[P-PS06] Planetary Sciences

[PPS06-21] Interpretations of the multiwavelength (sub)millimeter observations of PDS 70 c

*Yuhito Shibaike^1,2, Takahiro Ueda³ (1.Kagoshima University, 2.National Astronomical Observatory of Japan, 3.Harvard-Smithsonian, Center for Astrophysics)

Keywords:Forming Planet, ALMA, PDS 70 c, Circumplanetary disk

The young T Tauri star PDS 70 has two gas accreting planets sharing one large gap in a pre-transitional disk. Submillimeter continuum emission from one of the planets, PDS 70 c, has been detected by Atacama Large Millimeter/submillimeter Array (ALMA) at Band 7, interpreted as the thermal emission of dust in the circumplanetary disk (CPD). Recently, detections of the emission at Bands 3 and 4 have also been reported, but it has not detected at Band 9. The spectral indexes of Bands 3, 4, and 7 are about 2, suggesting an optically thick disk, which is inconsistent with our previous prediction that the CPD is optically thin due to a significant dust drift in the disk. The non-detection at Band 9 also suggests that the CPD is colder than our previous prediction. Additionally, it has been reported that the flux density of the emission at Band 7 has time variation. In this talk, I will discuss the possible interpretations of this strange but exciting observation results.