The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae
Previous numerical simulations of double-peaked Type IIb supernova (SN IIb) light curves have demonstrated that the radius and mass of the hydrogen-rich envelope of the progenitor star can significantly influence the brightness and timescale of the early-time light curve around the first peak. In th...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad08b5 |
| _version_ | 1797382491263205376 |
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| author | Seong Hyun Park Sung-Chul Yoon Sergei Blinnikov |
| author_facet | Seong Hyun Park Sung-Chul Yoon Sergei Blinnikov |
| author_sort | Seong Hyun Park |
| collection | DOAJ |
| description | Previous numerical simulations of double-peaked Type IIb supernova (SN IIb) light curves have demonstrated that the radius and mass of the hydrogen-rich envelope of the progenitor star can significantly influence the brightness and timescale of the early-time light curve around the first peak. In this study, we investigate how Thomson scattering and chemical mixing in the SN ejecta affect the optical light curves during the early stages of the SNe IIb using radiation hydrodynamics simulations. By comparing the results from two different numerical codes (i.e., STELLA and SNEC ), we find that the optical brightness of the first peak can be reduced by more than a factor of 3 as a result of the effect of Thomson scattering that causes the thermalization depth to be located below the Rosseland mean photosphere, compared to the corresponding case where this effect is ignored. We also observe a short-lived plateau-like feature lasting for a few days in the early-time optical light curves of our models, in contrast to typical observed SNe IIb that show a quasi-linear decrease in optical magnitudes after the first peak. A significant degree of chemical mixing between the hydrogen-rich envelope and the helium core in SN ejecta is required to reconcile this discrepancy between the model prediction and observation. Meanwhile, to properly reproduce the first peak, a significant mixing of ^56 Ni into the hydrogen-rich outermost layers should be restricted. Our findings indicate that inferring the SN IIb progenitor structure from a simplified approach that ignores these two factors may introduce substantial uncertainty. |
| first_indexed | 2024-03-08T21:07:08Z |
| format | Article |
| id | doaj.art-173b9738966347119425dcfbe4b2016d |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-08T21:07:08Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-173b9738966347119425dcfbe4b2016d2023-12-22T11:15:26ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0196016310.3847/1538-4357/ad08b5The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb SupernovaeSeong Hyun Park0https://orcid.org/0000-0001-7488-4337Sung-Chul Yoon1https://orcid.org/0000-0002-5847-8096Sergei Blinnikov2https://orcid.org/0000-0002-5726-538XDepartment of Physics and Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; rogersh0125@snu.ac.kr, scyoon@snu.ac.krDepartment of Physics and Astronomy, Seoul National University , Seoul 08826, Republic of Korea ; rogersh0125@snu.ac.kr, scyoon@snu.ac.kr; SNU Astronomy Research Center, Seoul National University , Seoul 08826, Republic of KoreaKKTEP, NRC Kurchatov Institute , Moscow 123182, Russia; Keldysh Institute of Applied Mathematics , Miusskaya pl., 4, 125047, Moscow, RussiaPrevious numerical simulations of double-peaked Type IIb supernova (SN IIb) light curves have demonstrated that the radius and mass of the hydrogen-rich envelope of the progenitor star can significantly influence the brightness and timescale of the early-time light curve around the first peak. In this study, we investigate how Thomson scattering and chemical mixing in the SN ejecta affect the optical light curves during the early stages of the SNe IIb using radiation hydrodynamics simulations. By comparing the results from two different numerical codes (i.e., STELLA and SNEC ), we find that the optical brightness of the first peak can be reduced by more than a factor of 3 as a result of the effect of Thomson scattering that causes the thermalization depth to be located below the Rosseland mean photosphere, compared to the corresponding case where this effect is ignored. We also observe a short-lived plateau-like feature lasting for a few days in the early-time optical light curves of our models, in contrast to typical observed SNe IIb that show a quasi-linear decrease in optical magnitudes after the first peak. A significant degree of chemical mixing between the hydrogen-rich envelope and the helium core in SN ejecta is required to reconcile this discrepancy between the model prediction and observation. Meanwhile, to properly reproduce the first peak, a significant mixing of ^56 Ni into the hydrogen-rich outermost layers should be restricted. Our findings indicate that inferring the SN IIb progenitor structure from a simplified approach that ignores these two factors may introduce substantial uncertainty.https://doi.org/10.3847/1538-4357/ad08b5Core-collapse supernovaeType II supernovae |
| spellingShingle | Seong Hyun Park Sung-Chul Yoon Sergei Blinnikov The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae The Astrophysical Journal Core-collapse supernovae Type II supernovae |
| title | The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae |
| title_full | The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae |
| title_fullStr | The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae |
| title_full_unstemmed | The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae |
| title_short | The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae |
| title_sort | effects of thomson scattering and chemical mixing on early time light curves of double peaked type iib supernovae |
| topic | Core-collapse supernovae Type II supernovae |
| url | https://doi.org/10.3847/1538-4357/ad08b5 |
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