Dynamics of wind and the dusty environments in the accreting T Tauri stars RY Tau and SU Aur

Abstract

Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of simultaneous spectroscopic and photometric observations of the classical T Tauri stars RY Tau and SU Aur with the aim to quantify the accretion and outflow dynamics at time scales from days to years. It is shown that dust in the disc wind is the main source of photometric variability of these stars. In RY Tau we observed a new effect: during events of enhanced outflow the circumstellar extinction gets lower. The characteristic time of changes in outflow velocity and stellar brightness indicates that the obscuring dust is near the star. The outflow activity in both stars is changing on a time scale of years. Periods of quiescence in H$\alpha$ profile variability were observed during 2015-2016 season in RY Tau and during 2016-2017 season in SU Aur. We interpret these findings in the framework of the magnetospheric accretion model, and discuss how the global stellar magnetic field may influence the long-term variations of the outflow activity.

arXiv comment17 pages, 13 figures, 4 tables, accepted for publication in MNRAS

References in corpus (37)

• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
• Accretion-powered Stellar Winds as a Solution to the Stellar Angular Momentum Problem
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• Launching of Conical Winds and Axial Jets from the Disk-Magnetosphere Boundary: Axisymmetric and 3D Simulations
• Unveiling the Inner Disk Structure of T Tauri Stars
• MHD simulations of accretion onto a dipolar magnetosphere. II. Magnetospheric ejections and stellar spin-down
• Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars
• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• Close Companions to Young Stars. I. A Large Spectroscopic Survey in Chamaeleon I and Taurus-Auriga
• Investigating planet formation in circumstellar disks: CARMA observations of RY Tau and DG Tau
• Non-stationary dynamo & magnetospheric accretion processes of the classical T Tauri star V2129 Oph
• Profiles of Strong Permitted Lines in Classical T Tauri Stars
• Observations and modeling of the inner disk region of T Tauri stars
• Classical T Tauri stars: magnetic fields, coronae, and star-disc interactions
• Multidimensional models of hydrogen and helium emission line profiles for classical T Tauri Stars: method, tests and examples
• Magnetometry of the classical T Tauri star GQ Lup: non-stationary dynamos & spin evolution of young Suns
• Probing the circumstellar structures of T Tauri stars and their relationship to those of Herbig stars
• Accretion, Outflows, and Winds of Magnetized Stars
• Testing Models of Accretion-driven Coronal Heating and Stellar Wind Acceleration for T Tauri Stars
• Optical spectroscopic variability of Herbig Ae/Be stars
• The T Tauri star RY Tau as a case study of the inner regions of circumstellar dust disks
• High-Contrast Near-Infrared Imaging Polarimetry of the Protoplanetary Disk around RY Tau
• Line formation in the inner winds of classical T Tauri stars: testing the conical-shell wind solution
• Evidence for stellar driven outflows from the Classical T Tauri star RY Tau
• Time-series Paschen-beta spectroscopy of SU Aurigae
• Multi-Site observations of SU Aurigae
• Time Variability of Emission Lines for Four Active T Tauri Stars (I): October--December in 2010
• Near-IR High-Resolution Imaging Polarimetry of the SU Aur Disk: Clues for Tidal Tails?
• Precise High-Cadence Time Series of Five Variable Young Stars in Auriga with MOST
• Resolving the Inner Arcsecond of the RY Tau Jet With HST
• Imaging the circumstellar environment of the young T Tauri star SU Aurigae
• Spectral line profiles changed by dust scattering in heavily obscured young stellar objects
• Chandra and XMM-Newton X-ray Observations of the Hyperactive T Tauri Star RY Tau
• MHD simulations of disk-star interaction

Cited by in corpus (11)

• The inner disk of RY Tau: evidence of stellar occultation by the disk atmosphere at the sublimation rim from K-band continuum interferometry
• Time-Variable Jet Ejections from RW Aur A, RY Tau and DG Tau
• Dust entrainment in photoevaporative winds: Densities and imaging
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Scattered light detection of a possible disk wind in RY Tau
• Modulated accretion in T Tauri star RY Tau -- stable MHD propeller or a planet at 0.2 AU?
• Infrared Variability due to Magnetic Pressure Driven Jets, Dust Ejection and Quasi-Puffed-Up Inner Rims
• Imaging the warped dusty disk wind environment of SU Aurigae with MIRC-X
• Density streams in the disc winds of Classical T Tauri stars
• Monitoring inner regions in the RY Tau jet
• Scattering and sublimation: a multi-scale view of $\mu$m-sized dust in the inclined disc of HD 145718
• The MATISSE view of the inner region of the RY Tau protoplanetary disk