James Webb Space Telescope sees pre-supernova star
So, to have an understanding of 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). A single of the fascinating subjects they’ve keyed in on is WR 124, a stellar “runaway” that is speeding away from house as it sheds gas, dust, and other stellar matter. Situated at a distance of 15,000 light-years from Earth, it is churning via a pre-supernova state that professionals want to study up close.
A new JWST infrared image, captured final summer time 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 at the moment in the “Wolf-Rayet phase,” in which it loses a great deal 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 specific magnitude will go via the Wolf-Rayet transformation as their lifespan winds down. WR 124 is 1 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 a great deal 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 could clarify why that is. “Before Webb, dust-loving astronomers basically did not have sufficient detailed information and facts to discover concerns of dust production in environments like WR 124, and no matter if the dust grains have been huge and bountiful sufficient to survive the supernova and develop into a considerable contribution to the all round dust spending budget. Now these concerns 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.