{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,9]],"date-time":"2026-11-09T10:25:18Z","timestamp":1794219918473,"version":"4.8.0"},"reference-count":102,"publisher":"American Astronomical Society","issue":"2","license":[{"start":{"date-parts":[[2026,11,9]],"date-time":"2026-11-09T00:00:00Z","timestamp":1794182400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,11,9]],"date-time":"2026-11-09T00:00:00Z","timestamp":1794182400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["ApJ"],"published-print":{"date-parts":[[2026,11,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    We present the first X-ray detection of the supernova (SN) impostor AT\u00a02016blu in NGC\u00a04559. AT\u00a02016blu exhibited 27 detected quasiperiodic (\u223c113 day) outbursts between 2012 and 2026 June, presumably triggered by periastron passages in an eccentric binary system in which the primary is a \u227333\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>\u2299<\/jats:sub>\n                    luminous blue variable (LBV). AT\u00a02016blu was serendipitously observed by Chandra in 2001\u20132002, prior to its first documented outburst in 2012, but the stacked archival data show no X-ray detection. We monitored the source\u2019s visual-wavelength variability around its predicted outburst time and triggered a Chandra Target of Opportunity (ToO) program in 2026 March, obtaining observations with detections over five closely spaced epochs. These data indicate an X-ray luminosity of\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mi>log<\/mml:mi>\n                        <mml:msub>\n                          <mml:mrow>\n                            <mml:mi>L<\/mml:mi>\n                          <\/mml:mrow>\n                          <mml:mrow>\n                            <mml:mi mathvariant=\"normal\">X<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:msub>\n                        <mml:mo>\u2248<\/mml:mo>\n                        <mml:mn>38.64<\/mml:mn>\n                        <mml:mo>\u00b1<\/mml:mo>\n                        <mml:mn>0.11<\/mml:mn>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    erg s\n                    <jats:sup>\u22121<\/jats:sup>\n                    and an accretion rate of\n                    <jats:inline-formula>\n                      <jats:tex-math>\n                        \n                      <\/jats:tex-math>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mover accent=\"true\">\n                          <mml:mrow>\n                            <mml:mi>M<\/mml:mi>\n                          <\/mml:mrow>\n                          <mml:mrow>\n                            <mml:mo>\u0307<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:mover>\n                        <mml:mo>\u2273<\/mml:mo>\n                        <mml:mn>8<\/mml:mn>\n                        <mml:mo>\u00d7<\/mml:mo>\n                        <mml:mn>1<\/mml:mn>\n                        <mml:msup>\n                          <mml:mrow>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:mrow>\n                          <mml:mrow>\n                            <mml:mo>\u2212<\/mml:mo>\n                            <mml:mn>8<\/mml:mn>\n                          <\/mml:mrow>\n                        <\/mml:msup>\n                        <mml:mspace width=\"0.25em\"\/>\n                        <mml:msub>\n                          <mml:mrow>\n                            <mml:mi>M<\/mml:mi>\n                          <\/mml:mrow>\n                          <mml:mrow>\n                            <mml:mo>\u2299<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:msub>\n                        <mml:mspace width=\"0.25em\"\/>\n                        <mml:msup>\n                          <mml:mrow>\n                            <mml:mi mathvariant=\"normal\">yr<\/mml:mi>\n                          <\/mml:mrow>\n                          <mml:mrow>\n                            <mml:mo>\u2212<\/mml:mo>\n                            <mml:mn>1<\/mml:mn>\n                          <\/mml:mrow>\n                        <\/mml:msup>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    , consistent with the presence of a compact companion. We therefore conclude that AT\u00a02016blu is the first known case of an LBV SN impostor where X-ray observations clearly favor intermittent accretion onto a compact object as the cause of the outbursts. Given that the system consists of a massive star and a compact companion, AT\u00a02016blu is a high-mass X-ray binary (HMXB), similar to SN\u00a02010da, although the donor star in SN\u00a02010da is a red supergiant (RSG).\n                  <\/jats:p>","DOI":"10.3847\/1538-4357\/ae9a86","type":"journal-article","created":{"date-parts":[[2026,11,9]],"date-time":"2026-11-09T09:58:13Z","timestamp":1794218293000},"page":"252","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["AT 2016blu: Accretion-powered Outbursts in a Luminous Blue Variable and Compact Object Binary"],"prefix":"10.3847","volume":"1011","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8341-3940","authenticated-orcid":false,"given":"Mojgan","family":"Aghakhanloo","sequence":"first","affiliation":[{"name":"University of Virginia"},{"name":"University of Virginia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3638-8943","authenticated-orcid":false,"given":"N\u00faria","family":"Torres-Alb\u00e0","sequence":"additional","affiliation":[{"name":"University of Virginia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5510-2424","authenticated-orcid":false,"given":"Nathan","family":"Smith","sequence":"additional","affiliation":[{"name":"University of Arizona"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-7268-7283","authenticated-orcid":true,"given":"Raphael","family":"Baer-Way","sequence":"additional","affiliation":[{"name":"University of Virginia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1856-9225","authenticated-orcid":false,"given":"Shazrene","family":"Mohamed","sequence":"additional","affiliation":[{"name":"University of Virginia"},{"name":"University of Virginia"},{"name":"South African Astronomical Observatory"},{"name":"University of Cape Town"},{"name":"NITheCS National Institute for Theoretical and Computational Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3460-0103","authenticated-orcid":false,"given":"Alexei V.","family":"Filippenko","sequence":"additional","affiliation":[{"name":"University of California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2636-6508","authenticated-orcid":true,"given":"WeiKang","family":"Zheng","sequence":"additional","affiliation":[{"name":"University of California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5955-2502","authenticated-orcid":true,"given":"Thomas G.","family":"Brink","sequence":"additional","affiliation":[{"name":"University of California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4253-656X","authenticated-orcid":false,"given":"D. 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