ALMA Fellow Report: ALMA Study of Disk Formation around Protostars - PowerPoint PPT Presentation

ALMA Fellow Report: ALMA Study of Disk Formation around Protostars Shigehisa Takakuwa & Nicolas Salinas (Kagoshima University)

Introduction 1. Evidence for Magnetic Fields in Disk Formation ? ̶> Counter Rotation between the Envelopes and Disk in IRAS 04169+2702. How the precursors of planets, protoplanetary disks, form ? ̶> Still Controversial. ̶> ALMA Observations of Protostellar Envelopes and the Forming Disks around Protostars. 2. Sign of Planet Formation in Protostellar Disks ? ̶> Our follow-up HL Tau observations.

Class I Protostar IRAS 04169+2702 Tbol ~133 K; Lbol ~0.76 Lsolar; in the B213 Cloud SE (Blue) NW (Red) in C 18 O (1-0) 2200×1100 au Envelope Ohashi et al. (1997) Envelope Velocity Gradient 5.6 6.0 6.3 2000 AU 6.7 7.0 7.4 DECLINATION (B1950) 7.7 8.0 27 03 15 00 02 45 30 15 04 16 56 55 54 53 52 RIGHT ASCENSION (B1950)

SMA Velocity Features a) 13 CO (3-2) Blue & Red b) SO (6 5 -5 4 ) Blue & Red c) C 18 O (2-1) Low-Vel. Blue & Red d) 70 au 280 au Right ascension (J2000.0)

Disk and Envelope Rotation Our Results of IRAS 04169+2702 Opposite. See Takakuwa et al. 2018, ApJ, 865, 51 ~1000 au Redshifted Outflow ( 12 CO 2-1; 1-0; 13 CO 2-1) SO 6 5 -5 4 ~200 au Blueshifted Outflow Disk ( 12 CO 2-1; 1-0) ( 13 CO 3-2) Infalling and Counter-Rotating Envelope (C 18 O 1-0, 2-1)

Cycle 6 ALMA Observations of IRAS 04169 ̶> C43-5 Executed !! The Gas motion controlled by the magnetic field will be unveiled unambiguously with ALMA. Anticipated Model Velocity Channel maps in C 18 O 3-2 280 au beam Right ascension (J2000.0)

ALMA SV observations of HL Tau Resolution: 80 mas (11 au) 30 mas (4 au) 30 mas (4 au) Akiyama et al. 2016 Pinte et al. 2015

Hints of HCO + gas gaps D1 B1 D2 B2 D5 B5 D6 B6 (a) (b) (c) original moment 0 map of HCO + (1-0) Outer Gap Inner Gap Azimuthal Image Averaging Reconstruction D2 D5 B5 D6 B6 Yen et al. 2016

Hints of HCO + gas gaps D1 B1 D2 B2 D5 B5 D6 B6 (a) (b) (c) original moment 0 map of HCO + (1-0) Outer Gap Inner Gap Azimuthal Image Averaging Reconstruction D2 D5 B5 D6 B6 (a) (b) HCO + (4-3) HCO + (3-2) HCO + (1-0) HCO + (3-2) HCO + (4-3) Prediction Yen et al. 2016

Summary: ALMA Study of Disk Formation around Protostars Gas Motion controlled by the Magnetic Field in the Process of Disk Formation. Search for Sign of Planet Formation in the Disks around Protostars.

New Hiring Unfortunately, Nicolas left Kagoshima for his personal issue. We are going to hire another one.