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Progenitor, precursor, and evolution of the dusty remnant of the stellar merger M31-LRN-2015

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cris.lastimport.scopus2024-02-12T19:33:58Z
dc.abstract.enM31-LRN-2015 is a likely stellar merger discovered in the Andromeda Galaxy in 2015. We present new optical to mid-infrared photometry and optical spectroscopy for this event. Archival data show that the source started to brighten ˜2 yr before the nova event. During this precursor phase, the source brightened by ˜3 mag. The light curve at 6 and 1.5 months before the main outburst may show periodicity, with periods of 16 ± 0.3 and 28.1 ± 1.4 d, respectively. This complex emission may be explained by runaway mass-loss from the system after the binary undergoes Roche lobe overflow, leading the system to coalesce in tens of orbital periods. While the progenitor spectral energy distribution shows no evidence of pre-existing warm dust in the system, the remnant forms an optically thick dust shell at approximately four months after the outburst peak. The optical depth of the shell increases dramatically after 1.5 yr, suggesting the existence of shocks that enhance the dust formation process. We propose that the merger remnant is likely an inflated giant obscured by a cooling shell of gas with mass ˜0.2 M<SUB>⊙</SUB> ejected at the onset of the common envelope phase.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBlagorodnova, N.
dc.contributor.authorKarambelkar, V.
dc.contributor.authorAdams, S. M.
dc.contributor.authorKasliwal, M. M.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorDong, S.
dc.contributor.authorCampbell, H.
dc.contributor.authorHodgkin, S.
dc.contributor.authorJencson, J. E.
dc.contributor.authorJohansson, J.
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorLaher, R. R.
dc.contributor.authorMasci, F.
dc.contributor.authorNugent, P.
dc.contributor.authorRebbapragada, U.
dc.date.accessioned2024-01-25T18:08:28Z
dc.date.available2024-01-25T18:08:28Z
dc.date.copyright2020-04-09
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number4
dc.description.versionORIGINAL_AUTHOR
dc.description.volume496
dc.identifier.doi10.1093/MNRAS/STAA1872
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/117179
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020MNRAS.496.5503B
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages5503-5517
dc.rightsOther
dc.sciencecloudnosend
dc.titleProgenitor, precursor, and evolution of the dusty remnant of the stellar merger M31-LRN-2015
dc.typeJournalArticle
dspace.entity.typePublication