Massive compact dust disk with a gap around CW Tau revealed by ALMA multi-band observations

Ueda, Takahiro; Kataoka, Akimasa; Tsukagoshi, Takashi

doi:10.48550/arxiv.2203.16236

Cited by 2 publications

(2 citation statements)

References 63 publications

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“…At each position, the fittings generally lead to two families of probable solutions, one with a max 300 µm and a higher surface density (small dust solution), and the other with a max 1mm and lower surface density (large dust solution). Such a degeneracy in the SED fittings is also pointed out by the recent case studies on the CW Tau disk (Ueda et al 2022). We also draw the positions of the clumps in the images (dashed line).…”

Section: Dust Sizesupporting

confidence: 69%

Multiple Rings and Asymmetric Structures in the Disk of SR 21

Yang¹,

Liu²,

Muto³

et al. 2023

Preprint

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Crescent-like asymmetric dust structures discovered in protoplanetary disks indicate dust aggregations. Thus, the research on them helps us understand the planet formation process. Here we analyze the ALMA data of the protoplanetary disk around the T-Tauri star SR 21, which has asymmetric structures detected in previous sub-millimeter observations. Imaged at ALMA Band 6 (1.3 mm) with a spatial resolution of about 0. 04, the disk is found to consist of two rings and three asymmetric structures, with two of the asymmetric structures being in the same ring. Compared to the Band 6 image, the Band 3 (2.7 mm) image also shows the three asymmetric structures but with some clumps. The elongated asymmetric structures in the outer ring could be due to the interactions of a growing planet. By fitting the Band 3 and Band 6 dust continuum data, two branches of solutions of maximum dust size in the disk are suggested: one is larger than 1 mm, and the other is smaller than 300 µm. High-resolution continuum observations at longer wavelengths as well as polarization observations can help break the degeneracy. We also suggest that the prominent spiral previously identified in VLT/SPHERE observations to the south of the star at 0. 25 may be the scattered light counterpart of the Inner Arc, and the structure is a dust-trapping vortex in nature. The discovered features in SR 21 make it a good target for studying the evolution of asymmetric structures and planet formation.

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Section: Dust Sizesupporting

confidence: 69%

Multiple Rings and Asymmetric Structures in the Disk of SR 21

Yang¹,

Liu²,

Muto³

et al. 2023

Preprint

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“…Millimetric emissions partially or totally dominated by optically thick structures has been invoked to explain the sizeluminosity relationship found in 50 nearby PPDs (Tripathi et al 2017) as well as multi-band ALMA observations for a sample of 26 bright PPDs in the Lupus SFR (Tazzari et al 2021). Ueda et al (2022) found that in the case of CW Tau the disk mass can be underestimated due to opacity effects if the measurement is carried out from ALMA bands 6-8 (1.3-0.75 mm), highlighting again the importance of multi-band observations and a proper modeling of the dust opacity.…”

Section: Accretion and Disk Massmentioning

confidence: 95%

GIARPS High-resolution Observations of T Tauri stars (GHOsT)

Gangi¹,

Antoniucci²,

Biazzo³

2022

A&A

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Aims. In the framework of the GIARPS@TNG High-resolution Observations of T Tauri stars (GHOsT) project, we study the accretion properties of 37 Classical T Tauri Stars of the Taurus-Auriga star forming region (SFR) with the aim of characterizing their relation with the properties of the central star, of jets and disk winds, and of the global disk structure, in synergy with complementary ALMA millimiter observations. Methods. We derive stellar parameters, optical veiling, accretion luminosity (L acc ) and mass accretion rate ( Ṁacc ) in a homogeneous and self-consistent way using high-resolution spectra acquired at the Telescopio Nazionale Galileo with the HARPS-N and GIANO spectrographs, and flux-calibrated based on contemporaneous low-resolution spectroscopic and photometric ancillary observations. Results. The L acc -L , Ṁacc -M and Ṁacc -M disk relationships of the Taurus sample are provided and compared with those of the coeval SFRs of Lupus and Chamaeleon I. We analysed possible causes giving rise to the observed large spreads in the relationships. We find that: (i) a proper modeling in deriving the stellar properties in heavily spotted stars can reduce the spread of the Ṁacc -M relation, (ii) transitional disks tend to have lower Ṁacc at a given M , (iii) stars in multiple systems have higher Ṁacc at the same M disk , (iv) the Ṁacc vs the disk surface density has a smaller spread compared to that of the Ṁacc -M disk , indicating that opacity effects might be important in the derivation of M disk . Finally, the luminosities of the [O i] 630 nm narrow-low-velocity component (NLVC) and high-velocity component (HVC) and the de-projected HVC peak velocity were found to correlate with the accretion luminosity. We discuss such correlations in the framework of the currently accepted jets/winds models. Conclusions. Our results demonstrate the potential of contemporaneous optical and near-infrared high-resolution spectroscopy to simultaneously provide precise measurements of stellar and accretion/wind properties of young stars.

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Massive compact dust disk with a gap around CW Tau revealed by ALMA multi-band observations

Cited by 2 publications

References 63 publications

Multiple Rings and Asymmetric Structures in the Disk of SR 21

Multiple Rings and Asymmetric Structures in the Disk of SR 21

GIARPS High-resolution Observations of T Tauri stars (GHOsT)

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