So, without giving out the details about the school. I joined a graduate program at school X, because I was really interested in work of professor Y. I met him during the graduate school visit and I accepted the offer to join school X.
Though Prof. Y did not officially accept me as his graduate student, he said come and meet me when school starts and we can figure out your research direction. Now, when I came to start at this school; I found out the professor Y has left and joined a different school Z.
I don't know what do now. My decision of joining school X was based on my intentions to work with Prof Y. Also, on top of that the school X now just has one faculty working in my interested area.
To be precise I am starting the PhD program now (Fall , 1st sem). I am not sure what my next step should be? I would appreciate any suggestions on the given situation.