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JWST measurements of 13 C, 18 O, and 17 O in the atmosphere of Super-Jupiter VHS 1256 b
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Gandhi, Siddharth, de Regt, Sam, Snellen, Ignas, Zhang, Yapeng, Rugers, Benson, van Leur, Niels and Bosschaart, Quincy (2023) JWST measurements of 13 C, 18 O, and 17 O in the atmosphere of Super-Jupiter VHS 1256 b. The Astrophysical Journal Letters, 957 (2). L36. doi:10.3847/2041-8213/ad07e2 ISSN 2041-8213.
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Official URL: https://doi.org/10.3847/2041-8213/ad07e2
Abstract
Isotope ratios have recently been measured in the atmospheres of directly imaged and transiting exoplanets from ground-based observations. The arrival of JWST allows us to characterize exoplanetary atmospheres in further detail and opens up wavelengths inaccessible from the ground. In this work we constrain the carbon and oxygen isotopes 13C, 18O, and 17O from CO in the atmosphere of the directly imaged companion VHS 1256 b through retrievals of the ∼4.1–5.3 μm NIRSpec G395H/F290LP observations from the early-release science program (ERS 1386). We detect and constrain 13C16O, 12C18O, and 12C17O at 32σ, 16σ, and 10σ confidence respectively, thanks to the very high signal-to-noise observations. We find the ratio of abundances are more precisely constrained than their absolute values, with 12C/13C=62−2+2 , in between previous measurements for companions (∼30) and isolated brown dwarfs (∼100). The oxygen isotope ratios are 16O/18O=425−28+33 and 16O/17O=1010−100+120 . All of the ratios are lower than the local interstellar medium and solar system, suggesting that abundances of the more minor isotopes are enhanced compared to the primary. This could be driven by isotope fractionation in protoplanetary disks, which can potentially alter the carbon and oxygen ratios through isotope selective photodissociation, gas/ice partitioning, and isotopic exchange reactions. In addition to CO, we constrain 1H 216O and 12C16O2 (the primary isotopologues of both species), but find only upper limits on 12C1H4 and 14N1H3. This work highlights the power of JWST to constrain isotopes in exoplanet atmospheres, with great promise in determining formation histories in the future.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QB Astronomy | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Library of Congress Subject Headings (LCSH): | Extrasolar planets, Extrasolar planets -- Atmopsheres, Carbon -- Isotopes , Oxygen -- Isotopes, Protoplanetary disks | ||||||
Journal or Publication Title: | The Astrophysical Journal Letters | ||||||
Publisher: | The American Astronomical Society | ||||||
ISSN: | 2041-8213 | ||||||
Official Date: | 10 November 2023 | ||||||
Dates: |
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Volume: | 957 | ||||||
Number: | 2 | ||||||
Article Number: | L36 | ||||||
DOI: | 10.3847/2041-8213/ad07e2 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 14 November 2023 | ||||||
Date of first compliant Open Access: | 14 November 2023 | ||||||
RIOXX Funder/Project Grant: |
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