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Observations of Circumstellar Disks around YSOs Nagayoshi Ohashi, ASIAA Kyoto Univ. 09.11.2009 Outline of Talk Brief introduction of the SMA Project Star formation and disk formation/evolution Overview Disks around PMSs; HD 142527 Disks around protostars; B335 LAB, France 07.01.2009 2 SMA Project Joint project of the SAO and ASIAA. SMA consists of eight 6-m telescopes operating at submm wavelengths (1mm to 350 mm) at the top of Mauna Kea. ASIAA joined the project in 1996. ASIAA has delivered two telescopes with receiver systems. Currently 230, 345, and 690 GHz bands are under regular operation. The SMA was dedicated in November 2003. The SMA is the fore-runner to ALMA. Kyoto Univ. 09.11.2009 3 Science using SMA Star formation Jet/outflow Circumstellar disks Magnetic field Extragalactic Nearby galaxies/AGN High-z galaxies Evolved stars Astrochemistry Solar system Syfert/AGN Magnetic field LAB, France 07.01.2009 Outflow Solar system 4 Star and Planet Formation: Optically invisible! Overview A low-mass star (protostar) is formed in a dense molecular cloud core through its gravitational collapse. The dense cloud becomes flatted (along the associated magnetic field). The associated magnetic field is also dragged inward. A circumstellar disk is also formed around a YSO. A molecular outflow takes place at some point. Infall is terminated and a dense core is dispersed. The central star becomes optically visible (T Tauri star). Planets are formed in the circumstellar disk? Takakuwa et al. 2003 Girart et al. 2006 Lada et al. 2003, Alves et al. 2001 Dense molecular cloud LAB, France 07.01.2009 5 Research on Protostellar Disks and Protoplanetary Disks Formation of protostellar/protoplanetary disks; early phase (class 0 or even younger protostars) Evolution of PSD/PPD; intermediate phase (class I and II) Dissipation of PPD/Planet formation; late phase (class II and III) Disks around massive stars and brown dwarfs. LAB, France 07.01.2009 6 HH211 SiO 8–7 at 0.2” (60 AU) resolution Lee et al. ApJ in press A possible velocity gradient across the innermost pair of knots ~0.5 km /s at ~10 AU LAB, France 07.01.2009 7 Dust Polarization & Magnetic Field NGC1333/IRAS4A 345 GHz Total Intensity and Linear Polarization (B field) Crutcher (2006), Girart et al. 2006 LAB, France 07.01.2009 Science, 313, 771 8 Protoplanetary Disk: the site of planet formation Protoplanetary disks (PPDs) are most probable sites for planet formation. Important to understand their physical conditions. Common characteristics or more variety? More than 150 extra-solar planets have been discovered. More systems with hot Jupiters and high eccentricity. LAB, France 07.01.2009 9 MM High Resolution Images of PPDs GM Aur (Dutrey et al. 1998) 1.3 mm cont 0.6” x 0.7” (~80 AU x 100 AU) Geometry: compact, disklike structures Kinematics: Kepler motions LAB, France 07.01.2009 10 Protoplanetary disks with spiral arms AB Aur @ 1.6 micron HD 142527 @ 1.6 micron Fukagawa et al. 2004 Fukagawa et al. 2006 LAB, France 07.01.2009 11 HD 142527 Herbig Ae star (F6 IIIe; M* ~ 2Mo) Subaru observations revealed that the disk has a spiral arm (Fukagawa et al. 2006) Subaru observations at MIR revealed a hole in the disk (Fujiwara et al. 2006). ASTE observations suggested existence of a gas disk. There was no mm interferometric observations due to its low declination. LAB, France 07.01.2009 12 HD142527: Subaru Infrared Images 1.6 mm CIAO image 24.5 mm COMICS image (Fukagawa et al. ‘06) (Fujiwara et al. ‘06) LAB, France 07.01.2009 13 SMA Observations of HD142527 12CO 3-2 and 340 GHz continuum simultaneous observations One track with the compact configuration One track with the extended configuration 1.2” x 0.6” for dust continuum 2.1” x 1.1” for 12CO 3-2 Ohashi & Momose (‘09, submitted) SMA is a joint project between the SAO and the ASIAA. LAB, France 07.01.2009 14 SMA Results: 340 GHz Continuum HD 142527 340 GHz continuum distribution resembles to the 1.6 mm scattered emission. An arc-like structure enclosing the central star two peaks; one at the NE and the other at the NW. Peak positions are shifted to the N as compared to those seen at 1.6 mm. No clear emission on the southern side. Total flux density ~1.2 Jy LAB, France 07.01.2009 15 SMA 12 Result: CO 3-2 12CO also shows a central hole, with peak emissions coincident with the infrared features. LAB, France 07.01.2009 16 SMA Results: Spiral arms in gas? LAB, France 07.01.2009 17 12CO 3-2 Mean Velocity Clear velocity gradient from NW to SE, which is probably due to rotation. Additional velocity gradient suggestive of non-circular motion. LAB, France 07.01.2009 Roughly consistent with Kepler rotation around a 2Mo star. Disk axis is from NE to SW? Any relationship with gas possibly associated with the spiral arm? 18 12CO 3-2 Channel Maps LAB, France 07.01.2009 19 Is 12CO 3-2 emission optically thin? 12CO shows similar structures to the dust emission. Low brightness temperature (8.5 K). Chiang & Goldreich ‘97 12CO 3-2 emission may be optically thin. LAB, France 07.01.2009 21 HD142527: Disk Mass 345 GHz total flux ~ 1.2 Jy, corresponding to 4.1E-2 Mo Gas/dust mass ratio 100; Tdust = 50K 12CO 3-2 integrated flux ~ 15 Jy km/s, corresponding 6.6E-6 Mo. [H2]/[12CO] = 104; Tex = 50 K The disk mass derived from 12CO 3-2 is factor of 10000 smaller that that derived from 345 GHz dust. CO depletion factor ~10000? H2 dissipation factor ~10000? Combination of CO depletion and gas dissipation? LAB, France 07.01.2009 22 Unknown factors to estimate mass Dust temperature and CO excitation temperature b-index (mass opacity) Even if we assume Td=Tex=100 K, the mass difference is still more than three orders of magnitude. Even if we assume a smaller b-index, the mass derived from dust becomes just a factor of 2 smaller. CO depletion factor, f(co) Around TTSs, f(CO) has been estimated to be upto ~200. Since Td would be higher around Herbig Ae stars, f(CO) would be less than 200. Even if we take into account of these unknown factors, it still seems to be difficult to explain the mass difference of 4 orders of magnitude. LAB, France 07.01.2009 23 Gas dispersal in disk by photoevaporation Takeuchi et al. (‘05; see also Alexander & Armitage ‘07) studied disk clearing processes. using a model taking into account combined effects of viscous evolution, photoevaporation, differential radial motion of dust grains and gas. Around an Herbig Ae/Be star with more ionizing photon, a gas-poor dust ring will be formed in 106 yr. LAB, France 07.01.2009 24 Takeuchi et al. 2005 A gap is created at ~17 AU (rg) by photoevapolation Inside the gap Outside the gap LAB, France 07.01.2009 Both gas and dust accrete onto star due to viscosity. Gas is gradually evaporated from the inner edge, and the inner edge gets larger. Dust accumulates at the inner edge. 25 Protostellar Disks around Protostars Kyoto Univ 11.09.2009 26 L1551 IRS5: Infalling Envelope P-V diagrams C18O (1-0) with NMA (Momose et al. 1998) A2 B2 0.1 Mo 700AU km/s V 2GM r 1.59M 1M 1 Vrot 0.24 r 0.5 A1 B1 Mass ~0.08 M Radius ~ 1200 AU Kyoto Univ infall 0.5 r 700AU 0.5 km/s Freely infalling and slowly rotating with angular momentum conserved 11.09.2009 27 L1551 IRS5: Formation of a protostellar disk SMA CS 7-6 Total Intensity SMA CS7-6 mean velocity NMA C18O 1-0 Takakauwa, Ohashi + 2003 Kyoto Univ 11.09.2009 28 Specific Angular Momenta around YSOs Specific angular momentum seems to be constant within a radius of ~6000 AU. Ohashi et al. 1997 + new data (Yen, Takakuwa, Ohashi 2009) Kyoto Univ 11.09.2009 29 B335 (IRAS 19347+0727) Class 0 Protostar Lbol ~ 1.5 Lo, Tdust ~ 30 K Associated with a well developed outflow (e.g., Hirano et al. ‘88, ‘92) Infall signatures were observed (Zhou et al. ‘93; Choi et al. ’95; Saito et al. ‘99). Kyoto Univ 11.09.2009 30 SMA Observations of B335 12CO, 13CO, C18O 2-1 and 230 GHz continuum simultaneous observations One track with the compact configuration 3.9” x 3.3” for dust continuum 3.7” x 3.2” for C18O 2-1 (Yen, Takakuwa, Ohashi ‘09, submitted) SMA is a joint project between the SAO and the ASIAA. LAB, France 07.01.2009 31 B335: 1.3 mm continuum Kyoto Univ 11.09.2009 Size ~ 740 AU x 350 AU Mass ~ 0.027 Mo 32 B335: C18O 2-1 Kyoto Univ 11.09.2009 Size ~ 1500 AU Partially affected by the outflow. Mass ~ 5.2 x 10-3 Mo C18O depletion (fd ~10) 33 B335: 18 C O 2-1 kinematics Vinfall ~ 0.31-0.44 km/s @ 370 AU, Mstar ~ 0.02-0.04 Mo, Mass infall rate ~ 4.8-6.9 x 10-6 Mo/yr Kyoto Univ 11.09.2009 34 B335: 18 C O 2-1 Kinematics (II) No detectable velocity gradient along the N-S direction; Vrot < 0.04 km/s @ 370 AU Kyoto Univ 11.09.2009 35 Specific Angular Momentum in B335 4.6 x 10-3 km/s pc @ 20000 AU 5.4 x 10-4 km/s pc @ 1000 AU (Saito et al.’99) 7 x 10-5 km/s pc @ 370 AU (SMA results) The specific angular momentum is not conserved outside R ~ 370 AU. If the specific angular momentum is conserved within R ~370 AU, Rd ~ 6 AU Kyoto Univ 11.09.2009 36 With ALMA? Observations with spatially high dynamic range (10-10000 AU scale) Observations with high sensitivity and resolution Kepler disk formation; age estimation based on the disk size? Pick up the earliest phase of the disk formation. Signature of the planet formation/disk dissipation. Observations with a large sample. Kyoto Univ 11.09.2009 37