BOWIE-ALIGN: Sub-solar C/O ratio and metallicity atmosphere of the misaligned hot Jupiter HAT-P-30 b

ABSTRACT We present the JWST NIRSpec/G395H transmission spectrum of the misaligned hot Jupiter HAT-P-30b from 2.8–5.2 $\mu$m as part of the BOWIE-ALIGN survey, a comparative survey designed to probe the link between planet formation and atmospheric composition in samples of misaligned and aligned hot Jupiters orbiting F-type stars. Through independent data reductions and retrieval analyses, we find evidence for absorption features of $\mathrm{H_{2}O}$ and $\mathrm{CO_{2}}$ in the atmosphere of HAT-P-30 b. Our retrieved abundances are consistent with equilibrium chemistry, from which we infer a sub-solar C/O ratio (0.16–0.45), and sub-solar and sub-stellar metallicity (0.2–0.8$\times$solar, compared to a stellar metallicity of 1.1–1.6$\times$solar), with muted spectral features. This composition challenges formation models of continuous migration and accretion within a steady disc of stellar metallicity, and could be the result of low C/O ratio gas accretion within the water ice line, low metallicity accretion due to the trapping of volatiles further out in the disc, or the combined accretion of low metallicity gas and carbon-poor solids.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2026-01-21
DOI
https://doi.org/10.1093/mnras/stag143
Primary Topic
Astro and Planetary Science
Type
article
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article

BOWIE-ALIGN: Sub-solar C/O ratio and metallicity atmosphere of the misaligned hot Jupiter HAT-P-30 b

Duncan Christie, Annabella Meech, James E. Owen, Chloe Fisher et al.
Monthly Notices of the Royal Astronomical Society
Astro and Planetary Science
article

BOWIE-ALIGN: Sub-solar C/O ratio and metallicity atmosphere of the misaligned hot Jupiter HAT-P-30 b

Duncan Christie, Annabella Meech, James E. Owen, Chloe Fisher, Maria Zamyatina, Daniel Thorngren, Daniel T. Valentine, Nathan J. Mayne, Vatsal Panwar, M. López-Morales, Denis E. Sergeev, Alastair B Claringbold, Charlotte Fairman, Mason McCormack, Lili Alderson, Peter J Wheatley, James Kirk, Richard A Booth, Hannah R Wakeford, Anna B T Penzlin
article en

Abstract

ABSTRACT We present the JWST NIRSpec/G395H transmission spectrum of the misaligned hot Jupiter HAT-P-30b from 2.8–5.2 $\mu$m as part of the BOWIE-ALIGN survey, a comparative survey designed to probe the link between planet formation and atmospheric composition in samples of misaligned and aligned hot Jupiters orbiting F-type stars. Through independent data reductions and retrieval analyses, we find evidence for absorption features of $\mathrm{H_{2}O}$ and $\mathrm{CO_{2}}$ in the atmosphere of HAT-P-30 b. Our retrieved abundances are consistent with equilibrium chemistry, from which we infer a sub-solar C/O ratio (0.16–0.45), and sub-solar and sub-stellar metallicity (0.2–0.8$\times$solar, compared to a stellar metallicity of 1.1–1.6$\times$solar), with muted spectral features. This composition challenges formation models of continuous migration and accretion within a steady disc of stellar metallicity, and could be the result of low C/O ratio gas accretion within the water ice line, low metallicity accretion due to the trapping of volatiles further out in the disc, or the combined accretion of low metallicity gas and carbon-poor solids.

Monthly Notices of the Royal Astronomical SocietyVol. 546(4)
Space Telescope Science Institute (US), University of Leeds (GB), Johns Hopkins University (US), Cornell University (US), University of Exeter (GB), Johns Hopkins Medicine (US), University of Bristol (GB), University of Warwick (GB), University of Oxford (GB), University of Chicago (US), Max Planck Institute for Astronomy (DE), Center for Astrophysics Harvard & Smithsonian (US), Bristol Robotics Laboratory (GB), Imperial College London (GB), University of Baltimore (US), Ludwig-Maximilians-Universität München (DE)
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Astro and Planetary Science
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