star-forming galaxies. We measure the Sérsic index for the host of AT2019qiz by fitting the light distribution in the PanSTARRS $r$-band image using <span style="font-variant:small-caps;">galfit</span> [@peng2002]. The residuals are shown in Figure \[fig:galfit\]. We do not fit for the spiral structure. Following @French2020, we investigate the effect of including an additional central point source (using the point-spread function derived from stars in the image as in section \[sec:ground\]). The residuals appear flatter when including the point source (reduced $\chi^2 = 1.36$ with the point source or 1.46 without)[^9]. The best-fit Sérsic index is 5.2 (with the point source) or 6.3 (without). In either case, this is consistent with the upper end of the observed distribution for TDE hosts.

![Left: PanSTARRS $g$-band image of the host galaxy. We fit a Sérsic function for the overall surface brightness profile using <span style="font-variant:small-caps;">galfit</span>, but make no attempt to model the spiral arms. The model also includes a point source for the nearby star to the west (this star is fitted, but not subtracted when producing the residual images), and optionally a central point source for the galactic nucleus. Middle: Subtraction residuals without a central point source. Right: Subtraction residuals when including a central 