The Extremely Metal-Poor SN 2023ufx: A Local Analog to High-Redshift Type II Supernovae

Abstract

We present extensive observations of the Type II supernova (SN II) 2023ufx which is likely the most metal-poor SN II observed to-date. It exploded in the outskirts of a low-metallicity ($Z_{\mathrm{host}}\sim 0.1Z_{\odot }$) dwarf ($M_g=-13.23\pm 0.15$~mag; $r_e\sim 1$~kpc) galaxy. The explosion is luminous, peaking at $M_g\approx -18.5$mag, and shows rapid evolution. The $r$-band (pseudo-bolometric) light curve has a shock-cooling phase lasting 20 (17) days followed by a 19 (23)-day plateau. The entire optically-thick phase lasts only $\approx 55$days following explosion, indicating that the red supergiant progenitor had a thinned H envelope prior to explosion. The early spectra obtained during the shock-cooling phase show no evidence for narrow emission features and limit the pre-explosion mass-loss rate to $\dot{M}\lesssim 10^{-3}{\mathrm{M}}_{\odot }$/yr. The photospheric-phase spectra are devoid of prominent metal absorption features, indicating a progenitor metallicity of $\lesssim 0.1Z_{\odot }$. The semi-nebular ($\sim 60-130$d) spectra reveal weak Fe II, but other metal species typically observed at these phases (Ti II, Sc II, Ba II) are conspicuously absent. The late-phase optical and near-infrared spectra also reveal broad ($\approx 10^4\mathrm{km}{\mathrm{s}}^{-1}$) double-peaked H$\alpha$, P$\beta$, and P$\gamma$ emission profiles suggestive of a fast outflow launched during the explosion. Outflows are typically attributed to rapidly-rotating progenitors which also prefer metal-poor environments. This is only the second SN II with $\lesssim 0.1Z_{\odot }$ and both exhibit peculiar evolution, suggesting a sizable fraction of metal-poor SNe II have distinct properties compared to nearby metal-enriched SNe II. These observations lay the groundwork for modeling the metal-poor SNe II expected in the early Universe.

17 pages, 15 figures and 3 tables in main text, an additional 5 pages, 4 figures, and 2 tables in the appendix. Accepted by ApJ, spectra and photometry are included as ancillary data

References in corpus (75)

• The NumPy array: a structure for efficient numerical computation
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Binary interaction dominates the evolution of massive stars
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Supernova -- Gamma-Ray Burst Connection
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• Pre-Supernova Evolution of Massive Single and Binary Stars
• Long gamma-ray bursts and core-collapse supernovae have different environments
• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• The chemical make-up of the Sun: A 2020 vision
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
• The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z~8
• Three-Dimensional Simulations of Core-Collapse Supernovae: From Shock Revival to Shock Breakout
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• Asphericity in Supernova Explosions from Late-Time Spectroscopy
• The Wide Field Spectrograph (WiFeS): Performance and Data Reduction
• The Role of Turbulence in Neutrino-Driven Core-Collapse Supernova Explosions
• Towards Characterization of the Type IIP Supernova Progenitor Population: a Statistical Sample of Light Curves from Pan-STARRS1
• Photometric and Spectroscopic Properties of Type II-P Supernovae
• Late-time spectral line formation in Type IIb supernovae, with application to SN 1993J, SN 2008ax, and SN 2011dh
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• Signatures of a jet cocoon in early spectra of a supernova associated with a $\gamma$-ray burst
• Progenitor Diagnostics for Stripped Core-Collapse Supernovae: Measured Metallicities at Explosion Sites
• Final Moments I: Precursor Emission, Envelope Inflation, and Enhanced Mass loss Preceding the Luminous Type II Supernova 2020tlf
• Theory and Diagnostics of Hot Star Mass Loss
• On The Intrinsic Diversity of Type II-Plateau Supernovae
• Searching for Extremely Blue UV Continuum Slopes at $z=7-11$ in JWST/NIRCam Imaging: Implications for Stellar Metallicity and Ionizing Photon Escape in Early Galaxies
• Inferring Explosion Properties from Type II-Plateau Supernova Light Curves
• The prevalence and influence of circumstellar material around hydrogen-rich supernova progenitors
• The Type IIP Supernova 2012aw in M95: hydrodynamical modelling of the photospheric phase from accurate spectrophotometric monitoring
• VLT detection of a red supergiant progenitor of the type IIP supernova 2008bk
• The metallicity dependence of envelope inflation in massive stars
• Modeling the signatures of interaction in Type II supernovae: UV emission, high-velocity features, broad-boxy profiles
• Driving classical Wolf-Rayet winds: A Γ- and Z-dependent mass-loss
• Type II supernovae from the Carnegie Supernova Project-I. II. Physical parameter distributions from hydrodynamical modelling
• Type II supernova spectral diversity II: Spectroscopic and photometric correlations
• Type II-Plateau supernovae as metallicity probes of the Universe
• The Tarantula Massive Binary Monitoring VI: Characterisation of hidden companions in 51 single-lined O-type binaries, a flat mass-ratio distribution, and black-hole binary candidates
• Analytic, dust-independent mass-loss rates for red supergiant winds initiated by turbulent pressure
• SN 2012ec: mass of the progenitor from PESSTO follow-up of the photospheric phase
• The gas and stellar content of a metal-poor galaxy at $z=8.496$ as revealed by JWST and ALMA
• Supernova Progenitors, Their Variability, and the Type IIP Supernova ASASSN-16fq in M66
• How much hydrogen is in Type Ib and IIb supernova progenitors?
• The Spectroscopic Classification of Astronomical Transients (SCAT) Survey: Overview, Pipeline Description, Initial Results, and Future Plans
• Magnetic braking of stellar cores in red giants and supergiants
• Type II supernovae from the Carnegie Supernova Project-I. III. Understanding SN II diversity through correlations between physical and observed properties
• Type II supernovae from the Carnegie Supernova Project-I. I. Bolometric light curves of 74 SNe II using uBgVriYJH photometry
• The ANU WiFeS SuperNovA Program (AWSNAP)
• A sequence of Type Ib, IIb, II-L, and II-P supernovae from binary-star progenitors of varying initial separation
• Carnegie Supernova Project-II: Near-infrared Spectroscopic Diversity of Type II Supernovae
• A Study of Primordial Very Massive Star Evolution
• Luminosity distribution of Type II supernova progenitors
• The Red Supergiant Binary Fraction as a Function of Metallicity in M31 and M33
• Connecting the Light Curves of Type IIP Supernovae to the Properties of their Progenitors
• Early results from GLASS-JWST. VI: Extreme rest-optical equivalent widths detected in NIRISS Wide Field Slitless Spectroscopy
• The disappearances of six supernova progenitors
• The effects of surface fossil magnetic fields on massive star evolution: IV. Grids of models at Solar, LMC, and SMC metallicities
• SN 2017ivv: two years of evolution of a transitional Type II supernova
• Broad-emission-line dominated hydrogen-rich luminous supernovae
• Supernovae Producing Unbound Binaries and Triples
• Multiple Peaks and a Long Precursor in the Type IIn Supernova 2021qqp: An Energetic Explosion in a Complex Circumstellar Environment
• The Late Time Optical Evolution of Twelve Core-Collapse Supernovae: Detection of Normal Stellar Winds
• The Galactic Underworld: The spatial distribution of compact remnants
• Binary Fraction Indicators in Resolved Stellar Populations and Supernova Type Ratios
• A metallicity dependence on the occurrence of core-collapse supernovae
• Critical Metallicity of Cool Supergiant Formation. I. Effects on Stellar Mass Loss and Feedback
• Galaxy flows within 8,000 km/s from Numerical Action methods
• Metallicity Estimation of Core-Collapse Supernova HII Regions in Galaxies within 30 Mpc
• Evolution of Rotating 25 M${}_{\odot }$ Population III star: Physical Properties and Resulting Supernovae
• A Search for Unbound Stellar Companions to Pulsar J1124-5916
• Bright Type IIP Supernovae in Low-Metallicity Galaxies
• Parameters of the type-IIP supernova SN 2012aw
• WiFeS observations of nearby southern Type Ia supernova host galaxies

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