Diamond Planet? Really have
Beijing time on May 29, the Science Daily reported that a recent study by astronomers at Yale University in the United States showed that carbon-rich planets may be more common than previously thought. These planets are located outside the solar system, and they may contain large amounts of graphite deposits or diamonds. The existence of such planets implies a new problem, that is, the enrichment of carbon-rich environments on climate, plate motion and other geological processes and life. significance.
The number of diamond planets may be more than imagined
“Although there is relatively little carbon on Earth, carbon is critical to the emergence of life and the use of carbon-silicon cycles to regulate climate,†said Yale University PhD student John Moriarty. “This is an open question about how carbon-rich chemical processes will affect the habitability of exoplanets. We hope that our findings will stimulate scientists' interest in research and help answer these questions.â€
The study was conducted by Moriarty in collaboration with Yale University astronomer Debra Fischer and former Yale postdoctoral fellow, Nikku Madhusudhan of the University of Cambridge, England.
An exoplanet is a planet that is located outside the solar system. In October 2012, Maid Sukhhan published an article arguing that the planet 55 Cancrie, a multi-rock exoplanet that is twice as large as the Earth, may be covered by graphite and diamonds.
Astronomers generally believe that rocky planets are mainly composed of iron, oxygen, magnesium and silicon, and contain only a small fraction of carbon. In contrast, carbon-rich planets contain carbons ranging from a few percent to 75%, and the Earth's carbon content is only 0.005%.
Moriarty, Maid Suhan and Fisher established a more advanced model that can estimate the components of the exoplanet. The previous model was based on a static snapshot of the gas pool (or gas disk) formed by the planet, and the latest model can track changes as the composition of the gas disk continues to age.
The researchers found that if the carbon-to-oxygen ratio of the gas disk exceeds 0.8, then the carbon-rich planet is formed farther from the center of the gas disk than expected. In addition, carbon-rich planets can be formed in gas disks with carbon-to-oxygen ratios as low as 0.65, provided they are very close to the host star.
Previous models predicted that carbon-rich planets could only be formed in gas disks with a carbon-oxygen ratio above 0.8. The latest findings are important because stars with a carbon-oxygen ratio above 0.65 are much more numerous than stars with a carbon-oxygen ratio above 0.8.
"Our research shows that the alien world may be very diverse in terms of chemical composition, including many planets that are very different from ours." There are already more than 1,000 confirmed exoplanets. More than 3,000 exoplanet candidates.
“An important question is whether our planet is a typical rocky planet,†Fisher said. “Although the number of newly discovered exoplanets is constantly increasing, we are still unable to answer this question with certainty. The latest research expands the range of factors that may or may affect the habitability of other planets.†The study was published in the journal Astrophysics.
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