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A Comparative L-dwarfSample Exploring theInterplay betweenAtmosphericAssumptions and DataProperties Eileen C. GonzalesB. BurninghamJacqueline K. Faherty2022 год

A Comparative L-dwarf Sample Exploring the Interplay between Atmospheric Assumptions and Data Properties
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Аннотация: Abstract Comparisons of atmospheric retrievals can reveal powerful insights on the strengths and limitations of our data and modeling tools. In this paper, we examine a sample of five L dwarfs of similar effective temperature ( T eff ) or spectral type to compare their pressure–temperature (P-T) profiles. Additionally, we explore the impact of an object’s metallicity and the signal-to-noise ratio (S/N) of the observations on the parameters we can retrieve. We present the first atmospheric retrievals: 2MASS J15261405+2043414, 2MASS J05395200−0059019, 2MASS J15394189−0520428, and GD 165B increasing the small but growing number of L dwarfs retrieved. When compared to the atmospheric retrievals of SDSS J141624.08+134826.7, a low-metallicity d/sdL7 primary in a wide L+T binary, we find that similar T eff sources have similar P-T profiles with metallicity differences impacting the relative offset between their P-T profiles in the photosphere. We also find that for near-infrared spectra, when the S/N is ≳80 we are in a regime where model uncertainties dominate over data measurement uncertainties. As such, S/N does not play a role in the retrieval’s ability to distinguish between a cloud-free and cloudless model, but may impact the confidence of the retrieved parameters. Lastly, we also discuss how to break cloud model degeneracies and the impact of extraneous gases in a retrieval model.
Год издания: 2022
Авторы: Eileen C. Gonzales, B. Burningham, Jacqueline K. Faherty, Nikole K. Lewis, Channon Visscher, Mark S. Marley
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Stellar, planetary, and galactic studies, Gamma-ray bursts and supernovae, Astronomical Observations and Instrumentation
Другие ссылки: The Astrophysical Journal (PDF)
The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
University of Hertfordshire Research Archive (University of Hertfordshire) (PDF)
University of Hertfordshire Research Archive (University of Hertfordshire) (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)