On the Origin of the Spiral Morphology in the Elias 2-27 Circumstellar Disk

被引：69

作者：

Meru, Farzana ^{[1
]}

Juhasz, Attila ^{[1
]}

Ilee, John D. ^{[1
]}

Clarke, Cathie J. ^{[1
]}

Rosotti, Giovanni P. ^{[1
]}

Booth, Richard A. ^{[1
]}

机构：

[1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 839卷 / 02期

关键词：

hydrodynamics; planet-disk interactions; protoplanetary disks; radiative transfer; stars: individual (Elias 2-27); stars: pre-main sequence; SMOOTHED PARTICLE HYDRODYNAMICS; LOW-MASS STARS; PROTOPLANETARY DISKS; RADIATIVE-TRANSFER; GAP; ACCRETION; CLOUD; FRAGMENTATION; EVOLUTION; PLANETS;

D O I：

10.3847/2041-8213/aa6837

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The young star Elias 2-27 has recently been observed to posses a massive circumstellar disk with two prominent large-scale spiral arms. In this Letter, we perform three-dimensional Smoothed Particle Hydrodynamics simulations, radiative transfer modeling, synthetic ALMA imaging, and an unsharped masking technique to explore three possibilities for the origin of the observed structures-an undetected companion either internal or external to the spirals, and a self-gravitating disk. We find that a gravitationally unstable disk and a disk with an external companion can produce morphology that is consistent with the observations. In addition, for the latter, we find that the companion could be a relatively massive planetary-mass companion (less than or similar to 10-13MJup) and located at large radial distances (between approximate to 300-700 au). We therefore suggest that Elias 2-27 may be one of the first detections of a disk undergoing gravitational instabilities, or a disk that has recently undergone fragmentation to produce a massive companion.

引用

页数：6

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