{"id":26805,"date":"2024-11-27T10:14:56","date_gmt":"2024-11-27T02:14:56","guid":{"rendered":"https:\/\/www.curtin.edu.au\/news\/?post_type=media-release&p=26805"},"modified":"2024-11-27T10:16:16","modified_gmt":"2024-11-27T02:16:16","slug":"astronomers-may-have-discovered-the-answer-to-a-mysterious-stellar-event","status":"publish","type":"media-release","link":"https:\/\/www.curtin.edu.au\/news\/media-release\/astronomers-may-have-discovered-the-answer-to-a-mysterious-stellar-event\/","title":{"rendered":"Astronomers may have discovered the answer to a mysterious stellar event"},"content":{"rendered":"\n

Researchers from the Curtin node of the International Centre for Radio Astronomy Research (ICRAR<\/a>) have made a record-breaking astrophysical discovery while simultaneously uncovering a possible explanation for the rare and extreme astrophysical event known as long-period radio transients.<\/p>\n\n\n\n

Associate Professor Natasha Hurley-Walker<\/a>, along with Csan\u00e1d Horv\u00e1th, a Â鶹ֱ²¥ undergraduate student at the time, discovered a pulse of bright energy coming from deep space among archival low-frequency data from the MWA<\/a> (Murchison Widefield Array), a precursor radio telescope to the SKAO<\/a> (Square Kilometre Array Observatory). <\/p>\n\n\n\n

The energy pulse occurs every three hours and lasts 30-60 seconds, making this the longest-period radio transient ever detected.<\/p>\n\n\n\n

Long-period radio transients are relatively new to science, and it has been an ongoing mystery how they generate radio waves.  With this discovery, researchers believe they have also identified the probable source of the energy burst, potentially shedding light on the long radio transients.<\/p>\n\n\n\n

All other previously discovered transients have been deep within our busy galaxy, surrounded by stars, making it challenging to determine precisely what is generating the radio waves.<\/p>\n\n\n\n

Associate Professor Hurley-Walker explains, \u201cThe long-period transients are very exciting, and for astronomers to understand what they are, we need an optical image. However, when you look toward them, there are so many stars lying in the way that it\u2019s like 2001: A Space Odyssey. \u2018My god, it\u2019s full of stars!\u2019.\u201d<\/p>\n\n\n\n

\u201cIn a stroke of good fortune, the newly discovered transient, named GLEAM-X J0704-37, was found on the outskirts of our galaxy, in a much emptier region of space in the Puppis constellation, around 5000 light years away.<\/p>\n\n\n\n

\u201cOur new discovery lies far off the Galactic Plane, so there are only a handful of stars nearby, and we\u2019re now certain one star system, in particular, is generating the radio waves.\u201d<\/p>\n\n\n\n

The team was able to pinpoint the location of the radio waves to one specific star using another SKA precursor, the MeerKAT<\/a> telescope in South Africa. <\/p>\n\n\n\n

Following up with the SOAR<\/a> observatory in Chile, they determined the star’s spectrum, finding it was a low-mass star, an \u2018M dwarf\u2019.<\/p>\n\n\n\n

This finding both created and answered some pressing questions. Associate Professor Hurley-Walker explains, \u201cAn M dwarf alone couldn\u2019t generate the amount of energy we\u2019re seeing.<\/p>\n\n\n\n

\u201cThe M dwarfs are low-mass stars that have a mere fraction of the Sun\u2019s mass and luminosity. They constitute 70 per cent of the stars in the Milky Way, but not one of them is visible to the naked eye.\u201d<\/p>\n\n\n\n

Our data suggests that it is in a binary with another object, which is likely to be a white dwarf, the stellar core of a dying star. Together, they power radio emission.\u201d<\/p>\n\n\n\n

The team is working on follow-up observations that will conclusively determine the nature of the system, and the explanation of this extreme astrophysical event.<\/p>\n\n\n\n

Upon digging through the MWA archives, the astronomers found that GLEAM-X J0704-37 has been active for at least ten years since the MWA started observing; however, it could have been active and undiscovered for even longer, implying there are still many more to be found in archives around the world.<\/p>\n\n\n\n

MWA Director, Professor Steven Tingay<\/a>, said, \u201cThese long-period radio transients are new scientific discoveries and the MWA has fundamentally enabled the discoveries.\u201d<\/p>\n\n\n\n

\u201cThe MWA has a 55-petabyte archive of observations that provide a decade-long record of our Universe. <\/p>\n\n\n\n

“It is like having the data storage equivalent of 55,000 high-end home computers – one of the biggest single collections of science data in the world. <\/p>\n\n\n\n

“It is an absolute gold mine for discovering more phenomena in our Universe, and the data are a playground for astronomers.\u201d<\/p>\n\n\n\n

The research was published overnight in The Astrophysical Journal Letters.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Researchers from the Curtin node of the International Centre for Radio Astronomy Research (ICRAR) have […]<\/p>\n","protected":false},"author":4457,"featured_media":26806,"template":"","meta":{"_acf_changed":false,"_oasis_is_in_workflow":0,"_oasis_original":0,"_oasis_task_priority":"","_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"6420,5950,4926,5741,4867,4611","_relevanssi_noindex_reason":"","wds_primary_category":0,"wds_primary_research-areas":0,"footnotes":""},"categories":[105,104],"tags":[],"research-areas":[],"class_list":["post-26805","media-release","type-media-release","status-publish","has-post-thumbnail","hentry","category-astronomy","category-space-and-physics"],"acf":{"experts":false,"post_options":{"":null,"additional_content":{"title":"","content":"","image":false},"related_courses":[{"title":"","qualification":"","link":"","description":"","faculty":""}],"credits":{"author":"","photographer":"","media":[22646,24381]},"display_author":true,"banner":{"image":false}}},"featured_image":"https:\/\/www.curtin.edu.au\/news\/wp-content\/uploads\/2024\/11\/AdobeStock_478225468-1920x500.jpeg","author_meta":{"first_name":"Sam","last_name":"Jeremic","display_name":"Samuel Jeremic"},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release\/26805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release"}],"about":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/types\/media-release"}],"author":[{"embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/users\/4457"}],"version-history":[{"count":0,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release\/26805\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media\/26806"}],"wp:attachment":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media?parent=26805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/categories?post=26805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/tags?post=26805"},{"taxonomy":"research-areas","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/research-areas?post=26805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}