Imaging the warped dusty disk wind environment of SU Aurigae with MIRC-X

Abstract

SU Aurigae is a widely studied T Tauri star and here we present original state-of-the-art interferometric observations with better uv and baseline coverage than previous studies. We aim to investigate the characteristics of the circumstellar material around SU Aur, constrain the disk geometry, composition and inner dust rim structure. The MIRC-X instrument at CHARA is a 6 telescope optical beam combiner offering baselines up to 331 m. We undertook image reconstruction for model-independent analysis, and fitted geometric models such as Gaussian and ring distributions. Additionally, the fitting of radiative transfer models constrains the physical parameters of the disk. Image reconstruction reveals a highly inclined disk with a slight asymmetry consistent with inclination effects obscuring the inner disk rim through absorption of incident star light on the near-side and thermal re-emission/scattering of the far-side. Geometric models find that the underlying brightness distribution is best modelled as a Gaussian with a FWHM of $1.53\pm 0.01\mathrm{mas}$ at an inclination of $56.9\pm 0.4^{\circ }$ and minor axis position angle of $55.9\pm 0.5^{\circ }$. Radiative transfer modelling shows a flared disk with an inner radius at 0.16 au which implies a grain size of $0.14\mu \mathrm{m}$ assuming astronomical silicates and a scale height of 9.0 au at 100 au. In agreement with literature, only the dusty disk wind successfully accounts for the NIR excess by introducing dust above the mid-plane. Our results confirm and provide better constraints than previous inner disk studies of SU Aurigae. We confirm the presence of a dusty disk wind in the cicumstellar environment, the strength of which is enhanced by a late infall event which also causes very strong misalignments between the inner and outer disks.

arXiv admin note: substantial text overlap with arXiv:2111.06205, arXiv:1905.11907

References in corpus (14)

• PPM-Extended (PPMX) - a catalogue of positions and proper motions
• Structure of Herbig AeBe disks at the milliarcsecond scale A statistical survey in the H band using PIONIER-VLTI
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Late infall causing disk misalignment and dynamic structures in SU Aur
• The evolution of stars in the Taurus-Auriga T association
• Cloudlet capture by Transitional Disk and FU Orionis stars
• Misaligned disks induced by infall
• Calibrated griz magnitudes of Tycho stars: All-sky photometric calibration using bright stars
• Resolving the FU Ori System with ALMA: Interacting Twin Disks?
• Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga
• SPARCO : a semi-parametric approach for image reconstruction of chromatic objects
• Viscous Heating and Boundary Layer Accretion in the Disk of Outbursting Star FU Orionis
• Dusty disk winds at the sublimation rim of the highly inclined, low mass YSO SU Aurigae
• The inner disk of RY Tau: evidence of stellar occultation by the disk atmosphere at the sublimation rim from K-band continuum interferometry
• Scattering and sublimation: a multi-scale view of $\mu$m-sized dust in the inclined disc of HD 145718

Cited by in corpus (2)

• Constraints on the (re-)orientation of star-disk systems through infall
• Dust in the wind of outbursting young stars