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The Rise and Fall of ASASSN-18pg: Following a TDE from Early to Late Times

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cris.lastimport.scopus2024-02-12T19:44:14Z
dc.abstract.enWe present nearly 500 days of observations of the tidal disruption event (TDE) ASASSN-18pg, spanning from 54 days before peak light to 441 days after peak light. Our data set includes X-ray, UV, and optical photometry, optical spectroscopy, radio observations, and the first published spectropolarimetric observations of a TDE. ASASSN-18pg was discovered on 2018 July 11 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d = 78.6 Mpc; with a peak UV magnitude of m ≃ 14, it is both one of the nearest and brightest TDEs discovered to-date. The photometric data allow us to track both the rise to peak and the long-term evolution of the TDE. ASASSN-18pg peaked at a luminosity of L ≃ 2.4 × 10<SUP>44</SUP> erg s<SUP>-1</SUP>, and its late-time evolution is shallower than a flux ∝t<SUP>-5/3</SUP> power-law model, similar to what has been seen in other TDEs. ASASSN-18pg exhibited Balmer lines and spectroscopic features consistent with Bowen fluorescence prior to peak, which remained detectable for roughly 225 days after peak. Analysis of the two-component Hα profile indicates that, if they are the result of reprocessing of emission from the accretion disk, the different spectroscopic lines may be coming from regions between ˜10 and ˜60 lt-days from the black hole. No X-ray emission is detected from the TDE, and there is no evidence of a jet or strong outflow detected in the radio. Our spectropolarimetric observations indicate that the projected emission region is likely not significantly aspherical, with the projected emission region having an axis ratio of ≳0.65.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorHoloien, Thomas W. -S.
dc.contributor.authorAuchettl, Katie
dc.contributor.authorTucker, Michael A.
dc.contributor.authorShappee, Benjamin J.
dc.contributor.authorPatel, Shannon G.
dc.contributor.authorMiller-Jones, James C. A.
dc.contributor.authorMockler, Brenna
dc.contributor.authorGroenewald, Danièl N.
dc.contributor.authorHinkle, Jason T.
dc.contributor.authorBrown, Jonathan S.
dc.contributor.authorKochanek, Christopher S.
dc.contributor.authorStanek, K. Z.
dc.contributor.authorChen, Ping
dc.contributor.authorDong, Subo
dc.contributor.authorPrieto, Jose L.
dc.contributor.authorThompson, Todd A.
dc.contributor.authorBeaton, Rachael L.
dc.contributor.authorConnor, Thomas
dc.contributor.authorCowperthwaite, Philip S.
dc.contributor.authorDahmen, Linnea
dc.contributor.authorFrench, K. Decker
dc.contributor.authorMorrell, Nidia
dc.contributor.authorBuckley, David A. H.
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorRoy, Rupak
dc.contributor.authorCoulter, David A.
dc.contributor.authorDimitriadis, Georgios
dc.contributor.authorFoley, Ryan J.
dc.contributor.authorKilpatrick, Charles D.
dc.contributor.authorPiro, Anthony L.
dc.contributor.authorRojas-Bravo, César
dc.contributor.authorSiebert, Matthew R.
dc.contributor.authorVelzen, Sjoert van
dc.date.accessioned2024-01-26T10:37:35Z
dc.date.available2024-01-26T10:37:35Z
dc.date.copyright2020-03-30
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume898
dc.identifier.doi10.3847/1538-4357/AB9F3D
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/122996
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020ApJ...898..161H
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages161
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe Rise and Fall of ASASSN-18pg: Following a TDE from Early to Late Times
dc.typeJournalArticle
dspace.entity.typePublication