A photoionized accretion disk around a young high-mass star
  We present high spatial resolution ($52$ au) observations of the high-mass
young stellar object (HMYSO) G345.4938+01.4677 made using the Atacama Large
Millimeter/sub-millimeter Array (ALMA). This O-type HMYSO is located at 2.38
kpc and it is associated with a luminosity of $1.5\times10^5 L_\odot$. We
detect circumstellar emission from the H$38\beta$ hydrogen recombination line
showing a compact structure rotating perpendicularly to the previously detected
radio jet. We interpret this emission as tracing a photo-ionized accretion disk
around the HMYSO. While this disk-like structure seems currently too small to
sustain continued accretion, the data present direct observational evidence of
how disks can effectively survive the photo-ionization feedback from young
high-mass stars. We also report the detection of a low-mass young stellar
object in the vicinity of the HMYSO and suggest that it forms a high-mass and
low-mass star binary system.
