Browsing by Author "Freedman, Richard"

Now showing items 1-6 of 6

    • Cloud busting: enstatite and quartz clouds in the atmosphere of 2M2224-0158 

      Burningham, Ben; Faherty, Jacqueline K.; Gonzales, Eileen C.; Marley, Mark S.; Visscher, Channon; Lupu, Roxana; Gaarn, Joesphine; Bieger, Michelle Fabienne; Freedman, Richard; Saumon, Didier (2021-05-18)
      We present the most detailed data-driven exploration of cloud opacity in a substellar object to-date. We have tested over 60 combinations of cloud composition and structure, particle size distribution, scattering model, ...

    • The first retrieval of a substellar subdwarf: A cloud-free SDSS J125637.13-022452.4 

      Gonzales, Eileen C.; Burningham, Ben; Faherty, Jacqueline K.; Visscher, Channon; Marley, Mark S.; Lupu, Roxana; Freedman, Richard; Lewis, Nikole K. (2021-12-08)
      We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13-022452.4 (SDSS J1256-0224), using the Brewster retrieval code base. We find SDSS J1256-0224 is best fit by a cloud-free model with an ion ...

    • The puzzle of the formation of T8 dwarf Ross 458c 

      Gaarn, Josefine; Burningham, Ben; Faherty, Jacqueline K.; Visscher, Channon; Marley, Mark S.; Gonzales, Eileen C.; Calamari, Emily; Gagliuffi, Daniella Bardalez; Lupu, Roxana; Freedman, Richard (2023-06-01)
      At the lowest masses, the distinction between brown dwarfs and giant exoplanets is often blurred and literature classifications rarely reflect the deuterium burning boundary. Atmospheric characterization may reveal the ...

    • Retrieval of atmospheric properties of cloudy L dwarfs 

      Burningham, Ben; Marley, Mark S.; Line, Michael R.; Lupu, Roxana; Visscher, Channon; Morley, Caroline V.; Saumon, Didier; Freedman, Richard (2017-09-01)
      We present the first results from applying the spectral inversion technique in the cloudy L dwarf regime. Our new framework provides a flexible approach to modelling cloud opacity which can be built incrementally as the ...

    • Retrieval of SDSS J1416+1348AB 

      Gonzales, Eileen; Burningham, Ben; Faherty, Jackie; Cleary, Colleen; Visscher, Channon; Marley, Mark; Lupu, Roxana; Freedman, Richard (2020-12-10)
      We present the distance-calibrated spectral energy distribution (SED) of the d/sdL7 SDSS J14162408+1348263A (J1416A) and an updated SED for SDSS J14162408+1348263B (J1416B). We also present the first retrieval analysis of ...

    • Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs II : Properties of 11 T-dwarfs 

      Line, Michael R.; Marley, Mark S.; Liu, Michael C.; Burningham, Ben; Morley, Caroline V.; Hinkel, Natalie R.; Teske, Johanna; Fortney, Jonathan J.; Lupu, Roxana; Freedman, Richard (2017-10-20)
      Brown dwarf spectra are rich in information revealing of the chemical and physical processes operating in their atmospheres. We apply a recently developed atmospheric retrieval tool to an ensemble of late T-dwarf (600-800K) ...