Dynamical star-disk interaction in the young stellar system V354 Mon

Abstract

The main goal of this work is to characterize the mass accretion and ejection processes of the classical T Tauri star V354 Mon, a member of the young stellar cluster NGC 2264. In March 2008, photometric and spectroscopic observations of V354 Mon were obtained simultaneously with the CoRoT satellite, the 60 cm telescope at the Observatório Pico dos Dias (LNA - Brazil) equipped with a CCD camera and Johnson/Cousins BVRI filters, and the SOPHIE échelle spectrograph at the Observatoire de Haute-Provence (CNRS - France). The light curve of V354 Mon shows periodical minima (P = 5.26 +/- 0.50 days) that vary in depth and width at each rotational cycle. From the analysis of the photometric and spectroscopic data, it is possible to identify correlations between the emission line variability and the light-curve modulation of the young system, such as the occurrence of pronounced redshifted absorption in the H_alpha line at the epoch of minimum flux. This is evidence that during photometric minima we see the accretion funnel projected onto the stellar photosphere in our line of sight, implying that the hot spot coincides with the light-curve minima. We applied models of cold and hot spots and a model of occultation by circumstellar material to investigate the source of the observed photometric variations. We conclude that nonuniformly distributed material in the inner part of the circumstellar disk is the main cause of the photometric modulation, which does not exclude the presence of hot and cold spots at the stellar surface. It is believed that the distortion in the inner part of the disk is created by the dynamical interaction between the stellar magnetosphere, inclined with respect to the rotation axis, and the circumstellar disk, as also observed in the classical T Tauri star AA Tau and predicted by magnetohydrodynamical numerical simulations.

Accepted by Astronomy and Astrophysics

References in corpus (25)

• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The CoRoT satellite in flight : description and performance
• Observations of IC348: The Disk Population at 2-3 Million Years
• CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: II. Hot Spots and Variability
• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: I. Magnetospheric Flow at Different Theta
• MHD Simulations of Disk-Magnetized Star Interactions in Quiescent Regime: Funnel Flows and Angular Momentum Transport
• Eclipses by circumstellar material in the T Tauri star AA Tau. II. Evidence for non-stationary magnetospheric accretion
• On the formation of H-alpha line emission around classical T Tauri stars
• Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
• A rotational and variability study of a large sample of PMS stars in NGC 2264
• A Keck High Resolution Spectroscopic Study of the Orion Nebula Proplyds
• Accretion dynamics and disk evolution in NGC 2264: a study based on the Corot photometric observations
• Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AATau
• Non-stationary dynamo & magnetospheric accretion processes of the classical T Tauri star V2129 Oph
• Kinematics of NGC 2264: signs of cluster formation
• Accretion dynamics in the classical T Tauri star V2129 Oph
• ACIS-I observations of NGC2264. Membership and X-ray properties of PMS stars
• Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models
• Global 3D Simulations of Disc Accretion onto the classical T Tauri Star V2129 Oph
• Panchromatic observations and modeling of the HV Tau C edge-on disk
• CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
• Constraints on the disk geometry of the T Tauri star AA Tau from linear polarimetry
• Non-gray rotating stellar models and the evolutionary history of the Orion Nebular Cluster

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• Multi-epoch monitoring of the AA Tau like star V354 Mon - Indications for a low gas-to-dust ratio in the inner disk warp
• Investigating multi-frequency pulse profiles of PSRs B0329+54 and B1642-03 in an inverse Compton scattering (ICS) model
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• Complex Magnetospheric Accretion Flows in Low Accretor CVSO 1335
• CoRoT 223992193: Investigating the variability in a low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
• Modeling of CoRoT and Spitzer lightcurves in NGC 2264 caused by an optically thick warp
• A study of accretion and disk diagnostics in the NGC 2264 cluster
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