Chronicle of a Chondrule

1
Chronicle of a Chondrules Travels

• Comet particles collected by the Stardust mission
  contain chondrules and CAIs that formed at much
  higher temperatures than where the icy comet
  accreted
• These high-temperature objects must have formed
  closer to the Sun and moved out beyond the
  planets to the comet-forming region in the Kuiper
  belt
• Analyses on one of these chondrule fragments,
  called Iris, reveals its history of formation
  and outward transport

2
Chronicle of a Chondrules TravelsWhat's Jupiter
Got to Do With It?

• Oxygen isotopic composition of Iris is similar to
  terrestrial oxygen, confirming formation in the
  inner solar nebula
• Aluminum-Magnesium isotope systematics place the
  formation age of Iris at least 3 Myr after CAIs
• Iris must have moved out to the comet-forming
  region before Jupiter could have blocked its way
• Timing implies Jupiter formed more than 3 Myr
  after CAIs