Survey of Orion Disks with ALMA (SODA) III: Disks in wide binary systems in L1641 and L1647

TL;DR

This study uses ALMA and other telescopes to analyze the properties of disks in wide binary systems within the Orion A region, revealing how stellar multiplicity influences disk evolution and potential planet formation.

Contribution

It provides the largest catalog of wide binary systems in Orion and offers a detailed statistical analysis of disk properties in these systems, advancing understanding of multiplicity effects.

Findings

Identified 65 multiple systems with separations >1000 AU.

Median dust mass of primary disks is approximately 3.2 Earth masses.

Secondary disks have a median dust mass of about 3.9 Earth masses.

Abstract

Aims. The goal of this work is to comprehensively characterize the impact of stellar multiplicity on Class II disks in the L1641 and L1647 regions of Orion A (~1-3 Myr), part of the Survey of Orion Disks with ALMA (SODA). We characterize the protostellar multiplicity using the Atacama Large Millimeter/submillimeter Array (ALMA), the ESO-VISTA, and Hubble Space telescopes. The resulting sample of 65 multiple systems represents the largest catalogue of wide binary systems to date (projected separation >1000 AU), allowing a more robust statistical characterization of the evolution and properties of protoplanetary disks. Methods. The disk population was observed in continuum with ALMA at 225 GHz, with a median rms of 1.5 Mearth. Combining these data (resolution ~1.1arcsec ) with the ESO-VISTA near-infrared survey of the Orion A cloud (resolution ~0.7arcsec ), multiple systems are assembled and selected by an iterative inside-out search in projected separation (>1000 AU). Results. We identify 61 binary systems, 3 triple systems, and one quadruple system. The separation range is between 1000 and 10^4 AU. The dust mass distributions inferred with the Kaplan-Meier estimator yield a median mass of 3.23+0.6-0.4 Mearth for primary disks and 3.88+0.3-0.3 Mearth for secondary disks.