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OH as a probe of the warm water cycle in planet-forming disks

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arxiv 2312.14056 v2 pith:HNON3NCW submitted 2023-12-21 astro-ph.EP astro-ph.GAastro-ph.SR

Marion Zannese , Benoît Tabone , Emilie Habart , Javier R. Goicoechea , Alexandre Zanchet , Ewine F. van Dishoeck , Marc C. van Hemert , John H. Black
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Alexander G. G. M. Tielens A. Veselinova P. G. Jambrina M. Menendez E. Verdasco F. J. Aoiz L. Gonzalez-Sanchez Boris Trahin Emmanuel Dartois Olivier Berné Els Peeters Jinhua He Ameek Sidhu Ryan Chown Ilane Schroetter Dries Van De Putte Amélie Canin Felipe Alarcón Alain Abergel Edwin A. Bergin Jeronimo Bernard-Salas Christiaan Boersma Emeric Bron Jan Cami Daniel Dicken Meriem Elyajouri Asunción Fuente Karl D. Gordon Lina Issa Christine Joblin Olga Kannavou Baria Khan Ozan Lacinbala David Languignon Romane Le Gal Alexandros Maragkoudakis Raphael Meshaka Yoko Okada Takashi Onaka Sofia Pasquini Marc W. Pound Massimo Robberto Markus Röllig Bethany Schefter Thiébaut Schirmer Sílvia Vicente Mark G. Wolfire
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classification astro-ph.EPastro-ph.GAastro-ph.SR
keywords waterwarmplanet-formingdestroyeddestructiondisksgas-phaseinfrared
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Water is a key ingredient for the emergence of life as we know it. Yet, its destruction and reformation in space remains unprobed in warm gas. Here, we detect the hydroxyl radical (OH) emission from a planet-forming disk exposed to external far-ultraviolet (FUV) radiation with the James Webb Space Telescope. The observations are confronted with the results of quantum dynamical calculations. The highly excited OH infrared rotational lines are the tell-tale signs of H2O destruction by FUV. The OH infrared ro-vibrational lines are attributed to chemical excitation via the key reaction O+H=OH+H which seeds the formation of water in the gas-phase. We infer that the equivalent of the Earth ocean's worth of water is destroyed per month and replenished. These results show that under warm and irradiated conditions water is destroyed and efficiently reformed via gas-phase reactions. This process, assisted by diffusive transport, could reduce the HDO/H2O ratio in the warm regions of planet-forming disks.

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Cited by 3 Pith papers

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  1. A possible trail of dust from a young, highly-extincted brown dwarf in the outskirts of the Trapezium Cluster

    astro-ph.SR 2025-02 conditional novelty 7.0 of 10

    A candidate brown dwarf appears to have a 1700 au long dust trail, possibly formed by external photoevaporation or by Bondi-Hoyle accretion.

  2. JWST/MIRI Detection of Molecular H$_2$ Winds from an Edge-on Class II Source HV Tau C

    astro-ph.SR 2026-07 conditional novelty 6.0 of 10

    The edge-on Class II disk HV Tau C hosts a spatially extended, wide-angled molecular hydrogen wind with warm (~600 K) and hot (~2000 K) components and a mass-loss rate near 1e-8 solar masses per year.

  3. MINDS. JWST-MIRI reveals a peculiar CO$_2$-rich chemistry in the drift-dominated disk CX Tau

    astro-ph.EP 2024-12 conditional novelty 6.0 of 10

    In the drift-dominated disk CX Tau, JWST finds bright mid-infrared CO2 with weak H2O, plus cold ~200 K 13CO2 and H2O components, suggesting icy pebbles are still being delivered while water has already peaked.

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