Artykuł w czasopiśmie
Brak miniatury
Licencja
 

Strongly Bipolar Inner Ejecta of the Normal Type IIP Supernova ASASSN-16at

Uproszczony widok
dc.abstract.enWe report distinctly double-peaked Hα and Hβ emission lines in the late-time, nebular-phase spectra (≳200 days) of the otherwise normal at early phases (≲100 days) type IIP supernova ASASSN-16at (SN 2016X). Such distinctly double-peaked nebular Balmer lines have never been observed for a type II SN. The nebular-phase Balmer emission is driven by the radioactive <SUP>56</SUP>Co decay, so the observed line profile bifurcation suggests a strong bipolarity in the <SUP>56</SUP>Ni distribution or in the line-forming region of the inner ejecta. The strongly bifurcated blueshifted and redshifted peaks are separated by ˜3 × 10<SUP>3</SUP> km s<SUP>-1</SUP> and are roughly symmetrically positioned with respect to the host-galaxy rest frame, implying that the inner ejecta are composed of two almost-detached blobs. The red peak progressively weakens relative to the blue peak, and disappears in the 740 days spectrum. One possible reason for the line-ratio evolution is increasing differential extinction from continuous formation of dust within the envelope, which is also supported by the near-infrared flux excess that develops after ˜100 days.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBose, Subhash
dc.contributor.authorDong, Subo
dc.contributor.authorElias-Rosa, N.
dc.contributor.authorShappee, B. J.
dc.contributor.authorBersier, David
dc.contributor.authorBenetti, Stefano
dc.contributor.authorStritzinger, M. D.
dc.contributor.authorGrupe, D.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorPrieto, J. L.
dc.contributor.authorChen, Ping
dc.contributor.authorKuncarayakti, H.
dc.contributor.authorMattila, Seppo
dc.contributor.authorMorales-Garoffolo, Antonia
dc.contributor.authorMorrell, Nidia
dc.contributor.authorOnori, F.
dc.contributor.authorReynolds, Thomas M.
dc.contributor.authorSiviero, A.
dc.contributor.authorSomero, Auni
dc.contributor.authorStanek, K. Z.
dc.contributor.authorTerreran, Giacomo
dc.contributor.authorThompson, Todd A.
dc.contributor.authorTomasella, L.
dc.contributor.authorAshall, C.
dc.contributor.authorGall, Christa
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorHoloien, T. W. -S.
dc.date.accessioned2024-01-26T08:20:47Z
dc.date.available2024-01-26T08:20:47Z
dc.date.copyright2018-10-29
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume873
dc.identifier.doi10.3847/2041-8213/AB0558
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120848
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...873L...3B
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL3
dc.rightsOther
dc.sciencecloudnosend
dc.titleStrongly Bipolar Inner Ejecta of the Normal Type IIP Supernova ASASSN-16at
dc.typeJournalArticle
dspace.entity.typePublication