SN 2021adxl: A luminous nearby interacting supernova in an extremely low metallicity environment

Abstract

SN 2021adxl is a slowly evolving, luminous, Type IIn supernova with asymmetric emission line profiles, similar to the well-studied SN 2010jl. We present extensive optical, near-ultraviolet, and near-infrared photometry and spectroscopy covering ~1.5 years post discovery. SN 2021adxl occurred in an unusual environment, atop a vigorously star-forming region that is offset from its host galaxy core. The appearance of Ly-alpha, O II, as well as the compact core, would classify the host of SN 2021adxl as a Blueberry galaxy, analogous to the higher redshift Green Pea galaxies. Using several abundance indicators, we find a metallicity of the explosion environment of only 10% solar, the lowest reported metallicity for a Type IIn SN environment. SN 2021adxl reaches a peak magnitude of r ~ -20.2 mag and since discovery, SN 2021adxl has faded by only ~4 magnitudes in the r band with a cumulative radiated energy of ~1.5e50 erg over 18 months. SN 2021adxl shows strong signs of interaction with a complex circumstellar medium, seen by the detection of X-rays, revealed by the detection of coronal emission lines, and through multi-component hydrogen and helium profiles. In order to further understand this interaction, we model the Hα profile using a Monte-Carlo electron scattering code. The blueshifted high-velocity component is consistent with emission from a radially thin, spherical shell resulting in the broad emission components due to electron scattering. Using the velocity evolution of this emitting shell, we find that the SN ejecta collide with circumstellar material of at least 5 Msun, assuming a steady-state mass-loss rate of 4-6e-3 Msun per year for the first ~200 days of evolution. Continuing the observations of SN 2021adxl may reveal signatures of dust formation or an infrared excess, similar to that seen for SN 2010jl.

arXiv comment21 pages with 27 Figures. Accepted for publication to A&A. MC line scattering code can be found at https://github.com/Astro-Sean/escatter

References in corpus (133)

• Galactic Stellar and Substellar Initial Mass Function
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Swift X-ray Telescope
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• How Massive Single Stars End their Life
• Binary interaction dominates the evolution of massive stars
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• Overview of the DESI Legacy Imaging Surveys
• [O III]/[N II] as an Abundance Indicator at High Redshift
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Cosmic-Ray Rejection by Laplacian Edge Detection
• The reversal of the star formation-density relation in the distant universe
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• Progenitors of core-collapse supernovae
• ATLAS: A High-Cadence All-Sky Survey System
• Explosion Mechanisms of Core-Collapse Supernovae
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• Physical Properties of Wolf-Rayet Stars
• Pre-Supernova Evolution of Massive Single and Binary Stars
• An online repository of Swift/XRT light curves of GRBs
• The Zwicky Transient Facility: Science Objectives
• WISeREP - An Interactive Supernova Data Repository
• Pulsational Pair-Instability Supernovae
• The chemical make-up of the Sun: A 2020 vision
• Stellar Population Inference with Prospector
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• Luminous Supernovae
• Galaxy Zoo Green Peas: Discovery of A Class of Compact Extremely Star-Forming Galaxies
• Understanding Galaxy Evolution through Emission Lines
• Nebular Continuum and Line Emission in Stellar Population Synthesis Models
• The Zwicky Transient Facility: Surveys and Scheduler
• Design and operation of the ATLAS Transient Science Server
• unWISE: unblurred coadds of the WISE imaging
• Generalized Semi-Analytical Models of Supernova Light Curves
• The Zwicky Transient Facility: Observing System
• On the progenitor of SN 2005gl and the nature of Type IIn supernovae
• Chemical abundances in high-redshift galaxies: A powerful new emission line diagnostic
• High Density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The first 1100 days
• A new approach to analyzing solar coronal spectra and updated collisional ionization equilibrium calculations. II. Additional ionization rate coefficients
• The SED Machine: a robotic spectrograph for fast transient classification
• Precursors prior to Type IIn supernova explosions are common: precursor rates, properties, and correlations
• Fully-Automated Reduction of Longslit Spectroscopy with the Low Resolution Imaging Spectrometer at Keck Observatory
• The Most Luminous Supernovae
• Common Envelope Evolution Leading to Supernovae with Dense Interaction
• Pre-Supernova Outbursts via Wave Heating in Massive Stars I: Red Supergiants
• Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies
• The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope
• Host-Galaxy Properties of 32 Low-Redshift Superluminous Supernovae from the Palomar Transient Factory
• 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
• Red supergiants as potential Type IIn supernova progenitors: Spatially resolved 4.6 micron CO emission around VY CMa and Betelgeuse
• Carnegie Supernova Project: Observations of Type IIn supernovae
• Coronal lines and dust formation in SN 2005ip: Not the brightest, but the hottest Type IIn supernova
• Core-Collapse Supernovae and Host Galaxy Stellar Populations
• Multi-wavelength Observations of the Enduring Type IIn Supernovae 2005ip and 2006jd
• Cosmic evolution and metal aversion in super-luminous supernova host galaxies
• Interacting Supernovae: Types IIn and Ibn
• Galaxy And Mass Assembly (GAMA): Accurate Panchromatic Photometry from Optical Priors using LAMBDAR
• Luminous Blue Variables and superluminous supernovae from binary mergers
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• Optical and Ultraviolet Spectroscopy of SN 1995N: Evidence for Strong Circumstellar Interaction
• Superluminous supernovae
• A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm
• Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star
• A Massive Progenitor of the Luminous Type IIn Supernova 2010jl
• SN 2009ip á la PESSTO: No evidence for core-collapse yet
• Detection of Broad H$\alpha$ Emission Lines in the Late-time Spectra of a Hydrogen-poor Superluminous Supernova
• The Palomar Transient Factory Core-Collapse Supernova Host-Galaxy Sample. I. Host-Galaxy Distribution Functions and Environment-Dependence of CCSNe
• New predictions for radiation-driven, steady-state mass-loss and wind-momentum from hot, massive stars II. A grid of O-type stars in the Galaxy and the Magellanic Clouds
• Numerical simulations of super-luminous supernovae of type IIn
• Type IIn Supernova SN 2010jl: Optical Observations for Over 500 Days After Explosion
• Massive star evolution: Luminous Blue Variables as unexpected Supernova progenitors
• SN 2005 gj: Evidence for LBV supernovae progenitors?
• SN 2010jl in UGC 5189: Yet another luminous type IIn supernova in a metal-poor galaxy
• Mass-loss histories of Type IIn supernova progenitors within decades before their explosion
• Green Pea Galaxies Reveal Secrets of Ly$\alpha$ Escape
• Supernova Interaction with a Circumstellar Medium
• X-ray and radio emission from Type IIn supernova SN 2010jl
• The X-shooter GRB afterglow legacy sample (XS-GRB)
• Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
• A data science platform to enable time-domain astronomy
• Type IIn supernova light-curve properties measured from an untargeted survey sample
• NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
• Massive stars exploding in a He-rich circumstellar medium. IV. Transitional Type Ibn Supernovae
• A Close Relationship between Lyman Alpha and Mg II in Green Pea Galaxies
• The diverse lives of progenitors of hydrogen-rich core-collapse supernovae: the role of binary interaction
• SN 2009kn - the twin of the Type IIn supernova 1994W
• Spectra of supernovae in the nebular phase
• Puzzling Lyman-alpha line profiles in green pea galaxies
• Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results
• The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
• Explosions Triggered by Violent Binary-Star Collisions: Application to Eta Carinae and other Eruptive Transients
• Photometry of SN 2002ic and Implications for the Progenitor Mass-Loss History
• Environments of interacting transients: Impostors and type IIn supernovae
• A Model for the 19th Century Eruption of Eta Carinae: CSM Interaction Like a Scaled-Down Type IIn Supernova
• Supernova 1998S at 14 years Postmortem: Continuing Circumstellar Interaction and Dust Formation
• The Unusual Temporal and Spectral Evolution of the Type IIn Supernova 2011ht
• On Luminous Blue Variables as the Progenitors of Core-Collapse Supernovae, especially Type IIn Supernovae
• Type II supernovae as probes of environment metallicity: observations of host HII regions
• SN 2017ens: The Metamorphosis of a Luminous Broad-lined Type Ic Supernova into an SN IIn
• An extremely energetic supernova from a very massive star in a dense medium
• New Modules for the SEDMachine to Remove Contaminations from Cosmic Rays and Non-target Light: BYECR and CONTSEP
• Late-Time Spectral Observations of the Strongly Interacting Type Ia Supernova PTF11kx
• Models for the Unusual Supernova iPTF14hls
• Electron scattering wings on lines in interacting supernovae
• Optical observations of the luminous Type IIn Supernova 2010jl for over 900 days
• Local Tadpole Galaxies
• A Type Ia supernova at the heart of superluminous transient SN 2006gy
• Optical and IR observations of SN 2013L, a Type IIn Supernova surrounded by asymmetric CSM
• Supernova ejecta interacting with a circumstellar disk. I. two-dimensional radiation-hydrodynamic simulations
• The Carnegie Supernova Project II. The shock wave revealed through the fog: The strongly interacting Type IIn SN 2013L
• SN 2018bsz: a Type I superluminous supernova with aspherical circumstellar material
• Evidence of Asymmetry in SN 2007rt, a Type IIn Supernova
• DBSP_DRP: A Python package for automated spectroscopic data reduction of DBSP data
• Photometric and spectroscopic evolution of the interacting transient AT 2016jbu (Gaia16cfr)
• The Slow Demise of the Long-Lived SN 2005ip
• A systematic reclassification of type IIn supernovae
• The Great Eruption of Eta Carinae
• P Cygni: An Extraordinary Luminous Blue Variable
• Strong [OIII]λ5007 emission line compact galaxies in LAMOST DR9: Blueberries, Green Peas and Purple Grapes
• 2D radiaition-hydrodynamic simulations of supernova shock breakout in bipolar explosions of a blue supergiant progenitor
• Coronal emission from the shocked circumstellar ring of SN 1987A
• An H-alpha survey of the host environments of 77 type IIn supernovae within z<0.02
• 3D Hydrodynamics of Pre-supernova Outbursts in Convective Red Supergiant Envelopes
• Modeling of interactions between supernovae ejecta and aspherical circumstellar environments
• The infrared echo of SN2010jl and its implications for shock breakout characteristics
• The Carnegie Supernova Project II. Observations of SN 2014ab possibly revealing a 2010jl-like SN IIn with pre-existing dust
• Wind of presupernova IIn SN~1997eg
• Star formation and gas in the minor merger UGC 10214

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• Sample of hydrogen-rich superluminous supernovae from the Zwicky Transient Facility
• On the diversity of strongly-interacting Type IIn supernovae
• Observational diversity of bright long-lived Type II supernovae
• The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction (II): Estimating the CSM mass and geometry with polarimetry and light curve modeling
• Gamma-ray signature of superluminous supernovae: Fermi-LAT GeV detection of SN 2017egm and evidence of a central engine
• Eruptive mass loss less than a year before the explosion of superluminous supernovae. II. A systematic search for pre-explosion eruptions with VLT/X-shooter
• A study on late time UV-emission in core collapse supernovae and the implications for the peculiar transient AT2018cow