The first radio images of HD 53143 shed new light on the early development of similar solar systems – ScienceDaily

Using the Atacama Large Millimeter / Submillimeter Array (ALMA), astronomers first imagined a nearby disk of the star HD 53143 in millimeter wavelengths, and it looks like. nothing as expected. Based on initial chronographic data, scientists expected ALMA to confirm the waste disk as a dust-filled face ring. Instead, the observations came as a surprise, revealing the most intricate and eccentric disk of waste ever seen. The observations were presented today at a press conference at the 240th meeting of the American Astronomical Society in Pasadena, California, and will be published in a future edition. The Astrophysical Journal Letters (ApJL).

HD 53143 – an approximate billion-year-old Sun-like star located 59.8 light-years from Earth in the constellation Carina – was observed in 2006 with an advanced chronographic survey camera at the Hubble Space Telescope (HST). it is also surrounded by a disk of debris – a belt of comets orbiting a constantly colliding star and crushed into smaller dust and debris – scientists previously thought it was a ring like a disk of debris orbiting our Sun. Known as the Kuiper Belt.

The new observations were made with HD 53143 at ALMA, a highly sensitive 6 Band 6 receiver in collaboration with the National Radio Astronomy Observatory (NRAO) in collaboration with the US National Science Foundation, and revealed that the stellar disk is actually very large. eccentric. In ring-shaped debris, the star is usually in or near the center of the disk. But in eccentric elliptical disks, the star is in the focus of the ellipse, far from the center of the disk. Such is the case with HD 53143, because choreographers not seen in previous chronographic studies deliberately block the light of a star to see the surrounding objects more clearly. The star system may have a second disk and at least one planet.

“Until now, scientists have never seen a debris disk with an intricate structure. In addition to being an ellipse with a star in a focus, it probably also has a second inner disk that is misaligned or crooked with the outer disk.” said Meredith MacGregor, Assistant Professor in the Department of Astrophysics and Space Astronomy (CASA) and the Department of Astrophysics and Planetary Science (APS) at CU Boulder and lead author of the research. “To produce this structure, there must be planets or planets in the system that are gravitationally disturbing the disk material.”

This level of eccentricity, MacGregor said, makes HD 53143 the most eccentric waste disk ever seen, twice as eccentric as the Fomalhaut waste disk, which MacGregor fully imagined in 2017 using ALMA in millimeter wavelengths. “So far no one was able to send in the perfect solution, which is not strange. they are, as we see them, in our Solar System. “

Most importantly, MacGregor says that waste disks are not just collections of space dust and rocks. They are a historical record of the formation of planets and how planetary systems evolve over time. and take a look at their future. “We can’t look directly at the creation of the Earth and the Solar System, but we can look at other systems that are similar to ours but younger. It’s like looking back in time,” he said. “Waste disks are fossil records of the planet’s formation, and this new result confirms that much more needs to be learned from these systems and that knowledge can provide insight into the intricate dynamics of young star systems similar to our solar system.”

Dr. Joe Pesce, head of the ALMA NSF program, added: “Everywhere we look we find planets, and these excellent results from ALMA show how planets form, both around other stars and in our solar system. This study shows how astronomy works. and it shows how progress is being made, not only by what we know about the field, but also by informing ourselves. “

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