Understanding discs in binary YSOs – detailed modelling of VV CrA

Understanding discs in binary YSOs – detailed modelling of VV CrA
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了解二元 YSO 中的圆盘 â VV CrA 的详细建模

DOI:
10.1093/mnras/stw460
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发表时间:
2016
影响因子:
4.8
通讯作者:
L. Testi
L. Testi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
P. Scicluna;S. Wolf;T. Ratzka;G. Costigan;R. Launhardt;C. Leinert;F. Ober;C.F. Manara;L. Testi

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Given that a majority of stars form in multiple systems, in order to fully understand the star- and planet-formation processes we must seek to understand them in multiple stellar systems. With this in mind, we present an analysis of the enigmatic binary T-Tauri system VV Corona Australis, in which both components host discs, but only one is visible at optical wavelengths. We seek to understand the peculiarities of this system by searching for a model for the binary which explains all the available continuum observations of the system. We present new mid-infrared interferometry and near-infrared (NIR) spectroscopy along with archival millimetre-wave observations, which resolve the binary at 1.3 mm for the first time. We compute a grid of pre-main-sequence radiative transfer models and calculate their posterior probabilities given the observed spectral energy distributions and mid-infrared interferometric visibilities of the binary components, beginning with the assumption that the only differences between the two components are their inclination and position angles. Our best-fitting solution corresponds to a relatively low-luminosity T-tauri binary, with each component's disc having a large scaleheight and viewed at moderate inclination (∼50°), with the infrared companion inclined by ∼5° more than the primary. Comparing the results of our model to evolutionary models suggests stellar masses ∼1.7 M⊙and an age for the system of 3.5 Myr, towards the upper end of previous estimates. Combining these results with accretion indicators from NIR spectroscopy, we determine an accretion rate of 4.0 × 10−8M⊙yr−1for the primary. We suggest that future observations of VV Corona Australis and similar systems should prioritize high angular resolution sub-mm and NIR imaging of the discs and high-resolution optical/NIR spectroscopy of the central stars.
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