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SN 2014J in M82: New Insights On the Spectral Diversity of Type Ia Supernovae

We present extensive spectroscopic observations for one of the closest type Ia supernovae (SNe Ia), SN 2014J discovered in M82, ranging from 10.4 days before to 473.2 days after B-band maximum light. The diffuse interstellar band (DIB)…

Solar and Stellar Astrophysics · Physics 2018-08-29 Kaicheng Zhang , Xiaofeng Wang , JuJia Zhang , Tianmeng Zhang , S. Benetti , N. Elias-Rosa , Fang Huang , Han Lin , Linyi Li , Wenxiong Li , P. Ochner , A. Pastorello , Liming Rui , L. Tartaglia , L. Tomasella , A. Siviero , U. Munari , G. Terreran , Hao Song , S. Taubenberger , J. Craig Wheeler , Danfeng Xiang , Xulin Zhao , Hongbin Li , Jinming Bai , Xiaojun Jiang , Jianrong Shi , Zhenyu Wu

SN 2006gy: An extremely luminous supernova in the galaxy NGC 1260

With an extinction-corrected V-band peak absolute magnitude of about -22, supernova (SN) 2006gy is probably the brightest SN ever observed. We report on multi-wavelength observations of this SN and its environment. Our spectroscopy shows an…

Astrophysics · Physics 2009-11-11 E. O. Ofek , P. B. Cameron , M. M. Kasliwal , A. Gal-Yam , A. Rau , S. R. Kulkarni , D. A. Frail , P. Chandra , S. B. Cenko , A. M. Soderberg , S. Immler

The Type Ia Supernova 1998bu in M96 and the Hubble Constant

We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29 spectra of SN 1998bu between UT 1998 May 11 and…

Astrophysics · Physics 2009-10-31 S. Jha , P. Garnavich , R. Kirshner , P. Challis , A. Soderberg , L. Macri , J. Huchra , P. Barmby , E. Barton , P. Berlind , W. Brown , N. Caldwell , M. Calkins , S. Kannappan , D. Koranyi , M. Pahre , K. Rines , K. Stanek , R. Stefanik , A. Szentgyorgyi , P. Vaisanen , Z. Wang , J. Zajac , A. Riess , A. Filippenko , W. Li , M. Modjaz , R. Treffers , C. Hergenrother , E. Grebel , P. Seitzer , G. Jacoby , P. Benson , A. Rizvi , L. Marschall , J. Goldader , M. Beasley , W. Vacca , B. Leibundgut , J. Spyromilio , B. Schmidt , P. Wood

Parameters of the type-IIP supernova SN 2012aw

We present the results the photometric observations of the Type IIP supernova SN 2012aw obtained for the time interval from 7 till 371 days after the explosion. Using the previously published values of the photospheric velocities we've…

High Energy Astrophysical Phenomena · Physics 2021-04-28 A. A. Nikiforova , P. V. Baklanov , S. I. Blinnikov , D. A. Blinov , T. S. Grishina , Yu. V. Troitskaya , D. A. Morozova , E. N. Kopatskaya , E. G. Larionova , I. S. Troitsky

SN 2019ein: A Type Ia Supernova Likely Originated from a Sub-Chandrasekhar-Mass Explosion

We present extensive optical photometric and spectroscopic observations for the nearby Type Ia supernova (SN Ia) 2019ein, spanning the phases from $\sim 3$ days to $\sim 330$ days after the explosion. This SN Ia is characterized by…

High Energy Astrophysical Phenomena · Physics 2022-10-12 Gaobo Xi , Xiaofeng Wang , Wenxiong Li , Jun Mo , Jujia Zhang , Jialian Liu , Zhihao Chen , Alexei V. Filippenko , Weikang Zheng , Thomas G. Brink , Xinghan Zhang , Hanna Sai , Shuhrat A. Ehgamberdiev , Davron Mirzaqulov , Jicheng Zhang

Flash ionization signatures in the type Ibn supernova SN 2019uo

We present photometric and spectroscopic observations of the type Ibn supernova (SN) 2019uo, the second ever SN Ibn with flash ionization (He II, C III, N III) features in its early spectra. SN 2019uo displays a rapid post-peak luminosity…

High Energy Astrophysical Phenomena · Physics 2020-02-12 Anjasha Gangopadhyay , Kuntal Misra , Daichi Hiramatsu , Shan-Qin Wang , Griffin Hosseinzadeh , Xiaofeng Wang , Stefano Valenti , Jujia Zhang , D. Andrew Howell , Iair Arcavi , G. C. Anupama , Jamison Burke , Raya Dastidar , Koichi Itagaki , Brajesh Kumar , Brijesh Kumar , Long Li , Curtis McCully , Jun Mo , Shashi Bhushan Pandey , Craig Pellegrino , Hanna Sai , D. K. Sahu , Pankaj Sanwal , Avinash Singh , Mridweeka Singh , Jicheng Zhang , Tianmeng Zhang , Xinhan Zhang

Optical Observations of the 2002cx-like Supernova 2014ek, and Characterizations of SNe Iax

We present optical observations of supernova (SN) 2014ek discovered during the Tsinghua-NAOC Transient Survey (TNTS), which shows properties that are consistent with those of SN 2002cx-like events (dubbed as SNe Iax). The photometry…

High Energy Astrophysical Phenomena · Physics 2018-07-18 Linyi Li , Xiaofeng Wang , Jujia Zhang , Iair Arcavi , Tianmeng Zhang , Liming Rui , Griffin Hosseinzadeh , D. Andrew Howell , Curtis McCully , Kaicheng Zhang , Stefano Valenti , Jun Mo , Wenxiong Li , Fang Huang , Danfeng Xiang , Lifan Wang , Xu Zhou

Direct Analysis of Spectra of Type Ib Supernovae

Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to photospheric-phase spectra of Type Ib supernovae (SNe Ib). Although the synthetic spectra are based on many simplifying…

Astrophysics · Physics 2009-11-06 David Branch

Supernova 2018cuf: A Type IIP supernova with a slow fall from plateau

We present multi-band photometry and spectroscopy of SN 2018cuf, a Type IIP ("P" for plateau) supernova (SN) discovered by the Distance Less Than 40 Mpc survey (DLT40) within 24 hours of explosion. SN 2018cuf appears to be a typical Type…

High Energy Astrophysical Phenomena · Physics 2021-01-13 Yize Dong , S. Valenti , K. A. Bostroem , D. J. Sand , Jennifer E. Andrews , L. Galbany , Saurabh W. Jha , Youssef Eweis , Lindsey Kwok , E. Y. Hsiao , Scott Davis , Peter J. Brown , H. Kuncarayakti , Keiichi Maeda , Jeonghee Rho , R. C. Amaro , J. P. Anderson , Iair Arcavi , Jamison Burke , Raya Dastidar , "Gastón Folatelli" , Joshua Haislip , Daichi Hiramatsu , Griffin Hosseinzadeh , D. Andrew Howell , J. Jencson , Vladimir Kouprianov , M. Lundquist , J. D. Lyman , Curtis McCully , Kuntal Misra , Daniel E. Reichart , "S. F. Sánchez" , Nathan Smith , Xiaofeng Wang , Lingzhi Wang , S. Wyatt

SN 2013ai: a link between hydrogen-rich and hydrogen-poor core-collapse supernovae

We present a study of optical and near-infrared (NIR) spectra along with the light curves of SN 2013ai. These data range from discovery until 380 days after explosion. SN 2013ai is a fast declining type II supernova (SN II) with an…

High Energy Astrophysical Phenomena · Physics 2021-03-24 S. Davis , P. J. Pessi , M. Fraser , K. Ertini , L. Martinez , P. Hoeflich , E. Y. Hsiao , G. Folatelli , C. Ashall , M. M. Phillips , J. P. Anderson , M. Bersten , B. Englert , A. Fisher , S. Benetti , A. Bunzel , C. Burns , T. W. Chen , C. Contreras , N. Elias-Rosa , E. Falco , L. Galbany , R. P. Kirshner , S. Kumar , J. Lu , J. D. Lyman , G. H. Marion , S. Mattila , J. Maund , N. Morrell , J. Serón , M. Stritzinger , M. Shahbandeh , M. Sullivan , N. B. Suntzeff , D. R. Young

Massive stars exploding in a He-rich circumstellar medium. IV. Transitional Type Ibn Supernovae

We present ultraviolet, optical and near-infrared data of the Type Ibn supernovae (SNe) 2010al and 2011hw. SN 2010al reaches an absolute magnitude at peak of M(R) = -18.86 +- 0.21. Its early light curve shows similarities with normal SNe…

Solar and Stellar Astrophysics · Physics 2015-06-23 A. Pastorello , S. Benetti , P. J. Brown , D. Y. Tsvetkov , C. Inserra , S. Taubenberger , L. Tomasella , M. Fraser , D. J. Rich , M. T. Botticella , F. Bufano , E. Cappellaro , M. Ergon , E. S. Gorbovskoy , A. Harutyunyan , F. Huang , R. Kotak , V. M. Lipunov , L. Magill , M. Miluzio , N. Morrell , P. Ochner , S. J. Smartt , J. Sollerman , S. Spiro , M. D. Stritzinger , M. Turatto , S. Valenti , X. Wang , D. E. Wright , V. V. Yurkov , L. Zampieri , T. Zhang

SN 2009kf : a UV bright type IIP supernova discovered with Pan-STARRS 1 and GALEX

We present photometric and spectroscopic observations of a luminous type IIP Supernova 2009kf discovered by the Pan-STARRS 1 (PS1) survey and detected also by GALEX. The SN shows a plateau in its optical and bolometric light curves, lasting…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 M. T. Botticella , C. Trundle , A. Pastorello , S. Rodney , A. Rest , S. Gezari , S. J. Smartt , G. Narayan , M. E. Huber , J. L. Tonry , D. Young , K. Smith , F. Bresolin , S. Valenti , R. Kotak , S. Mattila , E. Kankare , W. M. Wood-Vasey , A. Riess , J. D. Neill , K. Forster , D. C. Martin , C. W. Stubbs , W. S. Burgett , K. C. Chambers , T. Dombeck , H. Flewelling , T. Grav , J. N. Heasley , K. W. Hodapp , N. Kaiser , R. Kudritzki , G. Luppino , R. H. Lupton , E. A. Magnier , D. G. Monet , J. S. Morgan , P. M. Onaka , P. A. Price , P. H. Rhoads , W. A. Siegmund , W. E. Sweeney , R. J. Wainscoat , C. Waters , M. F. Waterson , C. G. Wynn-Williams

Supersolar Ni/Fe production in the Type IIP SN 2012ec

SN 2012ec is a Type IIP supernova (SN) with a progenitor detection and comprehensive photospheric-phase observational coverage. Here, we present Very Large Telescope and PESSTO observations of this SN in the nebular phase. We model the…

Solar and Stellar Astrophysics · Physics 2015-06-23 Anders Jerkstrand , Stephen J. Smartt , Jesper Sollerman , Cosimo Inserra , Morgan Fraser , Jason Spyromilio , Claes Fransson , Ting-Wan Chen , Cristina Barbarino , Massimo Dall'Ora , Maria Teresa Botticella , Massimo Della Valle , Avishay Gal-Yam , Stefano Valenti , Kate Maguire , Paolo Mazzali , Lina Tomasella

Observations of the Very Young Type Ia Supernova 2019np with Early-excess Emission

Early-time radiative signals from type Ia supernovae (SNe Ia) can provide important constraints on the explosion mechanism and the progenitor system. We present observations and analysis of SN 2019np, a nearby SN Ia discovered within 1-2…

High Energy Astrophysical Phenomena · Physics 2022-06-08 Hanna Sai , Xiaofeng Wang , Nancy Elias-Rosa , Yi Yang , Jujia Zhang , Weili Lin , Jun Mo , Anthony L. Piro , Xiangyun Zeng , Reguitti Andrea , Peter Brown , Christopher R. Burns , Yongzhi Cai , Achille Fiore , Eric Y. Hsiao , Jordi Isern , K. Itagaki , Wenxiong Li , Zhitong Li , Priscila J. Pessi , M. M. Phillips , Stefan Schuldt , Melissa Shahbandeh , Maximilian D. Stritzinger , Lina Tomasella , Christian Vogl , Bo Wang , Lingzhi Wang , Chengyuan Wu , Sheng Yang , Jicheng Zhang , Tianmeng Zhang , Xinghan Zhang

Supernova 2000cb: high-energy version of SN 1987A

Among type IIP supernovae there are a few events that resemble the well-studied supernova 1987A produced by the blue supergiant in the Large Magellanic Cloud. We study a peculiar supernova 2000cb and compare it with the supernova 1987A. We…

Solar and Stellar Astrophysics · Physics 2015-05-28 V. P. Utrobin , N. N. Chugai

Optical Observations of the Type Ic Supernova 2007gr in NGC 1058 and Implications for the Properties of its Progenitor

We present extensive optical observations of the normal Type Ic supernova (SN) 2007gr, spanning from about one week before maximum light to more than one year thereafter. The optical light and color curves of SN 2007gr are very similar to…

High Energy Astrophysical Phenomena · Physics 2015-07-15 Juncheng Chen , Xiaofeng Wang , Mohan Ganeshalingam , Jeffrey M. Silverman , Alexei V. Filippenko , Weidong Li , Ryan Chornock , Junzheng Li , Thea Steele

Spectropolarimetric Evolution Reveals Dual-Axis Ejecta in the Atypical Magnetar-Powered SN 2012au

We present six epochs of optical spectropolarimetric observations of the unique and slow-evolving Type Ib supernova (SN) 2012au, between 0 and 295 days post R-band maximum. The polarization levels seen throughout our observations are on…

High Energy Astrophysical Phenomena · Physics 2025-11-17 Sabrina DeSoto , JenniferL. Hoffman , G. Grant Williams , Christopher Bilinski , Douglas C. Leonard , Peter A. Milne , Christopher Pickens , Manisha Shrestha , Nathan Smith , Paul S. Smith

Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej

We present the photometric and spectroscopic analysis of five Type Ibn supernovae (SNe): SN 2020nxt, SN 2020taz, SN 2021bbv, SN 2023utc, and SN 2024aej. These events share key observational features and belong to a family of objects similar…

High Energy Astrophysical Phenomena · Physics 2025-08-27 Z. -Y. Wang , A. Pastorello , Y. -Z. Cai , M. Fraser , A. Reguitti , W. -L. Lin , L. Tartaglia , D. Andrew Howell , S. Benetti , E. Cappellaro , Z. -H. Chen , N. Elias-Rosa , J. Farah , A. Fiore , D. Hiramatsu , E. Kankare , Z. -T. Li , P. Lundqvist , P. A. Mazzali , C. McCully , J. Mo , S. Moran , M. Newsome , E. Padilla Gonzalez , C. Pellegrino , Z. -H. Peng , S. J. Smartt , S. Srivastav , M. D. Stritzinger , G. Terreran , L. Tomasella , G. Valerin , G. -J. Wang , X. -F. Wang , T. de Boer , K. C. Chambers , H. Gao , F. -Z. Guo , C. P. Guti'errez , T. Kangas , E. Karamehmetoglu , G. -C. Li , C. -C. Lin , T. B. Lowe , X. -R. Ma , E. A. Magnier , P. Minguez , S. -P. Pei , T. M. Reynolds , R. J. Wainscoat , B. Wang , S. Williams , C. -Y. Wu , J. -J. Zhang , X. -H. Zhang , X. -J. Zhu

SN~2015da: Late-time observations of a persistent superluminous Type~IIn supernova with post-shock dust formation

We present photometry and spectroscopy of the slowly evolving superluminous Type IIn SN2015da. SN2015da is extraordinary for its very high peak luminosity, and also for sustaining a high luminosity for several years. Even at 8\,yr after…

High Energy Astrophysical Phenomena · Physics 2023-12-04 Nathan Smith , Jennifer E. Andrews , Peter Milne , Alexei V. Filippenko , Thomas G. Brink , Patrick L. Kelly , Heechan Yuk , Jacob E. Jencson

Optical and Near-IR Observations of the Faint and Fast 2008ha-like Supernova 2010ae

A comprehensive set of optical and near-infrared (NIR) photometry and spectroscopy is presented for the faint and fast 2008ha-like supernova (SN) 2010ae. Contingent on the adopted value of host extinction, SN 2010ae reached a peak…

High Energy Astrophysical Phenomena · Physics 2015-06-17 M. D. Stritzinger , E. Hsiao , S. Valenti , F. Taddia , T. J. Rivera-Thorsen , G. Leloudas , K. Maeda , A. Pastorello , M. M. Phillips , G. Pignata , E. Baron , C. R. Burns , C. Contreras , G. Folatelli , M. Hamuy , P. Hoeflich , N. Morrell , J. L. Prieto , S. Benetti , A. Campillay , J. B. Haislip , A. P. LaClutze , J. P. Moore , D. E. Reichart