ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A Hot Corino
  Survey toward Protostellar Cores in the Orion Cloud
  The presence of complex organic molecules (COMs) in the interstellar medium
(ISM) is of great interest since it may link to the origin and prevalence of
life in the universe. Aiming to investigate the occurrence of COMs and their
possible origins, we conducted a chemical census toward a sample of
protostellar cores as part of the ALMA Survey of Orion Planck Galactic Cold
Clumps (ALMASOP) project. We report the detection of 11 hot corino sources,
which exhibit compact emissions from warm and abundant COMs, among 56 Class 0/I
protostellar cores. All the hot corino sources discovered are likely Class 0
and their sizes of the warm region ($>$ 100 K) are comparable to 100 au. The
luminosity of the hot corino sources exhibits positive correlations with the
total number of methanol and the extent of its emissions. Such correlations are
consistent with the thermal desorption picture for the presence of hot corino
and suggest that the lower luminosity (Class 0) sources likely have a smaller
region with COMs emissions. With the same sample selection method and detection
criteria being applied, the detection rates of the warm methanol in the Orion
cloud (15/37) and the Perseus cloud (28/50) are statistically similar when the
cloud distances and the limited sample size are considered. Observing the same
set of COM transitions will bring a more informative comparison between the
cloud properties.
