# How do neutron stars emit black body radiation?

If my understanding is correct, black body radiation is emitted by a substance due to the substances coupling with the electric field. The negatively charged electrons in atoms for example can couple with the electromagnetic field to turn thermal vibrational energy into black body radiation, hence ordinary baryonic matter can radiate black body radiation. A neutron, however, has no such charge, so it cannot couple to the electromagnetic field in this way. A neutron does have a magnetic moment which might be able to allow for some interaction with an EM field but perhaps not in the same way. Regardless, I want to know how a neutron star (an object that I will assume for the sake of the question to be made purely of neutrons) can emit black body radiation? If it does, does its spectrum resemble that of a normal blackbody?

• Maybe the question needs some clarification. An atom can be electrically neutral overall, but a substances made of neutral atoms can still radiate like a blackbody. Similarly, a neutron is electrically neutral overall, but it's made of electrically-charged constituents (quarks), just like an atom is made of electrically-charged constituents, and the same is true for a neutron star. Are you asking if blackbody radiation depends on the scale at which the charged constituents are bound, or something like that? Dec 9, 2020 at 1:59