Study of radial and vertical structure of the edge-on protoplanetary disk surrounding SSTtau042021

Coralie, Foucher

doi:10.5281/zenodo.17108786

Study of radial and vertical structure of the edge-on protoplanetary disk surrounding SSTtau042021

Coralie, Foucher

Publisher: Zenodo
DOI: 10.5281/zenodo.17108786
Repository: zenodo.org
Language: en

Abstract

Understanding the complexity of gas and dust structures in planet-forming disks is essential for a comprehensive view of planetary formation. We present an analysis of the nearly edge- on protoplanetary disk around SSTTau 042021 (inclination 90.6 ± 0.4deg), based on archival ALMA data. Edge-on disks like SSTTau 042021 are valuable laboratories for directly observing molecular stratification, bypassing challenges in vertical structure analysis faced by inclined disks. Using the tomographic method of Dutrey et al., we reconstruct the 2D brightness temperature distribution Tb(r,z) for CO isotopologues (12CO, 13CO, and C18O). We investigate the disk molecular layer location and the dust disk properties. This method, performed on high-resolution data (∼0.3′′), allows for accurate measurements of CO temperatures. Our results show, in particular, a good agreement between the CO and dust temperatures (within 8-12 K ) near the mid-plane. This study highlights the power of high-resolution tomography for probing disk stratification and provides insights for refining model approximations of vertical temperature gradients in protoplanetary disks.

Full text

Study of radial and vertical structure of the edge-on protoplanetary disk surrounding SSTtau042021 C. Foucher1*, A. Dutrey1, S. Guilloteau1, V. Pietu2 et al. a ❖ALMA observations: 12CO (2-1) and (3-2), 13CO (2-1), C18O (2-1) lines and the continuum at 150, 230, 333 GHz from two ALMA archival projects. ❖NOEMA observations: HCO+ (3-2) - Located in the Taurus cloud - The TTauri star is surrounded by a class II edge-on disk - Stellar mass of 0.29 M⊙ - ALMA also reveals a large CO disk (∼700 au radius) SSTtau042021: Aim: Characterize the molecular layer and dust disk properties, by estimating the temperature profile and density distribution to better understand the physical and chemical structure of the disk using the tomographic method and the DiskFit model. C. Foucher: Study of radial and vertical structure of the edge-on protoplanetary disk surrounding SSTtau042021 Observations - models 12 C O (3 -2 ) 13C O (21) C18 O (21) HC O+ (32) Key Results & Implications ❖Gas & Dust Structure: ➢Midplane temperatures ~8-12 K, molecular layer ~16 K, CO atmosphere ~31 K at 100 AU. ➢CO and HCO⁺ extend beyond the dust disk (~300 AU). ❖Vertical Stratification & Disk Winds: ➢HCO⁺ extends 30% higher than 13CO, consistent with intermediate altitude formation. ➢CO emission highly extended, with two toroidal gas structures possibly linked to H₂ winds (JWST). ❖Implications for Planet Formation: ➢Disk mass ~0.05 M☉. ➢HCO⁺ (3-2) thermalization helps constrain H₂ density (~3 × 10⁶ cm⁻³ at 100-200 AU). C. Foucher: Study of radial and vertical structure of the edge-on protoplanetary disk surrounding SSTtau042021 Observations - models 12 C O (3 -2 ) 13C O (21) C18 O (21) HC O+ (32) Key Results & Implications ❖Gas & Dust Structure: ➢Midplane temperatures ~8-12 K, molecular layer ~16 K, CO atmosphere ~31 K at 100 AU. ➢CO and HCO⁺ extend beyond the dust disk (~300 AU). ❖Vertical Stratification & Disk Winds: ➢HCO⁺ extends 30% higher than 13CO, consistent with intermediate altitude formation. ➢CO emission highly extended, with two toroidal gas structures possibly linked to H₂ winds (JWST). ❖Implications for Planet Formation: ➢Disk mass ~0.05 M☉. ➢HCO⁺ (3-2) thermalization helps constrain H₂ density (~3 × 10⁶ cm⁻³ at 100-200 AU). If you want more results come to see my poster !