Protoplanetary Disks of T Tauri Binary Systems in the Orion Nebula Cluster

Abstract

We present a study of protoplanetary disks in spatially resolved low-mass binary stars in the Orion Nebula Cluster (ONC) to assess the impact of binarity on the properties of circumstellar disks. This is currently the largest such study in a clustered high-stellar-density star-forming environment. We particularly aim to determine the presence of magnetospheric accretion and dust disks for each binary component, and measure the overall disk frequency. We carried out spatially resolved adaptive-optics-assisted observations to acquire near-IR photometry and spectroscopy of 26 binaries in the ONC, and determine stellar parameters such as effective temperatures, spectral types, luminosities, and masses, as well as accretion properties and near-infrared excesses for the individual binary components. A fraction of 40(+10/-9)% of the binary components in the sample can be inferred to be T Tauri stars possessing an accretion disk, marginally fewer than the disk fraction of single stars. We find that disks in wide binaries of >200AU separation are consistent with random pairing, while the evolution of circumprimary and circumsecondary disks is observed to be synchronized in close binaries (separations <200AU). Circumbinary disks appear to be unsuitable to explain this difference. Furthermore, we identify several mixed pairs of accreting and non-accreting components, suggesting that these systems are common and that there is no preference for either the more or less massive component to evolve faster. The derived accretion luminosities and mass accretion rates of the ONC binary components are of similar magnitude as those for both ONC single stars and binaries in the Taurus star-forming region. The paper concludes with a discussion of the (presumably weak) connection between the presence of inner accretion disks in young binary systems and the existence of planets in stellar multiples.(abridged)

22 pages, 16 figures. Accepted for publication in Astronomy and Astrophysics

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• A Tale of Three Cities: OmegaCAM discovers multiple sequences in the color-magnitude diagram of the Orion Nebula Cluster
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• Runaway and walkaway stars from the ONC with Gaia DR2
• An ALMA Disk Mass for the Candidate Protoplanetary Companion to FW Tau
• NGTS clusters survey. I. Rotation in the young benchmark open cluster Blanco 1
• Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I
• The evolution of photo-evaporating viscous discs in binaries
• Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga
• On dust evolution in planet-forming discs in binary systems. I -- Theoretical and numerical modelling: radial drift is faster in binary discs
• An Improved HR Diagram for the Orion Trapezium Cluster
• Runaway Young Stars in the Orion Nebula
• Three-dimensional modeling of radiative disks in binaries
• The influence of radiative core growth on coronal X-ray emission from pre-main sequence stars
• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• The Taurus Boundary of Stellar/Substellar (TBOSS) Survey I: far-IR disk emission measured with Herschel
• The $Spitzer$ infrared spectrograph survey of protoplanetary disks in Orion A: I. disk properties
• Decoupling of a giant planet from its disk in an inclined binary system
• The JCMT Transient Survey: An Extraordinary Submillimetre Flare in the T Tauri Binary System JW 566
• Extreme radio flares and associated X-ray variability from young stellar objects in the Orion Nebula Cluster
• Raman mapping of photodissociation regions
• High signal-to-noise spectral characterization of the planetary-mass object HD 106906 b
• Multi-epoch, high spatial resolution observations of multiple T Tauri systems
• Stellar and circumstellar properties of visual binaries in the Orion Nebula Cluster
• The JCMT Transient Survey: Single Epoch Transients and Variability of Faint Sources
• The frequency of accretion disks around single stars: Chamaeleon I
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• Study of infrared excess from circumstellar disks in binaries with Spitzer/IRAC