Pulsars, transients and relativistic astrophysics

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Spectrophotometric templates for core-collapse supernovae and their application in simulations of time-domain surveys

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 489:4 (2019) 5802-5821

Authors:

M Vincenzi, M Sullivan, RE Firth, CP Gutiérrez, C Frohmaier, M Smith, C Angus, RC Nichol
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GBTrans: a commensal search for radio pulses with the Green Bank 20-m telescope

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 489:3 (2019) 4001-4006

Authors:

Golnoosh Golpayegani, Duncan R Lorimer, Steven W Ellingson, Devansh Agarwal, Olivia Young, Frank Ghigo, Richard Prestage, Kaustubh Rajwade, Maura A McLaughlin, Michael Mingyar
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Hierarchical Black Hole Mergers in Active Galactic Nuclei.

Physical review letters American Physical Society (APS) 123:18 (2019) ARTN 181101

Authors:

Y Yang, I Bartos, V Gayathri, Kes Ford, Z Haiman, S Klimenko, B Kocsis, S Márka, Z Márka, B McKernan, R O'Shaughnessy

Abstract:

The origins of the stellar-mass black hole mergers discovered by LIGO/Virgo are still unknown. Here we show that if migration traps develop in the accretion disks of active galactic nuclei (AGNs) and promote the mergers of their captive black holes, the majority of black holes within disks will undergo hierarchical mergers-with one of the black holes being the remnant of a previous merger. 40% of AGN-assisted mergers detected by LIGO/Virgo will include a black hole with mass ≳50M_{⊙}, the mass limit from stellar core collapse. Hierarchical mergers at traps in AGNs will exhibit black hole spins (anti)aligned with the binary's orbital axis, a distinct property from other hierarchical channels. Our results suggest, although not definitively (with odds ratio of ∼1), that LIGO's heaviest merger so far, GW170729, could have originated from this channel.
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SN 2017gmr: An Energetic Type II-P Supernova with Asymmetries

The Astrophysical Journal American Astronomical Society 885:1 (2019)

Authors:

Jennifer E Andrews, DJ Sand, S Valenti, Nathan Smith, Raya Dastidar, DK Sahu, Kuntal Misra, Avinash Singh, D Hiramatsu, PJ Brown, G Hosseinzadeh, S Wyatt, J Vinko, GC Anupama, I Arcavi, Chris Ashall, S Benetti, Marco Berton, KA Bostroem, M Bulla, J Burke, S Chen, L Chomiuk, A Cikota, E Congiu, B Cseh, Scott Davis, N Elias-Rosa, T Faran, Morgan Fraser, L Galbany, C Gall, A Gal-Yam, Anjasha Gangopadhyay, M Gromadzki, J Haislip, DA Howell, EY Hsiao, C Inserra, E Kankare, H Kuncarayakti, V Kouprianov, Brajesh Kumar, Xue Li, Han Lin, K Maguire, P Mazzali, C McCully, P Milne, Jun Mo, N Morrell, M Nicholl, P Ochner, F Olivares, A Pastorello, F Patat, M Phillips, G Pignata, S Prentice, A Reguitti, DE Reichart, Ó Rodríguez, Liming Rui, Pankaj Sanwal, K Sárneczky, M Shahbandeh, Mridweeka Singh, S Smartt, J Strader, MD Stritzinger, R Szakáts, L Tartaglia, Huijuan Wang, Lingzhi Wang, Xiaofeng Wang, JC Wheeler, Danfeng Xiang, O Yaron, DR Young, Junbo Zhang
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SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

The Astrophysical Journal Letters American Astronomical Society 885:1 (2019) l23

Authors:

Owen R McBrien, Stephen J Smartt, Ting-Wan Chen, Cosimo Inserra, James H Gillanders, Stuart A Sim, Anders Jerkstrand, Armin Rest, Stefano Valenti, Rupak Roy, Mariusz Gromadzki, Stefan Taubenberger, Andreas Flörs, Mark E Huber, Ken C Chambers, Avishay Gal-Yam, David R Young, Matt Nicholl, Erkki Kankare, Ken W Smith, Kate Maguire, Ilya Mandel, Simon Prentice, Ósmar Rodríguez, Jonathan Pineda Garcia, Claudia P Gutiérrez, Lluís Galbany, Cristina Barbarino, Peter SJ Clark, Jesper Sollerman, Shrinivas R Kulkarni, Kishalay De, David AH Buckley, Arne Rau
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