The accretion process in the DQ Tau binary system

Abstract

Mass accretion from the circumstellar disk onto the protostar is a fundamental process during star formation. Measuring the mass accretion rate is particularly challenging for stars belonging to binary systems, because it is often difficult to discriminate which component is accreting. DQ~Tau is an almost equal-mass spectroscopic binary system where the components orbit each other every 15.8~days. The system is known to display pulsed accretion, i.e., the periodic modulation of the accretion by the components on eccentric orbit. We present multiepoch ESO/VLT X-Shooter observations of DQ~Tau, with the aim to determine which component of this system is the main accreting source. We use the absorption lines in the spectra to determine the radial velocity of the two components, and measure the continuum veiling as a function of wavelength and time. We fit the observed spectra with non-accreting templates to correct for the photospheric and chromospheric contribution. In the corrected spectra we study in details the profiles of the emission lines and calculate mass accretion rates for the system as a function of orbital phase. In accordance with previous findings, we detect elevated accretion close to periastron. We measure that the accretion rate varies between $10^{-8.5}$ and $10^{-7.3}$ Msun/yr. The emission line profiles suggest that both stars are actively accreting and the dominant accretor is not always the same component, varying in few orbits.

arXiv comment22 pages, 19 figures

References in corpus (37)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• A library of high resolution synthetic stellar spectra from 300nm to 1.8 micron with solar and alpha-enhanced composition
• X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
• Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
• Accretion into the Central Cavity of a Circumbinary Disk
• X-shooter spectroscopy of young stellar objects: I - Mass accretion rates of low-mass T Tauri stars in σOrionis
• X-Shooter study of accretion in Chamaeleon I: II. A steeper increase of accretion with stellar mass for very low mass stars?
• X-Shooter spectroscopy of young stellar objects: II. Impact of chromospheric emission on accretion rate estimates
• Binary Black Hole Accretion Flows in Merged Galactic Nuclei
• Circumbinary disk evolution
• Python Leap Second Management and Implementation of Precise Barycentric Correction (barycorrpy)
• Spectral variability of classical T Tauri stars accreting in an unstable regime
• Pulsed Accretion onto Eccentric and Circular Binaries
• Accretion, Outflows, and Winds of Magnetized Stars
• Constraining disk evolution prescriptions of planet population synthesis models with observed disk masses and accretion rates
• A Disk-based Dynamical Constraint on the Mass of the Young Binary DQ Tau
• Recurring millimeter flares as evidence for star-star magnetic reconnection events in the DQ Tauri PMS binary system
• KMOS study of the mass accretion rate from Class I to Class II in NGC 1333
• HST spectra reveal accretion in MY Lupi
• Binary accretion rates: dependence on temperature and mass-ratio
• Accretion and Magnetic Reconnection in the Classical T Tauri Binary DQ Tau
• Interpretation of the Veiling of the Photospheric Spectrum for T Tauri Stars in Terms of an Accretion Model
• Three-dimensional simulations of rotationally-induced line variability from a Classical T Tauri star with a misaligned magnetic dipole
• GIARPS High-resolution Observations of T Tauri stars (GHOsT). III. A pilot study of stellar and accretion properties
• Line-dependent veiling in very active T Tauri Stars
• Spots, flares, accretion, and obscuration in the pre-main sequence binary DQ Tau
• On the mid-IR variability of candidate eruptive variables (EXors): a comparison between Spitzer and WISE data
• Binary Black Hole Accretion Flows From a Misaligned Circumbinary Disk
• The Inner Disk and Accretion Flow of the Close Binary DQ Tau

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