Luminous, rapidly declining supernovae as stripped transitional objects in low metallicity environments: the case of SN 2022lxg

Abstract

We present an analysis of the optical and near-infrared properties of SN 2022lxg, a bright (${\mathrm{M}}_{\mathrm{g}\mathrm{peak}}=-19.41$ mag) and rapidly evolving SN. It was discovered within a day of explosion, and rose to peak brightness in 10 d. Two distinct phases of circumstellar interaction are evident in the data. The first is marked by a steep blue continuum (T $>15,000$ K) with flash-ionisation features due to hydrogen and He II. The second, weaker phase is marked by a change in the colour evolution accompanied by changes in the shapes and velocities of the spectral line profiles. Narrow P-Cygni profiles (~ $150$ km s${}^{-1}$) of He I further indicate the presence of slow-moving unshocked material and suggesting partial stripping of the progenitor. The fast decline of the light curve from peak (3.48$\pm$ 0.26 mag $(50\mathrm{d}{)}^{-1}$ in $g$-band) implies that the ejecta mass must be low. Spectroscopically, until $+35$ d there are similarities to some Type IIb SNe but then there is a transition to spectra that are more reminiscent of an interacting SN II. However, metal lines are largely absent in the spectra, even at epochs of 80 d. Its remote location from the presumed host galaxy, a dwarf with ${\mathrm{M}}_{\mathrm{B}}$ ~ $-14.4$ mag, is consistent with our metallicity estimate - close to the SMC value - obtained from scaling relations. Furthermore, several lines of evidence (including intrinsic polarisation of $p$ ~ (0.5-1.0) %) point to deviations from spherical symmetry. We suggest that a plausible way of uniting the observational clues is to consider a binary system that underwent case C mass transfer. This failed to remove the entire H-envelope of the progenitor before it underwent core-collapse. In this scenario, the progenitor itself would be more compact and perhaps straddle the boundary between blue and yellow supergiants, tying in with the early spectroscopic similarity to Type IIb SNe.

Accepted for publication in Astronomy and Astrophysics (in production; official acceptance date: 12/06/2025)

References in corpus (112)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• [O III]/[N II] as an Abundance Indicator at High Redshift
• The u'g'r'i'z' Standard Star Network
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• ATLAS: A High-Cadence All-Sky Survey System
• The 'Forbidden' Abundance of Oxygen in the Sun
• Pre-Supernova Evolution of Massive Single and Binary Stars
• Rotating Massive Main-Sequence Stars I: Grids of Evolutionary Models and Isochrones
• The Zwicky Transient Facility: Science Objectives
• WISeREP - An Interactive Supernova Data Repository
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
• Determining the Type, Redshift, and Age of a Supernova Spectrum
• Observed and Physical Properties of Core-Collapse Supernovae
• The metamorphosis of SN1998bw
• Shock Breakout in Dense Mass Loss: Luminous Supernovae
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• Grids of stellar models with rotation - III. Models from 0.8 to 120 Msun at a metallicity Z = 0.002
• 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
• SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
• The Zwicky Transient Facility: Observing System
• Analytical Light Curve Models of Super-Luminous Supernovae: chi^2-Minimizations of Parameter Fits
• Flash Spectroscopy: Emission Lines from the Ionized Circumstellar Material around $<10$-Day-Old Type II Supernovae
• The Type IIb Supernova 2011dh from a Supergiant Progenitor
• The SED Machine: a robotic spectrograph for fast transient classification
• The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?
• PTF11eon/SN2011dh: Discovery of a Type IIb Supernova From a Compact Progenitor in the Nearby Galaxy M51
• MOSFiT: Modular Open-Source Fitter for Transients
• Broad emission lines from opaque electron-scattering environment of SN 1998S
• Core-Collapse Supernovae from the Palomar Transient Factory: Indications for a Different Population in Dwarf Galaxies
• Coronal lines and dust formation in SN 2005ip: Not the brightest, but the hottest Type IIn supernova
• PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806
• Multi-wavelength Observations of the Enduring Type IIn Supernovae 2005ip and 2006jd
• Type Ib and IIb supernova progenitors in interacting binary systems
• PTF11iqb: Cool supergiant mass loss that bridges the gap between Type IIn and normal supernovae
• A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
• The Exceptionally Luminous Type II-L SN 2008es
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• A Sample of Type II-L Supernovae
• Progenitor Diagnostics for Stripped Core-Collapse Supernovae: Measured Metallicities at Explosion Sites
• A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm
• ESC Supernova spectroscopy of non-ESC targets
• Binary progenitor models of type IIb supernovae
• Discovery of the Ultra-Bright Type II-L Supernova 2008es
• Explosion of red-supergiant stars: influence of the atmospheric structure on shock breakout and the early-time supernova radiation
• A novel estimator of the polarization amplitude from normally distributed Stokes parameters
• Constraining mixing in massive stars in the Small Magellanic Cloud
• Discovery of an Unusual Optical Transient with the Hubble Space Telescope
• SN 2005 gj: Evidence for LBV supernovae progenitors?
• Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
• PISCO: The Pmas/ppak Integral-field Supernova hosts COmpilation
• Hubble Space Telescope and Ground-Based Observations of SN 1993J and SN 1998S: CNO Processing in the Progenitors
• The Type IIb SN 2011dh - Two years of observations and modelling of the lightcurves
• A Search for Extragalactic Fast Blue Optical Transients in ZTF and the Rate of AT2018cow-like Transients
• Early Emission from the Type IIn Supernova 1998S at High Resolution
• A Blast Wave from the 1843 Eruption of Eta Carinae
• The prevalence and influence of circumstellar material around hydrogen-rich supernova progenitors
• H-alpha Spectral diversity of type II supernovae
• Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
• The Type Icn SN 2021csp: Implications for the Origins of the Fastest Supernovae and the Fates of Wolf-Rayet Stars
• Analysis of blue-shifted emission peaks in type II supernovae
• SN 2013df, a double-peaked IIb supernova from a compact progenitor and an extended H envelope
• A comparative study of Type II-P and II-L supernova rise times as exemplified by the case of LSQ13cuw
• Modeling the signatures of interaction in Type II supernovae: UV emission, high-velocity features, broad-boxy profiles
• On the nature of the circumstellar medium of the remarkable type Ia/IIn supernova, SN 2002ic
• Asphericity, Interaction, and Dust in the Type II-P/II-L Supernova 2013ej in Messier 74
• Multi-Wavelength Properties of the Type IIb SN 2008ax
• The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
• SN2011hs: a Fast and Faint Type IIb Supernova from a Supergiant Progenitor
• SN 2013dx associated with GRB 130702A: a detailed photometric and spectroscopic monitoring and a study of the environment
• The Transitional Stripped-Envelope SN 2008ax: Spectral Evolution and Evidence for Large Asphericity
• Diversity of Luminous Supernovae from Non-Steady Mass Loss
• New Modules for the SEDMachine to Remove Contaminations from Cosmic Rays and Non-target Light: BYECR and CONTSEP
• A fully automated data reduction pipeline for the FRODOSpec integral field spectrograph
• Circumstellar interaction in type Ibn supernovae and SN 2006jc
• The broad line type Ic supernova SN 2007ru: Adding to the diversity of type Ic supernovae
• SN 2011fu: A type IIb Supernova with a luminous double-peaked light curve
• Observed Type II supernova colours from the Carnegie Supernova Project-I
• Photometric segregation of dwarf and giant FGK stars using the SVO Filter Profile Service and photometric tools
• Time-resolved polarimetry of the superluminous SN 2015bn with the Nordic Optical Telescope
• The spectacular evolution of Supernova 1996al over 15 years: a low energy explosion of a stripped massive star in a highly structured environment
• Type II supernovae in low luminosity host galaxies
• SN 2018bsz: a Type I superluminous supernova with aspherical circumstellar material
• Using spectral modeling to break light-curve degeneracies of type II supernovae interacting with circumstellar material
• Carnegie Supernova Project-II: Near-infrared Spectroscopic Diversity of Type II Supernovae
• 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
• DBSP_DRP: A Python package for automated spectroscopic data reduction of DBSP data
• Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
• Average opacity calculation for core-collapse supernovae
• SN 2017ivv: two years of evolution of a transitional Type II supernova
• Metallicity from Type II Supernovae from the (i)PTF
• Polarimetry of Hydrogen-Poor Superluminous Supernovae
• Broad-emission-line dominated hydrogen-rich luminous supernovae
• LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation
• A Multi-Wavelength View on the Rapidly-Evolving Supernova 2018ivc: An Analog of SN IIb 1993J but Powered Primarily by Circumstellar Interaction
• Yellow Supergiants and Post-Red Supergiant Evolution in the Large Magellanic Cloud
• A characterization of ASAS-SN core-collapse supernova environments with VLT+MUSE: I. Sample selection, analysis of local environments, and correlations with light curve properties
• SN 2016gsd: An unusually luminous and linear type II supernova with high velocities
• Multiwavelength Observations of NaSt1 (WR 122): Equatorial Mass Loss and X-rays from an Interacting Wolf-Rayet Binary
• Resurrection of type IIL supernova 2018ivc: Implications for a binary evolution sequence connecting hydrogen-rich and -poor progenitors
• Asymmetries and Circumstellar Interaction in the Type II SN 2024bch
• Supernovae without host galaxies? The low surface brightness host of SN 2009Z
• Are stripped envelope supernovae really deficient in ${}^{56}$Ni?
• Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc
• The fast rise of the unusual Type IIL/IIb SN 2018ivc

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