A framework for modeling the evolution of young stellar objects

Abstract

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 radiative-transfer model YSO spectral energy distributions (SEDs). Due to uncertainty on the precise mechanics of star formation, the properties inferred for YSOs using these models often depend strongly on the assumed accretion history. We develop a framework for predicting observable properties of YSOs that is agnostic to the underlying accretion history, enabling comparison between theories. This framework links a set of radiative-transfer SEDs with protostellar evolutionary tracks to create models of evolving YSOs. Unlike previous works, we directly relate evolution models to observables through theoretical physical parameters rather than through intermediate, observationally derived analogues. We make flux predictions for YSOs corresponding to stars with birth masses from 0.2 to 50 $M_{\odot }$ during their accretion phase following isothermal-sphere, turbulent-core, and competitive accretion histories, showing that these histories may be observationally distinguished by examining the 100-$\mu$m and 3-mm fluxes of a YSO. We discuss the impact of dust models and parameter ranges on the output of radiative transfer simulations through a comparison to another SED model grid. We quantify the degree of confusion between YSO Stages and Classes across a wide range of physical scenarios; for each, we calculate confusion matrices that enable inference of the number of objects of a given Stage from an observed population. Finally, we critically examine the physical significance of various literature Stage and Class definitions.

36 pages, 18 figures, 1 table. Includes appendix: 6 pages, 5 figures. To be published in ApJ. Confusion matrices available at https://doi.org/10.5281/zenodo.13922040

References in corpus (57)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Star Formation in the Milky Way and Nearby Galaxies
• Disk Frequencies and Lifetimes in Young Clusters
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• The Formation of Massive Stars from Turbulent Cores
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• Competitive accretion in embedded stellar cluster
• Spitzer Space Telescope study of disks in the young $\sigma$ Orionis cluster
• 2-D Radiative Transfer in Protostellar Envelopes: I. Effects of Geometry on Class I Sources
• The mass function of dense molecular cores and the origin of the IMF
• 2-D Radiative Transfer in Protostellar Envelopes: II. An Evolutionary Sequence
• Evolution of Massive Protostars with High Accretion Rates
• Scattering by Interstellar Dust Grains. II. X-Rays
• Massive star formation in 100,000 years from turbulent and pressurized molecular clouds
• The Effects of Radiative Transfer on Low-Mass Star Formation
• Evolution of Massive Protostars via Disk Accretion
• The Herschel Orion Protostar Survey: Spectral Energy Distributions and Fits Using a Grid of Protostellar Models
• HYPERION: An open-source parallelized three-dimensional dust continuum radiative transfer code
• The Birth of High Mass Stars: Accretion and/or Mergers?
• The Formation of the First Stars I. Mass Infall Rates, Accretion Disk Structure and Protostellar Evolution
• A SCUBA survey of Orion, the low-mass end of the core mass function
• Resolving the Luminosity Problem in Low-Mass Star Formation
• Evolutionary Signatures in the Formation of Low-Mass Protostars. II. Towards Reconciling Models and Observations
• A Herschel and APEX Census of the Reddest Sources in Orion: Searching for the Youngest Protostars
• The Spectral Energy Distribution of HH30 IRS: Constraining The Circumstellar Dust Size Distribution
• Evolutionary Signatures in the Formation of Low-Mass Protostars
• Electron-Ion Recombination on Grains and Polycyclic Aromatic Hydrocarbons
• Three-Dimensional Radiation Transfer in Young Stellar Objects
• CO outflows from high-mass Class 0 protostars in Cygnus-X
• The Protostellar Luminosity Function
• Characterizing the nature of embedded young stellar objects through silicate, ice and millimeter observations
• The FRIED grid of mass loss rates for externally irradiated protoplanetary discs
• A modular set of synthetic spectral energy distributions for young stellar objects
• The Luminosities of Protostars in the Spitzer c2d and Gould Belt Legacy Clouds
• High-resolution Near-Infrared Images and Models of the Circumstellar Disk in HH 30
• The young population of the Chamaeleon II dark cloud
• The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution
• A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey
• The Evolution of Protostars: Insights from Ten Years of Infrared Surveys with Spitzer and Herschel
• Radiation Transfer of Models of Massive Star Formation. I. Dependence on Basic Core Properties
• Radiation Transfer of Models of Massive Star Formation. IV. The Model Grid and Spectral Energy Distribution Fitting
• The Protostellar Mass Function
• Radiation Transfer of Models of Massive Star Formation. II. Effects of the Outflow
• ALMA-IMF II -- investigating the origin of stellar masses: Continuum Images and Data Processing
• ALMA-IMF XV: The core mass function in the high-mass star-formation regime
• Simulating protostellar evolution and radiative feedback in the cluster environment
• Extension of HOPS Out to 500 ParSecs (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds
• Small Protoplanetary Disks in the Orion Nebula Cluster and OMC1 with ALMA
• 300: An ACA 870 $\mu$m Continuum Survey of Orion Protostars and their Evolution
• Near-infrared spectroscopic observations of massive young stellar object candidates in the Central Molecular Zone
• An updated modular set of synthetic spectral energy distributions for young stellar objects