Adrian Price-Whelan

Ah, interesting. So it's the confluence of new .cls file + old .bst file? I still occasionally print out a paper - forgive me for I have sinned!

Thanks @augustfly!

Yea, we're using `modern` so I'm not sure why `emulateapj` would be causing issues. Example:  compare to align: 

Sorry for the long delay -- I've been on paternity leave. Did you both ever resolve this issue? One question for you: if you have an M2 chip, you should...

I just released new versions of twobody and thejoker that should hopefully resolve this issue -- sorry again for the delay!

(Please reopen this if you still run into the error)