Pulsars, transients and relativistic astrophysics

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Signatures of Circumstellar Interaction in the Type IIL Supernova ASASSN-15oz

(2019)

Authors:

K Azalee Bostroem, Stefano Valenti, Assaf Horesh, Viktoriya Morozova, N Paul M Kuin, Samuel Wyatt, Anders Jerkstrand, David J Sand, Michael Lundquist, Mathew Smith, Mark Sullivan, Griffin Hosseinzadeh, Iair Arcavi, Emma Callis, Régis Cartier, Avishay Gal-Yam, Lluís Galbany, Claudia Gutiérrez, D Andrew Howell, Cosimo Inserra, Erkki Kankare, Kristhell Marisol López, Curtis McCully, Giuliano Pignata, Anthony L Piro, Ósmar Rodríguez, Stephen J Smartt, Kenneth W Smith, Ofer Yaron, David R Young
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Towards the first detection of strongly lensed H i emission

Monthly Notices of the Royal Astronomical Society Oxford University Press 484:3 (2019) 3681-3690

Authors:

T Blecher, R Deane, Ian Heywood, D Obreschkow
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Tracking the variable jets of V404 Cygni during its 2015 outburst

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 482:3 (2019) 2950-2972

Authors:

AJ Tetarenko, GR Sivakoff, JCA Miller-Jones, M Bremer, KP Mooley, RP Fender, C Rumsey, A Bahramian, D Altamirano, S Heinz, D Maitra, SB Markoff, S Migliari, MP Rupen, DM Russell, TD Russell, CL Sarazin
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Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj

(2019)

Authors:

M Gromadzki, A Hamanowicz, L Wyrzykowski, KV Sokolovsky, M Fraser, Sz Kozlowski, J Guillochon, I Arcavi, B Trakhtenbrot, PG Jonker, S Mattila, A Udalski, MK Szymanski, I Soszynski, R Poleski, P Pietrukowicz, J Skowron, P Mroz, K Ulaczyk, M Pawlak, KA Rybicki, J Sollerman, F Taddia, Z Kostrzewa-Rutkowska, F Onori, DR Young, K Maguire, SJ Smartt, C Inserra, A Gal-Yam, A Rau, T-W Chen, CR Angus, DAH Buckley
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The twisted jets of Circinus X-1

Monthly Notices of the Royal Astronomical Society Oxford University Press 484:2 (2019) 1672-1686

Authors:

M Coriat, Rp Fender, C Tasse, O Smirnov, Ak Tzioumis, Jw Broderick

Abstract:

We present the results of millimetre (33 and 35 GHz) and centimetre (2.1, 5.5, and 9.0 GHz) wavelength observations of the neutron star X-ray binary Circinus X-1, using the Australia Telescope Compact Array. We have used advanced calibration and de-convolution algorithms to overcome multiple issues due to intrinsic variability of the source and direction-dependent effects. The resulting centimetre and millimetre radio maps show spatially resolved jet structures from sub-arcsecond to arcminute angular scales. They represent the most detailed investigation to date of the interaction of the relativistic jet from the X-ray binary with the young supernova remnant in which it is embedded. Comparison of projected jet axes at different wavelengths indicates significant rotation of the jet axis with increasing angular scale. This either suggests interactions of the jet material with surrounding media, creating bends in the jet flow path, or jet precession. We explore the latter hypothesis by successfully modelling the observed jet path using a kinematic jet model. If precession is the right interpretation and our modelling is correct, the best-fitting parameters describe an accreting source with mildly relativistic ejecta (v = 0.5c), inclined close to the plane of the sky (i = 86 ◦ ) and precessing over a 5-yr period.
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