Astronomy Colloquium (2018 Fall Semester)

* DateFeb. 7* SpeakerDr. Chin-Fei Lee (ASIAA)* TitleHungry Baby Star Eating A Space Hamburger and Spitting Spinning Bullets* Abstract 

With unprecedented angular resolution of 0.02″ of ALMA, we have resolved the disk and jet system in the young protostellar system HH 212 in Orion.  The disk is resolved for the first time in the vertical direction, showing a dark lane sandwiched between two bright features, appearing as a hamburger.

The disk is flared as expected for an accretion disk.  A highly collimated jet is also detected ejecting from the disk, consisting of a train of fast-moving bullets.  It is resolved, showing a rotation across the jet axis.  Thus, our ALMA observations show that a hungry baby star is spitting a chain of spinning bullets when eating a space hamburger.  I will also report the detection of prebiotic complex organic molecules in the disk atmosphere and discuss their possible formation on icy grains.

** Host : Prof. Woong-Tae Kim