Oral title: ALMA Observations of Gas and Dust in the Protoplanetary Disk around TW Hya

Oral abstract: We report our ALMA band 7 observations of dust continuum emission and CO isotopologue lines from the 
protoplanetary disk around TW Hya. The result shows a significant decrement in CO gas throughout the disk even inside the CO 
snowline. The gap observed in dust continuum could be caused by gravitational interaction between the disk gas and a planet or 
could be the result of the sintering of CO ice.