def mi09_Enuc(MFe, MNi, MSi, MCO):
    """Energy released via nuclear burning from Maeda & Iwamoto 2009
    
    Input a composition, with masses of elements in solar masses:
        MFe:  mass of stable Fe-peak elements like Cr, Ti, Fe, Co, Ni
        MNi:  mass of 56Ni
        MSi:  mass of intermediate-mass elements like Si, S, Mg, Ca
        MCO:  mass of unburned C + O
    Output energy released via nuclear burning in erg.
    """
    return 1e+51*(1.74*MFe + 1.56*MNi + 1.24*MSi)