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Measured properties of young stellar objects (YSOs) are key tools forresearch into pre-main-sequence stellar evolution. YSO properties are commonlymeasured by comparing observed radiation to existing grids of template YSOspectral energy distributions (SEDs) calculated by radiative transfer. Thesegrids are often sampled and constructed using simple models of massassembly/accretion over time. However, because we do not yet have a completetheory of star formation, the choice of model sets the tracked parameters andrange of allowed values. By construction, then, the assumed model limits themeasurements that can be made using the grid. Radiative transfer models notconstrained by specific accretion histories would enable assessment of a widerrange of theories. We present an updated version of the Robitaille (2017) setof YSO SEDs, a collection of models with no assumed evolutionary theory. Weoutline our newly calculated properties: envelope mass, weighted-average dusttemperature, disk stability, and circumstellar $A_{\rm V}$. We also convolvethe SEDs with new filters, including JWST, and provide users the ability toperform additional convolutions. We find a correlation between the averagetemperature and millimeter-wavelength brightness of optically thin dust in ourmodels and discuss its ramifications for mass measurements of pre- andprotostellar cores. We also compare the positions of YSOs of differentobservational classes and evolutionary stages in IR color space and use ourmodels to quantify the extent to which class and stage may be confused due toobservational effects. Our updated models are released to the public.

An updated modular set of synthetic spectral energy distributions for young stellar objects