Accretion Kinematics in the T Tauri Binary TWA 3A: Evidence for Preferential Accretion onto the TWA 3A Primary
arXiv:1910.12878 · doi:10.3847/1538-3881/ab4f7d
Abstract
We present time-series, high-resolution optical spectroscopy of the eccentric T Tauri binary TWA 3A. Our analysis focuses on variability in the strength and structure of the accretion tracing emission lines H alpha and He I 5876A. We find emission line strengths to display the same orbital-phase dependent behavior found with time-series photometry, namely, bursts of accretion near periastron passages. Such bursts are in good agreement with numerical simulations of young eccentric binaries. During accretion bursts, the emission of He I 5876A consistently traces the velocity of the primary star. After removing a model for the system's chromospheric emission, we find the primary star typically emits ~70% of the He I accretion flux. We interpret this result as evidence for circumbinary accretion streams that preferentially feed the TWA 3A primary. This finding is in contrast to most numerical simulations, which predict the secondary should be the dominant accretor in a binary system. Our results may be consistent with a model in which the precession of an eccentric circumbinary disk gap alternates between preferentially supplying mass to the primary and secondary.
arXiv comment29 pages, 16 figures, AJ, accepted
References in corpus (72)
- Astropy: A Community Python Package for Astronomy
- The NumPy array: a structure for efficient numerical computation
- Gaia Data Release 2. Summary of the contents and survey properties
- The Gaia mission
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- Gaia Data Release 2: The astrometric solution
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- A Survey of Stellar Families: Multiplicity of Solar-Type Stars
- The Dartmouth Stellar Evolution Database
- Cosmic-Ray Rejection by Laplacian Edge Detection
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- Las Cumbres Observatory Global Telescope Network
- Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
- 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
- Massive black hole binary mergers within sub-pc scale gas discs
- UV excess measures of accretion onto young very low-mass stars and brown dwarfs
- Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
- Mapping the Shores of the Brown Dwarf Desert II: Multiple Star Formation in Taurus-Auriga
- Star and protoplanetary disk properties in Orion's suburbs
- A Moving Cluster Distance to the Exoplanet 2M1207 B in the TW Hya Association
- Limiting eccentricity of sub-parsec massive black hole binaries surrounded by self-gravitating gas discs
- Viscous Hydrodynamics Simulations of Circumbinary Accretion Discs: Variability, Quasi-Steady State, and Angular Momentum Transfer
- Magneto-thermal Disk Wind from Protoplanetary Disks
- On the tilting of protostellar disks by resonant tidal effects
- X-Shooter spectroscopy of young stellar objects: II. Impact of chromospheric emission on accretion rate estimates
- Tidal Truncation of Inclined Circumstellar and Circumbinary Discs in Young Stellar Binaries
- Binary Black Hole Accretion Flows in Merged Galactic Nuclei
- Estimating distances from parallaxes. II. Performance of Bayesian distance estimators on a Gaia-like catalogue
- Evidence for Disk Photoevaporation Driven by the Central Star
- Circumbinary disk evolution
- Placing the spotted T Tauri star LkCa 4 on an HR diagram
- Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
- 99 Herculis: Host to a Circumbinary Polar-ring Debris Disk
- Kinematic links and the co-evolution of MHD winds, jets, and inner disks from a high-resolution optical [OI] survey
- A New Look at T Tauri Star Forbidden Lines: MHD Driven Winds from the Inner Disk
- Radial Velocity Studies of Close Binary Stars.IV
- Classical T Tauri stars: magnetic fields, coronae, and star-disc interactions
- Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region
- Pulsed Accretion onto Eccentric and Circular Binaries
- Polar alignment of a protoplanetary disk around an eccentric binary
- Characterizing the IYJ Excess Continuum Emission in T Tauri Stars
- Measuring tiny mass accretion rates onto young brown dwarfs
- A circumbinary protoplanetary disc in a polar configuration
- Accretion dynamics in the classical T Tauri star V2129 Oph
- Truncated Disks in TW Hya Association Multiple Star Systems
- Theoretical spectra of photoevaporating protoplanetary discs: An atlas of atomic and low-ionisation emission lines
- Precession and accretion in circumbinary discs: The case of HD 104237
- Periodic accretion from a circumbinary disk in the young binary UZ Tau E
- An extensive VLT/X-Shooter library of photospheric templates of pre-main sequence stars
- Blueshifted [OI] lines from protoplanetary discs: the smoking gun of X-ray photoevaporation
- Linear Analysis of the Evolution of Nearly Polar Low Mass Circumbinary Discs
- The VLTI / PIONIER near-infrared interferometric survey of southern T Tauri stars. I. First results
- Modelling Circumbinary Gas Flows in Close T Tauri Binaries
- Locating the Trailing Edge of the Circumbinary Ring in the KH 15D System
- A Disk-based Dynamical Constraint on the Mass of the Young Binary DQ Tau
- TW Hya: Spectral Variability, X-Rays, and Accretion Diagnostics
- Accretion and Magnetic Reconnection in the Classical T Tauri Binary DQ Tau
- Binary accretion rates: dependence on temperature and mass-ratio
- Inner disk structure of the classical T Tauri star LkCa 15
- Mid-infrared imaging of the young binary star Hen 3-600: Evidence for a dust disk around the primary
- Natural Coronagraphic Observations of the Eclipsing T Tauri System KH 15D: Evidence for Accretion and Bipolar Outflow in a WTTS
- Pulsed Accretion in the T Tauri Binary TWA 3A
- The evolution of the mass ratio of accreting binaries: the role of gas temperature
- The TWA 3 Young Triple System: Orbits, Disks, Evolution
- Testing dust trapping in the circumbinary disk around GG Tau A
- Observational signatures of linear warps in circumbinary discs
- Binary Black Hole Accretion Flows From a Misaligned Circumbinary Disk
- Eccentric Modes in Disks With Pressure and Self-Gravity
- The Inner Disk and Accretion Flow of the Close Binary DQ Tau
- Complex Magnetospheric Accretion Flows in Low Accretor CVSO 1335
- Forbidden Line Emission in the Eccentric Spectroscopic Binaries DQ Tauri and UZ Tauri E Monitored over an Orbital Period
Cited by in corpus (14)
- TESS Hunt for Young and Maturing Exoplanets (THYME) VI: an 11 Myr giant planet transiting a very low-mass star in Lower Centaurus Crux
- Long-Lived Eccentric Modes in Circumbinary Disks
- TESS Hunt for Young and Maturing Exoplanets (THYME) VII : Membership, rotation, and lithium in the young cluster Group-X and a new young exoplanet
- SPYGLASS. III. The Fornax-Horologium Association and its Traceback History within the Austral Complex
- A coplanar circumbinary protoplanetary disk in the TWA 3 triple M dwarf system
- SPYGLASS. II. The Multi-Generational and Multi-Origin Star Formation History of Cepheus Far North
- Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): A close low mass companion to ET Cha
- A multi-epoch, multi-wavelength study of the classical FUor V1515 Cyg approaching quiescence
- Periodic Eruptive Variability of the Isolated Pre-Main Sequence Star V347 Aurigae
- Observationally Constraining the Starspot Properties of Magnetically Active M67 Sub-Subgiant S1063
- A Low-Mass Pre-Main-Sequence Eclipsing Binary in Lower Centaurus Crux Discovered with TESS
- A Low-mass, Pre-main-sequence Eclipsing Binary in the 40 Myr Columba Association -- Fundamental Stellar Parameters and Modeling the Effect of Star Spots
- Transit Hunt for Young and Maturing Exoplanets (THYME) VIII: a Pleiades-age association harboring two transiting planetary systems from Kepler
- A 2+1+1 quadruple star system containing the most eccentric, low-mass, short-period, eclipsing binary known