CMU Physics w/ Astrophysics emphasis input

My son will be visiting CMU from the West Coast this Friday because of a hacking competition that his school did quite well in. In addition to the regular campus tour and meetings with people in computer science, he plans to contact the Physics Department and/or McWilliams Center for Cosmology for a tour if possible, since that’s actually the major that interests him most. He wants to know about opportunities for undergrad research in astrophysics and how double majors physics+CS work in practice.

I suggested that he contact the department secretary and CC some faculty on the email. Any input on who he should contact and what he should try to see?