Signatures of Bimodality in Nebular Phase Type Ia Supernova Spectra

Abstract

One observational prediction for Type Ia supernova (SNe Ia) explosions produced through white dwarf-white dwarf collisions is the presence of bimodal velocity distributions for the ${}^{56}$Ni decay products, although this signature can also be produced by an off-center ignition in a delayed detonation explosion. These bimodal velocity distributions can manifest as double-peaked or flat-topped spectral features in late-time spectroscopic observations for favorable viewing angles. We present nebular-phase spectroscopic observations of 17 SNe Ia obtained with the Large Binocular Telescope (LBT). Combining these observations with an extensive search of publicly available archival data, we collect a total sample of 48 SNe Ia and classify them based on whether they show compelling evidence for bimodal velocity profiles in three features associated with ${}^{56}$Ni decay products: the [Fe II] and [Fe III] feature at $\sim 5300$ Å, the [Co III] $\lambda 5891$ feature, and the [Co III] and [Fe II] feature at $\sim 6600$ Å. We identify 9 bimodal SNe in our sample, and we find that these SNe have average peak $M_V$ about 0.3 mag fainter than those which do not. This is consistent with theoretical predictions for explosions created by nearly head-on collisions of white dwarfs due to viewing angle effects and ${}^{56}$Ni yields.

arXiv comment12 pages, 4 tables, 6 figures. Accepted for publication in MNRAS

References in corpus (126)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Observational clues to the progenitors of Type-Ia supernovae
• The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae
• WISeREP - An Interactive Supernova Data Repository
• Cosmicflows-2: The Data
• The ACS Nearby Galaxy Survey Treasury
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Cosmicflows-3
• An Empirical Relation between Sodium Absorption and Dust Extinction
• The single degenerate channel for the progenitors of type Ia supernovae
• Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
• An Open Catalog for Supernova Data
• Detonations in Sub-Chandrasekhar Mass C+O White Dwarfs
• A Common Explosion Mechanism for Type Ia Supernovae
• The Carnegie Supernova Project: First Photometry Data Release of Low-Redshift Type Ia Supernovae
• Time Dependent Monte Carlo Radiative Transfer Calculations For 3-Dimensional Supernova Spectra, Lightcurves, and Polarization
• Berkeley Supernova Ia Program I: Observations, Data Reduction, and Spectroscopic Sample of 582 Low-Redshift Type Ia Supernovae
• The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae
• White Dwarf Mass Distribution in the SDSS
• The Carnegie Supernova Project: Light Curve Fitting with SNooPy
• Accelerating Compact Object Mergers in Triple Systems with the Kozai Resonance: A Mechanism for "Prompt" Type Ia Supernovae, Gamma-Ray Bursts, and Other Exotica
• A Compact Degenerate Primary-Star Progenitor of SN 2011fe
• Comparative Direct Analysis of Type Ia Supernova Spectra. II. Maximum Light
• On the Source of the Dust Extinction in Type Ia Supernovae and the Discovery of Anomalously Strong Na I Absorption
• Head-on collisions of white dwarfs in triple systems could explain type Ia supernova
• The Spectroscopic Diversity of Type Ia Supernovae
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• Tidal disruption and ignition of white dwarfs by moderately massive black holes
• The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae
• Infrared Spectra of the Subluminous Type Ia Supernova 1999by
• CfA4: Light Curves for 94 Type Ia Supernovae
• The Long-Term Evolution of Double White Dwarf Mergers
• On the evolution of rapidly rotating massive white dwarfs towards supernovae or collapses
• Constraining the Type Ia Supernova Progenitor: The Search for Hydrogen in Nebular Spectra
• The Unique Type Ia Supernova 2000cx in NGC 524
• The Type Ia Supernova 1998bu in M96 and the Hubble Constant
• Collisions of white dwarfs as a new progenitor channel for type Ia supernovae
• Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant
• The Luminosity of SN 1999by in NGC 2841 and the Nature of `Peculiar' Type Ia Supernovae
• SN 2003du: 480 days in the Life of a Normal Type Ia Supernova
• EVLA Observations Constrain the Environment and Progenitor System of Type Ia Supernova 2011fe
• Hubble Space Telescope spectra of the type Ia supernova SN2011fe: a tail of low-density, high-velocity material with Z<Zsolar
• Rapid Eccentricity Oscillations and the Mergers of Compact Objects in Hierarchical Triples
• Optical Light Curves of the Type Ia Supernovae 1990N and 1991T
• Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Project
• Early and late time VLT spectroscopy of SN 2001el - progenitor constraints for a type Ia supernova
• Have the Elusive Progenitors of Supernovae Type Ia Been Discovered?
• The Initiation and Propagation of Helium Detonations in White Dwarf Envelopes
• ESC and KAIT Observations of the Transitional Type Ia SN 2004eo
• On Type Ia Supernovae From The Collisions of Two White Dwarfs
• Consistent estimates of (56)Ni yields for type Ia supernovae
• Extensive HST Ultraviolet Spectra and Multi-wavelength Observations of SN 2014J in M82 Indicate Reddening and Circumstellar Scattering by Typical Dust
• A Swift Look at SN 2011fe: The Earliest Ultraviolet Observations of a Type Ia Supernova
• The rise of SN2014J in the nearby galaxy M82
• No X-rays from the very nearby Type Ia SN2014J: constraints on its environment
• BVRI lightcurves of supernovae SN 2011fe in M101, SN 2012aw in M95, and SN 2012cg in NGC 4424
• No Stripped Hydrogen in the Nebular Spectra of Nearby Type Ia Supernova 2011fe
• Population synthesis of triple systems in the context of mergers of carbon-oxygen white dwarfs
• Detection of a light echo from SN1998bu
• The normal Type Ia SN 2003hv out to very late phases
• Supernova type Ia luminosities, their dependence on second parameters, and the value of H_0
• ESC observations of SN 2005cf. I. Photometric Evolution of a Normal Type Ia Supernova
• SFI++ II: A New I-band Tully-Fisher Catalog, Derivation of Peculiar Velocities and Dataset Properties
• Signatures of Delayed Detonation, Asymmetry, and Electron Capture in the Mid-Infrared Spectra of Supernovae 2003hv and 2005df
• Hubble Space Telescope studies of low-redshift Type Ia supernovae: Evolution with redshift and ultraviolet spectral trends
• A Synthesis of Data from Fundamental Plane and Surface Brightness Fluctuation Surveys
• Type Ia Supernovae from Merging White Dwarfs I. Prompt Detonations
• Nebular spectra and abundance tomography of the type Ia supernova SN 2011fe: a normal SN Ia with a stable Fe core
• Optical and IR observations of SN 2002dj: some possible common properties of fast expanding SNe Ia
• Type Ia Supernovae with Bi-Modal Explosions Are Common -- Possible Smoking Gun for Direct Collisions of White-Dwarfs
• Abundance stratification in Type Ia Supernovae - II: The rapidly declining, spectroscopically normal SN 2004eo
• Measuring nickel masses in Type Ia supernovae using cobalt emission in nebular phase spectra
• Explaining the type Ia supernova PTF 11kx with a violent-prompt merger scenario
• Searching for swept-up Hydrogen and Helium in the late-time spectra of 11 nearby Type Ia supernovae
• The rate of WD-WD head-on collisions in isolated triples is too low to explain standard type Ia supernovae
• The rate of WD-WD head-on collisions may be as high as the SNe Ia rate
• Photometric Observations of the Type Ia SN 2002er in UGC 10743
• Two transitional type~Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv
• Hydrogen and helium in the spectra of Type Ia supernovae
• 56Ni Production in Double Degenerate White Dwarf Collisions
• No trace of a single-degenerate companion in late spectra of SNe 2011fe and 2014J
• Early Observations and Analysis of the Type Ia SN 2014J in M82
• Strong Evidence Against A Non-Degenerate Companion in SN 2012cg
• Asymmetric Explosion of Type Ia Supernovae as Seen from Near Infrared Observations
• Nebular-Phase Spectra of Nearby Type Ia Supernovae
• Hubble Space Telescope and Ground-Based Observations of the Type Iax Supernovae SN 2005hk and SN 2008A
• The Chemical Distribution in a Subluminous Type Ia Supernova: HST Images of the SN 1885 Remnant
• SN 2012fr: Ultraviolet, Optical, and Near-Infrared Light Curves of a Type Ia Supernova Observed Within a Day of Explosion
• Effects of rotation on the helium burning shell source in accreting white dwarfs
• ASASSN-18tb: A Most Unusual Type Ia Supernova Observed by TESS and SALT
• 500 Days of SN 2013dy: spectra and photometry from the ultraviolet to the infrared
• Berkeley Supernova Ia Program V: Late-Time Spectra of Type Ia Supernovae
• Spectroscopy of the type Ia supernova SN 2002er: days -11 to +215
• Luminosity distributions of Type Ia Supernovae
• Delayed Detonation at a Single Point in Exploding White Dwarfs
• The fast declining Type Ia supernova 2003gs, and evidence for a significant dispersion in near-infrared absolute magnitudes of fast decliners at maximum light
• Nebular Spectroscopy of the `Blue Bump' Type Ia Supernova 2017cbv
• Final Fates of Rotating White Dwarfs and Their Companions in the Single Degenerate Model of Type Ia Supernovae
• Whimper of a Bang: Documenting the Final Days of the Nearby Type Ia Supernova 2011fe
• H-$\alpha$ emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb
• Abundance stratification in Type Ia Supernovae - IV: the luminous, peculiar SN 1991T
• Abundance stratification in Type Ia supernovae - V. SN 1986G bridging the gap between normal and subluminous SNe Ia
• Testing SNe Ia distance measurement methods with SN 2011fe
• No Stripped Companion Material in the Nebular Spectrum of the "Two-Component" Type Ia Supernova ASASSN-18bt
• Early observations of the nearby type Ia supernova SN 2015F
• Simulating Black Hole White Dwarf Encounters
• On the type Ia supernovae 2007on and 2011iv: Evidence for Chandrasekhar-mass explosions at the faint end of the luminosity-width relationship
• Reconciling 56Ni Production in Type Ia Supernovae with Double Degenerate Scenarios
• High resolution simulations of the head-on collision of white dwarfs
• Late-time Flattening of Type Ia Supernova Light Curves: Constraints From SN 2014J in M82
• Zero Impact Parameter White Dwarf Collisions in FLASH
• The nebular spectra of the transitional Type Ia Supernovae 2007on and 2011iv: broad, multiple components indicate aspherical explosion cores
• The first 48: Discovery and progenitor constraints on the Type Ia supernova 2013gy
• Nebular spectroscopy of SN 2014J: Detection of stable nickel in near infrared spectra
• Distribution of ${}^{56}$Ni Yields of Type Ia Supernovae and its Implication for Progenitors
• Physics of SNeIa and Cosmology
• UV-Optical Observation of Type Ia Supernova SN 2013dy in NGC 7250
• Nebular H$\alpha$ Limits for Fast Declining Type Ia Supernovae
• A Significantly off-center Ni56 Distribution for the Low-Luminosity Type Ia Supernova SN 2016brx from the 100IAS survey
• Light curve studies of nearby Type Ia Supernovae with a Multi-band Stretch method
• Absolute Distances to Nearby Type Ia Supernovae via Light Curve Fitting Methods
• SN 2014J at M82: I. A middle-class type Ia supernova by all spectroscopic metrics

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• Supernovae Ia in 2019 (review): a rising demand for spherical explosions
• Strong Calcium Emission Indicates that the Ultraviolet-Flashing Type Ia SN 2019yvq was the Result of a Sub-Chandrasekhar Mass Double-Detonation Explosion
• SN2019yvq Does Not Conform to SN Ia Explosion Models
• Sub-Chandrasekhar-mass detonations are in tension with the observed $t_0-M_{\text{Ni56}}$ relation of type Ia supernovae
• A Rapid Ionization Change in the Nebular-Phase Spectra of the Type Ia SN 2011fe
• The Whisper of a Whimper of a Bang: 2400 Days of the Type Ia SN 2011fe Reveals the Decay of ${}^{55}$Fe
• Nebular-Phase Spectra of Type Ia Supernovae from the Las Cumbres Observatory Global Supernova Project
• Limits on a population of collisional-triples as progenitors of Type-Ia supernovae
• An asymmetric explosion mechanism may explain the diversity of Si II line widths in Type Ia supernovae
• Confronting double-detonation sub-Chandrasekhar models with the low-luminosity suppression of Type Ia supernovae
• Merging White Dwarf Binaries Produce Type Ia Supernovae in Elliptical Galaxies
• The Head-on Collision of a Neutron Star with a White Dwarf
• Dark Matter Thermonuclear Supernova Ignition