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We use VLTI/GRAVITY near-infrared interferometry measurements of 8 bright,Type 1 AGN to study the size and structure of hot dust heated by the centralengine. We partially resolve each source, and report Gaussian FWHM sizes in therange 0.3-0.8 milliarcseconds. In all but one object, we find no evidence forsignificant elongation or asymmetry (closure phases < 1 deg). The effectivephysical radius increases with bolometric luminosity as found from pastreverberation and interferometry measurements. The measured sizes for Seyfertgalaxies are systematically larger than for the two quasars in our sample whenmeasured relative to the previously reported R ~ L^1/2 relationship explainedby emission at the sublimation radius. This could be evidence of evolvingnear-infrared emission region structure as a function of central luminosity.

The resolved size and structure of hot dust in the immediate vicinity of AGN