A CONCENTRATION OF CENTIMETER-SIZED GRAINS IN THE OPHIUCHUS IRS 48 DUST TRAP

ABSTRACT Azimuthally asymmetric dust distributions observed with the Atacama Large Millimeter/submillimeter Array (ALMA) in transition disks have been interpreted as dust traps. We present Very Large Array Ka band (34 GHz or 0.9 cm) and ALMA Cycle 2 Band 9 (680 GHz or 0.45 mm) observations at a 0 2...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2015-09, Vol.810 (1), p.1-5
Main Authors: Marel, N. van der, Pinilla, P., Tobin, J., Kempen, T. van, Andrews, S., Ricci, L., Birnstiel, T.
Format: Article
Language:English
Subjects:
Arrays
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
AXIAL SYMMETRY
CONCENTRATION RATIO
Continuums
Disks
Dust
Emission
GHZ RANGE
Grains
INDEXES
instabilities
MORPHOLOGY
Planet formation
planet-disk interactions
PLANETS
planets and satellites: formation
protoplanetary disks
PROTOPLANETS
RESOLUTION
SATELLITES
STARS
TRAPPING
TRAPS
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Summary:ABSTRACT Azimuthally asymmetric dust distributions observed with the Atacama Large Millimeter/submillimeter Array (ALMA) in transition disks have been interpreted as dust traps. We present Very Large Array Ka band (34 GHz or 0.9 cm) and ALMA Cycle 2 Band 9 (680 GHz or 0.45 mm) observations at a 0 2 resolution of the Oph IRS 48 disk, which suggest that larger particles could be more azimuthally concentrated than smaller dust grains, assuming an axisymmetric temperature field or optically thin 680 GHz emission. Fitting an intensity model to both data demonstrates that the azimuthal extent of the millimeter emission is 2.3 0.9 times as wide as the centimeter emission, marginally consistent with the particle trapping mechanism under the above assumptions. The 34 GHz continuum image also reveals evidence for ionized gas emission from the star. Both the morphology and the spectral index variations are consistent with an increase of large particles in the center of the trap, but uncertainties remain due to the continuum optical depth at 680 GHz. Particle trapping has been proposed in planet formation models to allow dust particles to grow beyond millimeter sizes in the outer regions of protoplanetary disks. The new observations in the Oph IRS 48 disk provide support for the dust trapping mechanism for centimeter-sized grains, although additional data are required for definitive confirmation.
ISSN:2041-8205
2041-8213
2041-8213
DOI:10.1088/2041-8205/810/1/L7