramsay, J. van Roestel +20

We report the discovery of the ultracompact hot subdwarf (sdOB) binary OW J074106.0-294811.0 with an orbital period of P${}_{\mathrm{orb}}=44.66279\pm 1.16\times 10^{-4}$ min, making it the…