Significantly, the planetesimals produced in these bands belonged to a second generation and formed millions of years after the earliest solid bodies. This timing corresponds to the creation of chondrites - stony meteorites that contain essential chemical and chronological clues from the solar system's infancy.
"Chondrites are like time capsules from the dawn of the solar system," said Izidoro, assistant professor of Earth, environmental and planetary sciences at Rice. "They have fallen to Earth over billions of years, where scientists collect and study them to unlock clues about our cosmic origins. The mystery has always been: Why did some of these meteorites form so late, 2 to 3 million years after the first solids? Our results show that Jupiter itself created the conditions for their delayed birth."
Chondrites are notable for being some of the least altered materials available for study. Unlike first-generation meteorites that underwent melting and differentiation, chondrites preserve pristine dust and chondrules from the solar system. Their comparatively late formation has long puzzled researchers.
"Our model ties together two things that didn't seem to fit before - the isotopic fingerprints in meteorites, which come in two flavors, and the dynamics of planet formation," stated Srivastava, a graduate student in Izidoro's lab. "Jupiter grew early, opened a gap in the gas disk, and that process protected the separation between inner and outer solar system material, preserving their distinct isotopic signatures. It also created new regions where planetesimals could form much later."
The study further clarifies why Earth, Venus and Mars are clustered close to 1 astronomical unit from the sun and avoided spiraling inward, as seen in other planetary systems. Jupiter's early growth cut off the inward flow of gas, restraining the migration of young planets and allowing them to remain in the terrestrial region where Earth and its neighboring planets eventually formed.
"Jupiter didn't just become the biggest planet - it set the architecture for the whole inner solar system," Izidoro noted. "Without it, we might not have Earth as we know it."
Observations of ring-and-gap structures in young stellar systems using the Atacama Large Millimeter/submillimeter Array align with the findings. These structures demonstrate how giant planets, during their formation, reshape their environment.
"Looking at those young disks, we see the beginning of giant planets forming and reshaping their birth environment," Izidoro said. "Our own solar system was no different. Jupiter's early growth left a signature we can still read today, locked inside meteorites that fall to Earth."
This research received support from the National Science Foundation (NSF), the NSF-funded Big-Data Private-Cloud Research Cyberinfrastructure and Rice's Center for Research Computing.
Research Report:The late formation of chondrites as a consequence of Jupiter-induced gaps and rings
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