{"id":222960,"date":"2025-12-09T03:09:11","date_gmt":"2025-12-09T03:09:11","guid":{"rendered":"https:\/\/www.europesays.com\/ie\/222960\/"},"modified":"2025-12-09T03:09:11","modified_gmt":"2025-12-09T03:09:11","slug":"pair-of-exploding-stars-baffle-astronomers","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ie\/222960\/","title":{"rendered":"Pair of exploding stars baffle astronomers"},"content":{"rendered":"

The recent deaths of two white dwarf stars<\/a> are challenging our understanding of both novae<\/a> and the powerful physics underlying star death. According to astronomer John Monnier, the initial analysis of these often dramatic novae offers an \u201cextraordinary leap forward\u201d for the field.<\/p>\n

\u201cThe fact that we can now watch stars explode and immediately see the structure of the material being blasted into space is remarkable,\u201d said the University of Michigan astronomer and a co-author of a study<\/a> published on December 5 in the journal Nature Astronomy<\/a>. \u201cIt opens a new window into some of the most dramatic events in the universe.\u201d<\/p>\n

It takes two to nova. These spectacular moments occur after a dying white dwarf siphons off enough material<\/a> from a nearby companion star. However, experts have long assumed novae ignite as a single, explosive event and two examples are contradicting that hypothesis.<\/p>\n

In 2021, researchers at the Center for High Angular Resolution Astronomy<\/a> (CHARA) Array in California captured images from the eruptions of Nova V1674 Herculis and Nova V1405 Cassiopeiae.Herculis brightened and faded over only a few days, making it one of the fastest nova on record, but it also produced two perpendicular gas outflows. These jets imply that multiple, intermingling ejections powered the nova.<\/p>\n

\"ScientistsScientists at Georgia State\u2019s CHARA Array captured images of Nova V1674 Herculis\u2014one of the fastest stellar explosions on record. Images of Nova V1674 Herculis obtained 2.2 days (left) and 3.2 days (middle) after the explosion. The images reveal the formation of two distinct, perpendicular outflows of gas, as highlighted by the green arrows. The panel on the right shows an artistic impression of the explosion. Credit: CHARA Array<\/a><\/p>\n

These same flows from Nova V1674 Herculis and Nova V1405 Cassiopeiae were also observed by NASA\u2019s Fermi Gamma-ray Space Telescope<\/a>. However, Cassiopeiae went nova much more gradually in these observations. The star retained its outermost layers for over 50 days before ultimately ejecting them, offering astronomers the first direct evidence of a delayed nova expulsion. Like in the case of Herculis, Cassiopeiae\u2019s gamma-rays were also recorded by the Fermi telescope.<\/p>\n

\u201cThese observations allow us to watch a stellar explosion in real time, something that is very complicated and has long been thought to be extremely challenging,\u201d explained Texas Tech University astrophysicist and study co-author Elias Aydi. \u201cInstead of seeing just a simple flash of light, we\u2019re now uncovering the true complexity of how these explosions unfold. It\u2019s like going from a grainy black-and-white photo to high-definition video.\u201d<\/p>\n

The major breakthroughs are thanks to a technique called interferometry<\/a>. The powerful technique lets astronomers compile light from multiple telescopes to sharpen image resolution enough to document quickly evolving and dynamic events like novae. In addition to the recent novae observations, interferometry is most famous for allowing researchers to finally image the Milky Way\u2019s central black hole<\/a>.<\/p>\n

Although the new data likely upends some longstanding theories of novae behavior, experts say their findings will soon help expand our understanding of cosmic interactions.<\/p>\n

\u201cNovae are more than fireworks in our galaxy\u2013they are laboratories for extreme physics,\u201d added study coauthor and Michigan State University astronomer Laura Chomiuk. \u201cBy seeing how and when the material is ejected, we can finally connect the dots between the nuclear reactions on the star\u2019s surface, the geometry of the ejected material and the high-energy radiation we detect from space.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"The recent deaths of two white dwarf stars are challenging our understanding of both novae and the powerful…\n","protected":false},"author":2,"featured_media":222961,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[270],"tags":[54744,18,19,17,38185,133,451,1406,120073],"class_list":{"0":"post-222960","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-space","8":"tag-astronomer","9":"tag-eire","10":"tag-ie","11":"tag-ireland","12":"tag-nova","13":"tag-science","14":"tag-space","15":"tag-university-of-michigan","16":"tag-white-dwarf-stars"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ie\/115687415474415090","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts\/222960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/comments?post=222960"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts\/222960\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/media\/222961"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/media?parent=222960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/categories?post=222960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/tags?post=222960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}