title: A major asymmetric dust trap in a transition disk.
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.
authors.affiliation: Leiden Observatory, Leiden University, Leiden, Netherlands. nmarel@strw.leidenuniv.nl
authors.forename: Nienke
authors.initials: N
authors.lastname: van der Marel
authors.forename: Ewine F
authors.initials: EF
authors.lastname: van Dishoeck
authors.forename: Simon
authors.initials: S
authors.lastname: Bruderer
authors.forename: Til
authors.initials: T
authors.lastname: Birnstiel
authors.forename: Paola
authors.initials: P
authors.lastname: Pinilla
authors.forename: Cornelis P
authors.initials: CP
authors.lastname: Dullemond
authors.forename: Tim A
authors.initials: TA
authors.lastname: van Kempen
authors.forename: Markus
authors.initials: M
authors.lastname: Schmalzl
authors.forename: Joanna M
authors.initials: JM
authors.lastname: Brown
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Herczeg
authors.forename: Geoffrey S
authors.initials: GS
authors.lastname: Mathews
authors.forename: Vincent
authors.initials: V
authors.lastname: Geers