A Gamma-Ray Burst’s Split Personality: The Week Swift Fell Silent
Astronomy Daily: Latest Space NewsSummary
A recent study published in Nature Astronomy explores a unique gamma-ray burst observed by NASA's Swift Observatory in 2016, which exhibits characteristics of both short and long bursts, challenging existing classification systems. The event, designated as GRB-160425A, featured two distinct emissions: a brief flash lasting 1.7 seconds followed by a longer burst of 51 seconds. Researchers analyzed the light curves and spectral data, concluding that the two emissions likely originate from different cosmic phenomena, suggesting a need to reevaluate the criteria used to categorize gamma-ray bursts.
In another significant finding, a black hole binary system, MAXI J0637-430, displayed unexpected behavior during an outburst. Researchers found that the outer disk of gas surrounding the black hole became hotter and more irradiated as the inner disk shielded it from X-ray emissions during peak activity. This phenomenon indicates that assumptions about the structure of black hole accretion disks may need to be reconsidered, as the outer disk's response to X-ray heating contradicts established theories.
Additionally, astronomers have measured the highest concentration of deuterium-rich methane from the interstellar comet 3I/Atlas, revealing insights into its formation in cold environments. The findings suggest that the comet originated in a region rich in cosmic rays and low in heavy elements, providing clues about the conditions in which it formed.
Finally, NASA's Psyche spacecraft is making significant progress on its journey to a metal-rich asteroid, utilizing Hall effect thrusters for propulsion. The spacecraft is currently in a continuous thrust phase, preparing for its arrival at the asteroid in mid-2029, where it aims to provide valuable information about planetary formation.
Show Notes
Show notes In 2016, NASA's Swift caught a gamma-ray burst that came in two parts: a 1.7-second spike, four minutes of silence, then a 51-second burst from the same spot. A new Nature Astronomy paper finds that nearly every classification test labels the first part a merger and the second a collapsing star. It was published three days after Swift ended science operations. Also today: a black hole disc in MAXI J0637−430 that puffs up and shades itself at just a fifth of the Eddington limit; JWST finds methane in interstellar comet 3I/ATLAS with a deuterium ratio of 3.18%, the highest ever measured in methane anywhere in the solar system; and NASA's Psyche goes to near-continuous thrust and makes the first in-space measurement of Hall-thruster swirl torque. Quick hits: Hera's second braking burn, Dragonfly's first simulated Titan flight, and 20 years of STEREO. Skywatch for Sydney, Los Angeles, New York and London: the Hunter's Moon, Mars and Jupiter closing before dawn, Saturn in the evening and Mercury's last call.
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