The effect of the streaming instability on protoplanetary disc emission at millimetre wavelengths
File(s)
Published version
OA Location
Author(s)
Scardoni, Chiara E
Booth, Richard A
Clarke, Cathie J
Type
Journal Article
Abstract
In this paper, we investigate whether overdensity formation via streaming instability is consistent with recent multiwavelength Atacama Large Millimeter Array (ALMA) observations in the Lupus star-forming region. We simulate the local action of streaming instability in 2D using the code ATHENA, and examine the radiative properties at mm wavelengths of the resulting clumpy dust distribution by focusing on two observable quantities: the optically thick fraction ff (in ALMA band 6) and the spectral index α (in bands 3–7). By comparing the simulated distribution in the ff–α plane before and after the action of streaming instability, we observe that clump formation causes ff to drop, because of the suppression of emission from grains that end up in optically thick clumps. α, instead, can either increase or decline after the action of streaming instability; we use a simple toy model to demonstrate that this behaviour depends on the sizes of the grains whose emission is suppressed by being incorporated in optically thick clumps. In particular, the sign of evolution of α depends on whether grains near the opacity maximum at a few tenths of a mm end up in clumps. By comparing the simulation distributions before/after clump formation to the data distribution, we note that the action of streaming instability drives simulations towards the area of the plane where the data are located. We furthermore demonstrate that this behaviour is replicated in integrated disc models provided that the instability is operative over a region of the disc that contributes significantly to the total mm flux.
Date Issued
2021-06-01
Date Acceptance
2021-03-19
Citation
Monthly Notices of the Royal Astronomical Society, 2021, 504 (1), pp.1495-1510
ISSN
0035-8711
Publisher
Royal Astronomical Society
Start Page
1495
End Page
1510
Journal / Book Title
Monthly Notices of the Royal Astronomical Society
Volume
504
Issue
1
Copyright Statement
© 2021 The Author(s)
Published by Oxford University Press on behalf of Royal Astronomical Society
Published by Oxford University Press on behalf of Royal Astronomical Society
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000656137100107&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
accretion, accretion discs
hydrodynamics
instabilities
planets and satellites: formation
protoplanetary discs
circumstellar matter
PLANETESIMAL FORMATION
TURBULENCE DRIVEN
ALMA SURVEY
DUST
SUBSTRUCTURES
RUNAWAY
GROWTH
COAGULATION
SOLAR
Publication Status
Published
Date Publish Online
2021-03-25