Optimal Classification and Outlier Detection for Stripped-Envelope Core-Collapse Supernovae

Abstract

In the current era of time-domain astronomy, it is increasingly important to have rigorous, data driven models for classifying transients, including supernovae. We present the first application of Principal Component Analysis to the spectra of stripped-envelope core-collapse supernovae. We use one of the largest compiled optical datasets of stripped-envelope supernovae, containing 160 SNe and 1551 spectra. We find that the first 5 principal components capture 79\% of the variance of our spectral sample, which contains the main families of stripped supernovae: Ib, IIb, Ic and broad-lined Ic. We develop a quantitative, data-driven classification method using a support vector machine, and explore stripped-envelope supernovae classification as a function of phase relative to V-band maximum light. Our classification method naturally identifies "transition" supernovae and supernovae with contested labels, which we discuss in detail. We find that the stripped-envelope supernovae types are most distinguishable in the later phase ranges of $10\pm 5$ days and $15\pm 5$ days relative to V-band maximum, and we discuss the implications of our findings for current and future surveys such as ZTF and LSST.

11 pages, 5 figures, 1 table, Published in ApJL (questions and comments welcome). Link to code: https://github.com/nyusngroup/SESNspectraPCA

References in corpus (42)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Supernova -- Gamma-Ray Burst Connection
• WISeREP - An Interactive Supernova Data Repository
• Determining the Type, Redshift, and Age of a Supernova Spectrum
• The First Systematic Study of Type Ibc Supernova Multi-band Light Curves
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• The Observer's Guide to the Gamma-Ray Burst-Supernova Connection
• Optical Spectroscopy of Type Ib/c Supernovae
• Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
• Optical Spectra of 73 Stripped-Envelope Core-Collapse Supernovae
• The Spectral SN-GRB Connection: Systematic Spectral Comparisons between Type Ic Supernovae, and broad-lined Type Ic Supernovae with and without Gamma-Ray Bursts
• Core-Collapse Supernovae and Host Galaxy Stellar Populations
• PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806
• Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex
• Analyzing the Largest Spectroscopic Dataset of Stripped Supernovae to Improve Their Identifications and Constrain Their Progenitors
• Spectra of Hydrogen-Poor Superluminous Supernovae from the Palomar Transient Factory
• Two Type Ic supernovae in low-metallicity, dwarf galaxies: diversity of explosions
• The Radio Evolution of the Ordinary Type Ic SN 2002ap
• The Fast and Furious Decay of the Peculiar Type Ic Supernova 2005ek
• SN Ib 1990I: Clumping and Dust in the Ejecta?
• Multi-Wavelength Observations of Supernova 2011ei: Time-Dependent Classification of Type IIb and Ib Supernovae and Implications for their Progenitors
• The Berkeley Sample of Stripped-Envelope Supernovae
• Supernova radiative-transfer modeling: A new approach using non-LTE and full time dependence
• The Double-Peaked SN2013ge: a Type Ib/c SN with an Asymmetric Mass Ejection or an Extended Progenitor Envelope
• The properties of SN Ib/c locations
• The progenitor and early evolution of the Type IIb SN 2016gkg
• SN2011hs: a Fast and Faint Type IIb Supernova from a Supergiant Progenitor
• SN 2017ein and the Possible First Identification of a Type Ic Supernova Progenitor
• Nebular-phase spectra of superluminous supernovae: physical insights from observational and statistical properties
• A physically motivated classification of stripped-envelope supernovae
• Supernova 2010as: the Lowest-Velocity Member of a Family of Flat-Velocity Type IIb Supernovae
• iPTF15dtg: a double-peaked Type Ic Supernova from a massive progenitor
• The broad line type Ic supernova SN 2007ru: Adding to the diversity of type Ic supernovae
• SN 2016coi/ASASSN-16fp: An example of residual helium in a type Ic supernova?
• SN 2010ay is a Luminous and Broad-lined Type Ic Supernova within a Low-metallicity Host Galaxy
• Oxygen and helium in stripped-envelope supernovae
• A Luminous and Fast-Expanding Type Ib Supernova SN 2012au
• The ANU WiFeS SuperNovA Program (AWSNAP)
• Broad-line type Ic Supernova SN 2014ad
• The Continuing Story of SN IIb 2013df: New Optical and IR Observations and Analysis
• A metric space for type Ia supernova spectra
• Hypertemporal Imaging of NYC Grid Dynamics

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