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SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)

(2021)

Authors:

Qinan Wang, Armin Rest, Yossef Zenati, Ryan Ridden-Harper, Georgios Dimitriadis, Gautham Narayan, V Ashley Villar, Mark R Magee, Ryan J Foley, Edward J Shaya, Peter Garnavich, Lifan Wang, Lei Hu, Attila Bodi, Patrick Armstrong, Katie Auchettl, Thomas Barclay, Geert Barentsen, Zsófia Bognár, Joseph Brimacombe, Joanna Bulger, Jamison Burke, Peter Challis, Kenneth Chambers, David A Coulter, Géza Csörnyei, Borbála Cseh, Maxime Deckers, Jessie L Dotson, Lluís Galbany, Santiago González-Gaitán, Mariusz Gromadzki, Michael Gully-Santiago, Ottó Hanyecz, Christina Hedges, Daichi Hiramatsu, Griffin Hosseinzadeh, D Andrew Howell, Steve B Howell, Mark E Huber, Saurabh W Jha, David O Jones, Réka Könyves-Tóth, Csilla Kalup, Charlie Kilpatrick, Levente Kriskovics, Wenxiong Li, Thomas B Lowe, Steven Margheim, Curtis McCully, Ayan Mitra, Jose A Muñoz, Matt Nicholl, Jakob Nordin, András Pál, Yen-Chen Pan, Anthony L Piro, Sofia Rest, João Rino-Silvestre, César Rojas-Bravo, Krisztián Sárneczky, Matthew R Siebert, Stephen J Smartt, Ken Smith, Ádám Sódor, Maximilian D Stritzinger, Róbert Szabó, Róbert Szakáts, Brad E Tucker, József Vinkó, Xiaofeng Wang, J Craig Wheeler, David R Young, Alfredo Zenteno, Kaicheng Zhang, Gabriella Zsidi
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Photometric, polarimetric, and spectroscopic studies of the luminous, slow-decaying Type Ib SN 2012au

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 507:1 (2021) 1229-1253

Authors:

SB Pandey, Amit Kumar, Brajesh Kumar, GC Anupama, S Srivastav, DK Sahu, J Vinko, A Aryan, A Pastorello, S Benetti, L Tomasella, Avinash Singh, AS Moskvitin, VV Sokolov, R Gupta, K Misra, P Ochner, S Valenti

Abstract:

ABSTRACT Optical, near-infrared (NIR) photometric and spectroscopic studies, along with the optical imaging polarimetric results for SN 2012au, are presented in this article to constrain the nature of the progenitor and other properties. Well-calibrated multiband optical photometric data (from –0.2 to +413 d since B-band maximum) were used to compute the bolometric light curve and to perform semi-analytical light-curve modelling using the minim code. A spin-down millisecond magnetar-powered model explains the observed photometric evolution of SN 2012au reasonably. Early-time imaging polarimetric follow-up observations (–2 to +31 d) and comparison with other similar cases indicate signatures of asphericity in the ejecta. Good spectral coverage of SN 2012au (from –5 to +391 d) allows us to trace the evolution of layers of SN ejecta in detail. SN 2012au exhibits higher line velocities in comparison with other SNe Ib. Late nebular phase spectra of SN 2012au indicate a Wolf–Rayet star as the possible progenitor for SN 2012au, with oxygen, He-core, and main-sequence masses of ∼1.62 ± 0.15 M⊙, ∼4–8 M⊙, and ∼17–25 M⊙, respectively. There is a clear absence of a first overtone of carbon monoxide (CO) features up to +319 d in the K-band region of the NIR spectra. Overall analysis suggests that SN 2012au is one of the most luminous slow-decaying Type Ib SNe, having comparatively higher ejecta mass (∼ 4.7–8.3 M⊙) and kinetic energy (∼ [4.8–5.4] × 1051 erg). Detailed modelling using mesa and the results obtained through stella and snec explosions also strongly support spin-down of a magnetar with mass of around 20 M⊙ and metallicity Z = 0.04 as a possible powering source of SN 2012au.
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Astronomy Domine: advancing science with a burning plasma

Contemporary Physics Taylor & Francis (2021)

Authors:

steven Rose, PETER HATFIELD
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Coherent curvature radiation: maximum luminosity and high-energy emission

ArXiv 2108.07818 (2021)

Authors:

AJ Cooper, RAMJ Wijers
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The 2019 outburst of the 2005 classical nova V1047 Cen: a record breaking dwarf nova outburst or a new phenomenon?

(2021)

Authors:

E Aydi, KV Sokolovsky, JS Bright, E Tremou, MM Nyamai, A Evans, J Strader, L Chomiuk, G Myers, F-J Hambsch, KL Page, DAH Buckley, CE Woodward, FM Walter, P Mróz, PJ Vallely, TR Geballe, DPK Banerjee, RD Gehrz, RP Fender, M Gromadzki, A Kawash, C Knigge, K Mukai, U Munari, M Orio, VARM Ribeiro, JL Sokoloski, S Starrfield, A Udalski, PA Woudt
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