Article
Astronomy & Astrophysics
Ondrej Pejcha, Diego Calderon, Petr Kurfurst
Summary: This study investigates the effects of interactions between a core-collapse supernova exploding in a binary star system and the overdense shell formed from previous stellar wind collisions on supernova light curves. Results show that under certain conditions, the radiated shock power may exceed typical supernova luminosity, providing insights into the importance of double red supergiant binary systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Y-Z Cai, A. Pastorello, M. Fraser, X-F Wang, A. Filippenko, A. Reguitti, K. C. Patra, V. P. Goranskij, E. A. Barsukova, T. G. Brink, N. Elias-Rosa, H. F. Stevance, W. Zheng, Y. Yang, K. E. Atapin, S. Benetti, T. J. L. de Boer, S. Bose, J. Burke, R. Byrne, E. Cappellaro, K. C. Chambers, W-L Chen, N. Emami, H. Gao, D. Hiramatsu, D. A. Howell, M. E. Huber, E. Kankare, P. L. Kelly, R. Kotak, T. Kravtsov, V. Yu Lander, Z-T Li, C-C Lin, P. Lundqvist, E. A. Magnier, E. A. Malygin, N. A. Maslennikova, K. Matilainen, P. A. Mazzali, C. McCully, J. Mo, S. Moran, M. Newsome, D. Oparin, E. Padilla Gonzalez, T. M. Reynolds, N. Shatsky, S. J. Smartt, K. W. Smith, M. D. Stritzinger, A. M. Tatarnikov, G. Terreran, R. Uklein, G. Valerin, P. J. Vallely, O. V. Vozyakova, R. Wainscoat, S-Y Yan, J-J Zhang, T-M Zhang, S. G. Zheltoukhov, R. Dastidar, M. Fulton, L. Galbany, A. Gangopadhyay, H-W Ge, C. P. Gutierrez, H. Lin, K. Misra, Z-W Ou, I Salmaso, L. Tartaglia, L. Xiao, X-H Zhang
Summary: We studied the luminous red nova AT 2021biy in NGC 4631, revealing its unique outburst process and spectral evolution. Spectral analysis suggests AT 2021biy could be a yellow supergiant with a progenitor of around 20 solar masses.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Naoto Harada, Shingo Hirano, Masahiro N. Machida, Takashi Hosokawa
Summary: By combining numerical simulations and analytical modeling, the study investigated the formation of close binary systems under the influence of magnetic braking. It was found that wide binary systems form in unmagnetized clouds, while close binary systems can form in magnetized clouds. Additionally, protostellar outflow has a negative impact on the formation of close binary systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Pastorello, G. Valerin, M. Fraser, N. Elias-Rosa, S. Valenti, A. Reguitti, P. A. Mazzali, R. C. Amaro, J. E. Andrews, Y. Dong, J. Jencson, M. Lundquist, D. E. Reichart, D. J. Sand, S. Wyatt, S. J. Smartt, K. W. Smith, S. Srivastav, Y. -Z. Cai, E. Cappellaro, S. Holmbo, A. Fiore, D. Jones, E. Kankare, E. Karamehmetoglu, P. Lundqvist, A. Morales-Garoffolo, T. M. Reynolds, M. D. Stritzinger, S. C. Williams, K. C. Chambers, T. J. L. de Boer, M. E. Huber, A. Rest, R. Wainscoat
Summary: The study presents the results of monitoring campaigns for the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. Both objects show slow luminosity rise before their major outbursts, with AT 2020kog being moderately luminous compared to AT 2020hat. The spectra of AT 2020kog change significantly with time, resembling type TM supernovae early on and later transitioning to K-type and M-type stars, while AT 2020hat displays a redder continuum and late appearance of molecular bands.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
David R. Aguilera-Dena, Norbert Langer, John Antoniadis, Daniel Pauli, Luc Dessart, Alejandro Vigna-Gomez, Gotz Graefener, Sung-Chul Yoon
Summary: This study investigates the evolution of massive stars through evolutionary models of single helium stars. It suggests that models with nitrogen-rich envelopes are candidate WN stars, while models with carbon-rich surface are candidate WC stars and WO stars during different stages of their evolution. The study also measures the metallicity dependence of the total lifetimes of the models and proposes an estimate of the wind's optical depth to distinguish between different types of stars. Population models are constructed to predict the numbers of different types of stars at different metallicities.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Kohki Uno, Keiichi Maeda
Summary: A wind-driven model is used to model the observational properties of transients powered by continuous outflow from a central system. This study introduces a time-dependent wind-driven model that considers the expanding outflow and time evolution of the outflow rate. The model is applied to a sample of well-observed fast blue optical transients (FBOTs) and suggests that FBOTs may be related to relativistic objects such as black holes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. J. Rickard, D. Pauli
Summary: By analyzing the spectrum and orbit of the early-type massive binary SSN 7, we constrained the binary evolution in low metallicity and found it to be the most massive Algol-like system discovered so far. This study enhances our understanding of massive star binary evolution and the formation of gravitational wave progenitors.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
N. Shagatova, A. Skopal, S. Yu. Shugarov, R. Komzik, E. Kundra, F. Teyssier
Summary: This paper investigates the non-spherical distribution of the neutral wind zone around the red giant in the symbiotic binary star, focusing on the wind towards the orbital plane and its asymmetry alongside the orbital motion of the red giant. By analyzing the periodic orbital variations of fluxes and radial velocities of individual components of spectral lines, the study reveals the asymmetric shaping of the neutral wind zone at the near-orbital-plane region. The findings provide important insights into the wind mass transfer dynamics in symbiotic binary stars.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Andre-Nicolas Chene, Laurent Mahy, Eric Gosset, Nicole St-Louis, Karan Dsilva, Rajeev Manick
Summary: The WR star WR 63 is likely a triple system composed of two non-interacting late-O stars orbiting a WR star on a period longer than 1000 days. The variability of the spectral line-profile might be related to periodic photometric variations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Pastorello, M. Fraser, G. Valerin, A. Reguitti, K. Itagaki, P. Ochner, S. C. Williams, D. Jones, J. Munday, S. J. Smartt, K. W. Smith, S. Srivastav, N. Elias-Rosa, E. Kankare, E. Karamehmetoglu, P. Lundqvist, P. A. Mazzali, U. Munari, M. D. Stritzinger, L. Tomasella, J. P. Anderson, K. C. Chambers, A. Rest
Summary: AT 2019zhd is the third luminous red nova event observed in M 31, showing a slow luminosity rise over about five months before a significant brightening and peak, followed by a short-duration plateau in the red bands and a rapid linear decline. The latest spectra display a red continuum resembling that of M-type stars.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Misa Ogata, Ryosuke Hirai, Kotaro Hijikawa
Summary: A systematic study on the response of companion stars in massive binaries impacted by supernova ejecta was conducted. It was found that the maximum luminosity during inflation phase depends on stellar mass, and a correlation between expansion duration and intersected energy was identified. The study provides insights for constraining pre-SN binary parameters and estimating the occurrence of observable inflated companions in stripped-envelope SNe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Nadejda Blagorodnova, Jakub Klencki, Ondrej Pejcha, Paul M. Vreeswijk, Howard E. Bond, Kevin B. Burdge, Kishalay De, Christoffer Fremling, Robert D. Gehrz, Jacob E. Jencson, Mansi M. Kasliwal, Thomas Kupfer, Ryan M. Lau, Frank J. Masci, Michael R. Rich
Summary: This study investigates the properties of the luminous red nova AT 2018bwo discovered in NGC 45, including its photometric and spectroscopic characteristics, as well as the parameters of its progenitor system, demonstrating its association with the common envelope of a binary system. The stable performance during the optical plateau phase suggests a prolonged mass-loss event may have occurred. By using stellar binary-evolution models, the primary star mass and dynamical information of the system were inferred.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Ryosuke Hirai, Philipp Podsiadlowski, Stanley P. Owocki, Fabian R. N. Schneider, Nathan Smith
Summary: Eta Carinae, a massive star known for its 19th century Great Eruption and the surrounding Homunculus nebula, is believed to have resulted from a stellar merger in an unstable triple system. Detailed theoretical calculations suggest that the bipolar post-merger wind plays a crucial role in creating the Homunculus nebula, supporting the merger-in-a-triple scenario.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Amit Kashi, Amir Michaelis, Yarden Kaminetsky
Summary: This study conducts a numerical experiment to investigate the wind ejection phenomenon in a massive colliding-wind binary system, and quantifies the accretion onto the secondary star based on different primary mass-loss rates. The results show that as the wind momentum ratio eta decreases, the colliding-wind structure moves closer to the secondary star. The study finds that when eta is less than or equal to 0.05, clumps originating from instabilities are accreted onto the secondary, reaching the accretion threshold. The mass accretion rate and different regions in the (M)over dot(acc) - eta diagram are calculated for each eta value.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Iris de Ruiter, Miriam M. Nyamai, Antonia Rowlinson, Ralph A. M. J. Wijers, Tim J. O'Brien, David R. A. Williams, Patrick Woudt
Summary: We present low-frequency radio observations of the recurrent nova RS Ophiuchi in 2021, including the lowest frequency observations to date. The radio emission is interpreted as synchrotron emission from the shock interaction between the nova ejecta and the circumbinary medium. The light curve shows plateauing behavior after the initial peak, which can be explained by a non-uniform density of the circumbinary medium or a second emission component. Modeling of the light curves suggests a red giant mass-loss rate of about 5 x 10^(-8) solar masses. Future observations are proposed to further advance our understanding of RS Ophiuchi's physical properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. Petrushevska, G. Leloudas, D. Ilic, M. Bronikowski, P. Charalampopoulos, G. K. Jaisawal, E. Paraskeva, M. Pursiainen, N. Rakic, S. Schulze, K. Taggart, C. K. Wedderkopp, J. P. Anderson, T. de Boer, K. Chambers, T. W. Chen, G. Damljanovic, M. Fraser, H. Gao, A. Gomboc, M. Gromadzki, N. Ihanec, K. Maguire, B. Marcun, T. E. Mueller-Bravo, M. Nicholl, F. Onori, T. M. Reynolds, S. J. Smartt, J. Sollerman, K. W. Smith, T. Wevers, L. Wyrzykowski
Summary: The study of PS16dtm, a nuclear transient in a Narrow Line Seyfert 1 (NLSy1) galaxy, reveals that its observed properties are difficult to reconcile with normal AGN variability. Despite differences compared to TDEs in quiescent galaxies, PS16dtm displays broad Balmer line profiles and Fe II complexes, suggesting that it may still be a tidal disruption event. This implies that some changing look episodes in AGN may be triggered by TDEs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Cheongho Han, Andrzej Udalski, Youn Kil Jung, Doeon Kim, Hongjing Yang, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Hyoun-Woo Kim, Chung-Uk Lee, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Chun-Hwey Kim, Woong-Tae Kim, Przemek Mroz, Michal K. Szymanski, Jan Skowron, Radoslaw Poleski, Igor Soszynski, Pawel Pietrukowicz, Szymon A. Kozlowski, Krzysztof Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki
Summary: In this study, we conducted a systematic investigation of previous observation data to re-analyze anomalous lensing events without plausible models. We found that usual models based on either a binary-lens single-source (2L1S) or a single-lens binary-source (1L2S) interpretation cannot explain two anomalous lensing events. By adding extra lens or source components to the lens system configuration, we tested the feasibility of explaining the events with more sophisticated models. The results show that a 2L2S interpretation explains the light curves of both events well, and there are pairs of solutions due to close and wide degeneracy.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Z. Liu, A. Malyali, M. Krumpe, D. Homan, A. J. Goodwin, I. Grotova, A. Kawka, A. Rau, A. Merloni, G. E. Anderson, J. C. A. Miller-Jones, A. G. Markowitz, S. Ciroi, F. Di Mille, M. Schramm, S. Tang, D. A. H. Buckley, M. Gromadzki, C. Jin, J. Buchner
Summary: This study presents a detailed multi-wavelength analysis of a repeating X-ray nuclear transient, J0456-20, and finds that it goes through four distinctive phases in terms of X-ray variability. The X-ray spectra become harder as the X-ray flux increases, and there is evidence of a warm and hot corona causing the X-ray emission.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
S. Moran, M. Fraser, R. Kotak, A. Pastorello, S. Benetti, S. J. Brennan, C. P. Gutierrez, E. Kankare, H. Kuncarayakti, S. Mattila, T. M. Reynolds, J. P. Anderson, P. J. Brown, S. Campana, K. C. Chambers, T-W Chen, M. Della Valle, M. Dennefeld, N. Elias-Rosa, L. Galbany, F. J. Galindo-Guil, M. Gromadzki, D. Hiramatsu, C. Inserra, G. Leloudas, T. E. Mueller-Bravo, M. Nicholl, A. Reguitti, M. Shahbandeh, S. J. Smartt, L. Tartaglia, D. R. Young
Summary: We present the five-year follow-up campaign of the long-lived type IIn supernova SN 2017hcc, which was found in a spiral dwarf host of near-solar metallicity. The supernova shows a slow evolution both spectroscopically and photometrically, similar to SN 2010jl. The infrared excess and blueshifts in the Balmer lines suggest the presence of an IR light echo and the condensation of new dust grains at later epochs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
T. Nagao, H. Kuncarayakti, K. Maeda, T. Moore, A. Pastorello, S. Mattila, K. Uno, S. J. Smartt, S. A. Sim, L. Ferrari, L. Tomasella, J. P. Anderson, T. -W. Chen, L. Galbany, H. Gao, M. Gromadzki, C. P. Gutierrez, C. Inserra, E. Kankare, E. A. Magnier, T. E. Mueller-Bravo, A. Reguitti, D. R. Young
Summary: This study presents photometric and spectroscopic observations of the Type Icn supernova (SN) 2021ckj. The observations reveal similar photometric properties and composition to other Type Icn SNe, indicating possible aspherical ejecta and interaction with circumstellar matter. The results of this study shed light on the evolution and formation mechanisms of supernovae.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Ping Chen, Subo Dong, Chris Ashall, S. Benetti, D. Bersier, S. Bose, Joseph Brimacombe, Thomas G. Brink, David A. H. Buckley, Enrico Cappellaro, Grant W. Christie, N. Elias-Rosa, Alexei V. Filippenko, Mariusz Gromadzki, Thomas W. -S. Holoien, Shaoming Hu, C. S. Kochanek, Robert Koff, Juna A. Kollmeier, P. Lundqvist, S. Mattila, Peter A. Milne, J. A. Munoz, Robert Mutel, Tim Natusch, Joel Nicolas, A. Pastorello, Simon Prentice, J. L. Prieto, Tyler Roth, B. J. Shappee, Geoffrey Stone, K. Z. Stanek, M. D. Stritzinger, Todd A. Thompson, Lina Tomasella, Steven Villanueva
Summary: Using data from the Complete Nearby sample of Type Ia Supernovae with a redshift host less than 0.02, a linear relation between two parameters derived from the B - V color curves of Type Ia supernovae (s ( BV ) and s(0)*(B-V) BV ) was found. The s ( BV ) parameter is strongly correlated with peak luminosity, particularly for fast decliners, and this correlation is better than with the classic light-curve width parameters. Therefore, this new linear relation can be used to estimate peak luminosity from s(0)* s ( BV ) (or Δm (15) (B)) measurements.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
D. Eappachen, P. G. Jonker, A. J. Levan, J. Quirola-Vasquez, M. A. P. Torres, F. E. Bauer, V. S. Dhillon, T. Marsh, S. P. Littlefair, M. E. Ravasio, M. Fraser
Summary: Fast X-ray Transients (FXTs) are short-duration X-ray flares with various possible origins. In this study, the X-ray light curve and spectrum, as well as deep optical imaging, of the FXT XRT 210423 were analyzed. No transient optical counterpart was found, but multiple candidate host galaxies were identified. Based on their properties, a binary neutron star merger is favored as the explanation for XRT 210423.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Zhitong Li, Tianmeng Zhang, Xiaofeng Wang, Jujia Zhang, Lluis Galbany, Alexei V. Filippenko, Thomas G. Brink, Chris Ashall, WeiKang Zheng, Thomas de Jaeger, Fabio Ragosta, Maxime Deckers, Mariusz Gromadzki, D. R. Young, Gaobo Xi, Juncheng Chen, Xulin Zhao, Hanna Sai, Shengyu Yan, Danfeng Xiang, Zhihao Chen, Wenxiong Li, Bo Wang, Hu Zou, Jipeng Sui, Jiali Wang, Jun Ma, Jundan Nie, Suijian Xue, Xu Zhou, Zhimin Zhou
Summary: We conducted observations of the peculiar Type Ia supernova 2016ije and found that it is subluminous and exhibits broad light curves, similar to SN 2002es. Our analysis suggests that the explosion of SN 2016ije was less energetic and left a considerable amount of unburned materials in the ejecta. The spectroscopic analysis reveals the presence of significant unburned carbon and a wide line-forming region, indicating a violent merger of a white dwarf binary system.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
A. A. Chrimes, A. J. Levan, J. J. Eldridge, M. Fraser, N. Gaspari, P. J. Groot, J. D. Lyman, G. Nelemans, E. R. Stanway, K. Wiersema
Summary: By using precise proper motion surveys, it is possible to trace the motion of stars near young remnants and search for ejected companions, providing insights into supernova progenitors. The study uses binary population synthesis to make predictions about kinematic and photometric properties of ejected secondary stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Wenxiong Li, Iair Arcavi, Ehud Nakar, Alexei V. Filippenko, Thomas G. Brink, Weikang Zheng, Yi Yang, Marco C. Lam, Ido Keinan, Sean J. Brennan, Noi Shitrit
Summary: In this study, we searched for rapidly evolving transient (RET) candidates using the archival data from the Zwicky Transient Facility public survey between May 2018 and December 2021. Our search identified 19 bona fide RET candidates, corresponding to a discovery rate of around 5.2 events per year. Among these candidates, some were found to be Galactic events, while others were confirmed as extragalactic RETs. The origin of a few events remains undetermined. Our study also placed an upper limit on the volumetric rate of GW170817-like KNe, which can be used for quantifying contaminants in transient alert streams when searching for KNe independently of gravitational-wave and gamma-ray-burst triggers.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Dhvanil D. Desai, Chris Ashall, Benjamin J. Shappee, Nidia Morrell, Lluis Galbany, Christopher R. Burns, James M. DerKacy, Jason T. Hinkle, Eric Hsiao, Sahana Kumar, Jing Lu, Mark M. Phillips, Melissa Shahbandeh, Maximilian D. Stritzinger, Eddie Baron, Melina C. Bersten, Peter J. Brown, Thomas de Jaeger, Nancy Elias-Rosa, Gaston Folatelli, Mark E. Huber, Paolo Mazzali, Tomas E. Muller-Bravo, Anthony L. Piro, Abigail Polin, Nicholas B. Suntzeff, Joseph P. Anderson, Kenneth C. Chambers, Ting-Wan Chen, Thomas de Boer, Michael D. Fulton, Hua Gao, Mariusz Gromadzki, Cosimo Inserra, Eugene A. Magnier, Matt Nicholl, Fabio Ragosta, Richard Wainscoat, David R. Young
Summary: We present observations and analysis of SN 2021bxu, a low-luminosity, fast-evolving Type IIb supernova. It shows a distinct plateau phase and line velocities slower than typical Type IIb SNe. It is photometrically and spectroscopically similar to Ca-rich IIb SNe and likely powered by the decay of Ni-56.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
K. Ertini, G. Folatelli, L. Martinez, M. C. Bersten, J. P. Anderson, C. Ashall, E. Baron, S. Bose, P. J. Brown, C. Burns, J. M. Derkacy, L. Ferrari, L. Galbany, E. Hsiao, S. Kumar, J. Lu, P. Mazzali, N. Morrell, M. Orellana, P. J. Pessi, M. M. Phillips, A. L. Piro, A. Polin, M. Shahbandeh, B. J. Shappee, M. Stritzinger, N. B. Suntzeff, M. Tucker, N. Elias-Rosa, H. Kuncarayakti, C. P. Gutierrez, A. Kozyreva, T. E. Mueller-Bravo, T. -w Chen, J. T. Hinkle, A. Payne, P. Szekely, T. Szalai, B. Barna, R. Koenyves-Toth, D. Banhidi, I. B. Biro, I Csanyi, L. Kriskovits, A. Pal, Zs Szabo, R. Szakats, K. Vida, J. Vinko, M. Gromadzki, L. Harvey, M. Nicholl, E. Paraskeva, D. R. Young, B. Englert
Summary: We present extensive follow-up observations of supernova 2021gno, including photometric and spectroscopic analysis. The supernova belongs to the Calcium-rich transients family and exhibits intermediate luminosity, fast photometric evolution, and double-peaked light curves. The observations suggest that it resulted from the explosion of a highly stripped massive star. The presence of hydrogen features in the spectra and their implications on progenitor scenarios for Calcium-rich transients are also discussed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. Short, A. Lawrence, M. Nicholl, M. Ward, T. M. Reynolds, S. Mattila, C. Yin, I Arcavi, A. Carnall, P. Charalampopoulos, M. Gromadzki, P. G. Jonker, S. Kim, G. Leloudas, I Mandel, F. Onori, M. Pursiainen, S. Schulze, C. Villforth, T. Wevers
Summary: The researchers found a typical nuclear transient phenomenon with characteristics similar to tidal disruption events (TDEs) through optical and X-ray observations. The spectroscopic observations showed strong coronal emission lines and an increase in narrow spectral lines, while the X-ray spectrum underwent significant changes. The researchers proposed that these variations might be related to past TDE events or the activity of the galactic nucleus.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)