Burned to ashes: How the thermal decomposition of refractory organics in the inner protoplanetary disc impacts the gas-phase C/O ratio Article Swipe
Adrien Houge
,
Anders Johansen
,
Edwin A. Bergin
,
F. J. Ciesla
,
Bertram Bitsch
,
Michiel Lambrechts
,
Thomas Henning
,
Giulia Perotti
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202555164
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202555164
The largest reservoir of carbon in protoplanetary discs is stored in refractory organics, which thermally decompose into the gas phase at the organics line located well into the interior of the water iceline. Because this region is so close to the host star, it is often assumed that the released gaseous material is rapidly accreted and has little effect on the evolution of the disc composition. However, laboratory experiments have shown that the thermal decomposition process is irreversible, breaking macromolecular refractory organics into simpler, volatile carbon-bearing compounds. As a result, unlike the iceline of other volatiles, which traps vapor inwards due to recondensation, the organics line remains permeable, allowing gaseous carbon to diffuse outwards without returning to the solid phase. In this paper, we investigate how this process affects the disc composition, particularly the gas-phase C/H and C/O ratios, by incorporating it into a 1D evolution model for gas and solids and assuming refractory organics dominantly decompose into C 2 H 2 . Our results show that this process allows this carbon-rich gas to survive well beyond the organics line (out to 7 au around a solar-mass star) and for much longer timescales such that its abundance is increased by an order of magnitude. This has several implications in planet formation, notably by altering how the composition of solids and gas relate and regarding the fraction of heavy elements available to giant planets. In the framework of our model, refractory organics significantly influence the evolution of the gas-phase C/O ratio, which may help interpret measurements made with Spitzer and JWST.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202555164
- OA Status
- hybrid
- Cited By
- 5
- References
- 168
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4411202191
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https://openalex.org/W4411202191Canonical identifier for this work in OpenAlex
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https://doi.org/10.1051/0004-6361/202555164Digital Object Identifier
- Title
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Burned to ashes: How the thermal decomposition of refractory organics in the inner protoplanetary disc impacts the gas-phase C/O ratioWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-06-11Full publication date if available
- Authors
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Adrien Houge, Anders Johansen, Edwin A. Bergin, F. J. Ciesla, Bertram Bitsch, Michiel Lambrechts, Thomas Henning, Giulia PerottiList of authors in order
- Landing page
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https://doi.org/10.1051/0004-6361/202555164Publisher landing page
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://doi.org/10.1051/0004-6361/202555164Direct OA link when available
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Physics, Astrophysics, Refractory (planetary science), Thermal, Phase (matter), Gas phase, Thermal decomposition, Astrobiology, Decomposition, Astronomy, Thermodynamics, Chemistry, Organic chemistry, Ecology, Biology, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
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5Total citation count in OpenAlex
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2025: 5Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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