Hector Javier Durand-Manterola is the author with the yahoo address. It looks like he did work at Universidad Nacional Autónoma de México (UNAM), where the other two authors are from, at one point [1]. He's authored a few other astronomy papers at arxiv [2] even though he doesn't seem to be in the database. Perhaps he has retired from academic life.
It is written in comic sans and one of the authors is using a yahoo mail. Maybe I'm just being an elitist nerd, but really...