Tidal disruption events and quasi-periodic eruptions

Tidal disruption events (TDEs) occur when a star passes close to a massive black hole so that the tidal forces of the black hole exceed the binding energy of a star and cause it to be ripped apart. Part of the matter will fall onto the black hole, causing a strong increase in luminosity. Such events are often seen in the optical or the x-ray (or both) or even at other wavelengths such as in the radio, where the diversity of observed emission is still poorly understood. The XMM-Newton catalog of approximately a million x-ray detections covering 1283(2) degrees of sky contains a number of these events. Here I will show the diverse nature of a number of TDEs discovered in the catalog and discuss their relationship with quasi-periodic eruptions.