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Models are available for download at ATMO 2020.

The ATMO 2020 Model Spectra here are part of the atmosphere and evolutionary models for cool T-Y brown dwarfs and giant exoplanets in radiative-convective equilibrium. The original models have wavelength in units of \(\mu m \) and fluxes  in units of  \(Watts \ m^{-2} \mu m^{-1}\). Our models were converted to wavelength in units in \(\dot{A}\)and fluxes in units of \(erg\ s^{-1}cm^{-2}A^{-1}.\)

Although the authors offer models for several log (g) values, here we limit the set to the models with log(g) = 5.0. These models are generated using solar metallicity and with a temperature range between 200 K to 2000 K, as recommended by the authors.

Table 1 provides the full list of models offered via MAST HLSP (ATMO 2020).

Table 1: ATMO 2020 Atmosphere Models
Filename Temp (K) log (g)
spec_t200_lg5.0_ceq.fits 200 5.0
spec_t250_lg5.0_ceq.fits 250 5.0
spec_t300_lg5.0_ceq.fits 300 5.0
spec_t350_lg5.0_ceq.fits 350 5.0
spec_t400_lg5.0_ceq.fits 400 5.0
spec_t450_lg5.0_ceq.fits 450 5.0
spec_t500_lg5.0_ceq.fits 500 5.0
spec_t550_lg5.0_ceq.fits 550 5.0
spec_t600_lg5.0_ceq.fits 600 5.0
spec_t700_lg5.0_ceq.fits 700 5.0
spec_t800_lg5.0_ceq.fits 800 5.0
spec_t900_lg5.0_ceq.fits 900 5.0
spec_t1000_lg5.0_ceq.fits 1000 5.0
spec_t1100_lg5.0_ceq.fits 1100 5.0
spec_t1200_lg5.0_ceq.fits 1200 5.0
spec_t1300_lg5.0_ceq.fits 1300 5.0
spec_t1400_lg5.0_ceq.fits 1400 5.0
spec_t1500_lg5.0_ceq.fits 1500 5.0
spec_t1600_lg5.0_ceq.fits 1600 5.0
spec_t1700_lg5.0_ceq.fits 1700 5.0
spec_t1800_lg5.0_ceq.fits 1800 5.0
spec_t1900_lg5.0_ceq.fits 1900 5.0
spec_t2000_lg5.0_ceq.fits 2000 5.0

 

References

Appendix

Below is an example of a standard header file for the ATMO model spec_t1800_lg5.0_ceq.fits. This model corresponds to a star with Teff = 1800 K and log (g) = 5.0.  It and covers a range in wavelength of

SIMPLE  =                    T / conforms to FITS standard                      
BITPIX  =                    8 / array data type                                
NAXIS   =                    0 / number of array dimensions                     
EXTEND  =                    T                                                  
DBTABLE = 'CRGRID  '                                                            
CONTACT = 'JWST ETCWG'                                                          
CREATED = 'June 29 2020'                                                        
DESCRIPT= 'ATMO2020 model spec_t200_lg5.0_ceq'                                  
LITREF  = 'M.W. Phillips et al. 2020, A&A 637, A38'                             
HISTORY File created by Glenn Wahlgren                                          
HISTORY ATMO 2020 model spectrum in radiative-convective equilibrium            
HISTORY for cool T-Y brown dwarfs and giant exoplanets.              
                    


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