ucdmcmc models

It was last updated on 6 April 2026

If you use these models for your research, please site the original models listed below as well as the ucdmcmc model code, Burgasser et al. (2026):

@software{adam_burgasser_2026_18530144,
  author       = {Adam Burgasser and
                  Brooks, Hunter and
                  Morrissey, Sara J. and
                  Haynes, Julia and
                  Liou, Tiffany},
  title        = {aburgasser/ucdmcmc: v1.4.2},
  month        = feb,
  year         = 2026,
  publisher    = {Zenodo},
  version      = {v1.4.2},
  doi          = {10.5281/zenodo.18530144},
  url          = {https://doi.org/10.5281/zenodo.18530144},
}

Instructions

Individual Models

• Click on the link below for the model set you want
• Save to your ~/.ucdmcmc_models folder (this needs to be created or is made automatically when you first start ucdmcmc)

Full Model Set

• Download the file allmodels.tar.gz to your computer (Warning: 29 Gb)
• Unpack this gzip tarball and move the resulting *.h5 files to your ~/.ucdmcmc_models folder

You can test that this worked by importing the model into ucdmcmc:

# assume we downloaded the sand24 JWST-NIRSPEC-PRISM models
import ucdmcmc
models,wave = ucdmcmc.getModel(model='sand24',instrument='JWST-NIRSPEC-PRISM')

Wavelength arrays

• EUCLID: EUCLID NISP, covering 0.9-1.9 micron at a median resolution of 350, matched to observed data for EUCLID J0359-4740 from Dominguez-Tagle et al. (2025)
• FIRE-PRISM: Magellan FIRE Prism mode, covering 0.8-2.5 micron at a median resolution of 250, matched to observed data for Ross 458C from Burgasser et al. (2010)
• FIRE-ECHELLE: Magellan FIRE Echelle mode, covering 0.8-2.5 micron at a median resolution of 6000, matched to observed data for UGPS J0722-0540 from Bochanski et al. (2010)
• JWST-NIRSPEC-G395H: JWST NIRSPEC G395H mode, covering 2.8-5.2 micron at a median resolution of 2000 , matched to observed data for Wolf 113C from Burgasser et al. (2024)
• JWST-NIRSPEC-PRISM: JWST NIRSPEC Prism mode, covering 0.5--6 micron matched at a variable resolution of 30-300, matched to observed data for Wolf 113C from Burgasser et al. (2024)
• JWST-MIRI-LRS: JWST MIRI LRS mode, JWST MIRI LRS mode, covering 4.55--13.5 at a variable resolution of 40-160, matched to observed data for SDSS J1624+0029 from Beiler et al. (2024)
• JWST-NIRSPEC-MIRI: combination of NIRSPEC Prism and MIR LRS, covering 0.5-13.5 micron at a variable resolution of 30-300, matched to observed data for SDSS J1624+0029 from Beiler et al. (2024)
• NIR: custom low resolution NIR range, covering 0.85-2.4 micron at a fixed resolution of 300
• OIR: custom low resolution OIR range, covering 0.3-30 micron at a fixed resolution of 300
• ROMAN-GRISM: Nancy Grace Roman Space Telescope pre-flight grism (G150) dispersion measurement as reported in Bray et al. (2024).
• ROMAN-PRISM: Nancy Grace Roman Space Telescope pre-flight prism (P127) dispersion measurement as reported in Bray et al. (2024).
• SPEX-PRISM: IRTF SpeX Prism mode, covering 0.65-2.56 micron at a median resolution of 150, matched to observed data for 2MASS J0559-1404 from Burgasser et al. (2006)
• SPEX-SXD: IRTF SpeX SXD mode, covering 0.65-2.56 micron at a median resolution of 2000, matched to observed data for 2MASS J0559-1404 from Cushing et al. (2005)
• SPHEREX: SPHEREx combined spectrum, covering 0.75-5 micron at a median resolution of 50 matched to TBD sample (Gagne et al., in prep)
• STIS-SXD: custom template to match combination of HST/STIS and SpeX/SXD modes, covering 0.75-2.5 micron at a median resolution of 2000 matched to observed data for Wolf 1130A from Zhang et al. (in prep).
• XSHOOTER-NIR: VLT/X-Shooter NIR channel, covering 1-2.45 micron at a median resolution of 9600, matched to observed data for VVV J12564163-6202039 from Zhang et al. (2019)
• XSHOOTER-VIS: VLT/X-Shooter VIS channel, covering 0.57-1.01 micron at a median resolution of 13000, matched to observed data for VVV J12564163-6202039 from Zhang et al. (2019)

Individual Models