Expanding the parameter space of 2002es-like type Ia supernovae: On the underluminous ASASSN-20jq/SN 2020qxp

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dc.catalogadorgjm
dc.contributor.authorBose, S.
dc.contributor.authorStritzinger, M. D.
dc.contributor.authorAshall, C.
dc.contributor.authorBaron, E.
dc.contributor.authorHoeflich, P.
dc.contributor.authorGalbany, L.
dc.contributor.authorHoogendam, W. B.
dc.contributor.authorJensen, E. A. M.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorPost, R. S.
dc.contributor.authorReguitti, A.
dc.contributor.authorElias-Rosa, N.
dc.contributor.authorStanek, K. Z.
dc.contributor.authorLundqvist, P.
dc.contributor.authorAuchettl, K.
dc.contributor.authorClocchiatti, Alejandro
dc.contributor.authorFiore, A.
dc.contributor.authorGutierrez, C. P.
dc.contributor.authorHinkle, J. T.
dc.contributor.authorHuber, M. E.
dc.contributor.authorde Jaeger, T.
dc.contributor.authorPastorello, A.
dc.contributor.authorPayne, A. V.
dc.contributor.authorPhillips, M.
dc.contributor.authorShappee, B. J.
dc.contributor.authorTucker, M. A.
dc.date.accessioned2025-11-21T15:08:18Z
dc.date.available2025-11-21T15:08:18Z
dc.date.issued2025
dc.description.abstractWe present optical photometric and spectroscopic observations of the peculiar Type Ia supernovae (SNe Ia) ASASSN-20jq/SN 2020qxp. It is a low-luminosity object, with a peak absolute magnitude of M-B = -17.1 +/- 0.5 mag, while its post-peak light-curve decline rate of Delta m(15)(B) = 1.35 +/- 0.09 mag and color-stretch parameter of s(BV) & gap; 0.82 is similar to that of normal luminosity SNe Ia. That makes it a prevalent outlier in both the SN Ia luminosity-width and the luminosity-color-stretch relations. The analysis of the early light curves indicates a possible "bump" during the first approximate to 1.4 days of explosion. ASASSN-20jq synthesized a low radioactive Ni-56 mass of 0.09 +/- 0.01 M-circle dot. The near-maximum light spectra of the supernova show strong Si II absorption lines, indicating a cooler photosphere than normal SNe Ia; however, it lacks Ti II absorption lines. Additionally, it shows unusually strong absorption features of O I lambda 7773 and the Ca II near-infrared triplet. The nebular spectra of ASASSN-20jq show a remarkably strong but narrow forbidden [Ca II] lambda lambda 7291, 7324 doublet emission that has not been seen in SNe Ia except for a handful of Type Iax events. There is also a marginal detection of the [O I] lambda lambda 6300, 6364 doublet emission in nebular spectra, which is extremely rare. Both the [Ca II] and [O I] lines are redshifted by roughly 2000 km s(-1). ASASSN-20jq also exhibits a strong [Fe II] lambda 7155 emission line with a tilted-top line profile, which is identical to the [Fe II] lambda 16433 line profile. The asymmetric [Fe II] line profiles, along with the redshifted [Ca II] and emission lines, suggest a high central density white dwarf progenitor that underwent an off-center delayed-detonation explosion mechanism, synthesizing roughly equal amounts of Ni-56 during the deflagration and detonation burning phases. The equal production of Ni-56 in both burning phases distinguishes ASASSN-20jq from normal bright and subluminous SNe Ia. Assuming this scenario, we simultaneously modeled the optical and near-infrared nebular spectra, achieving a good agreement with the observations. The light curve and spectroscopic features of ASASSN-20jq do not align with any single sub-class of SNe Ia. However, the significant deviation from the luminosity versus light-curve shape relations (along with several light-curve and spectroscopic features) exhibits similarities to some 2002es-like objects. Therefore, we have identified ASASSN-20jq as an extreme candidate within the broad and heterogeneous parameter space of 2002es-like SNe Ia.
dc.fechaingreso.objetodigital2025-11-21
dc.format.extent26 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202553687
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.scopusidSCOPUS_ID:105010145554
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202553687
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/107078
dc.identifier.wosidWOS:001522910200013
dc.information.autorucInstituto de Astrofísica; Clocchiatti, Alejandro; 0000-0003-3068-4258; 100500
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaASTRONOMY & ASTROPHYSICS
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectsupernovae: general
dc.subjectwhite dwarfs
dc.subjectsupernovae: individual: ASASSN-20jq
dc.subjectsupernovae: individual: SN2020qxp
dc.subjectgalaxies: individual: NGC 5002
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleExpanding the parameter space of 2002es-like type Ia supernovae: On the underluminous ASASSN-20jq/SN 2020qxp
dc.typeartículo
dc.volumen699
sipa.codpersvinculados100500
sipa.trazabilidadWOS;2025-07-19
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