Millimeter-sized Dust Grains Surviving the Water-sublimating Temperature in the Inner 10 au of the FU Ori Disk

  title={Millimeter-sized Dust Grains Surviving the Water-sublimating Temperature in the Inner 10 au of the FU Ori Disk},
  author={Hauyu Baobab Liu and An-Li Tsai and Wen Ping Chen and Jin Zhong Liu and Xuan Zhang and Shuo Ma and Vardan G. Elbakyan and Joel D. Green and Antonio S. Hales and Sheng-Yuan Liu and Michihiro Takami and Sebasti'an P'erez and Eduard I. Vorobyov and Yao-Lun Yang},
  journal={The Astrophysical Journal},
Previous observations have shown that the ≲10 au, ≳400 K hot inner disk of the archetypal accretion outburst young stellar object, FU Ori, is dominated by viscous heating. To constrain dust properties in this region, we have performed radio observations toward this disk using the Karl G. Jansky Very Large Array in 2020 June–July, September, and November. We also performed complementary optical photometric monitoring observations. We found that the dust thermal emission from the hot inner disk… 


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