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We explore the galaxy structure of four tidal disruption event (TDE) hostgalaxies on 30 pc to kpc scales using HST WFC3 multi-band imaging. The starformation histories of these hosts are diverse, including one post-starburstgalaxy (ASASSN-14li), two hosts with recent weak starbursts (ASASSN-14ae andiPTF15af), and one early type (PTF09ge). Compared to early type galaxies ofsimilar stellar masses, the TDE hosts have higher central surface brightnessesand stellar mass surface densities on 30-100 pc scales. The TDE hosts do notshow the large, kpc-scale tidal disruptions seen in some post-starburstgalaxies; the hosts have low morphological asymmetries similar to those ofearly type galaxies. The lack of strong asymmetries are inconsistent with arecent major (~1:1 mass) merger, although minor ($\lesssim$1:3) mergers arepossible. Given the time elapsed since the end of the starbursts in the threepost-burst TDE hosts and the constraints on the merger mass ratios, it isunlikely that a bound supermassive black hole binary (SMBHB) has had time tocoalesce. The TDE hosts have low central (<140 pc) ellipticities compared toearly type galaxies. The low central ellipticities disfavor a strong radialanisotropy as the cause for the enhanced TDE rate, although we cannot rule outeccentric disks at the scale of the black hole gravitational radius ofinfluence (~1 pc). These observations suggest that the high central stellardensities are a more important driver than SMBHBs or radial anisotropies inincreasing the TDE rate in galaxies with recent starbursts.

The Structure of Tidal Disruption Event Host Galaxies on Scales of Tens to Thousands of Parsecs