Did the Sun swallow a Super-Earth billions of years ago? New scientific study suggests that it may be true. Researchers have particular theory where the young Sun ate a rocky planet several times heavier than the earth. It can explain many of the anomalies that were observed in our star. The best fit theory points to a planet that is 5.6 times as dense as the earth, although this does not prove that such a planet actually existed.
The idea behind the Sun swallow a super-earth is actually simple. In the early solar system, there was a lot of gas, dust and forming planets, whose orbits were not necessarily fixed. A large, rocky planet could have formed close to the young sun and been pulled into it, leaving behind traces of heavy elements and structural clues inside the star. The new study, conducted by astrophysicist Mutlu Yildiz of Ege University, looked at stellar evolution to see whether this theory “Sun swallow a super earth” could explain several discrepancies between theoretical models of the Sun and observations of the real life.
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Why Scientists Think the Sun May Have Swallowed a Super-Earth?
The thought about Sun Swallow a Super-Earth begins with a strange fact about our solar system: We do not have a super-earth. A super-earth is generally a planet that is bigger than earth, but smaller than the ice giants such as Neptune. These planets seem common around other stars, but our solar system has none within this category. This fact led astronomers to think whether a super-earth could have formed close to the young sun, and disappeared latter. Earlier research suggested that there might be one or more super-earths formed inside the Mercury’s orbit, but they were being forced inward through the gas disk surrounding the young sun. The new study takes the idea one step further, by wondering if such evidence could be found inside the sun.
Note that astronomers are not claiming that there is a whole planet inside our sun at the moment, but there may be some traces of planetary material which was swallowed by the young sun. To investigate, researchers used the MESA stellar-evolution code to test different possibilities for the ingestion of material into the young sun. They compared the resulting predictions with observations of the sun’s internal structure and chemistry. The results favored a scenario in which the sun swallow a super-Earth-like planet which was 5 to 10 times more massive than our own.
What Evidence Could a Swallowed Planet Leave Behind?
If this event really happened in which Sun Swallow a Super-Earth, astronomers would not expect to see the planet. They would see some changes in the chemical composition and structure of the Sun.
The theory is based on the fact that planets are formed from the material, which is different from the composition of the sun. Rocky planets have a higher proportion of heavy elements, compared to hydrogen and helium. Therefore, their addition to the Sun will affect the internal structure of the star. According to astronomers’ models, the devoured planet could have produce a region within the Sun, which has an increased concentration of heavy elements. This region appears below the Sun’s convection zone. The convection zone refers to the outer layers of the Sun, where hot plasma is continuously boiling, rising, cooling, and sinking in giant rolling loops that transport energy toward the surface.
Sun Swallow a Super-Earth model suggests that it could leave an anomaly below the convection zone in the Sun. Scientists can study it by using the method of helioseismology. Using it, scientists can analyze the sound waves generated by the star: their speed and pattern will differ, depending on the density and flexibility of the material they pass through. With the help of these data, scientists can study the Sun’s interior, similar to how seismologists analyze earthquakes to learn about the planet’s interior. Standard solar models failed to observe some properties of the Sun in the future. For example, they could not explain the sound-speed profile below the convection zone or its outer boundary. The new model, however, predicts some changes in the composition of the core, corresponding to planetary engulfment. These changes match the observed anomalies in the Sun’s rotation and density.
Another important evidence is lithium. There is much less of this element in the Sun now than it was predicted to be in early times. According to Sun Swallow a Super-Earth theory, the reason for it is that lithium is depleted when the core of the planet falls into the Sun’s atmosphere. The models, which predict that a planet with the mass of 4.6 to 5.8 Earth masses was engulfed by the Sun, best match the observed facts. This does not mean that Sun Swallow a Super-Earth scenario is occurred. However, it might explain several phenomena, which were previously unexplained.
How Big Was the Lost Planet?
One of the most interesting findings from Sun Swallow a Super-Earth is the mass range obtained by the models. The favored range is quite broad, approximately 5-10 Earth masses. This would comfortably fall into the category of a super-Earth. However, the best fit model was even more specific, predicting a planet with a mass of about 5.6 Earth masses. Earth itself contains one Earth mass, so the planet predicted by the best-fit model would be much heavier than Earth, but still, somewhat lighter than Neptune, which has a mass of about 17 Earth masses.
The researchers did not simply pick 5.6 Earth masses for their model. They tried several different possibilities and tested their viability by comparing them with several different observations of our Sun. That is why Sun Swallow a Super-Earth is a valuable study. The best-fit models do not predict a single anomalous property for the hypothetical planet. Instead, they can explain multiple observed characteristics of the real sun, including its internal structure and low lithium abundance on the surface.
However, 5.6 Earth masses should not be considered the mass of missing planet in the solar system. There is no planet that has been directly observed . These masses were only predicted by a model that fits best with the observations of the Sun.
Can Scientists Prove the Sun Swallowed a Super-Earth?
For now, the answer is no. Sun Swallow a Super-Earth is still a scientific hypothesis. The best supporting evidence comes for this theory from the models of the engulfment. They can explain several features of the current sun at the same time including difference between the standard models of the sun and the observations, such as certain properties of the sun’s inner core and its deficiency in lithium. But that’s not quite the same thing as finding evidence for it. There’s a major difference between a model that fits what we see and having independent evidence for something. They would need to find some independent evidence to prove “Sun swallow a Super-Earth”. Maybe if future helioseismology finds the signatures in the sun’s interior that would make the idea “Sun swallow a Super-Earth” much stronger. The researchers are actually careful to point out that it may not be possible to determine independently that the sun swallowed a planet. But if they do find those independent fingerprints, it would help to support the idea that there was a planetary engulfment event occurred long time ago.
Conclusion
The story behind Sun Swallow a Super-Earth is not just simply disappearance of one planet. It ould reveal about how different our Solar System was in its earliest stages. The young Solar System was a violent place where new planets were forming, and existing planet had messy orbits. Gas and dust drifted through space close to the newborn sun and the gravity of these planets could sling each other into their star. A super-Earth could have been pushed into the sun and subsequently swallowed up. If Sun swallow a Super-Earth in early solar system, then it could give answer why our solar system looks different from others. Super-Earths are common around other stars in our galaxy, but they’re absent from our own solar system. However, previous studies have shown that super-Earths could have formed in our solar system, and latter migrated towards the sun. But new research doesn’t prove anything for the existence of this missing planet. but it provides a link between the formation of planets and the chemical composition of the sun.
Did the sun really swallow a super-earth? We’re not sure yet, but the models have made this idea scientifically important because they suggest that our star still holds some clues of a long-vanished planet. At this point, the most accurate statement we can make is that the Sun may have swallowed a super-Earth billions of years ago, and now we have a tool to look for the evidence of such a planet in the Sun’s core. Such evidence would give astronomers a new window onto a solar system’s early history.