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Real-time discovery of AT2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta

Laher RR; Bhalerao V; Kulkarni SR; Kool EC; Bellm EC; Nicholl M; Inserra C; Van Roestel J; Gutierrez CP; Kasliwal MM; Neill JD; Masci FJ; Ho AYQ; Anderson JP; Anupama GC; Ihanec N; Walters R; Fremling C; Barway S; Graham MJ; Schulze S; Sharma Y; Galbany L; Yao YH; Sollerman J; Pursiainen M; Gromadzki M; Kumar H; Chen TW; Perley DA; Wiseman P; Duev DA

dc.contributor.authorLaher RR
dc.contributor.authorBhalerao V
dc.contributor.authorKulkarni SR
dc.contributor.authorKool EC
dc.contributor.authorBellm EC
dc.contributor.authorNicholl M
dc.contributor.authorInserra C
dc.contributor.authorVan Roestel J
dc.contributor.authorGutierrez CP
dc.contributor.authorKasliwal MM
dc.contributor.authorNeill JD
dc.contributor.authorMasci FJ
dc.contributor.authorHo AYQ
dc.contributor.authorAnderson JP
dc.contributor.authorAnupama GC
dc.contributor.authorIhanec N
dc.contributor.authorWalters R
dc.contributor.authorFremling C
dc.contributor.authorBarway S
dc.contributor.authorGraham MJ
dc.contributor.authorSchulze S
dc.contributor.authorSharma Y
dc.contributor.authorGalbany L
dc.contributor.authorYao YH
dc.contributor.authorSollerman J
dc.contributor.authorPursiainen M
dc.contributor.authorGromadzki M
dc.contributor.authorKumar H
dc.contributor.authorChen TW
dc.contributor.authorPerley DA
dc.contributor.authorWiseman P
dc.contributor.authorDuev DA
dc.date.accessioned2022-10-27T11:57:10Z
dc.date.available2022-10-27T11:57:10Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/156148
dc.description.abstractThe many unusual properties of the enigmatic AT2018cow suggested that at least some subset of the empirical class of fast blue optical transients (FBOTs) represents a genuinely new astrophysical phenomenon. Unfortunately, the intrinsic rarity and fleeting nature of these events have made it difficult to identify additional examples early enough to acquire the observations necessary to constrain theoretical models. We present here the Zwicky Transient Facility discovery of AT2020xnd (ZTF20acigmel, the 'Camel') at z = 0.243, the first unambiguous AT2018cow analogue to be found and confirmed in real time. AT2018cow and AT2020xnd share all key observational properties: a fast optical rise, sustained high photospheric temperature, absence of a second peak attributable to ejection of a radioactively heated stellar envelope, extremely luminous radio, millimetre, and X-ray emission, and a dwarf-galaxy host. This supports the argument that AT2018cow-like events represent a distinct phenomenon from slower-evolving radio-quiet supernovae, likely requiring a different progenitor or a different central engine. The sample properties of the four known members of this class to date disfavour tidal disruption models but are consistent with the alternative model of an accretion powered jet following the direct collapse of a massive star to a black hole. Contextual filtering of alert streams combined with rapid photometric verification using multiband imaging provides an efficient way to identify future members of this class, even at high redshift.
dc.language.isoen
dc.publisherOXFORD UNIV PRESS
dc.titleReal-time discovery of AT2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta
dc.identifier.urnURN:NBN:fi-fe2022012710583
dc.relation.volume508
dc.contributor.organizationfi=Suomen ESO-keskus, yhteiset|en=Finnish Centre for Astronomy with ESO - FINCA|
dc.contributor.organization-code2609700
dc.converis.publication-id67996791
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/67996791
dc.format.pagerange5147
dc.format.pagerange5138
dc.identifier.eissn1365-2966
dc.identifier.jour-issn0035-8711
dc.okm.affiliatedauthorGutierrez, Claudia
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.publisher.countryBritanniafi_FI
dc.publisher.countryUnited Kingdomen_GB
dc.publisher.country-codeGB
dc.relation.doi10.1093/mnras/stab2785
dc.relation.ispartofjournalMonthly Notices of the Royal Astronomical Society
dc.relation.issue4
dc.year.issued2021


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