A Naive Bayes Classifier for identifying Class II YSOs

Abstract

A naive Bayes classifier for identifying Class II YSOs has been constructed and applied to a region of the Northern Galactic Plane containing 8 million sources with good quality Gaia EDR3 parallaxes. The classifier uses the five features: Gaia $G$-band variability, WISE mid-infrared excess, UKIDSS and 2MASS near-infrared excess, IGAPS H$\alpha$ excess and overluminosity with respect to the main sequence. A list of candidate Class II YSOs is obtained by choosing a posterior threshold appropriate to the task at hand, balancing the competing demands of completeness and purity. At a threshold posterior greater than 0.5 our classifier identifies 6504 candidate Class II YSOs. At this threshold we find a false positive rate around 0.02 per cent and a true positive rate of approximately 87 per cent for identifying Class II YSOs. The ROC curve rises rapidly to almost one with an area under the curve around 0.998 or better, indicating the classifier is efficient at identifying candidate Class II YSOs. Our map of these candidates shows what are potentially three previously undiscovered clusters or associations. When comparing our results to published catalogues from other young star classifiers, we find between one quarter and three quarters of high probability candidates are unique to each classifier, telling us no single classifier is finding all young stars.

38 pages, 28 figures, 15 tables. Accepted for publication in MNRAS

References in corpus (47)

• Array Programming with NumPy
• The Gaia mission
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Dartmouth Stellar Evolution Database
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Gaia Early Data Release 3: The astrometric solution
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Gaia Early Data Release 3: Photometric content and validation
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• The UKIDSS Galactic Plane Survey
• Painting a portrait of the Galactic disc with its stellar clusters
• The WFCAM Science Archive
• Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
• Gaia Early Data Release 3 -- Catalogue validation
• Three-dimensional mapping of the local interstellar medium with composite data
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• Intrinsically Red Sources observed by Spitzer in the Galactic Mid-Plane
• A systematic survey for infrared star clusters with |b|<20deg using 2MASS
• 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
• A maximum likelihood method for fitting colour-magnitude diagrams
• The IPHAS Catalogue of Halpha Emission Line Sources in the Northern Galactic Plane
• SPICY: The Spitzer/IRAC Candidate YSO Catalog for the Inner Galactic Midplane
• Identification of Young Stellar Object candidates in the $Gaia$ DR2 x AllWISE catalogue with machine learning methods
• Model Atmospheres From Very Low Mass Stars to Brown Dwarfs
• Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2
• Stellar contents and star formation in the young open cluster Stock 8
• Determining the recurrence timescale of long-lasting YSO outbursts
• An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2
• The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables
• Pre-main-sequence isochrones -- III. The Cluster Collaboration isochrone server
• A Spitzer View of Mon OB1 East/NGC 2264
• Untangling the Galaxy III: Photometric Search for Pre-main Sequence Stars with Deep Learning
• Probabilistic classification of X-ray sources applied to Swift-XRT and XMM-Newton catalogs
• The low-mass population in the young cluster Stock 8: Stellar properties and Initial Mass Function
• Characterising the i-band variability of YSOs over six orders of magnitude in timescale
• The First Extensive Spectroscopic Study of Young Stars in the North America and Pelican Nebulae Region
• Star-forming sites IC 446 and IC 447: an outcome of end-dominated collapse of Monoceros R1 filament
• Spitzer, Near-Infrared, and Submillimeter Imaging of the Relatively Sparse Young Cluster, Lynds 988e
• Gaia Data Release 1: Validation of the photometry
• A Comparative Study of Long and Short GRBs. II. A Multi-wavelength Method to distinguish Type II (massive star) and Type I (compact star) GRBs
• A kinematic perspective on the formation process of the stellar groups in the Rosette Nebula
• A neural network-based methodology to select young stellar object candidates from IR surveys
• Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2
• AGB interlopers in YSO catalogues hunted out by NEOWISE
• The young star population of L1188
• CCD photometry and classification of stars in the North America and Pelican nebulae region. I. Moletai photometry

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