Browsing by Author "Jha, Saurabh W."

Now showing 1 - 5 of 5
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    Deep drilling in the time domain with DECam: survey characterization
    (2023) Graham, Melissa L.; Knop, Robert A.; Kennedy, Thomas D.; Nugent, Peter E.; Bellm, Eric; Catelan, Márcio; Patel, Avi; Smotherman, Hayden; Soraisam, Monika; Stetzler, Steven; Aldoroty, Lauren N.; Awbrey, Autumn; Baeza-Villagra, Karina; Bernardinelli, Pedro H.; Federica Bianco, Federica; Brout, Dillon; Clarke, Riley; Clarkson, William I.; Collett, Thomas; Davenport, James R.; Fu, Shenming; Gizis, John E.; Heinze, Ari; Hu, Lei; Jha, Saurabh W.; Jurić, Mario; Kalmbach, J. Bryce; Kim, Alex; Lee, Chien-Hsiu; Lidman, Chris; Magee, Mark; Martínez-Vázquez, Clara E.; Matheson, Thomas; Narayan, Gautham; Palmese, Antonella; Phillips, Christopher A.; Rabus, Markus; Rest, Armin; Rodríguez-Segovia, Nicolás; Street, Rachel; Vivas, A. Katherina; Wang, Lifan; Wolf, Nicholas; Yang, Jiawen
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    Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova
    (2024) Siebert, Matthew R.; Kwok, Lindsey A.; Johansson, Joel; Jha, Saurabh W.; Blondin, Stephane; Dessart, Luc; Foley, Ryan J.; Hillier, D. John; Larison, Conor; Pakmor, Ruediger; Temim, Tea; Andrews, Jennifer E.; Auchettl, Katie; Badenes, Carles; Barna, Barnabas; Bostroem, K. Azalee; Brenner Newman, Max J.; Brink, Thomas G.; Bustamante-Rosell, Maria Jose; Camacho-Neves, Yssavo; Clocchiatti, Alejandro; Coulter, David A.; Davis, Kyle W.; Deckers, Maxime; Dimitriadis, Georgios; Dong, Yize; Farah, Joseph; Filippenko, Alexei V.; Floers, Andreas; Fox, Ori D.; Garnavich, Peter; Gonzalez, Estefania Padilla; Graur, Or; Hambsch, Franz-Josef; Hosseinzadeh, Griffin; Howell, D. Andrew; Hughes, John P.; Kerzendorf, Wolfgang E.; Le Saux, Xavier K.; Maeda, Keiichi; Maguire, Kate; McCully, Curtis; Mihalenko, Cassidy; Newsome, Megan; O'Brien, John T.; Pearson, Jeniveve; Pellegrino, Craig; Pierel, Justin D. R.; Polin, Abigail; Rest, Armin; Rojas-Bravo, Cesar; Sand, David J.; Schwab, Michaela; Shahbandeh, Melissa; Shrestha, Manisha; Smith, Nathan; Strolger, Louis-Gregory; Szalai, Tamas; Taggart, Kirsty; Terreran, Giacomo; Terwel, Jacco H.; Tinyanont, Samaporn; Valenti, Stefano; Vinko, Jozsef; Wheeler, J. Craig; Yang, Yi; Zheng, Weikang; Ashall, Chris; DerKacy, James M.; Galbany, Lluis; Hoeflich, Peter; Hsiao, Eric; de Jaeger, Thomas; Lu, Jing; Maund, Justyn; Medler, Kyle; Morrell, Nidia; Shappee, Benjamin J.; Stritzinger, Maximilian; Suntzeff, Nicholas; Tucker, Michael; Wang, Lifan
    Nebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for both these rare SNe and the more common, cosmologically useful SNe Ia. We present observations from an extensive ground- and space-based follow-up campaign to characterize SN 2022pul, a super-Chandrasekhar mass SN Ia (alternatively "03fg-like" SN), from before peak brightness to well into the nebular phase across optical to mid-infrared (MIR) wavelengths. The early rise of the light curve is atypical, exhibiting two distinct components, consistent with SN Ia ejecta interacting with dense carbon-oxygen (C/O)-rich circumstellar material (CSM). In the optical, SN 2022pul is most similar to SN 2012dn, having a low estimated peak luminosity (M B = -18.9 mag) and high photospheric velocity relative to other 03fg-like SNe. In the nebular phase, SN 2022pul adds to the increasing diversity of the 03fg-like subclass. From 168 to 336 days after peak B-band brightness, SN 2022pul exhibits asymmetric and narrow emission from [O i] lambda lambda 6300, 6364 (FWHM approximate to 2000 km s-1), strong, broad emission from [Ca ii] lambda lambda 7291, 7323 (FWHM approximate to 7300 km s-1), and a rapid Fe iii to Fe ii ionization change. Finally, we present the first ever optical-to-MIR nebular spectrum of an 03fg-like SN Ia using data from JWST. In the MIR, strong lines of neon and argon, weak emission from stable nickel, and strong thermal dust emission (with T approximate to 500 K), combined with prominent [O i] in the optical, suggest that SN 2022pul was produced by a white dwarf merger within C/O-rich CSM.
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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
    (2024) Kwok, Lindsey A.; Siebert, Matthew R.; Johansson, Joel; Jha, Saurabh W.; Blondin, Stephane; Dessart, Luc; Foley, Ryan J.; Hillier, D. John; Larison, Conor; Pakmor, Ruediger; Temim, Tea; Andrews, Jennifer E.; Auchettl, Katie; Badenes, Carles; Barnabas, Barna; Bostroem, K. Azalee; Brenner Newman, Max J.; Brink, Thomas G.; Bustamante-Rosell, Maria Jose; Camacho-Neves, Yssavo; Clocchiatti, Alejandro; Coulter, David A.; Davis, Kyle W.; Deckers, Maxime; Dimitriadis, Georgios; Dong, Yize; Farah, Joseph; Filippenko, Alexei V.; Floers, Andreas; Fox, Ori D.; Garnavich, Peter; Padilla Gonzalez, Estefania; Graur, Or; Hambsch, Franz-Josef; Hosseinzadeh, Griffin; Howell, D. Andrew; Hughes, John P.; Kerzendorf, Wolfgang E.; Saux, Xavier K.; Maeda, Keiichi; Maguire, Kate; McCully, Curtis; Mihalenko, Cassidy; Newsome, Megan; O'Brien, John T.; Pearson, Jeniveve; Pellegrino, Craig; Pierel, Justin D. R.; Polin, Abigail; Rest, Armin; Rojas-Bravo, Cesar; Sand, David J.; Schwab, Michaela; Shahbandeh, Melissa; Shrestha, Manisha; Smith, Nathan; Strolger, Louis-Gregory; Szalai, Tamas; Taggart, Kirsty; Terreran, Giacomo; Terwel, Jacco H.; Tinyanont, Samaporn; Valenti, Stefano; Vinko, Jozsef; Wheeler, J. Craig; Yang, Yi; Zheng, WeiKang; Ashall, Chris; DerKacy, James M.; Galbany, Lluis; Hoeflich, Peter; de Jaeger, Thomas; Lu, Jing; Maund, Justyn; Medler, Kyle; Morell, Nidia; Shappee, Benjamin J.; Stritzinger, Maximilian; Suntzeff, Nicholas; Tucker, Michael; Wang, Lifan
    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 mu m 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 mu m was previously predicted as a hallmark of "violent merger" SN Ia models, where dynamical interaction between two sub-M-Ch 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] lambda lambda 6300, 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.
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    The LSST DESC DC2 Simulated Sky Survey
    (2021) Abolfathi, Bela; Alonso, David; Armstrong, Robert; Aubourg, Eric; Awan, Humna; Babuji, Yadu N.; Bauer, Franz Erik; Bean, Rachel; Beckett, George; Biswas, Rahul; Bogart, Joanne R.; Boutigny, Dominique; Chard, Kyle; Chiang, James; Claver, Chuck F.; Cohen-Tanugi, Johann; Combet, Celine; Connolly, Andrew J.; Daniel, Scott F.; Digel, Seth W.; Drlica-Wagner, Alex; Dubois, Richard; Gangler, Emmanuel; Gawiser, Eric; Glanzman, Thomas; Gris, Phillipe; Habib, Salman; Hearin, Andrew P.; Heitmann, Katrin; Hernandez, Fabio; Hlozek, Renee; Hollowed, Joseph; Ishak, Mustapha; Ivezic, Zeljko; Jarvis, Mike; Jha, Saurabh W.; Kahn, Steven M.; Kalmbach, J. Bryce; Kelly, Heather M.; Kovacs, Eve; Korytov, Danila; Krughoff, K. Simon; Lage, Craig S.; Lanusse, Francois; Larsen, Patricia; Le Guillou, Laurent; Li, Nan; Longley, Emily Phillips; Lupton, Robert H.; Mandelbaum, Rachel; Mao, Yao-Yuan; Marshall, Phil; Meyers, Joshua E.; Moniez, Marc; Morrison, Christopher B.; Nomerotski, Andrei; O'Connor, Paul; Park, HyeYun; Park, Ji Won; Peloton, Julien; Perrefort, Daniel; Perry, James; Plaszczynski, Stephane; Pope, Adrian; Rasmussen, Andrew; Reil, Kevin; Roodman, Aaron J.; Rykoff, Eli S.; Sanchez, F. Javier; Schmidt, Samuel J.; Scolnic, Daniel; Stubbs, Christopher W.; Tyson, J. Anthony; Uram, Thomas D.; Villarreal, Antonio; Walter, Christopher W.; Wiesner, Matthew P.; Wood-Vasey, W. Michael; Zuntz, Joe
    We describe the simulated sky survey underlying the second data challenge (DC2) carried out in preparation for analysis of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) by the LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark of LSST; the DC2 program represents a unique modeling effort that stresses this interconnectivity in a way that has not been attempted before. This effort encompasses a full end-to-end approach: starting from a large N-body simulation, through setting up LSST-like observations including realistic cadences, through image simulations, and finally processing with Rubin's LSST Science Pipelines. This last step ensures that we generate data products resembling those to be delivered by the Rubin Observatory as closely as is currently possible. The simulated DC2 sky survey covers six optical bands in a wide-fast-deep area of approximately 300 deg(2), as well as a deep drilling field of approximately 1 deg(2). We simulate 5 yr of the planned 10 yr survey. The DC2 sky survey has multiple purposes. First, the LSST DESC working groups can use the data set to develop a range of DESC analysis pipelines to prepare for the advent of actual data. Second, it serves as a realistic test bed for the image processing software under development for LSST by the Rubin Observatory. In particular, simulated data provide a controlled way to investigate certain image-level systematic effects. Finally, the DC2 sky survey enables the exploration of new scientific ideas in both static and time domain cosmology.
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    Three gravitationally lensed supernovae behind clash galaxy clusters
    (2014) Patel, Brandon; McCully, Curtis; Jha, Saurabh W.; Rodney, Steven A.; Jones, David O.; Graur, Or; Merten, Julian; Zitrin, Adi; Riess, Adam G.; Infante Lira, Leopoldo