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We use deep imaging from the Dark Energy Camera to explore the peripheralregions of nine globular clusters in the outer halo of the Milky Way. Apartfrom Whiting 1 and NGC 7492, which are projected against the Sagittariusstream, we see no evidence for adjacent stellar populations to indicate any ofthese clusters is associated with coherent tidal debris from a destroyed hostdwarf. We also find no evidence for tidal tails around any of the clusters inour sample; however, both NGC 1904 and 6981 appear to possess outer envelopes.Motivated by a slew of recent Gaia-based discoveries, we compile a sample ofclusters with robust detections of extra-tidal structure, and search forcorrelations with orbital properties. While we observe that clusters with tidaltails are typically on moderately or very eccentric orbits that are highlyinclined to the Galactic plane and often retrograde, these are neithernecessary nor sufficient conditions for the formation of extra-tidal structure.That many objects with tidal tails appear to be accreted leads us to speculatethat this lack of consistency may stem from the inhomogeneous dynamical historyof the Milky Way globular cluster system. Finally, we note that clusters withprominent stellar envelopes detected in ground-based imaging (such as NGC 1851and 7089) are now all known from Gaia to possess long tidal tails --experimental confirmation that the presence of an extended envelope isindicative of tidal erosion.

A search for stellar structures around nine outer halo globular clusters in the Milky Way