LINK<\/strong><\/a><\/p>\n\n\n\n“Ejecta from the explosion of massive stars (core-collapse supernovae) make an important contribution to dust in the interstellar medium. However, dust formation around supernovae is not a simple process, with the formation of several components over time. In particular, the exact timing is a matter of debate. Here, we demonstrate that the isotopic composition of barium in supernova grains that survived in primitive meteorites constitutes a potential chronometer. For a subset of supernova silicon carbide grains (X1 grains), the Ba isotopes indicate that they formed at roughly the same time, and that, at this time, a substantial fraction of the freshly produced unstable 137Cs (half-life 30 yr) had already decayed into 137Ba. Application to the 137Cs\/137Ba system of nucleosynthesis models that replicate the abundance patterns of stable neutron capture isotopes in these grains indicates a surprisingly late (~20 yr) timescale for condensation, a conclusion that naturally rests on the reliability of these models.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Ulrich Ott, Thomas Stephan, Peter Hoppe, and Michael R. Savina The Astrophysical Journal, Volume 885, Number 2 LINK “Ejecta from the explosion of massive stars (core-collapse supernovae) make an important contribution to dust in the…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,76],"tags":[390,5265,5266,3855,1853,3647,1712],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20682"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=20682"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20682\/revisions"}],"predecessor-version":[{"id":20683,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20682\/revisions\/20683"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}