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Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova

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Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova. / Kwok, Lindsey; Siebert, Matthew; Johansson, Joel et al.
In: The Astrophysical Journal, Vol. 966, No. 1, 135, 30.04.2024.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Kwok, L, Siebert, M, Johansson, J, Jha, SW, Blondin, S, Dessart, L, Foley, R, Hillier, DJ, Larison, C, Pakmor, R, Temim, T, Andrews, JE, Auchettl, K, Badenes, C, Barna, B, Bostroem, KA, Newman, MJB, Brink, TG, Rosell, MJB, Camacho-Neves, Y, Clocchiatti, A, Coulter, D, Davis, K, Deckers, M, Dimitriadis, G, Dong, Y, Farah, JR, Filippenko, A, Flörs, A, Fox, O, Garnavich, P, Gonzalez, EP, Graur, O, Hambsch, F-J, Hosseinzadeh, G, Howell, DA, Hughes, JP, Kerzendorf, W, Saux, XL, Maeda, K, Maguire, K, McCully, C, Mihalenko, C, Newsome, M, O'Brien, J, Pearson, J, Pellegrino, C, Pierel, JR, Polin, A, Rest, A, Rojas-Bravo, C, Sand, D, Schwab, M, Shahbandeh, M, Shrestha, M, Smith, N, Strolger, L-G, Szalai, T, Taggart, K, Terreran, G, Terwel, J, Tinyanont, S, VALENTI, S, Vinko, J, Wheeler, JC, Yang, Y, Zheng, W, Ashall, C, DerKacy, JM, Galbany, L, Hoeflich, P, de Jaeger, T, Lu, J, Maund, J, Medler, K, Morrell, NI, Shappee, B, Stritzinger, M, Suntzeff, NB, Tucker, M & Wang, L 2024, 'Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova', The Astrophysical Journal, vol. 966, no. 1, 135. https://doi.org/10.3847/1538-4357/ad2c0d

APA

Kwok, L., Siebert, M., Johansson, J., Jha, S. W., Blondin, S., Dessart, L., Foley, R., Hillier, D. J., Larison, C., Pakmor, R., Temim, T., Andrews, J. E., Auchettl, K., Badenes, C., Barna, B., Bostroem, K. A., Newman, M. J. B., Brink, T. G., Rosell, M. J. B., ... Wang, L. (2024). Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova. The Astrophysical Journal, 966(1), Article 135. https://doi.org/10.3847/1538-4357/ad2c0d

Vancouver

Kwok L, Siebert M, Johansson J, Jha SW, Blondin S, Dessart L et al. Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova. The Astrophysical Journal. 2024 Apr 30;966(1):135. doi: 10.3847/1538-4357/ad2c0d

Author

Kwok, Lindsey ; Siebert, Matthew ; Johansson, Joel et al. / Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova. In: The Astrophysical Journal. 2024 ; Vol. 966, No. 1.

Bibtex

@article{82b1ad6e5cd6456599886219d4ce2645,
title = "Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova",
abstract = "We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar {"}03fg-like{"} (or {"}super-Chandrasekhar{"}) Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously covers 0.4–14 μm and includes the first mid-infrared spectrum of a 03fg-like SN Ia. Compared to normal SN Ia 2021aefx, SN 2022pul exhibits a lower mean ionization state, asymmetric emission-line profiles, stronger emission from the intermediate-mass elements (IMEs) argon and calcium, weaker emission from iron-group elements (IGEs), and the first unambiguous detection of neon in a SN Ia. A strong, broad, centrally peaked [Ne ii] line at 12.81 μm was previously predicted as a hallmark of {"}violent merger{"} SN Ia models, where dynamical interaction between two sub-MCh white dwarfs (WDs) causes disruption of the lower-mass WD and detonation of the other. The violent merger scenario was already a leading hypothesis for 03fg-like SNe Ia; in SN 2022pul it can explain the large-scale ejecta asymmetries seen between the IMEs and IGEs and the central location of narrow oxygen and broad neon. We modify extant models to add clumping of the ejecta to reproduce the optical iron emission better, and add mass in the innermost region (<2000 km s−1) to account for the observed narrow [O i] λλ6300, 6364 emission. A violent WD–WD merger explains many of the observations of SN 2022pul, and our results favor this model interpretation for the subclass of 03fg-like SNe Ia.",
author = "Lindsey Kwok and Matthew Siebert and Joel Johansson and Jha, {Saurabh W} and St{\'e}phane Blondin and Luc Dessart and Ryan Foley and Hillier, {Desmond John} and Conor Larison and Ruediger Pakmor and Tea Temim and J.E. Andrews and Katie Auchettl and Carles Badenes and Barnab{\'a}s Barna and Bostroem, {K. Azalee} and Newman, {Max J. B.} and Brink, {Thomas G.} and Rosell, {Mar{\'i}a Jos{\'e} Bustamante} and Yssavo Camacho-Neves and Alejandro Clocchiatti and David Coulter and Kyle Davis and Maxime Deckers and Georgios Dimitriadis and Yize Dong and Farah, {Joseph R.} and Alexei Filippenko and Andreas Fl{\"o}rs and Ori Fox and Peter Garnavich and Gonzalez, {Estefania Padilla} and Or Graur and Franz-Josef Hambsch and Griffin Hosseinzadeh and Howell, {D. Andrew} and Hughes, {John P.} and Wolfgang Kerzendorf and Saux, {Xavier Le} and Keiichi Maeda and Kate Maguire and Curtis McCully and Cassidy Mihalenko and Megan Newsome and John O'Brien and Jeniveve Pearson and Craig Pellegrino and Pierel, {Justin R.} and Abigail Polin and Armin Rest and Cesar Rojas-Bravo and David Sand and Michaela Schwab and Melissa Shahbandeh and Manisha Shrestha and Nathan Smith and Louis-Gregory Strolger and Tamas Szalai and Kirsty Taggart and Giacomo Terreran and Jacco Terwel and Samaporn Tinyanont and Stefano VALENTI and Jozsef Vinko and Wheeler, {J. Craig} and Yi Yang and Weikang Zheng and Chris Ashall and DerKacy, {James M} and Llu{\'i}s Galbany and Peter Hoeflich and {de Jaeger}, Thomas and Jing Lu and Justyn Maund and Kyle Medler and Morrell, {Nidia Irene} and Benjamin Shappee and Maximilian Stritzinger and Suntzeff, {Nicholas B.} and Michael Tucker and Lifan Wang",
year = "2024",
month = apr,
day = "30",
doi = "10.3847/1538-4357/ad2c0d",
language = "English",
volume = "966",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing",
number = "1",

}

RIS

TY - JOUR

T1 - Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova

AU - Kwok, Lindsey

AU - Siebert, Matthew

AU - Johansson, Joel

AU - Jha, Saurabh W

AU - Blondin, Stéphane

AU - Dessart, Luc

AU - Foley, Ryan

AU - Hillier, Desmond John

AU - Larison, Conor

AU - Pakmor, Ruediger

AU - Temim, Tea

AU - Andrews, J.E.

AU - Auchettl, Katie

AU - Badenes, Carles

AU - Barna, Barnabás

AU - Bostroem, K. Azalee

AU - Newman, Max J. B.

AU - Brink, Thomas G.

AU - Rosell, María José Bustamante

AU - Camacho-Neves, Yssavo

AU - Clocchiatti, Alejandro

AU - Coulter, David

AU - Davis, Kyle

AU - Deckers, Maxime

AU - Dimitriadis, Georgios

AU - Dong, Yize

AU - Farah, Joseph R.

AU - Filippenko, Alexei

AU - Flörs, Andreas

AU - Fox, Ori

AU - Garnavich, Peter

AU - Gonzalez, Estefania Padilla

AU - Graur, Or

AU - Hambsch, Franz-Josef

AU - Hosseinzadeh, Griffin

AU - Howell, D. Andrew

AU - Hughes, John P.

AU - Kerzendorf, Wolfgang

AU - Saux, Xavier Le

AU - Maeda, Keiichi

AU - Maguire, Kate

AU - McCully, Curtis

AU - Mihalenko, Cassidy

AU - Newsome, Megan

AU - O'Brien, John

AU - Pearson, Jeniveve

AU - Pellegrino, Craig

AU - Pierel, Justin R.

AU - Polin, Abigail

AU - Rest, Armin

AU - Rojas-Bravo, Cesar

AU - Sand, David

AU - Schwab, Michaela

AU - Shahbandeh, Melissa

AU - Shrestha, Manisha

AU - Smith, Nathan

AU - Strolger, Louis-Gregory

AU - Szalai, Tamas

AU - Taggart, Kirsty

AU - Terreran, Giacomo

AU - Terwel, Jacco

AU - Tinyanont, Samaporn

AU - VALENTI, Stefano

AU - Vinko, Jozsef

AU - Wheeler, J. Craig

AU - Yang, Yi

AU - Zheng, Weikang

AU - Ashall, Chris

AU - DerKacy, James M

AU - Galbany, Lluís

AU - Hoeflich, Peter

AU - de Jaeger, Thomas

AU - Lu, Jing

AU - Maund, Justyn

AU - Medler, Kyle

AU - Morrell, Nidia Irene

AU - Shappee, Benjamin

AU - Stritzinger, Maximilian

AU - Suntzeff, Nicholas B.

AU - Tucker, Michael

AU - Wang, Lifan

PY - 2024/4/30

Y1 - 2024/4/30

N2 - We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar "03fg-like" (or "super-Chandrasekhar") Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously covers 0.4–14 μm and includes the first mid-infrared spectrum of a 03fg-like SN Ia. Compared to normal SN Ia 2021aefx, SN 2022pul exhibits a lower mean ionization state, asymmetric emission-line profiles, stronger emission from the intermediate-mass elements (IMEs) argon and calcium, weaker emission from iron-group elements (IGEs), and the first unambiguous detection of neon in a SN Ia. A strong, broad, centrally peaked [Ne ii] line at 12.81 μm was previously predicted as a hallmark of "violent merger" SN Ia models, where dynamical interaction between two sub-MCh white dwarfs (WDs) causes disruption of the lower-mass WD and detonation of the other. The violent merger scenario was already a leading hypothesis for 03fg-like SNe Ia; in SN 2022pul it can explain the large-scale ejecta asymmetries seen between the IMEs and IGEs and the central location of narrow oxygen and broad neon. We modify extant models to add clumping of the ejecta to reproduce the optical iron emission better, and add mass in the innermost region (<2000 km s−1) to account for the observed narrow [O i] λλ6300, 6364 emission. A violent WD–WD merger explains many of the observations of SN 2022pul, and our results favor this model interpretation for the subclass of 03fg-like SNe Ia.

AB - We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar "03fg-like" (or "super-Chandrasekhar") Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously covers 0.4–14 μm and includes the first mid-infrared spectrum of a 03fg-like SN Ia. Compared to normal SN Ia 2021aefx, SN 2022pul exhibits a lower mean ionization state, asymmetric emission-line profiles, stronger emission from the intermediate-mass elements (IMEs) argon and calcium, weaker emission from iron-group elements (IGEs), and the first unambiguous detection of neon in a SN Ia. A strong, broad, centrally peaked [Ne ii] line at 12.81 μm was previously predicted as a hallmark of "violent merger" SN Ia models, where dynamical interaction between two sub-MCh white dwarfs (WDs) causes disruption of the lower-mass WD and detonation of the other. The violent merger scenario was already a leading hypothesis for 03fg-like SNe Ia; in SN 2022pul it can explain the large-scale ejecta asymmetries seen between the IMEs and IGEs and the central location of narrow oxygen and broad neon. We modify extant models to add clumping of the ejecta to reproduce the optical iron emission better, and add mass in the innermost region (<2000 km s−1) to account for the observed narrow [O i] λλ6300, 6364 emission. A violent WD–WD merger explains many of the observations of SN 2022pul, and our results favor this model interpretation for the subclass of 03fg-like SNe Ia.

U2 - 10.3847/1538-4357/ad2c0d

DO - 10.3847/1538-4357/ad2c0d

M3 - Journal article

VL - 966

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 135

ER -