{"id":3066,"date":"2024-02-12T08:29:41","date_gmt":"2024-02-12T07:29:41","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/cs\/?p=3066"},"modified":"2024-03-20T08:30:06","modified_gmt":"2024-03-20T07:30:06","slug":"modry-podtrpaslik-v-dvojhvezde-s-ultrakratkou-obeznou-dobou","status":"publish","type":"post","link":"https:\/\/stel.asu.cas.cz\/cs\/2024\/02\/12\/modry-podtrpaslik-v-dvojhvezde-s-ultrakratkou-obeznou-dobou\/","title":{"rendered":"Modr\u00fd podtrpasl\u00edk v\u00a0dvojhv\u011bzd\u011b s\u00a0ultrakr\u00e1tkou ob\u011b\u017enou dobou"},"content":{"rendered":"\n<p>Dvojhv\u011bzdn\u00fd v\u00fdvoj nab\u00edz\u00ed celou \u0159adu zaj\u00edmav\u00fdch uli\u010dek, jejich\u017e v\u00fdsledkem jsou exotick\u00e9 typy hv\u011bzd. P\u00e9ter N\u00e9meth ze Stel\u00e1rn\u00edho odd\u011blen\u00ed ASU spolupracoval na studii, kter\u00e1 ozn\u00e1mila objev dvojhv\u011bzdy na samotn\u00e9 hranici teoretick\u00fdch limit\u016f. A&nbsp;sou\u010dasn\u011b jde o&nbsp;objekt se slibn\u00fdm potenci\u00e1lem pro budouc\u00ed detektory gravita\u010dn\u00edch vln.<\/p>\n\n\n\n<p>V\u00fdvoj hv\u011bzd ve v\u00edcen\u00e1sobn\u00fdch syst\u00e9mech \u010dasto p\u0159in\u00e1\u0161\u00ed v\u00fdvojov\u00e9 zvraty. \u010c\u00edm t\u011bsn\u011bji u\u00a0sebe dvojhv\u011bzdy ob\u00edhaj\u00ed, t\u00edm v\u011bt\u0161\u00ed se pravd\u011bpodobnost, \u017ee si budou navz\u00e1jem intenzivn\u011b zasahovat do \u017eivota. Ne\u010dekan\u00e9 v\u00fdvojov\u00e9 zm\u011bny nast\u00e1vaj\u00ed nap\u0159\u00edklad v\u00a0p\u0159\u00edpad\u011b, \u017ee se ob\u011b slo\u017eky v\u00a0dvojhv\u011bzd\u011b obklop\u00ed spole\u010dnou ob\u00e1lkou. V\u00fdsledky v\u00fdvoje ve spole\u010dn\u00e9 ob\u00e1lce jsou v\u00a0z\u00e1sad\u011b dva: bu\u010f dojde ke splynut\u00ed hv\u011bzd, nebo naopak tyto hv\u011bzdy spole\u010dnou ob\u00e1lku spole\u010dn\u00fdmi silami odvrhnou. Modely p\u0159edpov\u00eddaj\u00ed, \u017ee v\u00fdsledkem druh\u00e9ho sc\u00e9n\u00e1\u0159e by mohl b\u00fdt syst\u00e9m obsahuj\u00edc\u00ed horkou modrou podtrpasli\u010d\u00ed hv\u011bzdu ob\u00edhaj\u00edc\u00ed druhou slo\u017eku po velmi t\u011bsn\u00e9 ob\u011b\u017en\u00e9 dr\u00e1ze. Tak t\u011bsn\u00e9, \u017ee by ve ztr\u00e1t\u011b momentu hybnosti hr\u00e1lo velkou roli vyza\u0159ov\u00e1n\u00ed gravita\u010dn\u00edch vln, \u010d\u00edm\u017e by do\u0161lo k\u00a0dal\u0161\u00edmu zkracov\u00e1n\u00ed ob\u011b\u017en\u00e9 dr\u00e1hy. P\u0159edpokl\u00e1dan\u00fd teoretick\u00fd limit ob\u011b\u017en\u00e9 periody takov\u00e9 neinteraguj\u00edc\u00ed dvojhv\u011bzdy je kolem 20 minut. V\u00a0literatu\u0159e jsou zn\u00e1my \u010dty\u0159i p\u0159\u00edpady modr\u00fdch podtrpasli\u010d\u00edch hv\u011bzd v\u00a0neinteraguj\u00edc\u00edch dvojhv\u011bzd\u00e1ch s\u00a0ob\u011b\u017enou periodou pod hodinu, ale \u017e\u00e1dn\u00fd z\u00a0nich se nep\u0159ibli\u017euje k\u00a0teoretick\u00e9mu limitu.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.asu.cas.cz\/articles\/2242\/19\/na-cem-pracujeme-modry-podtrpaslik-v-dvojhvezde-s-ultrakratkou-obeznou-dobou\" data-type=\"link\" data-id=\"https:\/\/www.asu.cas.cz\/articles\/2242\/19\/na-cem-pracujeme-modry-podtrpaslik-v-dvojhvezde-s-ultrakratkou-obeznou-dobou\" target=\"_blank\" rel=\"noreferrer noopener\">Pokra\u010dov\u00e1n\u00ed na webu ASU<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Odkazy<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>dal\u0161\u00ed informace na serveru <a href=\"https:\/\/astroserver.org\/references\/Y75AKG\/\" target=\"_blank\" rel=\"noreferrer noopener\">astroserver.org<\/a> (en)<\/li>\n\n\n\n<li>\u010dl\u00e1nek na serveru <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2023arXiv231213612L\/abstract\" target=\"_blank\" rel=\"noreferrer noopener\">NASA\/ADS<\/a> (en)<\/li>\n\n\n\n<li>\u010dl\u00e1nek na serveru <a href=\"https:\/\/arxiv.org\/abs\/2312.13612\" target=\"_blank\" rel=\"noreferrer noopener\">Astro-ph<\/a> (en)<\/li>\n\n\n\n<li>\u010dl\u00e1nek v \u010dasopise <a href=\"https:\/\/www.nature.com\/articles\/s41550-023-02188-2\" target=\"_blank\" rel=\"noreferrer noopener\">Nature Astronomy<\/a> (en)<\/li>\n\n\n\n<li>ZTF J0526+5934 v katalogu <a href=\"https:\/\/simbad.u-strasbg.fr\/simbad\/sim-coo?Coord=05%2026%2010.430000000%2B59%2034%2045.200000000&amp;Radius=2&amp;Radius.unit=arcsec\" target=\"_blank\" rel=\"noreferrer noopener\">SIMBAD<\/a> (en)<\/li>\n\n\n\n<li>Researchers discover a hot subdwarf binary system with shortest known orbital period \u2013 tiskov\u00e1 zpr\u00e1va <a href=\"https:\/\/www.tsinghua.edu.cn\/en\/info\/1245\/12731.htm\" target=\"_blank\" rel=\"noreferrer noopener\">Tsinghua University<\/a><\/li>\n\n\n\n<li>ASU CAS webov\u00e9 str\u00e1nky, \u010dl\u00e1nek: <a href=\"https:\/\/www.asu.cas.cz\/articles\/2242\/19\/na-cem-pracujeme-modry-podtrpaslik-v-dvojhvezde-s-ultrakratkou-obeznou-dobou\" target=\"_blank\" rel=\"noreferrer noopener\">Na \u010dem pracujeme: Modr\u00fd podtrpasl\u00edk v\u00a0dvojhv\u011bzd\u011b s\u00a0ultrakr\u00e1tkou ob\u011b\u017enou dobou<\/a> (cs, M. \u0160vanda)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Citace pr\u00e1ce<\/h4>\n\n\n\n<p>J. Lin, Ch. Wu, H. Xiong, X. Wang, P. N\u00e9meth a&nbsp;kol., <em>A seven-Earth-radius helium-burning star inside a&nbsp;20.5-min detached binary<\/em>, Nature Astronomy v&nbsp;tisku, preprint<a href=\"https:\/\/arxiv.org\/abs\/2312.13612\" target=\"_blank\" rel=\"noreferrer noopener\"> arXiv:2312.13612<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Kontakt<\/h4>\n\n\n\n<p>Dr. P\u00e9ter N\u00e9meth, peter.nemeth@asu.cas.cz<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dvojhv\u011bzdn\u00fd v\u00fdvoj nab\u00edz\u00ed celou \u0159adu zaj\u00edmav\u00fdch uli\u010dek, jejich\u017e v\u00fdsledkem jsou exotick\u00e9 typy hv\u011bzd. P\u00e9ter N\u00e9meth ze Stel\u00e1rn\u00edho odd\u011blen\u00ed ASU spolupracoval na studii, kter\u00e1 ozn\u00e1mila objev<\/p>\n","protected":false},"author":1,"featured_media":3068,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,32],"tags":[],"class_list":["post-3066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-horke-hvezdy","category-novinky"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/comments?post=3066"}],"version-history":[{"count":1,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3066\/revisions"}],"predecessor-version":[{"id":3067,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3066\/revisions\/3067"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media\/3068"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media?parent=3066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/categories?post=3066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/tags?post=3066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}