Pulsed Accretion in the T Tauri Binary TWA 3A

Abstract

TWA 3A is the most recent addition to a small group of young binary systems that both actively accrete from a circumbinary disk and have spectroscopic orbital solutions. As such, it provides a unique opportunity to test binary accretion theory in a well-constrained setting. To examine TWA 3A's time-variable accretion behavior, we have conducted a two-year, optical photometric monitoring campaign, obtaining dense orbital phase coverage (~20 observations per orbit) for ~15 orbital periods. From U-band measurements we derive the time-dependent binary mass accretion rate, finding bursts of accretion near each periastron passage. On average, these enhanced accretion events evolve over orbital phases 0.85 to 1.05, reaching their peak at periastron. The specific accretion rate increases above the quiescent value by a factor of ~4 on average but the peak can be as high as an order of magnitude in a given orbit. The phase dependence and amplitude of TWA 3A accretion is in good agreement with numerical simulations of binary accretion with similar orbital parameters. In these simulations, periastron accretion bursts are fueled by periodic streams of material from the circumbinary disk that are driven by the binary orbit. We find that TWA 3A's average accretion behavior is remarkably similar to DQ Tau, another T Tauri binary with similar orbital parameters, but with significantly less variability from orbit to orbit. This is only the second clear case of orbital-phase-dependent accretion in a T Tauri binary.

6 pages, 4 figures

References in corpus (26)

• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• The Dartmouth Stellar Evolution Database
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• 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
• Observations of gas flows inside a protoplanetary gap
• Kepler-47: A Transiting Circumbinary Multi-Planet System
• Mapping the Shores of the Brown Dwarf Desert II: Multiple Star Formation in Taurus-Auriga
• Gas Flow Across Gaps in Protoplanetary Disks
• Planetary System Disruption by Galactic Perturbations to Wide Binary Stars
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• Circumbinary disk evolution
• Classical T Tauri stars: magnetic fields, coronae, and star-disc interactions
• Pulsed Accretion onto Eccentric and Circular Binaries
• The TW Hydrae Association : trigonometric parallaxes and kinematic analysis
• Measuring tiny mass accretion rates onto young brown dwarfs
• Radial-velocity survey of members and candidate members of the TW Hydrae association
• Truncated Disks in TW Hya Association Multiple Star Systems
• Periodic accretion from a circumbinary disk in the young binary UZ Tau E
• Relativistic Dynamics and Mass Exchange in Binary Black Hole Mini-Disks
• M Dwarf Flare Continuum Variations on One-Second Timescales: Calibrating and Modeling of ULTRACAM Flare Color Indices
• Pulsed Accretion in a Variable Protostar
• Accretion and Magnetic Reconnection in the Classical T Tauri Binary DQ Tau
• Circumbinary Gas Accretion onto a Central Binary: Infrared Molecular Hydrogen Emission from GG Tau A
• Mid-infrared imaging of the young binary star Hen 3-600: Evidence for a dust disk around the primary
• Near-Infrared Imaging Polarimetry of Inner Region of GG Tau A Disk

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• Orbital Evolution of Equal-mass Eccentric Binaries due to a Gas Disk: Eccentric Inspirals and Circular Outspirals
• Orbital Evolution of Binaries in Circumbinary Disks
• Quantifying Variability of YSOs in the Mid-IR Over Six Years with NEOWISE
• The JCMT Transient Survey: Detection of sub-mm variability in a Class I protostar EC 53 in Serpens Main
• Long-term Evolution of Binary Orbits Induced by Circumbinary Disks
• Photometric variability of TW~Hya from seconds to years as seen from space and the ground in 2013-2017
• The Effect of Binarity on Circumstellar Disk Evolution
• A coplanar circumbinary protoplanetary disk in the TWA 3 triple M dwarf system
• Star-disk interactions in multi-band photometric monitoring of the classical T Tauri star GI Tau
• K2 reveals pulsed accretion driven by the 2 Myr old hot Jupiter CI Tau b
• Large amplitude periodic outbursts and long period variables in the VVV VIRAC2-$\beta$ database
• Pulsed Disc Accretion Driven by Hot Jupiters
• The role of turbulence during the formation of circumbinary discs
• Long-lived protoplanetary disks in multiple systems: the VLA view of HD 98800
• The Inner Disk and Accretion Flow of the Close Binary DQ Tau
• The dependence of episodic accretion on eccentricity during the formation of binary stars
• AGB interlopers in YSO catalogues hunted out by NEOWISE
• Periodic Eruptive Variability of the Isolated Pre-Main Sequence Star V347 Aurigae
• Ro-vibrational Spectroscopy of CI Tau -- Evidence of a Multi-Component Eccentric Disk Induced by a Planet
• A Low-Mass Pre-Main-Sequence Eclipsing Binary in Lower Centaurus Crux Discovered with TESS
• Optical and Near-Infrared Excesses are Correlated in T Tauri Stars
• Orbital Solution for the Spectroscopic Binary in the GW Ori Hierarchical Triple
• The ionizing source of the bipolar HII region S106: a close massive binary
• The GRAVITY young stellar object survey V. The orbit of the T Tauri binary star WW Cha
• Accretion Kinematics in the T Tauri Binary TWA 3A: Evidence for Preferential Accretion onto the TWA 3A Primary