Oral Presentation

Radio observations on the planet-forming disk PDS70

Author(s): Hauyu Baobab Liu (Department of Physics, National Sun Yat-sen University)

Presenter: Hauyu Baobab Liu (NSYSU)

We have performed the JVLA Q (40-48 GHz), Ka (29-37 GHz), K (18-26 GHz), and X (8-12 GHz) bands observations towards the PDS70 disk that is known to barbor two accreting gas giants, PDS70b and PDS70c. We found that the Q band flux density is dominated by a dust crescent in the northwest that the maximum grain size is 1 mm, while the flux densities at lower frequencies might be contributed by spinning nanometer-sized dust. Free-free emission may not be negligible, although we presently can only infer an upper limit from the X band non-detection. I will discuss the implication to the ALMA Band 1 observations on protoplanetary disks in general.