Pre-main-sequence binaries with tidally disrupted discs: the Br gamma in HD 104237
arXiv:1301.0276 · doi:10.1093/mnras/stt005
Abstract
Active pre-main-sequence binaries with separations of around ten stellar radii present a wealth of phenomena unobserved in common systems. The study of these objects is extended from Classical T Tauri stars to the Herbig Ae star HD 104237. Spectro-interferometry with the VLTI/AMBER is presented. It is found that the K-band continuum squared visibilities are compatible with a circumbinary disc with a radius of ~0.5 AU. However, a significant fraction (~50 per cent) of the flux is unresolved and not fully accounted by the stellar photospheres. The stars probably don't hold circumstellar discs, in addition to the circumbinary disk, due to the combined effects of inner magnetospheric truncation and outer tidal truncation. This unresolved flux likely arises in compact structures inside the tidally disrupted circumbinary disc. Most ( per cent) of the Br gamma line emission is unresolved. The line-to-continuum spectro-astrometry shifts in time, along the direction of the Ly alpha jet known to be driven by the system. The shift is anti-correlated with the Br gamma equivalent width. It is shown that the unresolved Br gamma emission cannot originate in the jet but instead is compatible with stellar emission from the orbiting binary components. The increase in the absolute value of the equivalent width of the line takes place at periastron passage; it could arise in an accretion burst, a flare or in the increase in effective size of the emission region by the interaction of the magnetospheres. The binary longitude of the ascending node is found to be $Ω=(235\pm3)\degr$ and the orbit retrograde. The origin of the jet is revisited. The tidal disruption of the circumstellar disks creates difficulties to ejection models that rely on stellar magnetosphere and disc coupling. A scenario of a stellar wind collimated by a circumbinary disc wind is suggested.
16 pages, accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal This version corrects some typos identified at proofs stage
References in corpus (51)
- Passive irradiated circumstellar disks with an inner hole
- Resolved Images of Large Cavities in Protoplanetary Transition Disks
- Accretion-powered Stellar Winds as a Solution to the Stellar Angular Momentum Problem
- Interferometric data reduction with AMBER/VLTI.Principle,estimators and illustration
- Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
- Accretion Rates in Herbig Ae stars
- The Shape of the Inner Rim in Proto-Planetary Disks
- A Resolved Census of Millimeter Emission from Taurus Multiple Star Systems
- Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
- Circumstellar and Circumbinary Disks in Eccentric Stellar Binaries
- Accretion funnels onto weakly magnetized young stars
- The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
- On the binarity of Herbig Ae/Be stars
- Warm Gas in the Inner Disks around Young Intermediate Mass Stars
- Circumbinary disk evolution
- A search for strong, ordered magnetic fields in Herbig Ae/Be stars
- A catalog of bright calibrator stars for 200-meter baseline near-infrared stellar interferometry
- Multidimensional models of hydrogen and helium emission line profiles for classical T Tauri Stars: method, tests and examples
- Near-Infrared interferometry of Eta Carinae with high spatial and spectral resolution using the VLTI and the AMBER instrument
- Origins of the H, He I, and Ca II Line Emission in Classical T Tauri Stars
- Turbulence-driven Polar Winds from T Tauri Stars Energized by Magnetospheric Accretion
- Disk and wind interaction in the young stellar object MWC 297 spatially resolved with VLTI/AMBER
- X-Ray flares in Orion Young Stars. II. Flares, Magnetospheres, and Protoplanetary Disks
- Direct Imaging of Bridged Twin Protoplanetary Disks in a Young Multiple Star
- Testing Models of Accretion-driven Coronal Heating and Stellar Wind Acceleration for T Tauri Stars
- Periodic accretion from a circumbinary disk in the young binary UZ Tau E
- Gas Accretion from a Circumbinary Disk
- The Structure of Magnetocentrifugal Winds I. Steady Mass Loading
- VLTI/AMBER spectro-interferometry of the Herbig Be star MWC 297 with spectral resolution 12 000
- Spatially and Spectrally Resolved Hydrogen Gas within 0.1 AU of T Tauri and Herbig Ae/Be Stars
- Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD104237
- Modelling Circumbinary Gas Flows in Close T Tauri Binaries
- Spatially Extended Brackett Gamma Emission in the Environments of Young Stars
- Evidence for Residual Material in Accretion Disk Gaps: CO Fundamental Emission from the T Tauri Spectroscopic Binary DQ Tau
- Testing pre-main sequence models: the power of a Bayesian approach
- Recurring millimeter flares as evidence for star-star magnetic reconnection events in the DQ Tauri PMS binary system
- Magnetically Controlled Accretion Flows onto Young Stellar Objects
- Magnetic launching and collimation of jets from the disk-magnetosphere boundary: 2.5D MHD simulations
- The Young Binary DQ Tau: A Hunt For X-ray Emission From Colliding Magnetospheres
- X-winds in Action
- Circumbinary Gas Accretion onto a Central Binary: Infrared Molecular Hydrogen Emission from GG Tau A
- High resolution imaging of the GG Tau system at 267 GHz
- Geometrical and Physical Properties of Circumbinary Discs in Eccentric Stellar Binaries
- The 2008 outburst in the young stellar system ZCMa: I. Evidence of an enhanced bipolar wind on the AU-scale
- On the alignment between the circumstellar disks and orbital planes of Herbig Ae/Be binary systems
- Wall emission in circumbinary disks: the case of CoKu Tau/4
- Nonradial and nonpolytropic astrophysical outflows IX. Modeling T Tauri jets with a low mass-accretion rate
- First result with AMBER+FINITO on the VLTI: The high-precision angular diameter of V3879 Sgr
- Interferometric Evidence for Resolved Warm Dust in the DQ Tau System
- Hunting for millimeter flares from magnetic reconnection in pre-main sequence spectroscopic binaries
- Spectroscopic monitoring of the Herbig Ae star HD 104237. II. Non-radial pulsations, mode analysis and fundamental stellar parameters
Cited by in corpus (14)
- The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
- Precession and accretion in circumbinary discs: The case of HD 104237
- A CO survey in planet-forming disks: characterizing the gas content in the epoch of planet formation
- AMBER/VLTI high spectral resolution observations of the Br emitting region in HD 98922. A compact disc wind launched from the inner disc region
- GW Ori: Inner disk readjustments in a triple system
- On the Mass Accretion Rates of Herbig Ae/Be Stars. Magnetospheric Accretion or Boundary Layer?
- The far-infrared behaviour of Herbig Ae/Be discs: Herschel PACS photometry
- A resolved, au-scale gas disk around the B[e] star HD 50138
- A binary system in the S cluster close to the supermassive black hole Sagittarius A*
- A study of the wiggle morphology of HH 211 through numerical simulations
- Interferometric study on the temporal variability of the brightness distributions of protoplanetary disks
- New binaries in the epsilon Cha association
- The two magnetic components in the Herbig Ae SB2 system HD 104237
- ISPY -- NaCo Imaging Survey for Planets around Young stars. CenteR: the impact of centering and frame selection