PROTOSTAR L1455 IRS1: A ROTATING DISK CONNECTING TO A FILAMENTARY NETWORK

ABSTRACT We conducted IRAM-30 m C18O (2-1) and SMA 1.3 mm continuum 12CO (2-1) and C18O (2-1) observations toward the Class 0/I protostar L1455 IRS1 in Perseus. The IRAM-30 m C18O results show IRS1 in a dense 0.05 pc core with a mass of 0.54 M , connecting to a filamentary structure. Inside the dense core, compact components of 350 au and 1500 au are detected in the SMA 1.3 mm continuum and C18O, with a velocity gradient in the latter one perpendicular to a bipolar outflow in 12CO, likely tracing a rotational motion. We measure a rotational velocity profile that becomes shallower at a turning radius of ∼200 au, which is approximately the radius of the 1.3 mm continuum component. These results hint at the presence of a Keplerian disk with a radius