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Characterizing the Rapid Hydrogen Disappearance in SN 2022crv: Evidence of a Continuum between Type Ib and IIb Supernova Properties

The Astrophysical Journal American Astronomical Society 974:2 (2024) 316

Authors:

Yize Dong, Stefano Valenti, Chris Ashall, Marc Williamson, David J Sand, Schuyler D Van Dyk, Alexei V Filippenko, Saurabh W Jha, Michael Lundquist, Maryam Modjaz, Jennifer E Andrews, Jacob E Jencson, Griffin Hosseinzadeh, Jeniveve Pearson, Lindsey A Kwok, Teresa Boland, Eric Y Hsiao, Nathan Smith, Nancy Elias-Rosa, Shubham Srivastav, Stephen Smartt, Michael Fulton, WeiKang Zheng, Thomas G Brink, Melissa Shahbandeh, K Azalee Bostroem, Emily Hoang, Daryl Janzen, Darshana Mehta, Nicolas Meza, Manisha Shrestha, Samuel Wyatt, Katie Auchettl, Christopher R Burns, Joseph Farah, Lluís Galbany, Estefania Padilla Gonzalez, Joshua Haislip, Jason T Hinkle, D Andrew Howell, Thomas De Jaeger, Vladimir Kouprianov, Sahana Kumar, Jing Lu, Curtis McCully, Shane Moran, Nidia Morrell, Megan Newsome, Craig Pellegrino, Abigail Polin, Daniel E Reichart, BJ Shappee, Maximilian D Stritzinger, Giacomo Terreran, MA Tucker
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Finding radio transients with anomaly detection and active learning based on volunteer classifications

(2024)

Authors:

Alex Andersson, Chris Lintott, Rob Fender, Michelle Lochner, Patrick Woudt, Jakob van den Eijnden, Alexander van der Horst, Assaf Horesh, Payaswini Saikia, Gregory R Sivakoff, Lilia Tremou, Mattia Vaccari
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SN 2021dbg: A Luminous Type IIP–IIL Supernova Exploding from a Massive Star with a Layered Shell

The Astrophysical Journal American Astronomical Society 973:2 (2024) 155-155

Authors:

Zeyi Zhao, Jujia Zhang, Liping Li, Qian Zhai, Yongzhi Cai, Shubham Srivastav, Xiaofeng Wang, Han Lin, Yi Yang, Alexei V Filippenko, Thomas G Brink, WeiKang Zheng

Abstract:

Abstract We present extensive observations and analysis of supernova (SN) SN 2021dbg, utilizing optical photometry and spectroscopy. For approximately 385 days following the explosion, SN 2021dbg exhibited remarkable luminosity, surpassing most Type II SNe (SNe II). This initial high luminosity is potentially attributed to interaction between the ejected material and the surrounding circumstellar material (CSM), as evidenced by the pronounced interaction signatures observed in its spectra. The subsequent high luminosity is primarily due to the significant 56Ni mass (0.17 ± 0.05 M ⊙) produced in the explosion. Based on the flux of flash emission lines detected in the initial spectra, we estimate that the CSM mass near the progenitor amounted to ∼(1.0–2.0) × 10−3 M ⊙, likely resulting from intense stellar wind activity 2–3 yr preceding the explosion. Considering the bolometric light curve, nebular spectrum modeling, and mass-loss rate, we suggest that the progenitor of SN 2021dbg was a red supergiant (RSG) with a mass of ∼20 M ⊙ and a radius of 1200 R ⊙. This RSG featured a thick hydrogen shell, which may have contained a region with a sharp decrease in material density, electron density, and temperature, contributing to its layered structure. This object demonstrates mixed features of Type IIP and IIL SNe, making it a transitional event linking the above two subclasses of SNe II.
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A new perspective on the stellar mass-metallicity relation of quiescent galaxies from the LEGA-C survey

Astronomy & Astrophysics EDP Sciences 690 (2024) a150

Authors:

Davide Bevacqua, Paolo Saracco, Alina Boecker, Giuseppe D’Ago, Gabriella De Lucia, Roberto De Propris, Francesco La Barbera, Anna Pasquali, Chiara Spiniello, Crescenzo Tortora
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Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag

Astronomy & Astrophysics EDP Sciences 690 (2024) a239

Authors:

A Ulgiati, FM Vincentelli, P Casella, A Veledina, TJ Maccarone, DM Russell, P Uttley, F Ambrosino, MC Baglio, M Imbrogno, A Melandri, SE Motta, K O’Brien, A Sanna, T Shahbaz, D Altamirano, RP Fender, D Maitra, J Malzac
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