The $\rho$ Oph region revisited with Gaia EDR3

Abstract

Context. Young and embedded stellar populations are important probes of the star formation process. Paradoxically, we have a better census of nearby embedded young populations than the slightly more evolved optically visible young populations. The high accuracy measurements and all-sky coverage of Gaia data are about to change this situation. Aims. This work aims to construct the most complete sample to date of YSOs in the $\rho$ Oph region. Methods. We compile a catalog of 1114 Ophiuchus YSOs from the literature and crossmatch it with the Gaia EDR3, Gaia-ESO and APOGEE-2 surveys. We apply a multivariate classification algorithm to this catalog to identify new, co-moving population candidates. Results. We find 191 new high-fidelity YSO candidates in the Gaia EDR3 catalog belonging to the $\rho$ Oph region. The new sources appear to be mainly Class III M-stars and substellar objects and are less extincted than the known members. We find 28 previously unknown sources with disks. The analysis of the proper motion distribution of the entire sample reveals a well-defined bimodality, implying two distinct populations sharing a similar 3D volume. The first population comprises young stars' clusters around the $\rho$ Ophiuchi star and the main Ophiuchus clouds (L1688, L1689, L1709). In contrast, the second population is older ($\sim$ 10 Myr), dispersed, has a distinct proper motion, and is possibly from the Upper Sco group. The two populations are moving away from each other at about 4.1 km/s, and will no longer overlap in about 4 Myr. Finally, we flag 17 sources in the literature as impostors, which are sources that exhibit large deviations from the average distance and proper motion properties of the $\rho$ Oph population. Our results show the importance of accurate 3D space and motion information for improved stellar population analysis. (Abridged)

arXiv commentSubmitted to A&A on January 28th 2021. This is the second (revised) version of the paper. All comments welcome

References in corpus (41)

• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The SIMBAD astronomical database
• Local Kinematics and the Local Standard of Rest
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• Gaia Early Data Release 3: Photometric content and validation
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Young Stellar Objects in the Gould Belt
• Low-Mass Star Formation and the Initial Mass Function in the Rho Ophiuchi Cloud Core
• A Compendium of Distances to Molecular Clouds in the Star Formation Handbook
• A Classification Scheme for Young Stellar Objects Using the WIDE-FIELD INFRARED SURVEY EXPLORER AllWISE Catalog: Revealing Low-Density Star Formation in the Outer Galaxy
• The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
• Hipparcos distances of Ophiuchus and Lupus cloud complexes
• 3D shape of Orion A from Gaia DR2
• An Overview of the 2014 ALMA Long Baseline Campaign
• Extended stellar systems in the solar neighborhood -- V. Discovery of coronae of nearby star clusters
• Refining the Census of the Upper Scorpius Association with Gaia
• Extended stellar systems in the solar neighborhood - II. Discovery of a nearby 120° stellar stream in Gaia DR2
• Orion Revisited - I. The massive cluster in front of the Orion Nebula Cluster
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds: VII. Ophiuchus Observed with MIPS
• The Initial Mass Function and Disk Frequency of the Rho Ophiuchi Cloud: An Extinction-Limited Sample
• 3D dynamics of the Orion cloud complex -- Discovery of coherent radial gas motions at the 100-pc scale
• Orion revisited. II. The foreground population to Orion A
• The chemistry of disks around T Tauri and Herbig Ae/Be stars
• A census of $\rho$ Oph candidate members from Gaia DR2
• An Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in the Rho Ophiuchi and Serpens Molecular Clouds
• A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
• Stars that Move Together Were Born Together
• The Gaia-ESO Survey: Dynamical Analysis of the L1688 region in Ophiuchus
• Discovery of new stellar groups in the Orion complex
• Extended stellar systems in the solar neighborhood. IV. Meingast 1: the most massive stellar stream in the solar neighborhood
• Proper motion survey and kinematic analysis of the Rho Ophiuchi embedded cluster
• VISION - Vienna Survey in Orion II. Infrared extinction in Orion A
• New member candidates of Upper Scorpius from Gaia DR1
• The first stars of the Rho Ophiuchi Dark Cloud. XMM-Newton view of Rho Oph and its neighbors

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• The Gaia-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy
• The star formation history of the Sco-Cen association. Coherent star formation patterns in space and time
• A Census of the Stellar Populations in the Sco-Cen Complex
• Hunting for Neighboring Open Clusters with Gaia DR3: 101 New Open Clusters within 500 pc
• The star formation history of Upper Scorpius and Ophiuchus
• Significance Mode Analysis (SigMA) for hierarchical structures. An application to the Sco-Cen OB association
• The Gaia-ESO Survey: Target selection of open cluster stars
• Survey of Orion Disks with ALMA (SODA) I: Cloud-level demographics of 873 protoplanetary disks
• Determining Dust Properties in Protoplanetary Disks: SED-derived Masses and Settling With ALMA
• A Novel Method to Estimate the FUV Flux and a Catalogue for Star-Hosting Discs in Nearby Star-Forming Regions
• The physical properties of Cluster Chains
• Distributed YSOs in the Perseus Molecular Cloud from the Gaia and LAMOST Surveys
• Spectroscopy of Candidate Members of the Sco-Cen Complex
• The evolution of protoplanetary disc radii and disc masses in star-forming regions
• Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex
• HP2 Survey V. Ophiuchus: Filament formation in a dispersing cloud complex
• The accretion luminosity of Class I protostars
• Constraining the Stellar Masses and Origin of the Protostellar VLA 1623 System
• Toward the fabric of the Milky Way I. The density of disk streams from a local $250^3$ pc${}^3$ volume
• Keck Observations in the INfrared of Taurus and $\rho$ Oph Exoplanets And Ultracool dwarfs (KOINTREAU) II: Two Young Bound Companions to Ophiuchus Stars
• JWST Imaging of Edge-on Protoplanetary Disks. V. Flux Ratio Reversal and Disk-edge Structure in the Flying Saucer