Tt,mTt,e=(EmEe)1/4(MmMe)1/6

with Tt,e=34K and TCO2(gas|p=0.1atm)>180K

For Mm=Me and Tt,m=180K we get Ecrit780E

Assuming EM, then Mcrit5×108M

Ecrit=5×1030erg/sE=4×1020erg/s