Study Reveals Key Difference in Orbits Between Small and Giant Exoplanets
Scris: 26 Mar 2025, 23:53
The shape of a planet’s orbit is one of its defining features, alongside its size and distance from its host star. While Earth’s orbit is nearly circular, many planets outside our solar system—known as exoplanets—travel on more stretched, elliptical paths. Now, astrophysicists at UCLA have measured the orbital shapes of exoplanets ranging in size from Jupiter to Mars and found that small planets tend to have nearly circular orbits, while larger planets follow orbits that are, on average, four times more elliptical.
This discovery, published in Proceedings of the National Academy of Sciences, points to fundamentally different formation processes for large and small planets.
“We found that near Neptune’s size, there’s a shift,” said lead author Gregory Gilbert, a postdoctoral researcher at UCLA. “Smaller planets almost always have circular orbits, while larger planets frequently have elliptical ones.”
The team analyzed data from NASA’s Kepler Space Telescope, which monitored 150,000 stars for signs of planetary transits—slight dips in starlight caused by a planet passing in front of its star. By studying the precise shape of these light curve dips, the researchers could infer the eccentricity, or elliptical shape, of each planet’s orbit.
One of the biggest challenges was handling the complexity of real stellar systems. “If stars were like uniform light bulbs, this would have been a much simpler task,” said co-author Erik Petigura, a UCLA professor of physics and astronomy. “But each star has its own unique behavior, which made this project incredibly detail-oriented.”
To meet this challenge, UCLA undergraduate Paige Entrican developed a specialized visualization toolkit and manually reviewed over 1,600 light curves. “I had to carefully inspect every data set,” said Entrican. “Sometimes issues only affected about 1% of stars, but that still meant we had to revise and reprocess everything to maintain accuracy.”
The shift in orbital eccentricity also aligns with other known characteristics of exoplanet populations. For instance, small planets are far more common than large ones, and giant planets tend to form around stars rich in heavy elements like iron, carbon, and oxygen.
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“Small planets are frequent and have low eccentricities. Large planets are rare, require metal-rich stars, and have high eccentricities,” Gilbert said. “The fact that all these trends converge near Neptune’s size suggests two distinct formation pathways for small and large planets.”
Scientists believe that planets form from the gradual accumulation of small space rocks. If a planet’s core grows large enough—typically more than 10 times the mass of Earth—it can begin capturing vast amounts of hydrogen and helium, becoming a gas giant like Jupiter or Saturn. But this rapid gas accumulation, or runaway accretion, is only likely if the host star is rich in heavy elements.
Giant planets with elliptical orbits also hint at a more chaotic formation history, involving gravitational interactions that distort orbits and even trigger massive planetary collisions. These collisions could resemble the one that formed Earth’s moon, though on an even larger and more violent scale in some exoplanet systems.
“It’s amazing what we’ve learned about distant planetary systems using Kepler,” Petigura said. “The telescope was named after Johannes Kepler, who first realized planets don’t move in perfect circles. It feels fitting that Kepler’s legacy now includes measuring the subtle orbital shapes of Earth-sized planets around distant stars.”
This discovery, published in Proceedings of the National Academy of Sciences, points to fundamentally different formation processes for large and small planets.
“We found that near Neptune’s size, there’s a shift,” said lead author Gregory Gilbert, a postdoctoral researcher at UCLA. “Smaller planets almost always have circular orbits, while larger planets frequently have elliptical ones.”
The team analyzed data from NASA’s Kepler Space Telescope, which monitored 150,000 stars for signs of planetary transits—slight dips in starlight caused by a planet passing in front of its star. By studying the precise shape of these light curve dips, the researchers could infer the eccentricity, or elliptical shape, of each planet’s orbit.
One of the biggest challenges was handling the complexity of real stellar systems. “If stars were like uniform light bulbs, this would have been a much simpler task,” said co-author Erik Petigura, a UCLA professor of physics and astronomy. “But each star has its own unique behavior, which made this project incredibly detail-oriented.”
To meet this challenge, UCLA undergraduate Paige Entrican developed a specialized visualization toolkit and manually reviewed over 1,600 light curves. “I had to carefully inspect every data set,” said Entrican. “Sometimes issues only affected about 1% of stars, but that still meant we had to revise and reprocess everything to maintain accuracy.”
The shift in orbital eccentricity also aligns with other known characteristics of exoplanet populations. For instance, small planets are far more common than large ones, and giant planets tend to form around stars rich in heavy elements like iron, carbon, and oxygen.
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“Small planets are frequent and have low eccentricities. Large planets are rare, require metal-rich stars, and have high eccentricities,” Gilbert said. “The fact that all these trends converge near Neptune’s size suggests two distinct formation pathways for small and large planets.”
Scientists believe that planets form from the gradual accumulation of small space rocks. If a planet’s core grows large enough—typically more than 10 times the mass of Earth—it can begin capturing vast amounts of hydrogen and helium, becoming a gas giant like Jupiter or Saturn. But this rapid gas accumulation, or runaway accretion, is only likely if the host star is rich in heavy elements.
Giant planets with elliptical orbits also hint at a more chaotic formation history, involving gravitational interactions that distort orbits and even trigger massive planetary collisions. These collisions could resemble the one that formed Earth’s moon, though on an even larger and more violent scale in some exoplanet systems.
“It’s amazing what we’ve learned about distant planetary systems using Kepler,” Petigura said. “The telescope was named after Johannes Kepler, who first realized planets don’t move in perfect circles. It feels fitting that Kepler’s legacy now includes measuring the subtle orbital shapes of Earth-sized planets around distant stars.”