#astronomy 60-second Astro Information: Fixing Supernova Mysteries – Sky & Telescope

September 18, 2021 - Comment

Fixing a 900-year-old Supernova Thriller Infrared photos from the Widefield Infrared Survey Explorer (WISE) present the supernova remnant. At left, blue-green represents emission at 11 microns and longer 22-micron wavelengths. At proper, inexperienced is 11 microns and crimson 22 microns, whereas yellow reveals ultraviolet emission recorded by the Galex house telescope, and contours present X-ray


Fixing a 900-year-old Supernova Thriller

Parker's Star and supernova remnantInfrared photos from the Widefield Infrared Survey Explorer (WISE) present the supernova remnant. At left, blue-green represents emission at 11 microns and longer 22-micron wavelengths. At proper, inexperienced is 11 microns and crimson 22 microns, whereas yellow reveals ultraviolet emission recorded by the Galex house telescope, and contours present X-ray emission. The UV and X-rays come largely from the core of the nebula, the place Parker’s Star burns brilliant and sizzling.
Andreas Ritter et al. / Astrophysical Journal Letters

Virtually a millenium in the past, in 1181 AD, Chinese language astronomers famous a “visitor star” that appeared as brilliant as Saturn of their skies. This visitor marked a supernova that progressively dimmed over the following six months earlier than disappearing from naked-eye view. However although they recorded an approximate location on the sky, no trendy astronomer has been capable of determine the supernova supply.

Now, Albert Zijlstra (College of Manchester, UK) and colleagues announce the detection of the gaseous remnants of a supernova, an enormous bubble increasing at about 1,100 km/s (2.5 million mph). Calculating primarily based on the present charge of growth, the crew estimates the gases originated in a supernova explosion some 1,000 years in the past, at a degree close to the recorded location of the traditional visitor star.

The supernova was possible the merger of two white dwarfs in a kind of explosion astronomers classify as Sort Iax, a uncommon beast that makes up solely 10% of the supernova menagerie. The merger left behind an excessive stellar remnant that the researchers have dubbed “Parker’s Star.”

Learn extra concerning the Chinese language visitor star of 1181 within the College of Manchester press launch and the examine showing within the September 10th Astrophysical Journal Letters.

Supernova Reprise

Gravitationally lensed supernova, four waysNow you see them, now you do not: The large galaxy cluster MACS J0138 bent and magnified the sunshine from a extra distant supernova, dubbed Requiem. Three views of that supernova seem within the 2016 picture on the left (white circles), taken by the Hubble House Telescope. However these photos have light away within the 2019 picture at proper. Researchers predict that mild from the identical supernova will seem once more in 2037 at a fourth location (yellow circle at high left).
Steve A. Rodney (College of South Carolina), Gabriel Brammer (College of Copenhagen); Picture processing: Joseph DePasquale (STScI)

Ten billion years in the past, a star exploded. Its photons journeyed by means of the universe, passing by means of a large galaxy cluster some 6 billion years later. The gravity of these galaxies and their attendant retinues of sizzling gasoline acted like a cosmic lens, bending and magnifying the supernova’s mild, distorting it till it grew to become a number of photos.

These photos appeared in a Hubble House Telescope picture in 2016 earlier than fading away. By 2019, there was no seen remnant of the supernova, dubbed Requiem.

However we’ll see Requiem once more. By the way in which the cluster has bent the background mild, astronomers predict that some photons took a fourth, longer path, they usually’ll take one other 16 years to reach. In 2037, astronomers will see in the event that they’re proper.

Gravitationally lensed supernovae have been noticed earlier than (Supernova Refsdal and iPTF16geu are two notable examples), however the extra of them the higher. As a result of their mild takes a number of paths to Earth, they’re highly effective probes of cosmology, giving astronomers an impartial measure of the much-debated present growth charge of the universe.

Learn extra about Supernova Requiem within the Hubble press launch and on this week’s Nature Astronomy.

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