Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions

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dc.contributor.authorCai, Y.-Z.
dc.contributor.authorPastorello, A.
dc.contributor.authorFraser, M.
dc.contributor.authorBotticella, M. T.
dc.contributor.authorElias-Rosa, N.
dc.contributor.authorWang, L.-Z.
dc.contributor.authorKotak, R.
dc.contributor.authorBenetti, S.
dc.contributor.authorCappellaro, E.
dc.contributor.authorTuratto, M.
dc.contributor.authorReguitti, A.
dc.contributor.authorMattila, S.
dc.contributor.authorSmartt, S. J.
dc.contributor.authorAshall, C.
dc.contributor.authorBenitez, S.
dc.contributor.authorChen, T.-W.
dc.contributor.authorHarutyunyan, A.
dc.contributor.authorKankare, E.
dc.contributor.authorLundqvist, P.
dc.contributor.authorMazzali, P. A.
dc.contributor.authorMorales-Garoffolo, A.
dc.contributor.authorOchner, P.
dc.contributor.authorPignata, G.
dc.contributor.authorPrentice, S. J.
dc.contributor.authorReynolds, T. M.
dc.contributor.authorShu, X.-W.
dc.contributor.authorStritzinger, M. D.
dc.contributor.authorTartaglia, L.
dc.contributor.authorTerreran, G.
dc.contributor.authorTomasella, L.
dc.contributor.authorValenti, S.
dc.contributor.authorValerin, G.
dc.contributor.authorWang, G.-J.
dc.contributor.authorWang, X.-F.
dc.contributor.authorBorsato, L.
dc.contributor.authorCallis, E.
dc.contributor.authorCannizzaro, G.
dc.contributor.authorChen, S.
dc.contributor.authorCongiu, E.
dc.contributor.authorErgon, M.
dc.contributor.authorGalbany, L.
dc.contributor.authorGal-Yam, A.
dc.contributor.authorGao, X.
dc.contributor.authorGromadzki, M.
dc.contributor.authorHolmbo, S.
dc.contributor.authorHuang, F.
dc.contributor.authorInserra, C.
dc.contributor.authorItagaki, K.
dc.contributor.authorKostrzewa-Rutkowska, Z.
dc.contributor.authorMaguire, K.
dc.contributor.authorMargheim, S.
dc.contributor.authorMoran, S.
dc.contributor.authorOnori, F.
dc.contributor.authorSagués Carracedo, A.
dc.contributor.authorSmith, K. W.
dc.contributor.authorSollerman, J.
dc.contributor.authorSomero, A.
dc.contributor.authorWang, B.
dc.contributor.authorYoung, D. R.
dc.date.accessioned2022-06-14T16:09:27Z
dc.date.available2022-06-14T16:09:27Z
dc.date.issued2021-10-01
dc.descriptionIndexación Scopuses
dc.description.abstractWe present the spectroscopic and photometric study of five intermediate-luminosity red transients (ILRTs), namely AT 2010dn, AT 2012jc, AT 2013la, AT 2013lb, and AT 2018aes. They share common observational properties and belong to a family of objects similar to the prototypical ILRT SN 2008S. These events have a rise time that is less than 15 days and absolute peak magnitudes of between-11.5 and-14.5 mag. Their pseudo-bolometric light curves peak in the range 0.5-9.0 × 1040 erg s-1 and their total radiated energies are on the order of (0.3-3) × 1047 erg. After maximum brightness, the light curves show a monotonic decline or a plateau, resembling those of faint supernovae IIL or IIP, respectively. At late phases, the light curves flatten, roughly following the slope of the 56Co decay. If the late-time power source is indeed radioactive decay, these transients produce 56Ni masses on the order of 10-4 to 10-3 M⊙. The spectral energy distribution of our ILRT sample, extending from the optical to the mid-infrared (MIR) domain, reveals a clear IR excess soon after explosion and non-negligible MIR emission at very late phases. The spectra show prominent H lines in emission with a typical velocity of a few hundred km s-1, along with Ca II features. In particular, the [Ca II] λ7291,7324 doublet is visible at all times, which is a characteristic feature for this family of transients. The identified progenitor of SN 2008S, which is luminous in archival Spitzer MIR images, suggests an intermediate-mass precursor star embedded in a dusty cocoon. We propose the explosion of a super-asymptotic giant branch star forming an electron-capture supernova as a plausible explanation for these events.en
dc.identifier.citationAstronomy and Astrophysics Volume 6541 October 2021 Article number A157en
dc.identifier.doi10.1051/0004-6361/202141078
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/22818
dc.language.isoenes
dc.publisherEDP Sciencesen
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectStars: AGB and post-AGBen
dc.subjectStars: Mass-lossen
dc.subjectSupernovae: Generalen
dc.titleIntermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosionsen
dc.typeArtículoen
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