no code implementations • 12 May 2023 • Anna Lueber, Daniel Kitzmann, Chloe E. Fisher, Brendan P. Bowler, Adam J. Burgasser, Mark Marley, Kevin Heng
Understanding differences between sub-stellar spectral data and models has proven to be a major challenge, especially for self-consistent model grids that are necessary for a thorough investigation of brown dwarf atmospheres.
2 code implementations • 18 Sep 2018 • Chloe Fisher, Kevin Heng
A comprehensive analysis of 38 previously published Wide Field Camera 3 (WFC3) transmission spectra is performed using a hierarchy of nested-sampling retrievals: with versus without clouds, grey versus non-grey clouds, isothermal versus non-isothermal transit chords and with water, hydrogen cyanide and/or ammonia.
Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Data Analysis, Statistics and Probability
1 code implementation • 11 Jun 2018 • Pablo Marquez-Neila, Chloe Fisher, Raphael Sznitman, Kevin Heng
Machine learning has previously been used to determine which molecules to include in the model, but the retrieval itself was still performed using standard methods.
Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Data Analysis, Statistics and Probability
no code implementations • 7 Feb 2017 • Kevin Heng, Daniel Kitzmann
Second, we show that the transmission spectra of isothermal atmospheres are nearly isobaric.
Earth and Planetary Astrophysics Atmospheric and Oceanic Physics
2 code implementations • 1 Jul 2016 • Shang-Min Tsai, James R. Lyons, Luc Grosheintz, Paul B. Rimmer, Daniel Kitzmann, Kevin Heng
It is constructed for gaseous chemistry from 500 to 2500 K using a reduced C-H-O chemical network with about 300 reactions.
Earth and Planetary Astrophysics