Items filtered by date: January 2022

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Items filtered by date: January 2022

PolarLight Reveals the Corona Geometry in Sco X-1

On 2022 January 1, Hua Feng's group and their collaborators reported in The Astrophysical Journal Letters a significant detection of X-ray polarization in Sco X-1 with the space mission PolarLight, which has been operating on-orbit for more than three years since its launch in 2018 October. The results help place stringent constraints on the geometry of the hot corona, and mark Sco X-1 as the second astrophysical source with a significant polarization measurement in the keV band.

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Are substructures in different components of protoplanetary disks correlated?

It is commonly believed that planets form in disks surrounding young stars, but how exactly this happens remains an outstanding question. In recent years, astronomers have made great strides in directly observing protoplanetary disks using the Atacama Large Millimeter/submillimeter Array (ALMA), located in the Atacama Desert of Northern Chile. By observing separately the emission from millimeter-sized dust particles and molecular gas, astronomers find plenty of substructures---mostly in the forms of gaps and rings along the radial direction---in both dust and gas. In some disks, the two components show substructures at the same locations. Previous studies argued that these spatially overlapping substructures are casually linked and that the primary suspect is a nearby forming planet.

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