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Browsing by Author "Rest, Armin"

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    A JWST Near- and Mid-infrared Nebular Spectrum of the Type Ia Supernova 2021aefx
    Kwok, Lindsey A.; Jha, Saurabh W.; Temim, Tea; Fox, Ori D.; Larison, Conor; Camacho-Neves, Yssavo; Brenner Newman, Max J.; Pierel, Justin D. R.; Foley, Ryan J.; Andrews, Jennifer E.; Badenes, Carles; Barna, Barnabas; Bostroem, K. Azalee; Deckers, Maxime; Floers, Andreas; Garnavich, Peter; Graham, Melissa L.; Graur, Or; Hosseinzadeh, Griffin; Howell, D. Andrew; Hughes, John P.; Johansson, Joel; Kendrew, Sarah; Kerzendorf, Wolfgang E.; Maeda, Keiichi; Maguire, Kate; McCully, Curtis; O'Brien, John T.; Rest, Armin; Sand, David J.; Shahbandeh, Melissa; Strolger, Louis-Gregory; Szalai, Tamas; Ashall, Chris; Baron, E.; Burns, Chris R.; DerKacy, James M.; Evans, Tyco Mera; Fisher, Alec; Galbany, Lluis; Hoeflich, Peter; Hsiao, Eric; de Jaeger, Thomas; Karamehmetoglu, Emir; Krisciunas, Kevin; Kumar, Sahana; Lu, Jing; Maund, Justyn; Mazzali, Paolo A.; Medler, Kyle; Morrell, Nidia; Phillips, Mark. M.; Shappee, Benjamin J.; Stritzinger, Maximilian; Suntzeff, Nicholas; Telesco, Charles; Tucker, Michael; Wang, Lifan (IOP Publishing, 2023-02)
    We present JWST near-infrared (NIR) and mid-infrared (MIR) spectroscopic observations of the nearby normal Type Ia supernova (SN) SN 2021aefx in the nebular phase at +255 days past maximum light. Our Near Infrared Spectrograph (NIRSpec) and Mid Infrared Instrument observations, combined with ground-based optical data from the South African Large Telescope, constitute the first complete optical+NIR+MIR nebular SN Ia spectrum covering 0.3-14 mu m. This spectrum unveils the previously unobserved 2.5-5 mu m region, revealing strong nebular iron and stable nickel emission, indicative of high-density burning that can constrain the progenitor mass. The data show a significant improvement in sensitivity and resolution compared to previous Spitzer MIR data. We identify numerous NIR and MIR nebular emission lines from iron-group elements as well as lines from the intermediate-mass element argon. The argon lines extend to higher velocities than the iron-group elements, suggesting stratified ejecta that are a hallmark of delayed-detonation or double-detonation SN Ia models. We present fits to simple geometric line profiles to features beyond 1.2 mu m and find that most lines are consistent with Gaussian or spherical emission distributions, while the [Ar iii] 8.99 mu m line has a distinctively flat-topped profile indicating a thick spherical shell of emission. Using our line profile fits, we investigate the emissivity structure of SN 2021aefx and measure kinematic properties. Continued observations of SN 2021aefx and other SNe Ia with JWST will be transformative to the study of SN Ia composition, ionization structure, density, and temperature, and will provide important constraints on SN Ia progenitor and explosion models.
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    Revealing the Progenitor of SN 2021zby through Analysis of the TESS Shock-cooling Light Curve
    Wang, Qinan; Armstrong, Patrick; Zenati, Yossef; Ridden-Harper, Ryan; Rest, Armin; Arcavi, Iair; Kilpatrick, Charles D.; Foley, Ryan J.; Tucker, Brad E.; Lidman, Chris; Killestein, Thomas L.; Shahbandeh, Melissa; Anderson, Joseph P.; Angulo, Rodrigo; Ashall, Chris; Burke, Jamison; Chen, Ting-Wan; von Coelln, Sophie; Dalrymple, Kyle A.; Davis, Kyle W.; Fulton, Michael D.; Galbany, Lluis; Gonzalez, Estefania Padilla; Gao, Bore; Gromadzki, Mariusz; Howell, D. Andrew; Ihanec, Nada; Jencson, Jacob E.; Jones, David O.; Lyman, Joseph D.; McCully, Curtis; Muller-Bravo, Tomas E.; Newsome, Megan; Nicholl, Matt; O'Neill, David; Pellegrino, Craig; Rest, Sofia; Smartt, Stephen J.; Smith, Ken; Srivastav, Shubham; Terreran, Giacomo; Tinyanont, Samaporn; Young, David R.; Zenteno, Alfredo (IOP Publishing, 2023-02-01)
    We present early observations and analysis of the double-peaked Type IIb supernova (SN IIb) SN 2021zby. TESS captured the prominent early shock-cooling peak of SN 2021zby within the first similar to 10 days after explosion with a 30 minute cadence. We present optical and near-infrared spectral series of SN 2021zby, including three spectra during the shock-cooling phase. Using a multiband model fit, we find that the inferred properties of its progenitor are consistent with a red supergiant or yellow supergiant, with an envelope mass of similar to 0.30-0.65 M-circle dot and an envelope radius of similar to 120-300 R-circle dot. These inferred progenitor properties are similar to those of other SNe IIb with a double-peaked feature, such as SNe 1993J, 2011dh, 2016gkg, and 2017jgh. This study further validates the importance of the high cadence and early coverage in resolving the shape of the shock-cooling light curve, while the multiband observations, particularly UV, are also necessary to fully constrain the progenitor properties.