"The observations suggest the cloud was stretched out to something like three times the size of the star. However, the infrared brightening Spitzer saw suggests that only a little bit of the cloud passed in front of the parent star. The rest of the cloud, unseen by the telescope, might have been hundreds of times larger than HD 166191."
I dug a bit more into HD 166191. The NASA ADS Abstract, A Star-sized Impact-produced Dust Clump in the Terrestrial Zone of the HD 166191 System,
https://ui.adsabs.harvard.edu/abs/2022ApJ...927..135S/abstract, March 2022.
My note. The discussion part of the paper is cautious about the asteroid collision interpretation presented. “4. Discussion The year-long, large infrared brightening seen in the warm Spitzer data, the detection of the deep dips in both the optical and infrared during the rapid phase of the infrared flux increase, combined with the fast evolution of the dips, all suggest that we are witnessing a large asteroid collision in the terrestrial zone of the HD 166191 system. Although we think the asteroid collision scenario best describes what is observed in HD 166191, it is necessary to point out that the deep dips might be caused by other independent means that are not related to the infrared brightening. For example, gas-related clumping and hydrodynamic instabilities in a gas-rich protoplanetary disk could produce irregular sharp dips (Bouvier et al. 2003; Dullemond et al. 2003; Bredall et al. 2020) and would not be related to the brightening in the system's infrared output. However, the lack of abundant gas argues against such mechanisms operating in the HD 166191 system. Here, we only focus on the asteroid collision hypothesis and discuss its implications.”
My note. This report does show a dust mass estimate presented. “From equation (5) of Rhee et al. (2008), the minimum dust mass for the hot dust component (τ ∼6%) is 5 × 10^20 to 6 × 10^23 g for the same range of orbital radii and grain sizes mentioned in section 4.2, equivalent to the mass of a R = 40 to 400 km, 2.5 g cm^−3 rocky body.”,
https://arxiv.org/pdf/1308.0405.pdf, 06-Sep-2013, The nearby, young, isolated, dusty star HD 166191.
That is not much dust disk mass reported. That is about 1E-4 or 10^-4 earth masses. This is close to 0.01 Moon mass. In comparison, applying the MMSN to 1.6 Msun host star, the disk mass could be 5.327084E+03 or 5327 earth masses, assuming it existed.
Reference paper, A Star-sized Impact-produced Dust Clump in the Terrestrial Zone of the HD 166191 System,
https://iopscience.iop.org/article/10.3847/1538-4357/ac4bbb, 10-March-2022. My note. Table 1 shows the star rotates 27 km/s. With 1.6 Msun and 2.0 Rsun, mean density ~ 2.8168E-01 g cm^-3 or 0.28168 g cm^-3. I did not find the disk mass estimate provided.
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