{"id":"https://openalex.org/W1965917458","doi":"https://doi.org/10.1086/430408","title":"The Three\u2010dimensional Circumstellar Environment of SN 1987A","display_name":"The Three\u2010dimensional Circumstellar Environment of SN 1987A","publication_year":2005,"publication_date":"2005-06-20","ids":{"openalex":"https://openalex.org/W1965917458","doi":"https://doi.org/10.1086/430408","mag":"1965917458"},"language":"en","primary_location":{"id":"doi:10.1086/430408","doi":"https://doi.org/10.1086/430408","is_oa":true,"landing_page_url":"https://doi.org/10.1086/430408","pdf_url":"https://iopscience.iop.org/article/10.1086/430408/pdf","source":{"id":"https://openalex.org/S183686791","display_name":"The Astrophysical Journal Supplement Series","issn_l":"0067-0049","issn":["0067-0049","1538-4365"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["anvur-scientific","cwts-core","doaj","dongbi-a","jufo-2","ki-jl-2","norway-2","oarl","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astrophysical Journal Supplement Series","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["arxiv","crossref","datacite","doaj"],"open_access":{"is_oa":true,"oa_status":"bronze","oa_url":"https://iopscience.iop.org/article/10.1086/430408/pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Ben E. K. Sugerman","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1297127228","display_name":"Space Telescope Science Institute","ror":"https://ror.org/036f5mx38","country_code":"US","type":"facility","lineage":["https://openalex.org/I1297127228","https://openalex.org/I1313867356"]},{"id":"https://openalex.org/I78577930","display_name":"Columbia University","ror":"https://ror.org/00hj8s172","country_code":"US","type":"education","lineage":["https://openalex.org/I78577930"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Ben E. K. Sugerman","raw_affiliation_strings":["Department of Astronomy, Columbia University, New York, NY 10027","Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Astronomy, Columbia University, New York, NY 10027","institution_ids":["https://openalex.org/I78577930"]},{"raw_affiliation_string":"Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218","institution_ids":["https://openalex.org/I1297127228"]}]},{"author_position":"middle","author":{"id":null,"display_name":"Arlin P. S. Crotts","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4210140583","display_name":"Cerro Tololo Inter-American Observatory","ror":"https://ror.org/03w6nzd18","country_code":"CL","type":"facility","lineage":["https://openalex.org/I1311060795","https://openalex.org/I1313867356","https://openalex.org/I4210140583","https://openalex.org/I4210141577"]},{"id":"https://openalex.org/I78577930","display_name":"Columbia University","ror":"https://ror.org/00hj8s172","country_code":"US","type":"education","lineage":["https://openalex.org/I78577930"]}],"countries":["CL","US"],"is_corresponding":false,"raw_author_name":"Arlin P. S. Crotts","raw_affiliation_strings":["Department of Astronomy, Columbia University, New York, NY 10027","Guest Observer, Cerro Tololo Inter-American Observatory"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Astronomy, Columbia University, New York, NY 10027","institution_ids":["https://openalex.org/I78577930"]},{"raw_affiliation_string":"Guest Observer, Cerro Tololo Inter-American Observatory","institution_ids":["https://openalex.org/I4210140583"]}]},{"author_position":"middle","author":{"id":null,"display_name":"William E. Kunkel","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4210124388","display_name":"Carnegie Observatories","ror":"https://ror.org/03h4zjr91","country_code":"US","type":"facility","lineage":["https://openalex.org/I196817621","https://openalex.org/I4210124388"]},{"id":"https://openalex.org/I4210145100","display_name":"Las Campanas Observatory","ror":"https://ror.org/042ga5208","country_code":"CL","type":"facility","lineage":["https://openalex.org/I4210145100"]}],"countries":["CL","US"],"is_corresponding":false,"raw_author_name":"William E. Kunkel","raw_affiliation_strings":["Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile","institution_ids":["https://openalex.org/I4210124388","https://openalex.org/I4210145100"]}]},{"author_position":"middle","author":{"id":null,"display_name":"Stephen R. Heathcote","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Stephen R. Heathcote","raw_affiliation_strings":["Southern Observatory for Astronomical Research, Casilla 603, La Serena, Chile"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Southern Observatory for Astronomical Research, Casilla 603, La Serena, Chile","institution_ids":[]}]},{"author_position":"last","author":{"id":null,"display_name":"Stephen S. Lawrence","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I139290212","display_name":"Hofstra University","ror":"https://ror.org/03pm18j10","country_code":"US","type":"education","lineage":["https://openalex.org/I139290212"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Stephen S. Lawrence","raw_affiliation_strings":["Department of Physics, Hofstra University, Hempstead, NY 11549"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Physics, Hofstra University, Hempstead, NY 11549","institution_ids":["https://openalex.org/I139290212"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":6,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":4499,"currency":"USD","value_usd":4499},"apc_paid":null,"fwci":2.8525,"has_fulltext":true,"cited_by_count":82,"citation_normalized_percentile":{"value":0.89168033,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":99},"biblio":{"volume":"159","issue":"1","first_page":"60","last_page":"99"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11323","display_name":"Gamma-ray bursts and supernovae","score":0.8154000043869019,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11323","display_name":"Gamma-ray bursts and supernovae","score":0.8154000043869019,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.1543000042438507,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10477","display_name":"Astrophysics and Star Formation Studies","score":0.015799999237060547,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/sn-1987a","display_name":"SN 1987A","score":0.996999979019165},{"id":"https://openalex.org/keywords/circumstellar-environment","display_name":"circumstellar environment","score":0.847000002861023},{"id":"https://openalex.org/keywords/light-echoes","display_name":"light echoes","score":0.8799999952316284},{"id":"https://openalex.org/keywords/circumstellar-dust","display_name":"circumstellar dust","score":0.7329999804496765},{"id":"https://openalex.org/keywords/interacting-stellar-winds","display_name":"interacting stellar winds","score":0.7950000166893005},{"id":"https://openalex.org/keywords/bipolar-nebulae","display_name":"bipolar nebulae","score":0.7170000076293945},{"id":"https://openalex.org/keywords/hourglass","display_name":"hourglass","score":0.5090000033378601},{"id":"https://openalex.org/keywords/contact-discontinuity","display_name":"contact discontinuity","score":0.8640000224113464},{"id":"https://openalex.org/keywords/red-supergiant-progenitor","display_name":"red supergiant progenitor","score":0.8029999732971191},{"id":"https://openalex.org/keywords/mass-loss-history","display_name":"mass-loss history","score":0.7879999876022339},{"id":"https://openalex.org/keywords/dust-grain-size","display_name":"dust grain size","score":0.777999997138977},{"id":"https://openalex.org/keywords/difference-imaging","display_name":"image subtraction","score":0.5649999976158142},{"id":"https://openalex.org/keywords/supernova-progenitors","display_name":"supernova progenitors","score":0.6340000033378601}],"concepts":[{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.6424999833106995},{"id":"https://openalex.org/C179801107","wikidata":"https://www.wikidata.org/wiki/Q5898","display_name":"Red supergiant","level":4,"score":0.6026999950408936},{"id":"https://openalex.org/C44870925","wikidata":"https://www.wikidata.org/wiki/Q37547","display_name":"Astrophysics","level":1,"score":0.6000999808311462},{"id":"https://openalex.org/C178635117","wikidata":"https://www.wikidata.org/wiki/Q747499","display_name":"RADIUS","level":2,"score":0.5809000134468079},{"id":"https://openalex.org/C6293838","wikidata":"https://www.wikidata.org/wiki/Q2722426","display_name":"Bipolar nebula","level":5,"score":0.49810001254081726},{"id":"https://openalex.org/C127532173","wikidata":"https://www.wikidata.org/wiki/Q179904","display_name":"Hourglass","level":2,"score":0.4772000014781952},{"id":"https://openalex.org/C197807790","wikidata":"https://www.wikidata.org/wiki/Q208395","display_name":"Prolate spheroid","level":2,"score":0.4327000081539154},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.4262999892234802},{"id":"https://openalex.org/C187204502","wikidata":"https://www.wikidata.org/wiki/Q12053157","display_name":"Bipolar outflow","level":4,"score":0.4115999937057495},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.3686999976634979},{"id":"https://openalex.org/C198785896","wikidata":"https://www.wikidata.org/wiki/Q193599","display_name":"Supergiant","level":3,"score":0.35269999504089355},{"id":"https://openalex.org/C153465967","wikidata":"https://www.wikidata.org/wiki/Q718647","display_name":"Angular diameter","level":3,"score":0.33889999985694885},{"id":"https://openalex.org/C2776368116","wikidata":"https://www.wikidata.org/wiki/Q1086143","display_name":"Circumstellar envelope","level":3,"score":0.3314000070095062},{"id":"https://openalex.org/C198352243","wikidata":"https://www.wikidata.org/wiki/Q37105","display_name":"Line (geometry)","level":2,"score":0.3151000142097473},{"id":"https://openalex.org/C29705727","wikidata":"https://www.wikidata.org/wiki/Q294562","display_name":"Polar","level":2,"score":0.2892000079154968},{"id":"https://openalex.org/C2777042112","wikidata":"https://www.wikidata.org/wiki/Q5281658","display_name":"Discontinuity (linguistics)","level":2,"score":0.2831000089645386},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.28189998865127563},{"id":"https://openalex.org/C2781052500","wikidata":"https://www.wikidata.org/wiki/Q2230313","display_name":"Shell (structure)","level":2,"score":0.2612000107765198},{"id":"https://openalex.org/C30695634","wikidata":"https://www.wikidata.org/wiki/Q208395","display_name":"Oblate spheroid","level":2,"score":0.25920000672340393},{"id":"https://openalex.org/C127592171","wikidata":"https://www.wikidata.org/wiki/Q3937","display_name":"Supernova","level":2,"score":0.2547999918460846},{"id":"https://openalex.org/C8865038","wikidata":"https://www.wikidata.org/wiki/Q1012875","display_name":"Circumstellar dust","level":3,"score":0.25459998846054077}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1086/430408","doi":"https://doi.org/10.1086/430408","is_oa":true,"landing_page_url":"https://doi.org/10.1086/430408","pdf_url":"https://iopscience.iop.org/article/10.1086/430408/pdf","source":{"id":"https://openalex.org/S183686791","display_name":"The Astrophysical Journal Supplement Series","issn_l":"0067-0049","issn":["0067-0049","1538-4365"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["anvur-scientific","cwts-core","doaj","dongbi-a","jufo-2","ki-jl-2","norway-2","oarl","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astrophysical Journal Supplement Series","raw_type":"journal-article"},{"id":"pmh:oai:arXiv.org:astro-ph/0502378","doi":null,"is_oa":true,"landing_page_url":"http://arxiv.org/abs/astro-ph/0502378","pdf_url":"https://arxiv.org/pdf/astro-ph/0502378","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},{"id":"pmh:oai:cds.cern.ch:823801","doi":null,"is_oa":false,"landing_page_url":"http://cds.cern.ch/record/823801","pdf_url":null,"source":{"id":"https://openalex.org/S4306402195","display_name":"CERN Document Server (European Organization for Nuclear Research)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I67311998","host_organization_name":"European Organization for Nuclear Research","host_organization_lineage":["https://openalex.org/I67311998"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":null},{"id":"doi:10.48550/arxiv.astro-ph/0502378","doi":"https://doi.org/10.48550/arxiv.astro-ph/0502378","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.astro-ph/0502378","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"article-journal"}],"best_oa_location":{"id":"doi:10.1086/430408","doi":"https://doi.org/10.1086/430408","is_oa":true,"landing_page_url":"https://doi.org/10.1086/430408","pdf_url":"https://iopscience.iop.org/article/10.1086/430408/pdf","source":{"id":"https://openalex.org/S183686791","display_name":"The Astrophysical Journal Supplement Series","issn_l":"0067-0049","issn":["0067-0049","1538-4365"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["anvur-scientific","cwts-core","doaj","dongbi-a","jufo-2","ki-jl-2","norway-2","oarl","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astrophysical Journal Supplement Series","raw_type":"journal-article"},"sustainable_development_goals":[],"study_designs":[],"awards":[{"id":"https://openalex.org/G433322167","display_name":null,"funder_award_id":"NAS5- 26555","funder_id":"https://openalex.org/F4320314503","funder_display_name":"Space Telescope Science Institute"},{"id":"https://openalex.org/G4518818167","display_name":null,"funder_award_id":"5-26555","funder_id":"https://openalex.org/F4320314503","funder_display_name":"Space Telescope Science Institute"},{"id":"https://openalex.org/G58316358","display_name":null,"funder_award_id":"NAS 526555","funder_id":"https://openalex.org/F4320306101","funder_display_name":"National Aeronautics and Space Administration"},{"id":"https://openalex.org/G6273510985","display_name":null,"funder_award_id":"26555","funder_id":"https://openalex.org/F4320314503","funder_display_name":"Space Telescope Science Institute"},{"id":"https://openalex.org/G767601387","display_name":null,"funder_award_id":"526555","funder_id":"https://openalex.org/F4320306101","funder_display_name":"National Aeronautics and Space Administration"},{"id":"https://openalex.org/G8210229802","display_name":null,"funder_award_id":"NAS 5-26555","funder_id":"https://openalex.org/F4320306076","funder_display_name":"National Science Foundation"}],"funders":[{"id":"https://openalex.org/F4320306076","display_name":"National Science Foundation","ror":"https://ror.org/021nxhr62"},{"id":"https://openalex.org/F4320306101","display_name":"National Aeronautics and Space Administration","ror":"https://ror.org/027ka1x80"},{"id":"https://openalex.org/F4320309398","display_name":"California Institute of Technology","ror":"https://ror.org/05dxps055"},{"id":"https://openalex.org/F4320314503","display_name":"Space Telescope Science Institute","ror":"https://ror.org/036f5mx38"}],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W1965917458.pdf","grobid_xml":"https://content.openalex.org/works/W1965917458.grobid-xml"},"referenced_works_count":67,"referenced_works":["https://openalex.org/W1626578989","https://openalex.org/W1696631956","https://openalex.org/W1965372241","https://openalex.org/W1967298095","https://openalex.org/W1967826689","https://openalex.org/W1967847439","https://openalex.org/W1968897159","https://openalex.org/W1977835405","https://openalex.org/W1978408293","https://openalex.org/W1979630913","https://openalex.org/W1980451268","https://openalex.org/W1980569694","https://openalex.org/W1983883141","https://openalex.org/W1988891829","https://openalex.org/W1995895984","https://openalex.org/W1998862619","https://openalex.org/W1999182952","https://openalex.org/W1999522619","https://openalex.org/W2001111432","https://openalex.org/W2002223706","https://openalex.org/W2003861375","https://openalex.org/W2004757923","https://openalex.org/W2005421394","https://openalex.org/W2006869439","https://openalex.org/W2007755096","https://openalex.org/W2015337391","https://openalex.org/W2019773469","https://openalex.org/W2021392917","https://openalex.org/W2023016496","https://openalex.org/W2023502387","https://openalex.org/W2034608771","https://openalex.org/W2036991733","https://openalex.org/W2038623940","https://openalex.org/W2040596038","https://openalex.org/W2050119562","https://openalex.org/W2050547342","https://openalex.org/W2051522995","https://openalex.org/W2052345092","https://openalex.org/W2052838731","https://openalex.org/W2053752075","https://openalex.org/W2057752225","https://openalex.org/W2060926369","https://openalex.org/W2064727073","https://openalex.org/W2067304651","https://openalex.org/W2070737820","https://openalex.org/W2070951595","https://openalex.org/W2077017611","https://openalex.org/W2077131220","https://openalex.org/W2077134122","https://openalex.org/W2082456781","https://openalex.org/W2087519115","https://openalex.org/W2090644218","https://openalex.org/W2095203653","https://openalex.org/W2095248655","https://openalex.org/W2100315542","https://openalex.org/W2100524229","https://openalex.org/W2110894331","https://openalex.org/W2153805318","https://openalex.org/W2165084703","https://openalex.org/W2167635287","https://openalex.org/W2212234492","https://openalex.org/W2985727267","https://openalex.org/W2991509511","https://openalex.org/W4231986549","https://openalex.org/W4237913875","https://openalex.org/W4240901708","https://openalex.org/W6636663537"],"related_works":["https://openalex.org/W7097910505","https://openalex.org/W2003861375","https://openalex.org/W7100277393","https://openalex.org/W7099814812","https://openalex.org/W1489038068","https://openalex.org/W1493982311","https://openalex.org/W1985313048","https://openalex.org/W2021392917","https://openalex.org/W2488274295","https://openalex.org/W1515797921"],"abstract_inverted_index":{"Surrounding":[0],"SN":[1],"1987A":[2],"is":[3,153,166,191,198,209,314,335],"a":[4,104,123,143,167,201,210,227,300,340],"three-ring":[5],"nebula":[6],"attributed":[7],"to":[8,57,126,155,186,200,207,223,260,275,288],"interacting":[9],"stellar":[10],"winds,":[11,165],"yet":[12],"no":[13],"model":[14],"has":[15],"successfully":[16],"reproduced":[17],"this":[18,47,195,208],"system.":[19],"Fortunately,":[20],"the":[21,36,39,53,60,70,91,135,138,157,174,180,192,224,241,255,258,261,269,281,292,311,317,329,332,347,351],"progenitor's":[22,61],"mass-loss":[23],"history":[24],"can":[25],"be":[26,156,187],"reconstructed":[27],"using":[28,64],"light":[29,34],"echoes,":[30],"in":[31,109,215,247,346],"which":[32,152,197,221],"scattered":[33],"from":[35,69,79,90,273,286,328],"supernova":[37],"traces":[38],"three-dimensional":[40],"morphology":[41],"of":[42,59,77,131,137,194,203,240,243,254,303,310],"its":[43],"circumstellar":[44,62,140],"dust.":[45],"In":[46],"paper,":[48],"we":[49],"construct":[50],"and":[51,66,87,103,163,176,217,237,250,291,319,325,343],"analyze":[52],"most":[54],"complete":[55],"map":[56],"date":[58],"environment,":[63,141],"ground-":[65],"space-based":[67],"imaging":[68],"past":[71],"16":[72],"years.":[73],"PSF-matched":[74],"difference-imaging":[75],"analyses":[76,130],"data":[78],"1988":[80],"through":[81],"1997":[82],"reveal":[83],"material":[84],"between":[85,160],"1":[86,213],"28":[88,171],"lt-yr":[89,172,178,214,219,327],"SN.":[92,256],"Previously":[93,115],"known":[94],"structures,":[95],"such":[96,121],"as":[97,122,350],"an":[98,188],"inner":[99],"hourglass,":[100,212],"Napoleon's":[101,127,182],"Hat,":[102,183],"contact":[105,158],"discontinuity,":[106],"are":[107,118,233,322],"probed":[108],"greater":[110],"spatial":[111],"detail":[112],"than":[113],"before.":[114],"unknown":[116],"features":[117],"also":[119],"discovered,":[120],"southern":[124,320],"counterpart":[125],"Hat.":[128],"Careful":[129],"these":[132],"echoes":[133],"allows":[134],"reconstruction":[136],"probable":[139],"revealing":[142],"richly":[144],"structured":[145],"bipolar":[146,263],"nebula.":[147],"An":[148],"outer,":[149],"double-lobed":[150],"\"Peanut,\"":[151],"believed":[154,185],"discontinuity":[159],"red":[161],"supergiant":[162],"main-sequence":[164],"prolate":[168],"shell":[169],"extending":[170],"along":[173],"poles":[175],"11":[177],"near":[179],"equator.":[181],"previously":[184],"independent":[189],"structure,":[190],"waist":[193],"Peanut,":[196],"pinched":[199],"radius":[202,216],"6":[204],"lt-yr.":[205],"Interior":[206],"cylindrical":[211],"4":[218],"long,":[220],"connects":[222],"Peanut":[225],"by":[226],"thick":[228],"equatorial":[229,333],"disk.":[230],"The":[231,297,308],"nebulae":[232,298],"inclined":[234],"41\u00b0":[235],"south":[236],"8\u00b0":[238],"east":[239],"line":[242],"sight,":[244],"slightly":[245],"elliptical":[246,336],"cross":[248],"section,":[249],"marginally":[251],"offset":[252,345],"west":[253],"From":[257],"hourglass":[259],"large,":[262],"lobes,":[264],"echo":[265],"fluxes":[266],"suggest":[267],"that":[268],"gas":[270],"density":[271],"drops":[272],"1-3":[274],"\u22730.03":[276],"cm":[277],"-3":[278],",":[279],"while":[280,331],"maximum":[282],"dust-grain":[283],"size":[284],"increases":[285],"~0.2":[287],"2":[289],"\u03bcm,":[290],"silicate:carbonaceous":[293],"dust":[294],"ratio":[295],"decreases.":[296],"have":[299],"total":[301],"mass":[302],"~1.7":[304],"M":[305],"\u2609":[306],".":[307],"geometry":[309],"three":[312],"rings":[313,321],"studied,":[315],"suggesting":[316],"northern":[318],"located":[323],"1.3":[324],"1.0":[326],"SN,":[330],"ring":[334],"(":[337],"b":[338],"/":[339],"\u2272":[341],"0.98),":[342],"spatially":[344],"same":[348],"direction":[349],"hourglass.":[352]},"counts_by_year":[{"year":2026,"cited_by_count":2},{"year":2025,"cited_by_count":4},{"year":2024,"cited_by_count":8},{"year":2023,"cited_by_count":2},{"year":2022,"cited_by_count":4},{"year":2021,"cited_by_count":3},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":4},{"year":2018,"cited_by_count":6},{"year":2017,"cited_by_count":2},{"year":2016,"cited_by_count":1},{"year":2015,"cited_by_count":4},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":6},{"year":2012,"cited_by_count":5}],"updated_date":"2026-11-07T11:25:07.637180","created_date":"2016-06-24T00:00:00"}