Jupiter mass binaries and cosmic ray viscosity

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
J. I. Katz
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引用次数: 0

Abstract

The fraction of planetary mass objects in the Trapezium cluster that are in wide binaries is much greater than implied by extrapolation to lower masses of the fraction of stars that are wide binaries. Wide binaries may be produced by gravitational collapse of a medium with fluid vorticity. In a uniform medium with uniform vorticity the collapse criterion is independent of the size and mass of the collapsing region, which would imply a wide binary fraction independent of mass, in contradiction to observation. Angular momentum, rather than thermal pressure, may be the chief obstacle to star formation. The excess of Jupiter Mass Binary Objects in the Trapezium cluster may be attributed to cosmic ray viscosity that transports angular momentum to surrounding material. Viscosity is more effective in smaller and less massive collapsing regions, preferentially producing planetary mass wide binaries.

木星质量双星和宇宙射线粘度
梯形星团中行星质量天体中宽双星的比例远远大于对低质量恒星中宽双星比例的推断。宽双星可能是由具有流体涡度的介质的引力坍缩产生的。在具有均匀涡度的均匀介质中,坍缩标准与坍缩区域的大小和质量无关,这意味着宽双星的比例与质量无关,这与观测结果相矛盾。恒星形成的主要障碍可能是角动量,而不是热压。梯形星团中木星质量双星过多可能是由于宇宙射线的粘性将角动量传递给了周围的物质。在较小、质量较小的坍缩区域,粘度更有效,更容易产生行星质量宽双星。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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