Data di Pubblicazione:
2017
Citazione:
On the Origin of the Spiral Morphology in the Elias 2-27 Circumstellar Disk / F. Meru, A. Juh??sz, J.D. Ilee, C.J. Clarke, G.P. Rosotti, R.A. Booth. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 839:2(2017), pp. L24.1-L24.6. [10.3847/2041-8213/aa6837]
Abstract:
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
hydrodynamics; planet-disk interactions; protoplanetary disks; radiative transfer; stars: individual (Elias 2-27); stars: pre-main sequence
Elenco autori:
F. Meru, A. Juh??sz, J.D. Ilee, C.J. Clarke, G.P. Rosotti, R.A. Booth
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