GAIA Arguments for and against a Hypothetical Sun Companion

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The hypothesis that the Sun is a component of a binary star system has been around for about a hundred years. Assumptions about the nature of the companion continue to be published as new observational data become available. The paper shows that the results of the work of the Gaia space observatory impose certain restrictions on the nature and location of the companion. The fact that the companion is not registered by the observatory leaves the following marginal possibilities: a cool brown dwarf (Y3 and later) in an orbit inside the Oort cloud, or an L/T brown dwarf in a higher orbit (from a≈ 105 AU). At the same time, the companion is quite likely cataloged in the 2MASS and WISE surveys. We also provided estimates for the absolute G-magnitudes of brown dwarfs of late spectral types.

作者简介

O. Malkov

Institute of Astronomy, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: malkov@inasan.ru
119017, Moscow, Russia

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