Spectral Retrieval with JWST Photometric data: a Case Study for HIP 65426 b
Abstract Half of the JWST high-contrast imaging objects will only have photometric data as of Cycle 2. However, to better understand their atmospheric chemistry that informs formation origin, spectroscopic data are preferred. Using HIP 65426 b, we investigate to what extent planet properties and atm...
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Published in | The Astronomical journal Vol. 166; no. 5; pp. 203 - 209 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Madison
The American Astronomical Society
01.11.2023
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
Half of the JWST high-contrast imaging objects will only have photometric data as of Cycle 2. However, to better understand their atmospheric chemistry that informs formation origin, spectroscopic data are preferred. Using HIP 65426 b, we investigate to what extent planet properties and atmospheric chemical abundance can be retrieved with only JWST photometric data points (2.5–15.5
μ
m) in conjunction with ground-based archival low-resolution spectral data (1.0–2.3
μ
m). We find that the data is consistent with an atmosphere with solar metallicity and C/O ratios at 0.40 and 0.55. We rule out 10× solar metallicity and an atmosphere with C/O = 1.0. We also find strong evidence of silicate clouds but no sign of an enshrouding featureless dust extinction. This work offers guidance and cautionary tales on analyzing data in the absence of medium-to-high-resolution spectral data. |
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Bibliography: | The Solar System, Exoplanets, and Astrobiology AAS46883 |
ISSN: | 0004-6256 1538-3881 |
DOI: | 10.3847/1538-3881/acfca0 |