H + irradiation of ordinary chondrites supporting observations of Torifune by Hayabusa2#
Year: 2026
Type: article
Abstract: Context. The Hayabusa2# mission has performed a flyby of the S-type asteroid Torifune, and thanks to the NIRS3 instrument, it has collected infrared spectra in the 3 μm region for the first time on such a small dry body. Aims. We simulated solar wind proton implantation on S-type asteroids and tested whether a 2.7–3 μm band related to hydration, as seen on the Moon, can be formed on anhydrous asteroids. Methods. We performed ion irradiations on pressed pellets of olivine and three ordinary chondrites with 20 keV H + using fluences up to 4 × 10 17 ions cm −2 . Reflectance spectra were acquired in situ before and after irradiation in the near-infrared range (2 − 4 μm). Results. Our results indicate that hydration due to solar wind ions can occur on S-type asteroids through the formation of OH bonds. The process is seen thanks to a band at 2.8 μm that should be detectable in remote sensing data.
Source: Astronomy and Astrophysics
Institutions: Centre National de la Recherche Scientifique, Université Paris-Saclay, Institut d'Astrophysique Spatiale, Tottori University of Environmental Studies, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, The Graduate University for Advanced Studies, SOKENDAI
Language: English
Topic: Astro and Planetary Science
Subfield: Space and Planetary Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W7212373839