Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution

Abstract

We present 888 visual-wavelength spectra of 122 nearby type II supernovae (SNe II) obtained between 1986 and 2009, and ranging between 3 and 363 days post explosion. In this first paper, we outline our observations and data reduction techniques, together with a characterization based on the spectral diversity of SNe~II. A statistical analysis of the spectral matching technique is discussed as an alternative to non-detection constraints for estimating SN explosion epochs. The time evolution of spectral lines is presented and analysed in terms of how this differs for SNe of different photometric, spectral, and environmental properties: velocities, pseudo-equivalent widths, decline rates, magnitudes, time durations, and environment metallicity. Our sample displays a large range in ejecta expansion velocities, from $\sim 9600$ to $\sim 1500$ km s${}^{-1}$ at 50 days post explosion with a median H${}_{\alpha }$ value of 7300 km s${}^{-1}$. This is most likely explained through differing explosion energies. Significant diversity is also observed in the absolute strength of spectral lines, characterised through their pseudo-equivalent widths. This implies significant diversity in both temperature evolution (linked to progenitor radius) and progenitor metallicity between different SNe~II. Around 60\% of our sample show an extra absorption component on the blue side of the H${}_{\alpha }$ P-Cygni profile ("Cachito" feature) between 7 and 120 days since explosion. Studying the nature of Cachito, we conclude that these features at early times (before $\sim 35$ days) are associated with \ion{Si}{2} $\lambda 6355$, while past the middle of the plateau phase they are related to high velocity (HV) features of hydrogen lines.

Accepted for publication in ApJ. 112 pages, 153 figures, 9 tables

References in corpus (73)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• Observational constraints on the progenitors of core-collapse supernovae : the case for missing high mass stars
• The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and Te-based literature data
• Determining the Type, Redshift, and Age of a Supernova Spectrum
• Observed and Physical Properties of Core-Collapse Supernovae
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• The diversity of Type II supernova versus the similarity in their progenitors
• The Carnegie Supernova Project: First Photometry Data Release of Low-Redshift Type Ia Supernovae
• The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae
• The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method
• The Carnegie Supernova Project: The Low-Redshift Survey
• The Carnegie Supernova Project: Second Photometry Data Release of Low-Redshift Type Ia Supernovae
• The Distance to SN 1999em from the Expanding Photosphere Method
• Low Luminosity Type II Supernovae: Spectroscopic and Photometric Evolution
• Type II Supernovae as Standardized Candles
• SN 2005cs in M51 II. Complete Evolution in the Optical and the Near-Infrared
• The Morphology of Type Ia Supernovae Light Curves
• Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
• The progenitor mass of the Type IIP supernova SN 2004et from late-time spectral modeling
• Towards Characterization of the Type IIP Supernova Progenitor Population: a Statistical Sample of Light Curves from Pan-STARRS1
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• Carnegie Supernova Project: Observations of Type IIn supernovae
• The first month of evolution of the slow rising type II-P SN 2013ej in M74
• Photometric and spectroscopic evolution of the type IIP supernova SN 2004et
• Detection of a red supergiant progenitor star of a type II-plateau supernova
• Underluminous Type II Plateau Supernovae: II. Pointing towards moderate mass precursors
• The nebular spectra of SN 2012aw and constraints on stellar nucleosynthesis from oxygen emission lines
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• Photometric and Spectroscopic Properties of Type II-P Supernovae
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• Optical and near infrared coverage of SN 2004et: physical parameters and comparison with other type IIP supernovae
• Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Project
• Quantitative Spectroscopy of Photospheric-Phase Type II Supernovae
• A Sample of Type II-L Supernovae
• The Asiago Supernova Catalogue- 10 years after
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• Optical Signatures of Circumstellar Interaction in Type IIP Supernovae
• On The Intrinsic Diversity of Type II-Plateau Supernovae
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• Hubble Space Telescope imaging of the progenitor sites of six nearby core-collapse supernovae
• The Nickel Mass Distribution of Normal Type II Supernovae
• Quantitative spectroscopic analysis of and distance to SN1999em
• On the Progenitor of the Type II Supernova 2004et in NGC 6946
• Supernova 2012aw - a high-energy clone of archetypal type IIP SN 1999em
• The Type IIP SN 2007od in UGC 12846: from a bright maximum to dust formation in the nebular phase
• H-alpha Spectral diversity of type II supernovae
• The Type IIP Supernova 2012aw in M95: hydrodynamical modelling of the photospheric phase from accurate spectrophotometric monitoring
• Supernova radiative-transfer modeling: A new approach using non-LTE and full time dependence
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• Analysis of blue-shifted emission peaks in type II supernovae
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• Time-dependent Effects in Photospheric-Phase Type II Supernova Spectra
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• Late-Time Optical and UV Spectra of SN 1979C and SN 1980K
• A Global Model of The Light Curves and Expansion Velocities of Type II-Plateau Supernovae
• The Nearby Supernova Factory
• Distance determination to 12 Type II-P Supernovae using the Expanding Photosphere Method
• Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio
• Distance determination to 12 Type II Supernovae using the Expanding Photosphere Method
• The Type II supernovae 2006V and 2006au: two SN 1987A-like events
• Type II supernovae as probes of environment metallicity: observations of host HII regions
• A study of the low-luminosity Type II-Plateau supernova 2008bk
• The effects of dust on the optical and infrared evolution of SN 2004et
• Non-LTE time-dependent spectroscopic modelling of type II-plateau supernovae from the photospheric to the nebular phase: case study for 15 and 25Msun progenitor stars
• Late-time X-Ray, UV and Optical Monitoring of Supernova 1979C

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