Abstract
Tidal disruption events (TDEs) occur when a star, passing too close to a
massive black hole, is ripped apart by tidal forces. A less dramatic event
occurs if the star orbits just outside the tidal radius, resulting in a mild
stripping of mass. Thus, if a star orbits a central black hole on one of these
bound eccentric orbits, weaker outbursts will occur recurring every orbital
period. Thanks to five Swift observations, we observed a recent flare from the
close by (92 Mpc) galaxy IC 3599, where a possible TDE was already observed in
December 1990 during the Rosat All-Sky Survey. By light curve modeling and
spectral fitting, we account for all these events as the non-disruptive tidal
stripping of a single star into a 9.5 yr highly eccentric bound orbit. This is
the first example of periodic partial tidal disruptions, possibly spoon-feeding
the central black hole.
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