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Classification of young stellar objects (YSOs) into different evolutionary stages helps us to understand the formation process of new stars and planetary systems. Such classification has traditionally been based on spectral energy…

Astrophysics of Galaxies · Physics 2018-09-05 Oskari Miettinen

In this paper, I present a new set of synthetic spectral energy distributions (SEDs) for young stellar objects (YSOs) spanning a wide range of evolutionary stages, from the youngest deeply embedded protostars to pre-main-sequence stars with…

Solar and Stellar Astrophysics · Physics 2017-03-29 Thomas P. Robitaille

The past decade has seen a rise in the use of Machine Learning methods in the study of young stellar evolution. This trend has led to a growing need for a comprehensive database of young stellar objects (YSO) that goes beyond…

Solar and Stellar Astrophysics · Physics 2025-10-08 J. Roquette , M. Audard , D. Hernandez , I. Gezer , G. Marton , C. Mas , M. Madarász , O. Dionatos

Young exoplanets and their corresponding host stars are fascinating laboratories for constraining the timescale of planetary evolution and planet-star interactions. However, because young stars are typically much more active than the older…

Earth and Planetary Astrophysics · Physics 2022-02-02 Matthew P. Battley , David J. Armstrong , Don Pollacco

Measuring properties of young stellar objects (YSOs) is necessary for probing the pre-main-sequence evolution of stars. As YSOs exhibit complex geometry, measurement generally entails comparing observed radiation to template populations of…

Solar and Stellar Astrophysics · Physics 2025-07-24 Theo Richardson , Adam Ginsburg , Erik Rosolowsky , Joshua Peltonen , Rémy Indebetouw

Accurate measurements of statistical properties, such as the star formation rate and the lifetime of young stellar objects (YSOs) in different stages, is essential for constraining star formation theories. However, it is a difficult task to…

Solar and Stellar Astrophysics · Physics 2021-05-04 Yi-Lung Chiu , Chi-Ting Ho , Daw-Wei Wang , Shih-Ping Lai

Young massive stars influence their surroundings from local to galactic scales, but the observational challenges associated with their distance and embedded nature has, until the recent decade, made high-resolution studies of these objects…

Solar and Stellar Astrophysics · Physics 2021-10-27 A. J. Frost , R. D. Oudmaijer , S. L. Lumsden , W-J de Wit

Measured properties of young stellar objects (YSOs) are key tools for research into pre-main-sequence stellar evolution. YSO properties are commonly measured by comparing observed radiation to existing grids of template YSO spectral energy…

Solar and Stellar Astrophysics · Physics 2024-01-26 Theo Richardson , Adam Ginsburg , Rémy Indebetouw , Thomas P. Robitaille

We performed a large-scale spectral energy distribution (SED) fitting analysis for young stellar objects (YSOs) in the Orion star formation complex (OSFC) to derive key physical parameters; temperature, luminosity, mass, and age, using SED…

Solar and Stellar Astrophysics · Physics 2025-02-27 Ilknur Gezer , Gábor Marton , Julia Roquette , Marc Audard , David Hernandez , Máté Madarász , Odysseas Dionatos

Near-infrared imaging surveys of high-mass star-forming regions reveal an amazingly complex interplay between star formation and the environment (Churchwell et al. 2006; Alvarez et al. 2004). By means of near-IR spectroscopy the embedded…

(abridged) Star formation in the outer Galaxy, i.e., outside of the Solar circle, has been lightly studied in part due to low CO brightness of molecular clouds linked with the negative metallicity gradient. Recent infrared surveys provide…

We present a method to analyze the spectral energy distributions (SEDs) of young stellar objects (YSOs). Our approach is to fit data with pre-computed 2-D radiation transfer models spanning a large region of parameter space. This allows us…

Astrophysics · Physics 2010-04-06 Thomas P. Robitaille , Barbara A. Whitney , Remy Indebetouw , Kenneth Wood

We develop a new method to identify YSOs from star-forming regions using the photometry data from Spitzer's c2d Legacy Project. The aim is to obtain YSO lists as complete as possible for studying the statistical properties, such as Star…

Astrophysics of Galaxies · Physics 2015-06-12 Tien-Hao Hsieh , Shih-Ping Lai

We present a grid of radiation transfer models of axisymmetric young stellar objects (YSOs), covering a wide range of stellar masses (from 0.1Msun to 50Msun) and evolutionary stages (from the early envelope infall stage to the late…

OB associations are home to newly formed massive stars, whose turbulent winds and ionizing flux create H II regions rich with star formation. Studying the distribution and abundance of young stellar objects (YSOs) in these ionized bubbles…

Solar and Stellar Astrophysics · Physics 2021-11-17 Abby Mintz , Joseph L. Hora , Elaine Winston

We examine a general framework for visualizing datasets of high (> 2) dimensionality, and demonstrate it using the morphology of galaxies at moderate redshifts. The distributions of various populations of such galaxies are examined in a…

Astrophysics · Physics 2007-05-23 A. Naim , K. U. Ratnatunga , R. E. Griffiths

Detailed radial/vertical structure modeling of observations of disks around Young Stellar Objects (YSOs) can provide information on the physical conditions and on the characteristics of the gas and dust in their interiors. We describe…

Astrophysics · Physics 2007-05-23 Nuria Calvet , Paola D'Alessio

The growing volume of data produced by large astronomical surveys necessitates the development of efficient analysis techniques capable of effectively managing high-dimensional datasets. This study addresses this need by demonstrating some…

When studying the evolutionary stages of protostars that form in clusters, the role of any intracluster medium cannot be neglected. High foreground extinction can lead to situations where young stellar objects (YSOs) appear to be in earlier…

We use multi-band optical and near-infrared photometric observations of galaxies in the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS) to predict photometric redshifts using artificial neural networks. The…

Astrophysics of Galaxies · Physics 2020-01-15 Derek Wilson , Hooshang Nayyeri , Asantha Cooray , Boris Häußler
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