Untangling what happened in our Solar System tens or hundreds of millions of years ago is challenging. Millions of objects of wildly different masses interacted for billions of years, seeking natural stability. But its history\u2014including the migration of the giant planets\u2014explains what we see today in our Solar System and maybe in other, distant solar systems. <\/p>\n
New research shows that giant planet migration began shortly after the Solar System formed.<\/p>\n
<\/p>\n Planetary migration is a well-established idea. The Grand-Tack Hypothesis says that Jupiter formed at 3.5 AU, migrated inward to 1.5 AU, and then back out again to 5.2 AU, where it resides today. Saturn was involved, too. Migration can also explain the Hot Jupiters we see orbiting extremely close to their stars in other solar systems. They couldn\u2019t have formed there, so they must have migrated there. Even rocky planets can migrate early in a solar system\u2019s history. <\/p>\n New research in the journal Science establishes dates for giant planet migration in our Solar System. Its title is \u201cDating the Solar System\u2019s giant planet orbital instability using enstatite meteorites.\u201d The lead author is Dr. Chrysa Avdellidou from the University of Leicester\u2019s School of Physics and Astronomy.<\/p>\n \u201cThe question is, when did it happen?\u201d Dr. Avdellidou asked. \u201cThe orbits of these planets destabilised due to some dynamical processes and then took their final positions that we see today. Each timing has a different implication, and it has been a great matter of debate in the community.\u201d<\/p>\n \u201cWhat we have tried to do with this work is to not only do a pure dynamical study, but combine different types of studies, linking observations, dynamical simulations, and studies of meteorites.\u201d<\/p>\n The meteorites in this study are enstatites or E-type asteroids. E-type asteroids have enstatite (MgSiO3) achondrite surfaces. Achondrite means they lack chondrules, grains of rock that were once molten before being accreted to their parent body. Specifically, this group of meteorites are the low-iron chondrites called ELs. <\/p>\n When giant planets move, everything else responds. Tiny asteroids are insignificant compared to Jupiter\u2019s mass. Scientists think E-type asteroids were dispersed during the gas giants\u2019 outward migration. They may even have been the impactors in the hypothetical Late Heavy Bombardment.<\/p>\n Enstatite achondrites that have struck Earth have similar compositions and isotope ratios as Earth. This signals that they formed in the same part of the protoplanetary disk around the young Sun. Previous research by Dr. Avdellidou and others has linked the meteorites to a population of fragments in the asteroid belt named Athor. <\/p>\n This work hinges on linking meteorites to parent asteroids and measuring the isotopic ratios. <\/p>\n \u201cIf a meteorite type can be linked to a specific parent asteroid, it provides insight into the asteroid\u2019s composition, time of formation, temperature evolution, and original size,\u201d the authors explain. When it comes to composition, isotopic abundances are particularly important. Different isotopes decay at different rates, so analyzing their ratio tells researchers when each meteorite closed, meaning when it became cool enough that there was no more significant diffusion of isotopes. \u201cTherefore, thermochronometers in meteorites can constrain the epoch at which major collisional events disturbed the cooling curves of the parent asteroid,\u201d the authors explain. <\/p>\n The team\u2019s research shows that Athor is a part of a once much larger parent body that formed closer to the Sun. It also suffered from a collision that reduced its size out of the asteroid belt. <\/p>\n Athor found its way back when the giant planets migrated. Athor was at the mercy of all that shifting mass and underwent its own migration back into the asteroid belt. Analysis of the meteorites showed that this couldn\u2019t have happened earlier than 60 million years ago. Other research into asteroids in Jupiter\u2019s orbit showed it couldn\u2019t have happened later than 100 million years ago. Since the Solar System formed about 4.56 billion years ago, the giant planet migration happened between 4.5 and 4.46 billion years ago. <\/p>\n A shows the formation and cooling of the EL parent planetesimal in the terrestrial planet region before 60 Myr after Solar System formation. In this period, the terrestrial planets began scattering planetesimals to orbits with high eccentricity and semimajor axes corresponding to the asteroid main belt. B shows that between 60 and 100 Myr, the EL planetesimal was destroyed by an impact in the terrestrial planet region. At least one fragment (the Athor family progenitor) was scattered by the terrestrial planets into the scattered disk, as in (A). Then the giant planet instability implanted it into the inner main belt by decreasing its eccentricity. C shows that a few tens of millions of years after the giant planet instability occurred, a giant impact between the planetary embryo Theia and proto-Earth formed the Moon. D shows that the Athor family progenitor experienced another impact event that formed the Athor family at ~1500 Myr. Image Credit: Avdellidou et al. 2024.<\/p>\n<\/figcaption><\/figure>\n Another important event happened right around the same time. About 4.5 billion years ago, a protoplanet named Theia smashed into Earth, creating the Moon. Could it all be related?<\/p>\n \u201cThe formation of the Moon also occurred within the range that we determined for the giant planet instability,\u201d the authors write in their research. \u201cThis might be a coincidence, or there might be a causal relationship between the two events.\u201d <\/p>\n \u201cIt\u2019s like you have a puzzle, you understand that something should have happened, and you try to put events in the correct order to make the picture that you see today,\u201d Dr. Avdellidou said. \u201cThe novelty with the study is that we are not only doing pure dynamical simulations, or only experiments, or only telescopic observations.\u201d<\/p>\n \u201cThere were once five inner planets in our Solar System and not four, so that could have implications for other things, like how we form habitable planets. Questions like, when exactly objects came delivering volatile and organics to our planet to Earth and Mars?\u201d<\/p>\n The Solar System\u2019s history is a convoluted, beautiful puzzle that somehow led to us. Everything had to work out for life to arise on Earth, sustain itself, and evolve for so long. The epic migration of the gas giants must have played a role, and this research brings its role into focus. <\/p>\n Never mind habitability, complex life, and civilization, the migration may have allowed Earth to form in the first place.<\/p>\n \u201cThe timing is very important because our Solar System at the beginning was populated by a lot of planetesimals,\u201d said study co-author Marco Delbo, Director of Research at France\u2019s Nice Observatory. \u201cAnd the instability clears them, so if that happens 10 million years after the beginning of the Solar System, you clear the planetesimals immediately, whereas if you do it after 60 million years you have more time to bring materials to Earth and Mars.\u201d <\/p>\n![\"This](\"https:\/\/www.universetoday.com\/wp-content\/uploads\/2024\/04\/Athor-and-Giant-Planet-Migration.png\")
![\"Artist's](\"https:\/\/www.universetoday.com\/wp-content\/uploads\/2008\/10\/moon_formation.jpg\")
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