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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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Supermassive black holes in merger-free galaxies have higher spins which are preferentially aligned with their host galaxy

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:4 (2023) 10867-10877

Authors:

RS Beckmann, RJ Smethurst, BD Simmons, A Coil, Y Dubois, IL Garland, CJ Lintott, G Martin, S Peirani, C Pichon
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XMM-Newton-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:4 (2023) 11823-11839

Authors:

D Eappachen, PG Jonker, J Quirola-Vásquez, D Mata Sánchez, A Inkenhaag, AJ Levan, M Fraser, MAP Torres, FE Bauer, AA Chrimes, D Stern, MJ Graham, SJ Smartt, KW Smith, ME Ravasio, AI Zabludoff, M Yue, F Stoppa, DB Malesani, NC Stone, S Wen
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X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1

(2023)

Authors:

John Rankin, Fabio La Monaca, Alessandro Di Marco, Juri Poutanen, Anna Bobrikova, Vadim Kravtsov, Fabio Muleri, Maura Pilia, Alexandra Veledina, Rob Fender, Philip Kaaret, Dawoon E Kim, Andrea Marinucci, Herman L Marshall, Alessandro Papitto, Allyn F Tennant, Sergey S Tsygankov, Martin C Weisskopf, Kinwah Wu, Silvia Zane, Filippo Ambrosino, Ruben Farinelli, Andrea Gnarini, Iván Agudo, Lucio A Antonelli, Matteo Bachetti, Luca Baldini, Wayne H Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolò Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolò di Lalla, Immacolata Donnarumma, Victor Doroshenko, Michal Dovčiak, Steven R Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G Jorstad, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J Kolodziejczak, Henric Krawczynski, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frédéric Marin, Alan P Marscher, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Michela Negro, Chi-Yung Ng, Stephen L O'Dell, Nicola Omodei, Chiara Oppedisano, George G Pavlov, Abel L Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Andrea Possenti, Simonetta Puccetti, Brian D Ramsey, Ajay Ratheesh, Oliver J Roberts, Roger W Romani, Carmelo Sgrò, Patrick Slane, Paolo Soffitta, Gloria Spandre, Douglas A Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Nicholas E Thomas, Francesco Tombesi, Alessio Trois, Roberto Turolla, Jacco Vink, Fei Xie
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