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The Influence of Forming Companions on the Spectral Energy Distributions of Stars with Circumstellar Discs
Zakhozhay, Olga V.
AA(Main Astronomical Observatory, National Academy of Sciences of Ukraine, Kyiv, 03143, Ukraine)
Publications of the Astronomical Society of Australia, Volume 34, id.e015 9 pp. (PASA Homepage)
Publication Date:
Astronomy Keywords:
planet-disc interactions, planets and satellites: formation, planetary systems, protoplanetary disks
Abstract Copyright:
2017: Astronomical Society of Australia
Bibliographic Code:


We study a possibility to detect signatures of brown dwarf companions in a circumstellar disc based on spectral energy distributions. We present the results of spectral energy distribution simulations for a system with a 0.8 M&sun; central object and a companion with a mass of 30 M J embedded in a typical protoplanetary disc. We use a solution to the one-dimensional radiative transfer equation to calculate the protoplanetary disc flux density and assume, that the companion moves along a circular orbit and clears a gap. The width of the gap is assumed to be the diameter of the brown dwarf Hill sphere. Our modelling shows that the presence of such a gap can initiate an additional minimum in the spectral energy distribution profile of a protoplanetary disc at lambda = 10-100 mum. We found that it is possible to detect signatures of the companion when it is located within 10 AU, even when it is as small as 3 M J. The spectral energy distribution of a protostellar disc with a massive fragment (of relatively cold temperature 400 K) might have a similar double peaked profile to the spectral energy distribution of a more evolved disc that contains a gap.
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