TY - JOUR
T1 - Incorporation of A late-forming chondrule into comet Wild 2
AU - Ogliore, R. C.
AU - Huss, G. R.
AU - Nagashima, K.
AU - Butterworth, A. L.
AU - Gainsforth, Z.
AU - Stodolna, J.
AU - Westphal, A. J.
AU - Joswiak, D.
AU - Tyliszczak, T.
PY - 2012/2/1
Y1 - 2012/2/1
N2 - We report the petrology, O isotopic composition, and Al-Mg isotope systematics of a chondrule fragment from the Jupiter-family comet Wild 2, returned to Earth by NASA's Stardust mission. This object shows characteristics of a typeII chondrule that formed from an evolved oxygen isotopic reservoir. No evidence for extinct 26Al was found, with (26Al/ 27Al)0 < 3.0 × 10-6. Assuming homogenous distribution of 26Al in the solar nebula, this particle crystallized at least 3Myr after the earliest solar system objects - relatively late compared to most chondrules in meteorites. We interpret the presence of this object in a Kuiper Belt body as evidence of late, large-scale transport of small objects between the inner and outer solar nebula. Our observations constrain the formation of Jupiter (a barrier to outward transport if it formed further from the Sun than this cometary chondrule) to be more than 3Myr after calcium-aluminum-rich inclusions.
AB - We report the petrology, O isotopic composition, and Al-Mg isotope systematics of a chondrule fragment from the Jupiter-family comet Wild 2, returned to Earth by NASA's Stardust mission. This object shows characteristics of a typeII chondrule that formed from an evolved oxygen isotopic reservoir. No evidence for extinct 26Al was found, with (26Al/ 27Al)0 < 3.0 × 10-6. Assuming homogenous distribution of 26Al in the solar nebula, this particle crystallized at least 3Myr after the earliest solar system objects - relatively late compared to most chondrules in meteorites. We interpret the presence of this object in a Kuiper Belt body as evidence of late, large-scale transport of small objects between the inner and outer solar nebula. Our observations constrain the formation of Jupiter (a barrier to outward transport if it formed further from the Sun than this cometary chondrule) to be more than 3Myr after calcium-aluminum-rich inclusions.
KW - comets: individual (Wild 2)
KW - Kuiper belt: general
KW - planets and satellites: formation
KW - planets and satellites: individual (Jupiter)
UR - https://www.scopus.com/pages/publications/84856014941
U2 - 10.1088/2041-8205/745/2/L19
DO - 10.1088/2041-8205/745/2/L19
M3 - Article
AN - SCOPUS:84856014941
SN - 2041-8205
VL - 745
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L19
ER -