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2011MNRAS.415.2812W - Mon. Not. R. Astron. Soc., 415, 2812-2817 (2011/August-2)
The immediate environment of the class 0 protostar VLA 1623, on scales of ∼50–100 au, observed at millimetre and centimetre wavelengths.
WARD-THOMPSON D., KIRK J.M., GREAVES J.S. and ANDRE P.
Abstract (from CDS):
We estimate an upper limit to the VLA 1623A disc mass of ≤ 0.13 M☉ and an upper limit to its radius of ∼ 50 au. The longer wavelength data have a spectral index of α ∼ 0.6±0.3. This is too steep to be explained by optically thin free–free emission. It is most likely due to optically thick free–free emission. Alternatively, we speculate that it might be due to the formation of larger grains or planetesimals in the circumstellar disc. We estimate the mass of VLA 1623B to be ≤ 0.15 M☉. We can place a lower limit to its size of ∼ 30 {x} 7 au, and an upper limit to its diameter of ∼ 100 au. The longer wavelength data of VLA 1623B also have a spectral index of α ∼ 0.6±0.3. The nature of VLA 1623B remains a matter of debate. It could be a binary companion to the protostar, or a knot in the radio jet from VLA 1623A.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: interferometric - stars: formation - stars: protostars
Simbad objects: 12
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