PTF1 J082340.04+081936.5: A hot subdwarf B star with a low mass white dwarf companion in an 87 minute orbit

Thomas Kupfer, Jan van Roestel, Jared Brooks +19

We present the discovery of the hot subdwarf B star (sdB) binary PTF1 J082340.04+081936.5. The system has an orbital period P${}_{\mathrm{orb}}=87.49668(1)$ min (0.060761584(10) days), ma…