J/ApJ/924/L9ivo://CDS.VizieR/J/ApJ/924/L9doi:10.26093/cds/vizier.19249009CDSHasegawa S.Marsset M.DeMeo F.E.Bus S.J.Ishiguro M.Kuroda D.,Binzel R.P.Hanus J.Nakamura A.M.Yang B.Vernazza P.2023-11-15T12:49:59Z2023-09-13T14:13:53ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frasteroidssolar-systeminfrared-astronomyspectroscopyDust emission was detected on main-belt asteroid 596 Scheila in 2010 December and was attributed to the collision of a few-tens-of-meters projectile on the surface of the asteroid. In such an impact, the ejected material from the collided body is expected to mainly come from its fresh, unweathered subsurface. Therefore, it is expected that the surface of 596 was partially or entirely refreshed during the 2010 impact. By combining spectra of 596 from the literature and our own observations, we show that the 2010 impact event resulted in a significant slope change in the near-infrared (0.8-2.5{mu}m) spectrum of the asteroid, from moderately red (T type) before the impact to red (D type) after the impact. This provides evidence that red carbonaceous asteroids become less red with time due to space weathering, in agreement with predictions derived from laboratory experiments on the primitive Tagish Lake meteorite, which is spectrally similar to 596. This discovery provides the very first telescopic confirmation of the expected weathering trend of asteroids spectrally analog to Tagish Lake and/or anhydrous chondritic porous interplanetary dust particles. Our results also suggest that the population of implanted objects from the outer solar system is much larger than previously estimated in the main belt, but many of these objects are hidden below their space-weathered surfaces.2022ApJ...924L...9Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/924/L9CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/118 : UBVRI standards around Celestial Equator (Landolt 1983)J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011)J/PASJ/63/1117 : Asteroid catalog using AKARI (AcuA). V1. (Usui+, 2011)J/AJ/152/54 : Sp. of main-belt Ch/Cgh-type asteroids (Vernazza+, 2016)J/PASJ/71/1 : AKARI Near Infrared Asteroid Spectral Catalog V1 (Usui+, 2019)J/A+A/654/A48 : V-band photometry of asteroids from ASAS-SN (Hanus+, 2021)J/A+A/654/A56 : Largest main belt asteroids data (Vernazza+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/924/L9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/924/L9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/924/L9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/924/L9https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/924/L9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/924/L9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/924/L9/fig1Comparison of 596's NIR spectra before and after the 2010 impact eventrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime relative to impact ("After" or "Before")time.epochcharlambda[0.43/2.48] Wavelengthumem.wlfloatNRef[0.86/1.96] Normalized reflectancephys.albedofloat