Speaker
Description
Forbidden lines of atomic oxygen at 6300 and 5577 Angstroms and rovibrational lines of CO near 4.7 microns are relatively strong and well-observed in T Tauri stars. The oxygen lines have been touted as the ``smoking gun" of photoevaporative winds, but after considering the requirements for their excitation, we conclude that they are at least as likely to form in magnetothermal winds such as those modeled recently by Wang and collaborators. The CO line profiles are more often single- rather than double-peaked, with rotational temperatures of 300-1000 K, and are probably excited by IR or UV pumping rather than collisions. These lines are difficult to explain by photoevaporative winds, and are more naturally produced by magnetothermal ones.
