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UH Leads International Star Study Using NASA’s New $10 Billion Space Telescope

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  • Remains of supernova Cassiopeia A (Cas A), about 11,000 light-years away. Photo credit: NASA
  • Debris from a star that exploded known as Kepler’s supernova remnant Photo credit: NASA
  • An expanding cloud of debris from the death of a massive star called Cosmic Crab. Photo credit: NASA
  • UH Institute for Astronomy is leading an international team of scientists to focus on dying stars during the flagship mission of NASA’s $10 billion James Webb Space Telescope. Photo Courtesy: NASA

How do stars die, explode and release heavy elements into the universe? Chris Ashall, a postdoctoral researcher with the University of Hawaiʻi Institute for Astronomy, will lead an international team of 30 plus scientists to focus on those questions during the flagship mission of NASA’s $10 billion James Webb Space Telescope.

The researchers were recently awarded two programs to conduct detailed observations with the new telescope, set to launch in fall 2021. 

Exploding stars, known as supernovae, produce most of the universe’s heavy elements, such as, iron, calcium and silicon. These elements form the building blocks for life. Supernovae also may be major producers of cosmic dust, but the exact nature of these explosions remains a mystery.  


“We may finally be able to understand the final stages of a star’s life, how they explode, what heavy elements they make, and how these elements are redistributed into the universe,” Ashall said. “It is truly an extremely exciting time for supernova science.” 

The James Webb Space Telescope will have the capability to observe objects at longer wavelengths than its predecessor, the Hubble Space Telescope. Observations at these redder, mid-infrared, wavelengths can detect the signatures of elements that were not previously visible.  

Ashall and the MIR SuperNovA Collaboration (MIRSNAC) will obtain spectra with the new telescope at mid-infrared wavelengths about 7 to 40 times redder than the naked eye can see. Ashall and MIRSNAC will observe two different types of supernovae: those resulting from the deaths of single, massive stars, called Type II, and those resulting from the explosion of lower-mass stars commonly known as white dwarfs, called Type Ia.  


Observations of Type II supernovae will help determine how much cosmic dust these massive, hydrogen-rich stars produce when they die. The Type Ia observations will pin down the masses of white dwarf stars when they explode. This data can be used to measure distances to galaxies, and have been vital to determining the expansion of the universe is accelerating. 

Ashall and the MIRSNAC are among the few select groups to have two projects accepted in the first round of James Webb Space Telescope observations. UH’s Institute for Astronomy will be the center of the collaboration, which consists of more than 30 international scientists from many institutes including Aarhus University, the European Southern Observatory, Florida State University, University of California – Davis, University of Oklahoma and Carnegie Observatories.

UH astronomers also will conduct detailed follow-up observations of galaxies seen in images from JWST. The project is part of the COSMOS-Webb program, comprised of nearly 50 researchers from 30 institutions worldwide, including the Institute for Astronomy, that will use the telescopes on Maunakea to help NASA generate a three-dimensional map of the universe. 


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