Can you trap the souls of monsters you have summoned into a soul gem in Skyrim?

I have been trying to get a soul in my gem and I was wondering if I can summon something and then capture that's soul.

Is it possible?

No, none of your summoned creatures can be soul-trapped. They probably changed that from the earlier games as it made farming souls far too easy.

No I don't think you can, I just tried to trap a created Flame Atronach and a Familiar both came up with the message that they resisted the soul trap. They both also started to attack me when I attacked them. I use a weapon with a 2 second soul trap enchantment in it rather than a soul trap spell I find it's a lot easier to trap souls that way. It maybe because you have summoned something that is not strictly alive and therefore has no soul.

You can soul trap summoned Ash Guardians (conjured without a heart stone) from the Dragonborn DLC. They fill greater soul gems.