Dr Shubham Srivastav: Publications

GW190425: Pan-STARRS and ATLAS coverage of the skymap and limits on optical emission associated with FRB 20190425A

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 528:2 (2024) 2299-2307

Authors:

SJ Smartt, M Nicholl, S Srivastav, ME Huber, KC Chambers, KW Smith, DR Young, MD Fulton, JL Tonry, CW Stubbs, L Denneau, AJ Cooper, A Aamer, JP Anderson, A Andersson, J Bulger, T-W Chen, P Clark, T de Boer, H Gao, JH Gillanders, A Lawrence, CC Lin, TB Lowe, EA Magnier, P Minguez, T Moore, A Rest, L Shingles, R Siverd, IA Smith, B Stalder, HF Stevance, R Wainscoat, R Williams

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The metamorphosis of the Type Ib SN 2019yvr: late-time interaction

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 529:1 (2023) L33-L40

Authors:

Lucía Ferrari, Gastón Folatelli, Hanindyo Kuncarayakti, Maximilian Stritzinger, Keiichi Maeda, Melina Bersten, Lili M Román Aguilar, M Manuela Sáez, Luc Dessart, Peter Lundqvist, Paolo Mazzali, Takashi Nagao, Chris Ashall, Subhash Bose, Seán J Brennan, Yongzhi Cai, Rasmus Handberg, Simon Holmbo, Emir Karamehmetoglu, Andrea Pastorello, Andrea Reguitti, Joseph Anderson, Ting-Wan Chen, Lluís Galbany, Mariusz Gromadzki, Claudia P Gutiérrez, Cosimo Inserra, Erkki Kankare, Tomás E Müller Bravo, Seppo Mattila, Matt Nicholl, Giuliano Pignata, Jesper Sollerman, Shubham Srivastav, David R Young

Abstract:

ABSTRACT We present observational evidence of late-time interaction between the ejecta of the hydrogen-poor Type Ib supernova (SN) 2019yvr and hydrogen-rich circumstellar material (CSM), similar to the Type Ib SN 2014C. A narrow H α emission line appears simultaneously with a break in the light-curve decline rate at around 80–100 d after explosion. From the interaction delay and the ejecta velocity, under the assumption that the CSM is detached from the progenitor, we estimate the CSM inner radius to be located at ∼6.5–9.1 × 1015 cm. The H α emission line persists throughout the nebular phase at least up to +420 d post-explosion, with a full width at half maximum of ∼2000 km s−1. Assuming a steady mass-loss, the estimated mass-loss rate from the luminosity of the H α line is ∼3–7 × 10−5 M⊙ yr−1. From hydrodynamical modelling and analysis of the nebular spectra, we find a progenitor He-core mass of 3–4 M⊙, which would imply an initial mass of 13–15 M⊙. Our result supports the case of a relatively low-mass progenitor possibly in a binary system as opposed to a higher mass single star undergoing a luminous blue variable phase.

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A precursor plateau and pre-maximum [O ii] emission in the superluminous SN2019szu: a pulsational pair-instability candidate

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:4 (2023) 11970-11995

Authors:

Aysha Aamer, Matt Nicholl, Anders Jerkstrand, Sebastian Gomez, Samantha R Oates, Stephen J Smartt, Shubham Srivastav, Giorgos Leloudas, Joseph P Anderson, Edo Berger, Thomas de Boer, Kenneth Chambers, Ting-Wan Chen, Lluís Galbany, Hua Gao, Benjamin P Gompertz, Maider González-Bañuelos, Mariusz Gromadzki, Claudia P Gutiérrez, Cosimo Inserra, Thomas B Lowe, Eugene A Magnier, Paolo A Mazzali, Thomas Moore, Tomás E Müller-Bravo, Miika Pursiainen, Armin Rest, Steve Schulze, Ken W Smith, Jacco H Terwel, Richard Wainscoat, David R Young

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NEural Engine for Discovering Luminous Events (NEEDLE): identifying rare transient candidates in real time from host galaxy images

(2023)

Authors:

Xinyue Sheng, Matt Nicholl, Ken W Smith, David R Young, Roy D Williams, Heloise F Stevance, Stephen J Smartt, Shubham Srivastav, Thomas Moore

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Minutes-duration optical flares with supernova luminosities

Nature Springer Nature 623:7989 (2023) 927-931

Authors:

Anna YQ Ho, Daniel A Perley, Ping Chen, Steve Schulze, Vik Dhillon, Harsh Kumar, Aswin Suresh, Vishwajeet Swain, Michael Bremer, Stephen J Smartt, Joseph P Anderson, GC Anupama, Supachai Awiphan, Sudhanshu Barway, Eric C Bellm, Sagi Ben-Ami, Varun Bhalerao, Thomas de Boer, Thomas G Brink, Rick Burruss, Poonam Chandra, Ting-Wan Chen, Wen-Ping Chen, Jeff Cooke, Michael W Coughlin, Kaustav K Das, Andrew J Drake, Alexei V Filippenko, James Freeburn, Christoffer Fremling, Michael D Fulton, Avishay Gal-Yam, Lluís Galbany, Hua Gao, Matthew J Graham, Mariusz Gromadzki, Claudia P Gutiérrez, K-Ryan Hinds, Cosimo Inserra, Nayana A J, Viraj Karambelkar, Mansi M Kasliwal, Shri Kulkarni, Tomás E Müller-Bravo, Eugene A Magnier, Ashish A Mahabal, Thomas Moore, Chow-Choong Ngeow, Matt Nicholl, Eran O Ofek, Conor MB Omand, Francesca Onori, Yen-Chen Pan, Priscila J Pessi, Glen Petitpas, David Polishook, Saran Poshyachinda, Miika Pursiainen, Reed Riddle, Antonio C Rodriguez, Ben Rusholme, Enrico Segre, Yashvi Sharma, Ken W Smith, Jesper Sollerman, Shubham Srivastav, Nora Linn Strotjohann, Mark Suhr, Dmitry Svinkin, Yanan Wang, Philip Wiseman, Avery Wold, Sheng Yang, Yi Yang, Yuhan Yao, David R Young, WeiKang Zheng

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Dr Shubham Srivastav

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GW190425: Pan-STARRS and ATLAS coverage of the skymap and limits on optical emission associated with FRB 20190425A

Authors:

The metamorphosis of the Type Ib SN 2019yvr: late-time interaction

Authors:

Abstract:

A precursor plateau and pre-maximum [O ii] emission in the superluminous SN2019szu: a pulsational pair-instability candidate

Authors:

NEural Engine for Discovering Luminous Events (NEEDLE): identifying rare transient candidates in real time from host galaxy images

Authors:

Minutes-duration optical flares with supernova luminosities

Authors:

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Dr Shubham Srivastav

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GW190425: Pan-STARRS and ATLAS coverage of the skymap and limits on optical emission associated with FRB 20190425A

Authors:

The metamorphosis of the Type Ib SN 2019yvr: late-time interaction

Authors:

Abstract:

A precursor plateau and pre-maximum [O ii] emission in the superluminous SN2019szu: a pulsational pair-instability candidate

Authors:

NEural Engine for Discovering Luminous Events (NEEDLE): identifying rare transient candidates in real time from host galaxy images

Authors:

Minutes-duration optical flares with supernova luminosities

Authors: