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Title:
The Influence of Forming Companions on the Spectral Energy Distributions of Stars with Circumstellar Discs
Authors:
Zakhozhay, Olga V.
Affiliation:
AA(Main Astronomical Observatory, National Academy of Sciences of Ukraine, Kyiv, 03143, Ukraine)
Publication:
Publications of the Astronomical Society of Australia, Volume 34, id.e015 9 pp. (PASA Homepage)
Publication Date:
04/2017
Origin:
CUP
Astronomy Keywords:
planet-disc interactions, planets and satellites: formation, planetary systems, protoplanetary disks
Abstract Copyright:
2017: Astronomical Society of Australia
DOI:
10.1017/pasa.2017.9
Bibliographic Code:
2017PASA...34...15Z

Abstract

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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