Magnetospheric accretion in the intermediate-mass T Tauri star HQ Tau

Abstract

Context. Classical T Tauri stars (cTTs) are pre-main sequence stars surrounded by an accretion disk. They host a strong magnetic field, and both magnetospheric accretion and ejection processes develop as the young magnetic star interacts with its disk. Studying this interaction is a major goal toward understanding the properties of young stars and their evolution. Aims. The goal of this study is to investigate the accretion process in the young stellar system HQ Tau, an intermediate-mass T Tauri star (1.9 M${}_{\odot }$). Methods. The time variability of the system is investigated both photometrically, using Kepler-K2 and complementary light curves, and from a high-resolution spectropolarimetric time series obtained with ESPaDOnS at CFHT. Results. The quasi-sinusoidal Kepler-K2 light curve exhibits a period of 2.424 d, which we ascribe to the rotational period of the star. The radial velocity of the system shows the same periodicity, as expected from the modulation of the photospheric line profiles by surface spots. A similar period is found in the red wing of several emission lines (e.g., HI, CaII, NaI), due to the appearance of inverse P Cygni components, indicative of accretion funnel flows. Signatures of outflows are also seen in the line profiles, some being periodic, others transient. The polarimetric analysis indicates a complex, moderately strong magnetic field which is possibly sufficient to truncate the inner disk close to the corotation radius, r${}_{cor}$ $\sim$3.5 R${}_{\star }$. Additionally, we report HQ Tau to be a spectroscopic binary candidate whose orbit remains to be determined. Conclusions. The results of this study expand upon those previously reported for low-mass T Tauri stars, as they indicate that the magnetospheric accretion process may still operate in intermediate-mass pre-main sequence stars, such as HQ Tau.

arXiv comment15 pages, 15 figures, accepted in A&A

References in corpus (54)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Understanding the Lomb-Scargle Periodogram
• The surprising magnetic topology of tauSco: fossil remnant or dynamo output?
• 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
• Assessing statistical significance of periodogram peaks
• Seismic diagnostics for transport of angular momentum in stars 1. Rotational splittings from the PMS to the RGB
• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• SOAP 2.0: A tool to estimate the photometric and radial velocity variations induced by stellar spots and plages
• Compact Disks in a High Resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
• On the Interferometric Sizes of Young Stellar Objects
• MHD simulations of accretion onto a dipolar magnetosphere. II. Magnetospheric ejections and stellar spin-down
• Eclipses by circumstellar material in the T Tauri star AA Tau. II. Evidence for non-stationary magnetospheric accretion
• Magnetic fields and accretion flows on the classical T Tauri star V2129 Oph
• Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
• The evolution of surface magnetic fields in young solar-type stars I: the first 250 Myr
• Accretion funnels onto weakly magnetized young stars
• Close Companions to Young Stars. I. A Large Spectroscopic Survey in Chamaeleon I and Taurus-Auriga
• The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
• Mapping accretion and its variability in the young open cluster NGC 2264: a study based on u-band photometry
• The evolution of surface magnetic fields in young solar-type stars II: The early main sequence (250-650 Myr)
• Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AATau
• New periodic variable stars coincident with ROSAT sources discovered using SuperWASP
• Accretion rates and accretion tracers of Herbig Ae/Be stars
• The Stellar Membership of the Taurus Star-forming Region
• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• The large-scale magnetic field and poleward mass accretion of the classical T Tauri star TW Hya
• Resolved young binary systems and their disks
• Dust Transport in Protostellar Disks Through Turbulence and Settling
• The many-faceted light curves of young disk-bearing stars in Upper Sco and $\rho$ Oph observed by $K2$ Campaign 2
• Chemical abundances of magnetic and non-magnetic Herbig Ae/Be stars
• Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha
• Connection between jets, winds and accretion in T Tauri stars: the X-shooter view
• Magnetometry of the classical T Tauri star GQ Lup: non-stationary dynamos & spin evolution of young Suns
• A kinematic study of the Taurus-Auriga T association
• Rotation of Low-Mass Stars in Taurus with K2
• Accretion dynamics in the classical T Tauri star V2129 Oph
• Fundamental properties of pre-main sequence stars in young, southern star forming regions: metallicities
• UV variability and accretion dynamics in the young open cluster NGC 2264
• The magnetic fields of intermediate-mass T Tauri stars : I. Magnetic detections and fundamental stellar parameters
• Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models
• Chemical composition of the Taurus-Auriga association
• The magnetic field and accretion regime of CI Tau
• The magnetic propeller accretion regime of LkCa 15
• Inner disk structure of the classical T Tauri star LkCa 15
• Identification of Young Stellar Variables with KELT for K2 I: Campaign 13 Taurus Dippers and Rotators
• Characterising the surface magnetic fields of T Tauri stars with high-resolution near-infrared spectroscopy
• Time-series Paschen-beta spectroscopy of SU Aurigae
• The Mean Magnetic Field Strength of CI Tau
• Orbital parameters, chemical composition, and magnetic field of the Ap binary HD 98088
• Narrow Na and K Absorption Lines Toward T Tauri Stars - Tracing the Atomic Envelope of Molecular Clouds
• Equation of the field lines of an axisymmetric multipole with a source surface
• A search for passive protoplanetary disks in the Taurus-Auriga star-forming region

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• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• Investigating the magnetospheric accretion process in the young pre-transitional disk system DoAr 44 (V2062~Oph). A multiwavelength interferometric, spectropolarimetric, and photometric observing campaign
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• Accretion variability from minutes to decade timescales in the classical T Tauri star CR Cha
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• Star-disk interaction in the T Tauri star V2129 Oph: An evolving accretion-ejection structure
• Stable accretion and episodic outflows in the young transition disk system GM Aurigae
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