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The Spectral Evolution of AT 2018dyb and the Presence of Metal Lines in Tidal Disruption Events

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cris.lastimport.scopus2024-02-12T20:56:52Z
dc.abstract.enWe present light curves and spectra of the tidal disruption event (TDE) ASASSN-18pg/AT 2018dyb spanning a period of one year. The event shows a plethora of strong emission lines, including the Balmer series, He II, He I, and metal lines of O III λ3760 and N III λλ4100, 4640 (blended with He II). The latter lines are consistent with originating from the Bowen fluorescence mechanism. By analyzing literature spectra of past events, we conclude that these lines are common in TDEs. The spectral diversity of optical TDEs is thus larger than previously thought and includes N-rich events besides H- and He-rich events. We study how the spectral lines evolve with time, by means of their width, relative strength, and velocity offsets. The velocity width of the lines starts at ˜13,000 km s<SUP>-1</SUP> and decreases with time. The ratio of He II to N III increases with time. The same is true for ASASSN-14li, which has a very similar spectrum to AT 2018dyb but its lines are narrower by a factor of >2. We estimate a black hole mass of M <SUB>BH</SUB> = {3.3}<SUB>-2.0</SUB><SUP>+5.0</SUP>× {10}<SUP>6</SUP> M <SUB>⊙</SUB> by using the M-σ relation. This is consistent with the black hole mass derived using the MOSFiT transient fitting code. The detection of strong Bowen lines in the optical spectrum is an indirect proof for extreme ultraviolet and (reprocessed) X-ray radiation and favors an accretion origin for the TDE optical luminosity. A model where photons escape after multiple scatterings through a super-Eddington thick disk and its optically thick wind, viewed at an angle close to the disk plane, is consistent with the observations.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorLeloudas, Giorgos
dc.contributor.authorDai, Lixin
dc.contributor.authorArcavi, Iair
dc.contributor.authorVreeswijk, Paul M.
dc.contributor.authorMockler, Brenna
dc.contributor.authorRoy, Rupak
dc.contributor.authorMalesani, Daniele B.
dc.contributor.authorSchulze, Steve
dc.contributor.authorWevers, Thomas
dc.contributor.authorFraser, Morgan
dc.contributor.authorRamirez-Ruiz, Enrico
dc.contributor.authorAuchettl, Katie
dc.contributor.authorBurke, Jamison
dc.contributor.authorCannizzaro, Giacomo
dc.contributor.authorCharalampopoulos, Panos
dc.contributor.authorChen, Ting-Wan
dc.contributor.authorCikota, Aleksandar
dc.contributor.authorValle, Massimo Della
dc.contributor.authorGalbany, Lluis
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorHeintz, Kasper E.
dc.contributor.authorHiramatsu, Daichi
dc.contributor.authorJonker, Peter G.
dc.contributor.authorKostrzewa-Rutkowska, Zuzanna
dc.contributor.authorMaguire, Kate
dc.contributor.authorMandel, Ilya
dc.contributor.authorNicholl, Matt
dc.contributor.authorOnori, Francesca
dc.contributor.authorRoth, Nathaniel
dc.contributor.authorSmartt, Stephen J.
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorYoung, Dave R.
dc.date.accessioned2024-01-26T10:47:58Z
dc.date.available2024-01-26T10:47:58Z
dc.date.copyright2019-03-07
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume887
dc.identifier.doi10.3847/1538-4357/AB5792
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123162
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...887..218L
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages218
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe Spectral Evolution of AT 2018dyb and the Presence of Metal Lines in Tidal Disruption Events
dc.typeJournalArticle
dspace.entity.typePublication