Dr Shubham Srivastav: Publications

Characterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties

The Astrophysical Journal American Astronomical Society 974:2 (2024) 316

Authors:

Yize Dong, Stefano Valenti, Chris Ashall, Marc Williamson, David J Sand, Schuyler D Van Dyk, Alexei V Filippenko, Saurabh W Jha, Michael Lundquist, Maryam Modjaz, Jennifer E Andrews, Jacob E Jencson, Griffin Hosseinzadeh, Jeniveve Pearson, Lindsey A Kwok, Teresa Boland, Eric Y Hsiao, Nathan Smith, Nancy Elias-Rosa, Shubham Srivastav, Stephen Smartt, Michael Fulton, WeiKang Zheng, Thomas G Brink, Melissa Shahbandeh, K Azalee Bostroem, Emily Hoang, Daryl Janzen, Darshana Mehta, Nicolas Meza, Manisha Shrestha, Samuel Wyatt, Katie Auchettl, Christopher R Burns, Joseph Farah, Lluís Galbany, Estefania Padilla Gonzalez, Joshua Haislip, Jason T Hinkle, D Andrew Howell, Thomas De Jaeger, Vladimir Kouprianov, Sahana Kumar, Jing Lu, Curtis McCully, Shane Moran, Nidia Morrell, Megan Newsome, Craig Pellegrino, Abigail Polin, Daniel E Reichart, BJ Shappee, Maximilian D Stritzinger, Giacomo Terreran, MA Tucker

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SN 2021dbg: A Luminous Type IIP–IIL Supernova Exploding from a Massive Star with a Layered Shell

The Astrophysical Journal American Astronomical Society 973:2 (2024) 155-155

Authors:

Zeyi Zhao, Jujia Zhang, Liping Li, Qian Zhai, Yongzhi Cai, Shubham Srivastav, Xiaofeng Wang, Han Lin, Yi Yang, Alexei V Filippenko, Thomas G Brink, WeiKang Zheng

Abstract:

Abstract We present extensive observations and analysis of supernova (SN) SN 2021dbg, utilizing optical photometry and spectroscopy. For approximately 385 days following the explosion, SN 2021dbg exhibited remarkable luminosity, surpassing most Type II SNe (SNe II). This initial high luminosity is potentially attributed to interaction between the ejected material and the surrounding circumstellar material (CSM), as evidenced by the pronounced interaction signatures observed in its spectra. The subsequent high luminosity is primarily due to the significant 56 Ni mass (0.17 ± 0.05 M ⊙ ) produced in the explosion. Based on the flux of flash emission lines detected in the initial spectra, we estimate that the CSM mass near the progenitor amounted to ∼(1.0–2.0) × 10 −3 M ⊙ , likely resulting from intense stellar wind activity 2–3 yr preceding the explosion. Considering the bolometric light curve, nebular spectrum modeling, and mass-loss rate, we suggest that the progenitor of SN 2021dbg was a red supergiant (RSG) with a mass of ∼20 M ⊙ and a radius of 1200 R ⊙ . This RSG featured a thick hydrogen shell, which may have contained a region with a sharp decrease in material density, electron density, and temperature, contributing to its layered structure. This object demonstrates mixed features of Type IIP and IIL SNe, making it a transitional event linking the above two subclasses of SNe II.

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Identification of the optical counterpart of the fast X-ray transient EP240414a

ArXiv 2409.1907 (2024)

Authors:

S Srivastav, T-W Chen, JH Gillanders, L Rhodes, SJ Smartt, ME Huber, A Aryan, S Yang, A Beri, AJ Cooper, M Nicholl, KW Smith, HF Stevance, F Carotenuto, KC Chambers, A Aamer, CR Angus, MD Fulton, T Moore, IA Smith, DR Young, T de Boer, H Gao, C-C Lin, T Lowe, EA Magnier, P Minguez, Y-C Pan, RJ Wainscoat

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Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc

ArXiv 2409.17296 (2024)

Authors:

A Gkini, C Fransson, R Lunnan, S Schulze, F Poidevin, N Sarin, R Könyves-Tóth, J Sollerman, CMB Omand, SJ Brennan, KR Hinds, JP Anderson, M Bronikowski, T-W Chen, R Dekany, M Fraser, C Fremling, L Galbany, A Gal-Yam, A Gangopadhyay, S Geier, EP Gonzalez, M Gromadzki, SL Groom, CP Gutiérrez, D Hiramatsu, DA Howell, Y Hu, C Inserra, M Kopsacheili, L Lacroix, FJ Masci, K Matilainen, C McCully, T Moore, TE Müller-Bravo, M Nicholl, C Pellegrino, I Pérez-Fournon, DA Perley, PJ Pessi, T Petrushevska, G Pignata, F Ragosta, A Sahu, A Singh, S Srivastav, JL Wise, L Yan, DR Young

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Double "acct": a distinct double-peaked supernova matching pulsational pair-instability models

ArXiv 2409.02174 (2024)

Authors:

CR Angus, SE Woosley, RJ Foley, M Nicholl, VA Villar, K Taggart, M Pursiainen, P Ramsden, S Srivastav, HF Stevance, T Moore, K Auchettl, WB Hoogendam, N Khetan, SK Yadavalli, G Dimitriadis, A Gagliano, MR Siebert, A Aamer, T de Boer, KC Chambers, A Clocchiatti, DA Coulter, MR Drout, D Farias, MD Fulton, C Gall, H Gao, L Izzo, DO Jones, C-C Lin, EA Magnier, G Narayan, E Ramirez-Ruiz, CL Ransome, A Rest, SJ Smartt, KW Smith

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Dr Shubham Srivastav

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Characterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties

Authors:

SN 2021dbg: A Luminous Type IIP–IIL Supernova Exploding from a Massive Star with a Layered Shell

Authors:

Abstract:

Identification of the optical counterpart of the fast X-ray transient EP240414a

Authors:

Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc

Authors:

Double "acct": a distinct double-peaked supernova matching pulsational pair-instability models

Authors:

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Dr Shubham Srivastav

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Characterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties

Authors:

SN 2021dbg: A Luminous Type IIP–IIL Supernova Exploding from a Massive Star with a Layered Shell

Authors:

Abstract:

Identification of the optical counterpart of the fast X-ray transient EP240414a

Authors:

Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc

Authors:

Double "acct": a distinct double-peaked supernova matching pulsational pair-instability models

Authors: