A Search for Close Binaries in the Rho Ophiuchus Star-Forming Region

Abstract

We have carried out a new, near-infrared speckle imaging survey of 19 members of the young stellar population in the nearby (d=140 pc), Rho Ophiuchi cloud core. Results for four binary and one newly discovered triple system are reported. Data for all known multiple systems among the pre-main-sequence population of Rho Oph are tabulated. We define a "restricted binary fraction", Fbr, and a "restricted companion fraction", Fcr, as counting only those systems most detectable in the present and previous high-resolution near-infrared imaging surveys, having separations between 0.1-1.1 arcsec and K-band magnitude differences, Delta K < 3. Analysis of all the available multiplicity data results in updated values of Fbr=Fcr=24%+/-11% for the Ophiuchus pre-main-sequence population. These values are consistent with the values in the Taurus star-forming region, and Fcr is in excess by a factor of 2 relative to the Main Sequence at the 1-sigma level.

arXiv comment21 pages, 6 figures, 4 tables

References in corpus (10)

• ISOCAM observations of the rho Ophiuchi cloud: Luminosity and mass functions of the pre-main sequence embedded cluster
• A Spectroscopic Survey of Subarcsecond Binaries in the Taurus-Auriga Dark Cloud with the Hubble Space Telescope
• Rotation and X-ray emission from protostars
• Quasi-periodic X-ray Flares from the Protostar YLW15
• HST/NICMOS Imaging Survey of the Ophiuchus (Lynds 1688) Cluster
• A Far-Infrared Survey of Molecular Cloud Cores
• An Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in the Rho Ophiuchi and Serpens Molecular Clouds
• Imaging the Circumstellar Environments of Young Binaries in Southern Star-Forming Regions
• A Luminous Infrared Companion in the Young Triple System WL 20
• Near Infrared Adaptive Optics Imaging of the Embedded Cluster NGC 2024

Cited by in corpus (35)

• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• High Resolution Submillimeter Constraints on Circumstellar Disk Structure
• Accretion in the Rho-Oph pre-main sequence stars
• Inverse dynamical population synthesis: Constraining the initial conditions of young stellar clusters by studying their binary populations
• The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
• Observations of T Tauri Disks at Sub-AU Radii: Implications for Magnetospheric Accretion and Planet Formation
• A Multiplicity Survey of the Rho Ophiuchi Molecular Clouds
• Multiple protostellar systems. I. A deep near infrared survey of Taurus and Ophiuchus protostellar objects
• The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
• On the properties of young multiple stars
• The Spitzer c2d Survey of Weak-Line T Tauri Stars. III. The Transition from Primordial Disks to Debris Disks
• Protoplanetary Disks in $\rho$ Ophiuchus as Seen From ALMA
• Silica in Protoplanetary Disks
• Mapping H-band Scattered Light Emission in the Mysterious SR21 Transitional Disk
• A Near-Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in Six Nearby Molecular Clouds
• A continuum of accretion burst behavior in young stars observed by K2
• The Initial Mass Function and Disk Frequency of the Rho Ophiuchi Cloud: An Extinction-Limited Sample
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• Dynamical Masses of Young Stars I: Discordant Model Ages of Upper Scorpius
• Mapping the shores of the brown dwarf desert. IV. Ophiuchus
• A Mid-Infrared Imaging Survey of Embedded Young Stellar Objects in the Rho Ophiuchi Cloud Core
• Long-term variability of T Tauri stars using WASP
• Spirals inside the millimeter cavity of transition disk SR 21
• VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects
• Magnetic fields of intermediate mass T Tauri stars
• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• Mid-Infrared Observations of Class I/Flat-Spectrum Systems in Six Nearby Molecular Clouds
• Orbital Motion of Young Binaries in Ophiuchus and Upper Centaurus-Lupus
• Stellar Flyby Analysis for Spiral Arm Hosts with Gaia DR3
• Proper motions of molecular hydrogen outflows in the Rho Ophiuchi molecular cloud
• A Spectroscopic Technique for Measuring Stellar Properties of Pre-Main Sequence Stars
• Interferometric study on the temporal variability of the brightness distributions of protoplanetary disks
• Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-Field Spectroscopy
• New Spatially Resolved Imaging of the SR 21 Transition Disk and Constraints on the Small-Grain Disk Geometry
• The Mid-Infrared Polarization of the Herbig Ae Star WL 16: An Interstellar Origin?