Jupiter’s core may still be reeling from collision 4.5 billion years ago.
A colossal, head-on collision between Jupiter and a still-forming planet in the early solar system, about 4.5 billion years ago, could explain surprising readings from NASA’s Juno spacecraft, according to a study this week in the journal Nature.
Data from NASA’s Juno spacecraft suggests that Jupiter was shaken to its core by a colossal, head-on collision 4.5 billion years ago with a planet about 10 times more massive than Earth.
According to a new study this week in the journal Nature, the planetary impact scenario can explain surprising readings about Jupiter’s gravitational field that Juno has made since arriving at the solar system’s largest planet in 2016. Researchers ran thousands of computer simulations for the study and found the head-on impact scenario best explained Juno’s gravitational readings.
“We have been studying the giant planets, particularly Jupiter and Saturn, since the time of Galileo, but we still don’t know exactly how they formed,” said Rice University astronomer and study co-author Andrea Isella.
Isella said some theories suggest Jupiter began as a dense, rocky planet that later gathered its thick atmosphere from the primordial disk of gas and dust that birthed our sun, Sol. Other theories have Jupiter forming from the gravitational collapse of a portion of the disk. In that case, Jupiter’s core wouldn’t have been dense and rocky from the start, but it would have become increasingly dense as gravity dragged iron and other heavy elements toward the center of the planet.
Astronomers from Rice University and China’s Sun Yat-sen University say their head-on impact scenario can explain Juno’s previously puzzling gravitational readings, which suggest that Jupiter’s core is less dense and more extended than expected.
“This is puzzling,” said Rice astronomer and study co-author Andrea Isella. “It suggests that something happened that stirred up the core, and that’s where the giant impact comes into play.”
Isella said leading theories of planet formation suggest Jupiter began as a dense, rocky or icy planet that later gathered its thick atmosphere from the primordial disk of gas and dust that birthed our sun.
Isella said he was skeptical when study lead author Shang-Fei Liu first suggested the idea that the data could be explained by a giant impact that stirred Jupiter’s core, mixing the dense contents of its core with less dense layers above. Liu, a former postdoctoral researcher in Isella’s group, is now a member of the faculty at Sun Yat-sen in Zhuhai, China.
“It sounded very unlikely to me,” Isella recalled, “like a one-in-a-trillion probability. But Shang-Fei convinced me, by sheer calculation, that this was not so improbable.”
The research team ran thousands of computer simulations and found that a fast-growing Jupiter can have perturbed the orbits of nearby “planetary embryos,” protoplanets that were in the early stages of planet formation.
Liu said the calculations included estimates of the probability of collisions under different scenarios and distribution of impact angles. In all cases, Liu and colleagues found there was at least a 40% chance that Jupiter would swallow a planetary embryo within its first few million years. In addition, Jupiter mass-produced “strong gravitational focusing” that made head-on collisions more common than grazing ones.
Isella said the collision scenario became even more compelling after Liu ran 3D computer models that showed how a collision would affect Jupiter’s core.
“Because it’s dense, and it comes in with a lot of energy, the impactor would be like a bullet that goes through the atmosphere and hits the core head-on,” Isella said. “Before impact, you have a very dense core, surrounded by an atmosphere. The head-on impact spreads things out, diluting the core.”
Impacts at a grazing angle could result in the impacting planet becoming gravitationally trapped and gradually sinking into Jupiter’s core, and Liu said smaller planetary embryos about as massive as Earth would disintegrate in Jupiter’s thick atmosphere.
“The only scenario that resulted in a core-density profile similar to what Juno measures today is a head-on impact with a planetary embryo about 10 times more massive than Earth,” Liu said.
Isella said the calculations suggest that even if this impact happened 4.5 billion years ago, “it could still take many, many billions of years for the heavy material to settle back down into a dense core under the circumstances suggested by the paper.”
Isella, who is also a co-investigator on the Rice-based, NASA-funded CLEVER Planets project, said the study’s implications reach beyond our solar system.
“There are astronomical observations of stars that might be explained by this kind of event,” he said.
“This is still a new field, so the results are far from solid, but as some people have been looking for planets around distant stars, they sometimes see infrared emissions that disappear after a few years,” Isella said. “One idea is that if you are looking at a star as two rocky planets collide head-on and shatter, you could create a cloud of dust that absorbs stellar light and reemits it. So, you kind of see a flash, in the sense that now you have this cloud of dust that emits light. And then after some time, the dust dissipates and that emission goes away.”
The Juno mission was designed to help scientists better understand Jupiter’s origin and evolution. The spacecraft, which launched in 2011, carries instruments to map Jupiter’s gravitational and magnetic fields and probe the planet’s deep, internal structure.
Additional co-authors of the study include Yasunori Hori of the Astrobiology Center of Japan, Simon Müller and Ravit Helled of the University of Zurich, Xiaochen Zheng of Tsinghua University in Beijing and Doug Lin of both the University of California, Santa Cruz, and Tsinghua University in Beijing.
The research was supported by NASA (80NSSC18K0828), the National Science Foundation (AST-1715719), and the Swiss National Science Foundation (200021_169054).
Reference: “The formation of Jupiter’s diluted core by a giant impact” by Shang-Fei Liu, Yasunori Hori, Simon Müller, Xiaochen Zheng, Ravit Helled, Doug Lin and Andrea Isella, 14 August 2019, Nature.