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|    EARTH    |    Uhh, that 3rd rock from the sun?    |    8,931 messages    |
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|    Message 8,473 of 8,931    |
|    ScienceDaily to All    |
|    Not your average space explosion: Very l    |
|    07 Jun 23 22:30:32    |
      MSGID: 1:317/3 6481596a       PID: hpt/lnx 1.9.0-cur 2019-01-08       TID: hpt/lnx 1.9.0-cur 2019-01-08        Not your average space explosion: Very long baseline array finds       classical novae are anything but simple                Date:        June 7, 2023        Source:        National Radio Astronomy Observatory        Summary:        While studying classical novae using the National Radio Astronomy        Observatory's Very Long Baseline Array (VLBA), a graduate researcher        uncovered evidence the objects may have been erroneously typecast        as simple. The new observations detected non-thermal emission from        a classical nova with a dwarf companion.                      Facebook Twitter Pinterest LinkedIN Email              ==========================================================================       FULL STORY       ==========================================================================       While studying classical novae using the National Radio Astronomy       Observatory's Very Long Baseline Array (VLBA), a graduate researcher       uncovered evidence the objects may have been erroneously typecast as       simple. The new observations, which detected non-thermal emission from a       classical nova with a dwarf companion, were presented today at a press       conference during the 242nd proceedings of the American Astronomical       Society in Albuquerque, New Mexico.              V1674 Herculis is a classical nova hosted by a white dwarf and dwarf       companion and is currently the fastest classical nova on record. While       studying V1674Her with the VLBA, Montana Williams, a graduate student at       New Mexico Tech who is leading the investigation into the VLBA properties       of this nova, confirmed the unexpected: non-thermal emission coming from       it. This data is important because it tells Williams and her collaborators       a lot about what's happening in the system. What the team has found is       anything but the simple heat-induced explosions scientists previously       expected from classical novae.              "Classical novae have historically been considered simple explosions,       emitting mostly thermal energy," said Williams. "However, based on recent       observations with the Fermi Large Area Telescope, this simple model is       not entirely correct.              Instead, it seems they're a bit more complicated. Using the VLBA, we were       able to get a very detailed picture of one of the main complications,       the non- thermal emission." Very long baseline interferometry (VLBI)       detections of classical novae with dwarf companions like V1674Her are       rare. They're so rare, in fact, that this same type of detection, with       resolved radio synchrotron components, has been reported just one other       time to date. That's partly because of the assumed nature of classical       novae.              "VLBI detections of novae are only recently becoming possible because       of improvements to VLBI techniques, most notably the sensitivity of the       instruments and the increasing bandwidth or the amount of frequencies       we can record at a given time," said Williams. "Additionally, because       of the previous theory of classical novae they weren't thought to be       ideal targets for VLBI studies. We now know this isn't true because of       multi-wavelength observations which indicate a more complex scenario."       That rarity makes the team's new observations an important step in       understanding the hidden lives of classical novae and what ultimately       leads to their explosive behavior.              "By studying images from the VLBA and comparing them to other observations       from the Very Large Array (VLA), Fermi-LAT, NuSTAR, and NASA-Swift,       we can determine what might be the cause of the emission and also make       adjustments to the previous simple model," said Williams. "Right now,       we're trying to determine if the non-thermal energy is coming from clumps       of gas running into other clumped gas which produces shocks, or something       else." Because Fermi-LAT and Nu-Star observations had already indicated       that there might be non-thermal emission coming from V1674Her, that made       the classical nova an ideal candidate for study because Williams and her       collaborators are on a mission to either confirm or deny those types of       findings. It was also more interesting, or cute, as Williams puts it,       because of its hyper-fast evolution, and because, unlike supernovae,       the host system isn't destroyed during that evolution, but rather,       remains almost completely intact and unchanged after the explosion. "Many       astronomical sources don't change much over the course of a year or       even 100 years. But this nova got 10,000 times brighter in a single day,       then faded back to its normal state in just about 100 days," she said.              "Because the host systems of classical novae remain intact they can be       recurrent, which means we might see this one erupt, or cutely explode,       again and again, giving us more opportunities to understand why and       how it does." The National Radio Astronomy Observatory (NRAO) is a       major facility of the National Science Foundation (NSF) operated under       cooperative agreement by Associated Universities, Inc.               * RELATED_TOPICS        o Space_&_Time        # Stars # Space_Telescopes # Astrophysics #        Space_Exploration # Nebulae # NASA # Astronomy #        Solar_System        * RELATED_TERMS        o Space_observatory o Green_Bank_Telescope o Radio_telescope        o Astronomy o Physics o Johannes_Kepler o Nicolaus_Copernicus        o Supernova              ==========================================================================       Story Source: Materials provided by       National_Radio_Astronomy_Observatory. Note: Content may be edited for       style and length.                     ==========================================================================                     Link to news story:       https://www.sciencedaily.com/releases/2023/06/230607004121.htm              --- up 1 year, 14 weeks, 2 days, 10 hours, 50 minutes        * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)       SEEN-BY: 15/0 106/201 114/705 123/120 153/7715 218/700 226/30 227/114       SEEN-BY: 229/110 112 113 307 317 400 426 428 470 664 700 291/111 292/854       SEEN-BY: 298/25 305/3 317/3 320/219 396/45       PATH: 317/3 229/426           |
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