A Major Asymmetric Dust Trap in a Transition Disk

Nienke van der Marel (1); Ewine F. van Dishoeck (1,2); Simon Bruderer; (2); Til Birnstiel (3); Paola Pinilla (4); Cornelis P. Dullemond (4); Tim A.; van Kempen (1,5); Markus Schmalzl (1); Joanna M. Brown (3); Gregory J.; Herczeg (6); Geoffrey S. Mathews (1); Vincent Geers (7) ((1) Leiden; Observatory; (2) Max-Planck-Institut f\"ur Extraterrestrische Physik; (3); Harvard-Smithsonian Center for Astrophysics; (4) Heidelberg University,; Institute for Theoretical Astrophysics (5) Joint ALMA Offices; (6) Kavli; Institute for Astronomy; Astrophysics; (7) Dublin Institute for Advanced; Studies)

arXiv:1306.1768·astro-ph.EP·June 10, 2013

A Major Asymmetric Dust Trap in a Transition Disk

Nienke van der Marel (1), Ewine F. van Dishoeck (1,2), Simon Bruderer, (2), Til Birnstiel (3), Paola Pinilla (4), Cornelis P. Dullemond (4), Tim A., van Kempen (1,5), Markus Schmalzl (1), Joanna M. Brown (3), Gregory J., Herczeg (6), Geoffrey S. Mathews (1)

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TL;DR

This paper reports the detection of a significant asymmetric dust trap in a transition disk around star Oph IRS 48, using ALMA observations, which may explain how dust particles overcome inward drift during planet formation.

Contribution

First detection of a vortex-shaped dust trap in a transition disk, providing observational evidence for dust trapping mechanisms in planet formation.

Findings

01

High-contrast crescent-shaped dust emission detected

02

Big grains concentrated in a vortex-shaped trap

03

Gas and small grains show different spatial distributions

Abstract

The statistics of discovered exoplanets suggest that planets form efficiently. However, there are fundamental unsolved problems, such as excessive inward drift of particles in protoplanetary disks during planet formation. Recent theories invoke dust traps to overcome this problem. We report the detection of a dust trap in the disk around the star Oph IRS 48 using observations from the Atacama Large Millimeter/submillimeter Array (ALMA). The 0.44-millimeter-wavelength continuum map shows high-contrast crescent-shaped emission on one side of the star originating from millimeter-sized grains, whereas both the mid-infrared image (micrometer-sized dust) and the gas traced by the carbon monoxide 6-5 rotational line suggest rings centered on the star. The difference in distribution of big grains versus small grains/gas can be modeled with a vortex-shaped dust trap triggered by a companion.

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