An international team of astronomers has utilized the Zwicky Transient Facility (ZTF) and the Transiting Exoplanet Survey Satellite (TESS) to investigate a binary system designated ZTF J0007+4804. As a result, they have found that ZTF J0007+4804 is the first hot subdwarf-white dwarf system discovere d that produces dwarf nova outbursts. The finding is reported in a paper published May 4 on the arXiv preprint server. ...read more read less