Early-time spectroscopic modelling of the transitional Type Ia Supernova 2021rhu with tardis

被引：3

作者：

Harvey, L. ^{[1
]}

Maguire, K. ^{[1
]}

Magee, M. R. ^{[2
]}

Bulla, M. ^{[3
,4
]}

Dhawan, S. ^{[5
,6
]}

Schulze, S. ^{[4
]}

Sollerman, J. ^{[4
]}

Deckers, M. ^{[1
]}

Dimitriadis, G. ^{[1
]}

Reusch, S. ^{[7
,8
]}

Smith, M. ^{[9
]}

Terwel, J. ^{[1
,10
]}

Coughlin, M. W. ^{[11
]}

Masci, F. ^{[12
]}

Purdum, J. ^{[13
]}

Reedy, A. ^{[13
]}

Robert, E. ^{[9
]}

Wold, A. ^{[12
]}

机构：

[1] Univ Dublin, Trinity Coll Dublin, Sch Phys, Dublin, Ireland

[2] Univ Portsmouth, Inst Cosmol & Gravitat, Burnaby Rd, Portsmouth PO1 3FX, England

[3] Univ Ferrara, Dept Phys & Earth Sci, Via Saragat 1, I-44122 Ferrara, Italy

[4] Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden

[5] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[6] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[7] Deutsch Elekt Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany

[8] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[9] Univ Lyon, Univ Claude Bernard Lyon 1, CNRS IN2P3, IP2I Lyon, F-69622 Lyon, France

[10] Isaac Newton Grp ING, Apt de correos 321, E-38700 Santa Cruz de La Palma, Spain

[11] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[12] CALTECH, IPAC, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[13] CALTECH, Caltech Opt Observ, Pasadena, CA 91125 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 522卷 / 03期

基金：

欧盟地平线“2020”; 欧洲研究理事会; 美国国家科学基金会; 瑞典研究理事会;

关键词：

techniques: spectroscopic; transients: supernovae; WHITE-DWARF MODELS; ABUNDANCE STRATIFICATION; DOUBLE DETONATIONS; SN; 2011FE; DIFFERENT CORE; DISTANCE; SPECTROGRAPH; SPECTRA; HELIUM; 1991BG;

D O I：

10.1093/mnras/stad1226

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An open question in SN Ia research is where the boundary lies between 'normal' Type Ia supernovae (SNe Ia) that are used in cosmological measurements and those that sit off the Phillips relation. We present the spectroscopic modelling of one such '86G-like' transitional SN Ia, SN 2021rhu, that has recently been employed as a local Hubble Constant calibrator using a tip of the red-giant branch measurement. We detail its modelling from -12 d until maximum brightness using the radiative-transfer spectral-synthesis code tardis. Please check and correct this paper accordingly. We base our modelling on literature delayed-detonation and deflagration models of Chandrasekhar mass white dwarfs, as well as the double-detonation models of sub-Chandrasekhar mass white dwarfs. We present a new method for 'projecting' abundance profiles to different density profiles for ease of computation. Due to the small velocity extent and low outer densities of the W7 profile, we find it inadequate to reproduce the evolution of SN 2021rhu as it fails to match the high-velocity calcium components. The host extinction of SN 2021rhu is uncertain but we use modelling with and without an extinction correction to set lower and upper limits on the abundances of individual species. Comparing these limits to literature models we conclude that the spectral evolution of SN 2021rhu is also incompatible with double-detonation scenarios, lying more in line with those resulting from the delayed-detonation mechanism (although there are some discrepancies, in particular a larger titanium abundance in SN 2021rhu compared to the literature). This suggests that SN 2021rhu is likely a lower luminosity, and hence lower temperature, version of a normal SN Ia.

引用

页码：4444 / 4467

页数：24

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