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.
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]
On the Origin of the Spiral Morphology in the Elias 2-27 Circumstellar Disk
G.P. RosottiPenultimo
;
2017
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.File | Dimensione | Formato | |
---|---|---|---|
1703.05338.pdf
accesso aperto
Tipologia:
Pre-print (manoscritto inviato all'editore)
Dimensione
2.85 MB
Formato
Adobe PDF
|
2.85 MB | Adobe PDF | Visualizza/Apri |
Meru_2017_ApJL_839_L24.pdf
accesso aperto
Tipologia:
Publisher's version/PDF
Dimensione
990.26 kB
Formato
Adobe PDF
|
990.26 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.