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Seeing the Outer Edge of the Infant Type Ia Supernova 2024epr in the Optical and Near Infrared

We present optical-to-near-infrared (NIR) photometry and spectroscopy of the Type Ia supernova (SN Ia) 2024epr, including NIR spectra observed within two days of first light. The early-time optical spectra show strong, high-velocity Ca and…

High Energy Astrophysical Phenomena · Physics 2025-08-21 W. B. Hoogendam , D. O. Jones , C. Ashall , B. J. Shappee , R. J. Foley , M. A. Tucker , M. E. Huber , K. Auchettl , D. D. Desai , A. Do , J. T. Hinkle , S. Romagnoli , J. Shi , A. Syncatto , C. R. Angus , K. C. Chambers , D. A. Coulter , K. W. Davis , T. de Boer , A. Gagliano , M. Kong , C. -C. Lin , T. B. Lowe , E. A. Magnier , P. Minguez , Y. -C. Pan , K. C. Patra , S. A. Severson , K. Taggart , A. R. Wasserman , S. K. Yadavalli , P. Chen , R. S. Post

JWST MIRI/MRS Observations and Spectral Models of the Under-luminous Type Ia Supernova 2022xkq

We present a JWST mid-infrared spectrum of the under-luminous Type Ia Supernova (SN Ia) 2022xkq, obtained with the medium-resolution spectrometer on the Mid-Infrared Instrument (MIRI) $\sim130$ days post-explosion. We identify the first MIR…

High Energy Astrophysical Phenomena · Physics 2023-11-08 J. M. DerKacy , C. Ashall , P. Hoeflich , E. Baron , M. Shahbandeh , B. J. Shappee , J. Andrews , D. Baade , E. F Balangan , K. A. Bostroem , P. J. Brown , C. R. Burns , A. Burrow , A. Cikota , T. de Jaeger , A. Do , Y. Dong , I. Dominguez , O. Fox , L. Galbany , E. T. Hoang , E. Y. Hsiao , D. Janzen , J. E. Jencson , K. Krisciunas , S. Kumar , J. Lu , M. Lundquist , T. B. Mera Evans , J. R. Maund , P. Mazzali , K. Medler , N. E. Meza Retamal , N. Morrell , F. Patat , J. Pearson , M. M. Phillips , M. Shrestha , S. Stangl , C. P. Stevens , M. D. Stritzinger , N. B. Suntzeff , C. M. Telesco , M. A. Tucker , S. Valenti , L. Wang , Y. Yang

Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the $Kepler$ 2 Observations

Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically-confirmed type Ia supernova (SN Ia) observed in the $Kepler$ field. The $Kepler$ data revealed an excess emission in its early light curve, allowing to place interesting…

Solar and Stellar Astrophysics · Physics 2019-01-09 W. Li , X. Wang , J. Vinkó , J. Mo , G. Hosseinzadeh , D. J. Sand , J. Zhang , H. Lin , T. Zhang , L. Wang , J. Zhang , Z. Chen , D. Xiang , L. Rui , F. Huang , X. Li , X. Zhang , L. Li , E. Baron , J. M. Derkacy , X. Zhao , H. Sai , K. Zhang , L. Wang , D. A. Howell , C. McCully , I. Arcavi , S. Valenti , D. Hiramatsu , J. Burke , A. Rest , P. Garnavich , B. E. Tucker , G. Narayan , E. Shaya , S. Margheim , A. Zenteno , A. Villar , G. Dimitriadis , R. J. Foley , Y. -C. Pan , D. A. Coulter , O. D. Fox , S. W. Jha , D. O. Jones , D. N. Kasen , C. D. Kilpatrick , A. L. Piro , A. G. Riess , C. Rojas-Bravo , B. J. Shappee , T. W. -S. Holoien , K. Z. Stanek , M. R. Drout , K. Auchettl , C. S. Kochanek , J. S. Brown , S. Bose , D. Bersier , J. Brimacombe , P. Chen , S. Dong , S. Holmbo , J. A. Muñoz , R. L. Mutel , R. S. Post , J. L. Prieto , J. Shields , D. Tallon , T. A. Thompson , P. J. Vallely , S. Villanueva , S. J. Smartt , K. W. Smith , K. C. Chambers , H. A. Flewelling , M. E. Huber , E. A. Magnier , C. Z. Waters , A. S. B. Schultz , J. Bulger , T. B. Lowe , M. Willman , K. Sárneczky , A. Pál , J. C. Wheeler , A. Bódi , Zs. Bognár , B. Csák , B. Cseh , G. Csörnyei , O. Hanyecz , B. Ignácz , Cs. Kalup , R. Könyves-Tóth , L. Kriskovics , A. Ordasi , I. Rajmon , A. Sódor , R. Szabó , R. Szakáts , G. Zsidi , P. Milne , J. E. Andrews , N. Smith , C. Bilinski , P. J. Brown , J. Nordin , S. C. Williams , L. Galbany , J. Palmerio , I. M. Hook , C. Inserra , K. Maguire , Régis Cartier , A. Razza , C. P. Gutiérrez , J. J. Hermes , J. S. Reding , B. C. Kaiser , J. L. Tonry , A. N. Heinze , L. Denneau , H. Weiland , B. Stalder , G. Barentsen , J. Dotson , T. Barclay , M. Gully-Santiago , C. Hedges , A. M. Cody , S. Howell , J. Coughlin , J. E. Van Cleve , J. Vinícius de Miranda Cardoso , K. A. Larson , K. M. McCalmont-Everton , C. A. Peterson , S. E. Ross , L. H. Reedy , D. Osborne , C. McGinn , L. Kohnert , L. Migliorini , A. Wheaton , B. Spencer , C. Labonde , G. Castillo , G. Beerman , K. Steward , M. Hanley , R. Larsen , R. Gangopadhyay , R. Kloetzel , T. Weschler , V. Nystrom , J. Moffatt , M. Redick , K. Griest , M. Packard , M. Muszynski , J. Kampmeier , R. Bjella , S. Flynn , B. Elsaesser

Optical Observations of the Type Ia Supernova 2011fe in M101 for Nearly 500 Days

We present well-sampled optical observations of the bright Type Ia supernova (SN~Ia) SN 2011fe in M101. Our data, starting from $\sim16$ days before maximum light and extending to $\sim463$ days after maximum, provide an unprecedented time…

High Energy Astrophysical Phenomena · Physics 2016-04-06 Kaicheng Zhang , Xiaofeng Wang , JuJia Zhang , Tianmeng Zhang , Mohan Ganeshalingam , Weidong Li , Alexei V. Filippenko , Xulin Zhao , Weikang Zheng , Jinming Bai , Jia Chen , Juncheng Chen , Fang Huang , Jun Mo , Liming Rui , Hao Song , Hanna Sai , Wenxiong Li , Lifan Wang , Chao Wu

The normal Type Ia SN 2003hv out to very late phases

An extensive dataset for SN 2003hv that covers the flux evolution from maximum light to day +786 is presented. The data are combined with published nebular-phase infrared spectra, and the observations are compared to model light curves and…

Solar and Stellar Astrophysics · Physics 2010-02-17 G. Leloudas , M. D. Stritzinger , J. Sollerman , C. R. Burns , C. Kozma , K. Krisciunas , J. R. Maund , P. Milne , A. V. Filippenko , C. Fransson , M. Ganeshalingam , M. Hamuy , W. Li , M. M. Phillips , B. P. Schmidt , J. Skottfelt , S. Taubenberger , L. Boldt , J. P. U. Fynbo , L. Gonzalez , M. Salvo , J. Thomas-Osip

The First Maximum-Light Ultraviolet through Near-Infrared Spectrum of a Type Ia Supernova

We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Ryan J. Foley , Markus Kromer , G. Howie Marion , Giuliano Pignata , Maximilian D. Stritzinger , Stefan Taubenberger , Peter Challis , Alexei V. Filippenko , Gaston Folatelli , Wolfgang Hillebrandt , Eric Y. Hsiao , Robert P. Kirshner , Weidong Li , Nidia I. Morrell , Friedrich K. Roepke , Franco Ciaraldi-Schoolmann , Ivo R. Seitenzahl , Jeffrey M. Silverman , Robert A. Simcoe , Zachory K. Berta , Kevin M. Ivarsen , Elisabeth R. Newton , Melissa C. Nysewander , Daniel E. Reichart

Nebular Halpha emission in SN Ia 2016jae

There is a wide consensus that type Ia supernovae (SN Ia) originate from the thermonuclear explosion of CO white dwarfs (WD), with the lack of hydrogen in the observed spectra as a distinctive feature. Here, we present SN 2016jae, which was…

Solar and Stellar Astrophysics · Physics 2021-08-25 N. Elias-Rosa , P. Chen , S. Benetti , Subo Dong , J. L. Prieto , E. Cappellaro , J. A. Kollmeier , N. Morrell , A. L. Piro , M. M. Phillips

Optical and Near-Infrared Observations of the Nearby Type Ia Supernova 2017cbv

Supernova (SN) 2017cbv in NGC 5643 is one of a handful of type Ia supernovae (SNe~Ia) reported to have excess blue emission at early times. This paper presents extensive $BVRIYJHK_s$-band light curves of SN 2017cbv, covering the phase from…

High Energy Astrophysical Phenomena · Physics 2020-11-25 Lingzhi Wang , Carlos Contreras , Maokai Hu , Mario A. Hamuy , Eric Y. Hsiao , David J. Sand , Joseph P. Anderson , Chris Ashall , Christopher R. Burns , Juncheng Chen , Tiara R. Diamond , Scott Davis , Francisco Förster , Lluís Galbany , Santiago González-Gaitán , Mariusz Gromadzki , Peter Hoeflich , Wenxiong Li , G. H. Marion , Nidia Morrell , Giuliano Pignata , Jose L. Prieto , Mark M. Phillips , Melissa Shahbandeh , Nicholas Suntzeff , Stefano Valenti , Lifan Wang , Xiaofeng Wang , D. R. Young , Lixin Yu , Jujia Zhang

Optical and Near-infrared Observations of SN 2023ixf for over 600 days after the Explosion

Context.We present a comprehensive photometric and spectroscopic study of the nearby Type II supernova (SN) 2023ixf, with our extensive observations spanning the phases from ~3 to over 600 days after the first light.\\ Aims.The aim of this…

High Energy Astrophysical Phenomena · Physics 2025-04-08 Gaici Li , Xiaofeng Wang , Yi Yang , A. Pastorello , A. Reguitti , G. Valerin , P. Ochner , Yongzhi Cai , T. Iijima , U. Munari , I. Salmaso , A. Farina , R. Cazzola , N. Trabacchin , S. Fiscale , S. Ciroi , A. Mura , A. Siviero , F. Cabras , M. Pabst , S. Taubenberger , C. Vogl , C. Fiorin , Jialian Liu , Liyang Chen , Danfeng Xiang , Jun Mo , Liping Li , Zhenyu Wang , Jujia Zhang , Qian Zhai , D. O. Mirzaqulov , S. A. Ehgamberdiev , Alexei V. Filippenko , Shengyu Yan , Maokai Hu , Xiaoran Ma , Qiqi Xia , Xing Gao , Wenxiong Li

The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days

$UBVRI$ photometry and medium resolution optical spectroscopy of peculiar Type Ia supernova SN 2005hk are presented and analysed, covering the pre-maximum phase to around 400 days after explosion. The supernova is found to be underluminous…

Astrophysics · Physics 2009-11-13 D. K. Sahu , Masaomi Tanaka , G. C. Anupama , Koji S. Kawabata , Keiichi Maeda , Nozomu Tominaga , Ken'ichi Nomoto , Paolo A. Mazzali , T. P. Prabhu

Very Early Ultraviolet and Optical Observations of the Type Ia Supernova 2009ig

Supernova (SN) 2009ig was discovered 17 hours after explosion by the Lick Observatory Supernova Search, promptly classified as a normal Type Ia SN (SN Ia), peaked at V = 13.5 mag, and was equatorial, making it one of the foremost supernovae…

Solar and Stellar Astrophysics · Physics 2015-05-30 Ryan J. Foley , P. J. Challis , A. V. Filippenko , M. Ganeshalingam , W. Landsman , W. Li , G. H. Marion , J. M. Silverman , R. L. Beaton , V. N. Bennert , S. B. Cenko , M. Childress , P. Guhathakurta , L. Jiang , J. S. Kalirai , R. P. Kirshner , A. Stockton , E. Tollerud , J. Vinko , J. C. Wheeler , J. -H. Woo

500 Days of SN 2013dy: spectra and photometry from the ultraviolet to the infrared

SN 2013dy is a Type Ia supernova for which we have compiled an extraordinary dataset spanning from 0.1 to ~ 500 days after explosion. We present 10 epochs of ultraviolet (UV) through near-infrared (NIR) spectra with HST/STIS, 47 epochs of…

High Energy Astrophysical Phenomena · Physics 2015-08-19 Y. -C. Pan , R. J. Foley , M. Kromer , O. D. Fox , W. Zheng , P. Challis , K. I. Clubb , A. V. Filippenko , G. Folatelli , M. L. Graham , W. Hillebrandt , R. P. Kirshner , W. H. Lee , R. Pakmor , F. Patat , M. M. Phillips , G. Pignata , F. Ropke , I. Seitenzahl , J. M. Silverman , J. D. Simon , A. Sternberg , M. D. Stritzinger , S. Taubenberger , J. Vinko , J. C. Wheeler

Early Blue Excess from the Type Ia Supernova 2017cbv and Implications for Its Progenitor

We present very early, high-cadence photometric observations of the nearby Type Ia SN 2017cbv. The light curve is unique in that it has a blue bump during the first five days of observations in the U, B, and g bands, which is clearly…

High Energy Astrophysical Phenomena · Physics 2017-08-16 Griffin Hosseinzadeh , David J. Sand , Stefano Valenti , Peter Brown , D. Andrew Howell , Curtis McCully , Daniel Kasen , Iair Arcavi , K. Azalee Bostroem , Leonardo Tartaglia , Eric Y. Hsiao , Scott Davis , Melissa Shahbandeh , Maximilian D. Stritzinger

Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf

We present photometric and spectroscopic data for the nearby Type I supernova (SN Ia) 2019eix (originally classified as a SN Ic), from its discovery day up to 100 days after maximum brightness. Before maximum light SN 2019eix resembles a…

High Energy Astrophysical Phenomena · Physics 2023-08-09 E. Padilla Gonzalez , D. Andrew Howell , J. Burke , Yize Dong , D. Hiramatsu , C. McCully , C. Pellegrino , W. Kerzendorf , M. Modjaz , G. Terreran , M. Williamson

SN 2012fr: Ultraviolet, Optical, and Near-Infrared Light Curves of a Type Ia Supernova Observed Within a Day of Explosion

We present detailed ultraviolet, optical and near-infrared light curves of the Type Ia supernova (SN) 2012fr, which exploded in the Fornax cluster member NGC 1365. These precise high-cadence light curves provide a dense coverage of the flux…

High Energy Astrophysical Phenomena · Physics 2018-06-06 Carlos Contreras , M. M. Phillips , Christopher R. Burns , Anthony L. Piro , B. J. Shappee , Maximilian D. Stritzinger , C. Baltay , Peter J. Brown , Emmanuel Conseil , Alain Klotz , Peter E. Nugent , Damien Turpin , Stu Parker , D. Rabinowitz , Eric Y. Hsiao , Nidia Morrell , Abdo Campillay , Sergio Castellón , Carlos Corco , Consuelo González , Kevin Krisciunas , Jacqueline Serón , Brad E. Tucker , E. S. Walker , E. Baron , C. Cain , Michael J. Childress , Gastón Folatelli , Wendy L. Freedman , Mario Hamuy , P. Hoeflich , S. E. Persson , Richard Scalzo , Brian Schmidt , Nicholas B. Suntzeff

Nebular-Phase Spectra of Nearby Type Ia Supernovae

We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at $>200$ days after peak brightness using the Gemini South and Keck telescopes. All of the SNe Ia in our sample were nearby, well separated from their host galaxy's…

High Energy Astrophysical Phenomena · Physics 2017-11-08 Melissa L. Graham , Sahana Kumar , Griffin Hosseinzadeh , Daichi Hiramatsu , Iair Arcavi , D. Andrew Howell , Stefano Valenti , David J. Sand , Jerod T. Parrent , Curtis McCully , Alexei V. Filippenko

Type Ia SN 2019ein: New Insights into the Similarities and diversities among High-Velocity SNe Ia

We present optical observations of type Ia supernova (SN) 2019ein, starting at 2 days after the estimated explosion date. The spectra and the light curves show that SN 2019ein belongs to the High-Velocity (HV) and Bload Line groups with…

High Energy Astrophysical Phenomena · Physics 2020-05-06 Miho Kawabata , Keiichi Maeda , Masayuki Yamanaka , Tatsuya Nakaoka , Koji Kawabata , Ryo Adachi , Hiroshi Akitaya , Umut Burgaz , Hidekazu Hanayama , Takashi Horiuchi , Ryohei Hosokawa , Kota Iida , Fumiya Imazato , Keisuke Isogai , Ji-an Jiang , Noriyuki Katoh , Hiroki Kimura , Masaru Kino , Daisuke Kuroda , Hiroyuki Maehara , Kazuya Matsubayashi , Kumiko Morihana , Katsuhiro Murata , Takashi Nagao , Masafumi Niwano , Daisaku Nogami , Motoki Oeda , Tatsuharu Ono , Hiroki Onozato , Masaaki Otsuka , Tomoki Saito , Mahito Sasada , Kazuki Shiraishi , Haruki Sugiyama , Kenta Taguchi , Jun Takahashi , Kengo Takagi , Seiko Takagi , Masaki Takayama , Miyako Tozuka , Kazuhiro Sekiguchi

The Oxygen Features in Type Ia Supernovae and the Implications for the Nature of Thermonuclear Explosions

The absorption feature O I 7773 is an important spectral indicator for type Ia supernovae (SNe~Ia) that can be used to trace the unburned material at outer layers of the exploding white dwarf. In this work, we use a large sample of SNe~Ia…

High Energy Astrophysical Phenomena · Physics 2016-08-08 Xulin Zhao , Keiichi Maeda , Xiaofeng Wang , Lifan Wang , Hanna Sai , Jujia Zhang , Tianmeng Zhang , Fang Huang , Liming Rui

No evidence of circumstellar gas surrounding Type Ia Supernova SN 2017cbv

Nearby type Ia supernovae (SNe Ia), such as SN 2017cbv, are useful events to address the question of what the elusive progenitor systems of the explosions are. Hosseinzadeh et al. (2017) suggested that the early blue excess of the…

Solar and Stellar Astrophysics · Physics 2017-12-27 Raphael Ferretti , Rahman Amanullah , Mattia Bulla , Ariel Goobar , Joel Johansson , Peter Lundqvist

Nebular-Phase Spectra of Type Ia Supernovae from the Las Cumbres Observatory Global Supernova Project

The observed diversity in Type Ia supernovae (SNe Ia) -- the thermonuclear explosions of carbon-oxygen white dwarf stars used as cosmological standard candles -- is currently met with a variety of explosion models and progenitor scenarios.…

High Energy Astrophysical Phenomena · Physics 2022-02-09 M. L. Graham , T. D. Kennedy , S. Kumar , R. C. Amaro , D. J. Sand , S. W. Jha , L. Galbany , J. Vinko , J. C. Wheeler , E. Y. Hsiao , K. A. Bostroem , J. Burke , D. Hiramatsu , G. Hosseinzadeh , C. McCully , D. A. Howell , T. Diamond , P. Hoeflich , X. Wang , W. Li