title: Chondrulelike objects in short-period comet 81P/Wild 2.
abstract: The Stardust spacecraft returned cometary samples that contain crystalline material, but the origin of the material is not yet well understood. We found four crystalline particles from comet 81P/Wild 2 that were apparently formed by flash-melting at a high temperature and are texturally, mineralogically, and compositionally similar to chondrules. Chondrules are submillimeter particles that dominate chondrites and are believed to have formed in the inner solar nebula. The comet particles show oxygen isotope compositions similar to chondrules in carbonaceous chondrites that compose the middle-to-outer asteroid belt. The presence of the chondrulelike objects in the comet suggests that chondrules have been transported out to the cold outer solar nebula and spread widely over the early solar system.
authors.affiliation: Department of Earth and Planetary Science, Faculty of Science, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan. tomoki@geo.kyushu-u.ac.jp
authors.forename: Tomoki
authors.initials: T
authors.lastname: Nakamura
authors.forename: Takaaki
authors.initials: T
authors.lastname: Noguchi
authors.forename: Akira
authors.initials: A
authors.lastname: Tsuchiyama
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ushikubo
authors.forename: Noriko T
authors.initials: NT
authors.lastname: Kita
authors.forename: John W
authors.initials: JW
authors.lastname: Valley
authors.forename: Michael E
authors.initials: ME
authors.lastname: Zolensky
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kakazu
authors.forename: Kanako
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Etsuko
authors.initials: E
authors.lastname: Mashio
authors.forename: Kentaro
authors.initials: K
authors.lastname: Uesugi
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Nakano