新墨西哥理工

2023年6月6日

在研究古典新星使用国家射电天文台的甚长基线数组(基线),一个研究生研究员发现证据的对象可能被错误地定型为简单。新的观察结果,发现非热能的排放从古典与矮新星的同伴,今天在新闻发布会上提出了在第242届美国天文学会学报在阿尔伯克基的新墨西哥。信贷:b·萨克斯顿(NRAO / AUI / NSF)在研究古典新星使用国家射电天文台的甚长基线数组(基线),一个研究生研究员发现证据的对象可能被错误地定型为简单。新的观察结果,发现非热能的排放从古典与矮新星的同伴,今天在新闻发布会上提出了在第242届美国天文学会学报在阿尔伯克基的新墨西哥。V1674 Herculis主持的是经典的新星白矮星和矮的同伴,目前最快的古典新星。在研究V1674Her基线,蒙大拿威廉姆斯,新墨西哥理工大学研究生是谁领导这个新星VLBA属性的调查,证实了意想不到的:非热能的排放。这个数据很重要,因为它告诉威廉姆斯和她的合作者了很多关于系统中发生了什么。团队已经发现除了简单的燥热引起爆炸科学家此前预期从古典新星。“经典新星历来被认为是简单的爆炸,释放热能,”威廉姆斯说。“然而,基于最近的观察与大面积费米望远镜,这个简单的模型并不完全正确。 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. Media contact: