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    MIRI tagged posts

    Webb Detects Water Vapor in Rocky Planet-Forming One

    July 26, 2023, Categories  Astronomy/Space

    This artist’s concept portrays the star PDS 70 and its inner protoplanetary disk. New measurements by NASA’s James Webb Space Telescope have detected water vapor at distances of less than 100 million miles from the star – the region where rocky, terrestrial planets may be forming. This is the first detection of water in the terrestrial region of a disk already known to host two or more protoplanets, one of which is shown at upper right.
    Credits: NASA, ESA, CSA, J. Olmsted (STScI)

    Water is essential for life as we know it. However, scientists debate how it reached the Earth and whether the same processes could seed rocky exoplanets orbiting distant stars. New insights may come from the planetary system PDS 70, located 370 light-years away...

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    MIRI instrument on JWST detects H-alpha emission during the Epoch of Reionization for the first time

    June 14, 2023, Categories  Astronomy/Space

    MIRI instrument on JWST detects H-alpha emission during the Epoch of Reionization for the first time

    An international team of astronomers led by Pierluigi Rinaldi of the University of Groningen has detected for the first time H-alpha emission in individual galaxies during the so-called Epoch of Reionization, or cosmic dawn. To do so, they used the deepest images taken so far by the MIRI instrument on the James Webb Space Telescope. The result has been accepted for publication in The Astrophysical Journal, and is currently published on the arXiv preprint server.

    Star-forming galaxies produce a large amount of UV photons, but during the Epoch of Reionization these photons are absorbed by the intergalactic medium. The best tracer to measure the level of star formation is the H-alpha emission line in the optical spectrum...

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