  We study high energy neutrino emission from relativistic jets launched by a
black hole (BH) spiraling-in inside the envelope of a red supergiant (RSG), and
find that such common envelope jets supernovae (CEJSNe) are a potential source
for the ~10^15 eV neutrinos detected by IceCube. We first use the stellar
evolution code MESA to mimic the effect of the jets on the RSG envelope, and
find that the jets substantially inflate the envelope. We then study the
propagation of jets inside the extended RSG envelope and find that in most
cases the jets do not penetrate the envelope but are rather stalled. We show
that such jets can accelerate cosmic rays to high enough energies to produce
high energy neutrinos. While the neutrinos stream out freely, the gamma-rays
that accompany the neutrino production remain trapped inside the optically
thick envelope. This explains the lack of observational association between
high energy neutrinos and gamma-rays.
