Flash ionization signatures in the type Ibn supernova SN 2019uo

Abstract

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 decline of 0.1 mag d${}^{-1}$ similar to most of the SNe Ibn, but is fainter ($M_{max}^V=-18.30\pm 0.24$ mag) than a typical SN Ibn and shows a color evolution that places it between SNe Ib and the most extreme SNe Ibn. SN 2019uo shows P-cygni He I features in the early spectra which gradually evolves and becomes emission dominated post peak. It also shows faster evolution in line velocities as compared to most other members of the type Ibn subclass. The bolometric light curve is fairly described by a ${}^{56}$Ni + circumstellar interaction model.

arXiv comment14 figures, 4 tables, Accepted for publication in ApJ, Corner plots are put in low resolution due to size limitations, please contact authors for original figure

References in corpus (36)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
• An Empirical Relation between Sodium Absorption and Dust Extinction
• A giant outburst two years before the core-collapse of a massive star
• The diversity of Type II supernova versus the similarity in their progenitors
• A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
• Generalized Semi-Analytical Models of Supernova Light Curves
• Bolometric light curves and explosion parameters of 38 stripped-envelope core-collapse supernovae
• SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
• Flash Spectroscopy: Emission Lines from the Ionized Circumstellar Material around $<10$-Day-Old Type II Supernovae
• Unifying Type II Supernova Light Curves with Dense Circumstellar Material
• Optical and Infrared Spectroscopy of the type IIn SN 1998S : Days 3-127
• Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
• Carnegie Supernova Project: Observations of Type IIn supernovae
• The first month of evolution of the slow rising type II-P SN 2013ej in M74
• Dust Formation and He II 4686 emission in the Dense Shell of the Peculiar Type Ib Supernova 2006jc
• The bolometric light curves and physical parameters of stripped-envelope supernovae
• Investigating the properties of stripped-envelope supernovae, what are the implications for their progenitors?
• SN 2009jf: a slow-evolving stripped-envelope core-collapse supernova
• Superluminous Light Curves from Supernovae Exploding in a Dense Wind
• Type Ibn Supernovae Show Photometric Homogeneity and Spectral Diversity at Maximum Light
• Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
• Massive stars exploding in a He-rich circumstellar medium. IV. Transitional Type Ibn Supernovae
• Massive stars exploding in a He-rich circumstellar medium - IX. SN 2014av, and characterization of Type Ibn SNe
• Supernovae and their host galaxies. I. The SDSS DR8 database and statistics
• The bumpy light curve of supernova iPTF13z
• PS1-12sk is a Peculiar Supernova From a He-rich Progenitor System in a Brightest Cluster Galaxy Environment
• SN 2015U: A Rapidly Evolving and Luminous Type Ibn Supernova
• Type Ibn Supernovae May not all Come from Massive Stars
• Origins of Type Ibn SNe 2006jc/2015G in interacting binaries and implications for pre-SN eruptions
• Massive stars exploding in a He-rich circumstellar medium. V. Observations of the slow-evolving SN Ibn OGLE-2012-SN-006
• Massive stars exploding in a He-rich circumstellar medium. VI. Observations of two distant Type Ibn supernova candidates discovered by La Silla-QUEST
• iPTF13beo: The Double-Peaked Light Curve of a Type Ibn Supernova Discovered Shortly after Explosion
• A Multiple Ejecta-Circumstellar Medium Interaction Model and Its Implications for Superluminous Supernovae iPTF15esb and iPTF13dcc
• Massive stars exploding in a He-rich circumstellar medium - VII. The metamorphosis of ASASSN-15ed from a narrow line Type Ibn to a normal Type Ib Supernova
• Bolometric Lightcurves of Peculiar Type II-P Supernovae

Cited by in corpus (19)

• Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
• A Diversity of Wave-driven Pre-supernova Outbursts
• The ANTARES Astronomical Time-Domain Event Broker
• The Early Phases of Supernova 2020pni: Shock-Ionization of the Nitrogen-Enriched Circumstellar Material
• Circumstellar Interaction Powers the Light Curves of Luminous Rapidly Evolving Optical Transients
• Wave-driven outbursts and variability of low-mass supernova progenitors
• Variable thermal energy injection from magnetar spin down as a possible cause of stripped-envelope supernova light-curve bumps
• SN 2018gjx reveals that some SNe Ibn are SNe IIb exploding in dense circumstellar material
• Probing the circum-stellar medium 2.8 Gyr after the Big Bang: detection of Bowen fluorescence in the Sunburst arc
• Mass-transferring binary stars as progenitors of interacting hydrogen-free supernovae
• SN 2020bqj: a Type Ibn supernova with a long lasting peak plateau
• The Type Ibn Supernova 2019kbj -- Indications for Diversity in Type Ibn Supernova Progenitors
• Evolution of A Peculiar Type Ibn Supernova SN 2019wep
• ASASSN-14ms:the Most Energetic Known Explosion of a Type Ibn Supernova and its Physical Origin
• Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej
• Massive stars exploding in a He-rich circumstellar medium $-$ X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt
• Insights into the Properties of Type Ibn/Icn Supernovae and Their Progenitor Channels through X-ray Emission
• SN 2024abvb: A Type Icn Supernova in the Outskirts of its Host Galaxy
• A global look into the world of interacting supernovae