{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/117722"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/117722","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Paleo-astronomy: investigations of terrestrial 60Fe forged in near-Earth supernovae","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms","abstract_has_math":false,"creators":["Ertel, Adrienne F."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":["Fields, Brian","Ricker, Paul","Liu, Xin","Looney, Leslie"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-12","date_published":"2022-12","updated_at":"2026-07-22T22:24:56Z","subjects":["Supernova","Nucleosynthesis","Astrophysical Dust Processes","Nuclear Abundances"],"languages":["en","eng"],"rights":["Copyright 2022 Adrienne F. Ertel"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/117722","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fields, Brian","Ricker, Paul","Liu, Xin","Looney, Leslie"]},{"key":"dc:creator","label":"Author","values":["Ertel, Adrienne F."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-12","2022-10-20"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Supernova","Nucleosynthesis","Astrophysical Dust Processes","Nuclear Abundances"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Adrienne F. Ertel"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/117722"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms","The student, Adrienne Ertel, accepted the attached license on 2022-09-14 at 17:42.","The student, Adrienne Ertel, submitted this Dissertation for approval on 2022-09-14 at 18:53.","This Dissertation was approved for publication on 2022-10-20 at 09:50.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18488 on 2023-04-12 at 07:23:32","A plethora of evidence now demonstrates that radioactive 60Fe from two near-Earth supernovae was deposited on Earth in the recent geologic past, beginning at 3 and 7 Myr ago. This work synthesizes all of the detected 60Fe relating to the two supernovae and performs statistical analysis to determine the raindown (fallout) timescale for the 60Fe dust falling on Earth. We find that this timescale is ≳ 1 million years — an order of magnitude larger than the conventional Sedov-profile for the supernova blast wave sweeping over the solar system. We examine the pinball model of charged dust inside a magnetic supernova remnant as a possible mechanism to extend the raindown time to match the observed data, concluding that with this model we are able to reproduce the 60Fe signal seen in deep-sea sediments with a single supernova blast. We then use the fluence (time-integrated flux) from the 60Fe samples to recalculate the distance to the 3 Myr ago supernova. We examine the effects that the full range of the astronomical parameters have on the distance, finding that the ejected mass of 60Fe from the supernova and the fraction of 60Fe that arrives at Earth in dust form play the largest role in the resulting distance estimation. We then calculate the possible distance range to the 3 Myr ago supernova as D ∼ 20 − 140 pc, with a most likely range of D ∼ 50 − 60 pc. Finally, we consider the case of whether atmospheric damage from a 20 pc supernova could have contributed to the End-Devonian extinction and examine possible radioisotope signatures that could be used to show the presence of a supernova."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Paleo-astronomy: investigations of terrestrial 60Fe forged in near-Earth supernovae"]}]}],"canonical_facts":{"dc:contributor":["Fields, Brian","Ricker, Paul","Liu, Xin","Looney, Leslie"],"dc:creator":["Ertel, Adrienne F."],"dc:date":["2022-12","2022-10-20"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms","The student, Adrienne Ertel, accepted the attached license on 2022-09-14 at 17:42.","The student, Adrienne Ertel, submitted this Dissertation for approval on 2022-09-14 at 18:53.","This Dissertation was approved for publication on 2022-10-20 at 09:50.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18488 on 2023-04-12 at 07:23:32","A plethora of evidence now demonstrates that radioactive 60Fe from two near-Earth supernovae was deposited on Earth in the recent geologic past, beginning at 3 and 7 Myr ago. This work synthesizes all of the detected 60Fe relating to the two supernovae and performs statistical analysis to determine the raindown (fallout) timescale for the 60Fe dust falling on Earth. We find that this timescale is ≳ 1 million years — an order of magnitude larger than the conventional Sedov-profile for the supernova blast wave sweeping over the solar system. We examine the pinball model of charged dust inside a magnetic supernova remnant as a possible mechanism to extend the raindown time to match the observed data, concluding that with this model we are able to reproduce the 60Fe signal seen in deep-sea sediments with a single supernova blast. We then use the fluence (time-integrated flux) from the 60Fe samples to recalculate the distance to the 3 Myr ago supernova. We examine the effects that the full range of the astronomical parameters have on the distance, finding that the ejected mass of 60Fe from the supernova and the fraction of 60Fe that arrives at Earth in dust form play the largest role in the resulting distance estimation. We then calculate the possible distance range to the 3 Myr ago supernova as D ∼ 20 − 140 pc, with a most likely range of D ∼ 50 − 60 pc. Finally, we consider the case of whether atmospheric damage from a 20 pc supernova could have contributed to the End-Devonian extinction and examine possible radioisotope signatures that could be used to show the presence of a supernova."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/117722"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Adrienne F. Ertel"],"dc:subject":["Supernova","Nucleosynthesis","Astrophysical Dust Processes","Nuclear Abundances"],"dc:title":["Paleo-astronomy: investigations of terrestrial 60Fe forged in near-Earth supernovae"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Astronomy"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:56Z"}