Identification of Young Stellar Object candidates in the $Gaia$ DR2 x AllWISE catalogue with machine learning methods

Abstract

The second $Gaia$ Data Release (DR2) contains astrometric and photometric data for more than 1.6 billion objects with mean $Gaia$ $G$ magnitude $<$20.7, including many Young Stellar Objects (YSOs) in different evolutionary stages. In order to explore the YSO population of the Milky Way, we combined the $Gaia$ DR2 database with WISE and Planck measurements and made an all-sky probabilistic catalogue of YSOs using machine learning techniques, such as Support Vector Machines, Random Forests, or Neural Networks. Our input catalogue contains 103 million objects from the DR2xAllWISE cross-match table. We classified each object into four main classes: YSOs, extragalactic objects, main-sequence stars and evolved stars. At a 90% probability threshold we identified 1,129,295 YSO candidates. To demonstrate the quality and potential of our YSO catalogue, here we present two applications of it. (1) We explore the 3D structure of the Orion A star forming complex and show that the spatial distribution of the YSOs classified by our procedure is in agreement with recent results from the literature. (2) We use our catalogue to classify published $Gaia$ Science Alerts. As $Gaia$ measures the sources at multiple epochs, it can efficiently discover transient events, including sudden brightness changes of YSOs caused by dynamic processes of their circumstellar disk. However, in many cases the physical nature of the published alert sources are not known. A cross-check with our new catalogue shows that about 30% more of the published $Gaia$ alerts can most likely be attributed to YSO activity. The catalogue can be also useful to identify YSOs among future $Gaia$ alerts.

19 pages, 12 figures, 3 tables

References in corpus (28)

• The Gaia mission
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
• The Burst Mode of Protostellar Accretion
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Variable protostellar accretion with episodic bursts
• The Disk Population of the Chamaeleon I Star-Forming Region
• 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
• Spitzer observations of the Orion OB1 association: disk census in the low mass stars
• A Spitzer census of the IC 348 nebula
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. XI. Lupus Observed With IRAC and MIPS
• Clustered and Triggered Star Formation in W5: Observations with Spitzer
• A Combined Spitzer and Chandra Survey of Young Stellar Objects in the Serpens Cloud Core
• The Evolution of the Multiplicity of Embedded Protostars I: Sample Properties and Binary Detections
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds.X. The Chamaeleon II Pre-Main Sequence Population as Observed With IRAC and MIPS
• Gaia 17bpi: An FU Ori Type Outburst
• The Gould Belt Very Large Array Survey IV: The Taurus-Auriga complex
• Machine learning search for variable stars
• Gaia Data Release 1. Cross-match with external catalogues - Algorithm and results
• Machine-learning identification of galaxies in the WISExSuperCOSMOS all-sky catalogue
• HP2 survey: III The California Molecular Cloud--A Sleeping Giant Revisited
• A Spitzer View of Mon OB1 East/NGC 2264
• Extreme infrared variables from UKIDSS - II. an end-of-survey catalogue of eruptive YSOs and unusual stars
• The low-mass population in the young cluster Stock 8: Stellar properties and Initial Mass Function
• Automated novelty detection in the WISE survey with one-class support vector machines
• A Deep Spitzer Survey of Circumstellar Disks in the Young Double Cluster, h and chi Persei
• Spitzer, Near-Infrared, and Submillimeter Imaging of the Relatively Sparse Young Cluster, Lynds 988e

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• Image-based Classification of Variable Stars: First Results from Optical Gravitational Lensing Experiment Data
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