• Mon. Mar 20th, 2023

James Webb Space Telescope sees pre-supernova star


Mar 15, 2023

So, to fully grasp what a star’s demise really entails, astronomers have to zoom about to other components of the galaxy with tools such as GAIA and the James Webb Space Telescope (JWST). One particular of the fascinating subjects they’ve keyed in on is WR 124, a stellar “runaway” that is speeding away from property as it sheds gas, dust, and other stellar matter. Positioned at a distance of 15,000 light-years from Earth, it is churning by means of a pre-supernova state that specialists want to study up close.

A new JWST infrared image, captured final summer season but shared publicly this week, exposes some of the explosive particulars scientists have been searching for. The telescope made use of a spectrograph and two of its sophisticated cameras to record the halo of dust emanating from WR 124. The star is presently in the “Wolf-Rayet phase,” in which it loses substantially of its mass to surrounding space. The vibrant white spot at the center shows the burning stellar core the pink and purple ripples represent a nebula of hydrogen and other ejecta.

Stars of a particular magnitude will go by means of the Wolf-Rayet transformation as their lifespan winds down. WR 124 is a single of the mightiest stars in the Milky Way, with three,000 % extra mass than our sun. But its finish is nye—it will collapse into a supernova in a couple of hundred thousand years or so.

[Related: This could be a brand new type of supernova]

Till then, astronomers will use pictures and other information from JWST to measure WR 124’s contribution to the universe’s “dust spending budget.” Dust is necessary to the universe’s workings, as NASA explains. The stuff protects young stars and types a foundation for necessary molecules—and planets. But substantially extra of it exists than astronomers can account for, the space agency notes: “The universe is operating with a dust spending budget surplus.”

The spectacular cloud about WR 124 may clarify why that is. “Before Webb, dust-loving astronomers just did not have adequate detailed data to discover queries of dust production in environments like WR 124, and no matter if the dust grains had been big and bountiful adequate to survive the supernova and turn into a substantial contribution to the all round dust spending budget. Now these queries can be investigated with actual information,” NASA shared.

As JWST enters its second year of exploration, the observatory will take a sweeping appear at galaxies far and close to to reconstruct a timeline of the early universe. But person stars can add to that cosmological understanding, also, even if they are not on a glorious death march like WR 124.