Autodifferentiable Spectrum Model for High-dispersion Characterization of Exoplanets and Brown Dwarfs

Kawahara, Hajime; Kawashima, Yui; Masuda, Kento; Crossfield, Ian M.; Pannier, Erwan; van den Bekerom, Dirk

doi:10.3847/1538-4365/ac3b4d

Autodifferentiable Spectrum Model for High-dispersion Characterization of Exoplanets and Brown Dwarfs

Journal Article · Sun Jan 30 23:00:00 EST 2022 · The Astrophysical Journal. Supplement Series

DOI:https://doi.org/10.3847/1538-4365/ac3b4d· OSTI ID:1845396

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Univ. of Tokyo (Japan)
Ripken Cluster for Pioneering Research (CPR), Wako (Japan)
Osaka Univ. (Japan)
Univ. of Kansas, Lawrence, KS (United States)
Univ. Paris-Saclay, Gif-sur-Yvette (France)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

We present an autodifferentiable spectral modeling of exoplanets and brown dwarfs. This model enables a fully Bayesian inference of the high-dispersion data to fit the ab initio line-by-line spectral computation to the observed spectrum by combining it with the Hamiltonian Monte Carlo in recent probabilistic programming languages. An open-source code, ExoJAX, developed in this study, was written in Python using the GPU/TPU compatible package for automatic differentiation and accelerated linear algebra, JAX. We validated the model by comparing it with existing opacity calculators and a radiative transfer code and found reasonable agreements for the output. As a demonstration, we analyzed the high-dispersion spectrum of a nearby brown dwarf, Luhman 16 A, and found that a model including water, carbon monoxide, and H₂/He collision-induced absorption was well fitted to the observed spectrum (R = 10⁵ and 2.28-2.30 μm). As a result, we found that T0 = 1295$$^{-32}_{+35}$$ K at 1 bar and C/O = 0.62 ± 0.03, which is slightly higher than the solar value. This work demonstrates the potential of a full Bayesian analysis of brown dwarfs and exoplanets as observed by high-dispersion spectrographs and also directly imaged exoplanets as observed by high-dispersion coronagraphy.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1845396

Report Number(s):: SAND2022-1299J; 703264

Journal Information:: The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 2 Vol. 258; ISSN 0067-0049

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Autodifferentiable Spectrum Model for High-dispersion Characterization of Exoplanets and Brown Dwarfs

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