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H$_2$ formation on interstellar dust grains: the viewpoints of theory, experiments, models and observations

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arxiv 1711.10568 v1 pith:TR5RR7O2 submitted 2017-11-28 astro-ph.GA

Valentine Wakelam , Emeric Bron , Stephanie Cazaux , Francois Dulieu , Cécile Gry , Pierre Guillard , Emilie Habart , Liv Hornek{ae}r
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Sabine Morisset Gunnar Nyman Valerio Pirronello Stephen D. Price Valeska Valdivia Gianfranco Vidali Naoki Watanabe
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keywords formationinterstellarbeenenvironmentsgrainsabundantarticleastrophysical
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abstract

Molecular hydrogen is the most abundant molecule in the universe. It is the first one to form and survive photo-dissociation in tenuous environments. Its formation involves catalytic reactions on the surface of interstellar grains. The micro-physics of the formation process has been investigated intensively in the last 20 years, in parallel of new astrophysical observational and modeling progresses. In the perspectives of the probable revolution brought by the future satellite JWST, this article has been written to present what we think we know about the H$_2$ formation in a variety of interstellar environments.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. HI envelope around the carbon star V420 Vul

    astro-ph.SR 2026-08 conditional novelty 6.0 of 10

    An extended ~20 pc HI structure around the carbon-rich Mira V420 Vul shows symmetric kinematics centered on the star, interpreted as a stellar wind imprint on a porous interstellar cloud.

  2. Pristine composition or size evolution: Can current dust models reproduce emissivities observed in nearby protostars?

    astro-ph.GA 2026-06 unverdicted novelty 4.0 of 10

    Radiative-transfer simulations with common dust models generate a range of spectral indices but cannot reach the lowest observed emissivity indices in protostars without invoking unexpectedly large millimeter-sized grains.

  3. A HINSA view of cosmic-ray ionization in IC 348 and NGC 1333: evidence for a strong low-energy cosmic-ray disparity

    astro-ph.GA 2026-06 unverdicted novelty 4.0 of 10

    HINSA observations show CRIR decreasing with H2 column density in both clouds, with IC 348 values an order of magnitude above NGC 1333, modeled as an order-of-magnitude difference in low-energy CR populations from loc...

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