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A compressed sensing faraday depth reconstruction framework for the MeerKAT MIGHTEE-POL Survey

Proceedings of the 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC 2022) IEEE (2022) 1-4

Authors:

M Carcamo, A Scaife, R Taylor, M Jarvis, M Bowles, S Sekhar, L Heino, J Stil

Abstract:

In this work we present a novel compute framework for reconstructing Faraday depth signals from noisy and incomplete spectro-polarimetric radio datasets. This framework is based on a compressed-sensing approach that addresses a number of outstanding issues in Faraday depth reconstruction in a systematic and scaleable manner. We apply this framework to early-release data from the MeerKAT MIGHTEE polarisation survey.
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Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631

(2022)

Authors:

Y-Z Cai, A Pastorello, M Fraser, X-F Wang, AV Filippenko, A Reguitti, KC Patra, VP Goranskij, EA Barsukova, TG Brink, N Elias-Rosa, HF Stevance, W Zheng, Y Yang, KE Atapin, S Benetti, TJL de Boer, S Bose, J Burke, R Byrne, E Cappellaro, KC Chambers, W-L Chen, N Emami, H Gao, D Hiramatsu, DA Howell, ME Huber, E Kankare, PL Kelly, R Kotak, T Kravtsov, V Yu Lander, Z-T Li, C-C Lin, P Lundqvist, EA Magnier, EA Malygin, NA Maslennikova, K Matilainen, PA Mazzali, C McCully, J Mo, S Moran, M Newsome, DV Oparin, E Padilla Gonzalez, TM Reynolds, NI Shatsky, SJ Smartt, KW Smith, MD Stritzinger, AM Tatarnikov, G Terreran, RI Uklein, G Valerin, PJ Vallely, OV Vozyakova, R Wainscoat, S-Y Yan, J-J Zhang, T-M Zhang, SG Zheltoukhov, R Dastidar, M Fulton, L Galbany, A Gangopadhyay, H-W Ge, CP Gutiérrez, H Lin, K Misra, Z-W Ou, I Salmaso, L Tartaglia, L Xiao, X-H Zhang
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A Late-time Radio Flare Following a Possible Transition in Accretion State in the Tidal Disruption Event AT 2019azh

ASTROPHYSICAL JOURNAL 933:2 (2022) ARTN 176

Authors:

Itai Sfaradi, Assaf Horesh, Rob Fender, David A Green, David RA Williams, Joe Bright, Steve Schulze
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EAS 2022 takes positive steps forward for sustainable astronomy

Nature Astronomy Springer Nature 6:7 (2022) 765-765

Authors:

Antoaneta Antonova, Maarten Baes, Andreas Burkert, Roger L Davies, Inma Dominguez, Lex Kaper, Nick D Kylafis, Sara Lucatello, Georges Meylan, Agata Różańska
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Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds.

Nature astronomy 6:7 (2022) 828-836

Authors:

Manisha Caleb, Ian Heywood, Kaustubh Rajwade, Mateusz Malenta, Benjamin Stappers, Ewan Barr, Weiwei Chen, Vincent Morello, Sotiris Sanidas, Jakob van den Eijnden, Michael Kramer, David Buckley, Jaco Brink, Sara Elisa Motta, Patrick Woudt, Patrick Weltevrede, Fabian Jankowski, Mayuresh Surnis, Sarah Buchner, Mechiel Christiaan Bezuidenhout, Laura Nicole Driessen, Rob Fender

Abstract:

The radio-emitting neutron star population encompasses objects with spin periods ranging from milliseconds to tens of seconds. As they age and spin more slowly, their radio emission is expected to cease. We present the discovery of an ultra-long period radio-emitting neutron star, PSR J0901-4046, with spin properties distinct from the known spin and magnetic-decay powered neutron stars. With a spin-period of 75.88 s, a characteristic age of 5.3 Myr, and a narrow pulse duty-cycle, it is uncertain how radio emission is generated and challenges our current understanding of how these systems evolve. The radio emission has unique spectro-temporal properties such as quasi-periodicity and partial nulling that provide important clues to the emission mechanism. Detecting similar sources is observationally challenging, which implies a larger undetected population. Our discovery establishes the existence of ultra-long period neutron stars, suggesting a possible connection to the evolution of highly magnetized neutron stars, ultra-long period magnetars, and fast radio bursts.
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