Results from the Pan-STARRS Search for Kilonovae: Contamination by Massive Stellar Outbursts

Abstract

We present results from the Pan-STARRS optical search for kilonovae without the aid of gravitational wave and gamma-ray burst triggers. The search was conducted from 26 October 2019 to 15 December 2022. During this time, we reported 29,740 transients observed by Pan-STARRS to the IAU Transient Name Server. Of these, 175 were Pan-STARRS credited discoveries that had a host galaxy within 200 Mpc and had discovery absolute magnitudes M > -16.5. A subset of 11 transients was plausibly identified as kilonova candidates by our kilonova prediction algorithm. Through a combination of historical forced photometry, extensive follow-up, and aggregating observations from multiple sky surveys, we eliminated all as kilonova candidates. Rapidly evolving outbursts from massive stars (likely to be Luminous Blue Variable eruptions) accounted for 55% of the subset's contaminating sources. We estimate the rate of such eruptions using the ATLAS 100 Mpc volume-limited survey data. As these outbursts appear to be significant contaminants in kilonova searches, we estimate contaminating numbers when searching gravitational wave skymaps produced by the LIGO-Virgo-Kagra science collaboration during the Rubin era. The Legacy Survey of Space and time, reaching limiting magnitudes of m = 25, could detect 2-6 massive stellar outbursts per 500 deg^2 within a 4-day observing window, within the skymaps and volumes typical for binary neutron star mergers projected for Ligo-Virgo-Kagra Observing run 5. We conclude that while they may be a contaminant, they can be photometrically identified.

arXiv commentSubmitted to MNRAS Journal on 24th May 2025. The supplementary photometry file is proprietary until the Journal's acceptance. 19 pages, 15 figures, 2 tables

References in corpus (107)

• Planck 2015 results. XIII. Cosmological parameters
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The SIMBAD astronomical database
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• Transient Events from Neutron Star Mergers
• SINGS: The SIRTF Nearby Galaxies Survey
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• ATLAS: A High-Cadence All-Sky Survey System
• Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
• Electromagnetic Counterparts of Compact Object Mergers Powered by the Radioactive Decay of R-process Nuclei
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• The Pan-STARRS1 Photometric System
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• The X-ray counterpart to the gravitational wave event GW 170817
• A kilonova as the electromagnetic counterpart to a gravitational-wave source
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• Observation of gravitational waves from two neutron star-black hole coalescences
• Cosmicflows-2: The Data
• The Pan-STARRS1 Database and Data Products
• Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. I. Dark Energy Camera Discovery of the Optical Counterpart
• Swift and NuSTAR observations of GW170817: detection of a blue kilonova
• Opacities and Spectra of the r-process Ejecta from Neutron Star Mergers
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. III. Optical and UV Spectra of a Blue Kilonova From Fast Polar Ejecta
• Radiative Transfer Simulations for Neutron Star Merger Ejecta
• The discovery of the electromagnetic counterpart of GW170817: kilonova AT 2017gfo/DLT17ck
• A Catalog of Detailed Visual Morphological Classifications for 14034 Galaxies in the Sloan Digital Sky Survey
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• Design and operation of the ATLAS Transient Science Server
• A Kilonova Following a Long-Duration Gamma-Ray Burst at 350 Mpc
• The progenitors of compact-object binaries: impact of metallicity, common envelope and natal kicks
• Early Spectra of the Gravitational Wave Source GW170817: Evolution of a Neutron Star Merger
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• The Unprecedented 2012 Outburst of SN 2009ip: A Luminous Blue Variable Becomes a True Supernova
• The Zwicky Transient Facility Bright Transient Survey. II. A Public Statistical Sample for Exploring Supernova Demographics
• Interacting Supernovae and Supernova Impostors. SN 2009ip, is this the end?
• An embedded X-ray source shines through the aspherical AT2018cow: revealing the inner workings of the most luminous fast-evolving optical transients
• MASTER optical detection of the first LIGO/Virgo neutron stars merging GW170817
• The Cow: discovery of a luminous, hot and rapidly evolving transient
• Discovery of Precursor LBV Outbursts in Two Recent Optical Transients: The Fitfully Variable Missing Links UGC 2773-OT and SN 2009ip
• The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?
• JWST detection of heavy neutron capture elements in a compact object merger
• MOSFiT: Modular Open-Source Fitter for Transients
• An outburst from a massive star 40 days before a supernova explosion
• Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
• Strong Ultraviolet Pulse From a Newborn Type Ia Supernova
• POSSIS: predicting spectra, light curves and polarization for multi-dimensional models of supernovae and kilonovae
• The Diversity of Massive Star Outbursts I: Observations of SN 2009ip, UGC 2773 OT2009-1, and Their Progenitors
• The Pan-STARRS Data Processing System
• Detectability of compact binary merger macronovae
• SN 2009ip and SN 2010mc: Core-collapse Type IIn supernovae arising from blue supergiants
• Rapidly Decaying Supernova 2010X: A Candidate ".Ia" Explosion
• The Rapid Reddening and Featureless Optical Spectra of the optical counterpart of GW170817, AT 2017gfo, During the First Four Days
• RAPID: Early Classification of Explosive Transients using Deep Learning
• GROWTH on S190425z: Searching thousands of square degrees to identify an optical or infrared counterpart to a binary neutron star merger with the Zwicky Transient Facility and Palomar Gattini IR
• The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at $z=0.27$
• A mildly relativistic outflow from the energetic, fast-rising blue optical transient CSS161010 in a dwarf galaxy
• Evidence for Cocoon Emission from the Early Light Curve of SSS17a
• How was the Hubble sequence 6 Gyrs ago?
• Modeling Kilonova Light Curves: Dependence on Nuclear Inputs
• Machine Learning-based Brokers for Real-time Classification of the LSST Alert Stream
• Tight multi-messenger constraints on the neutron star equation of state from GW170817 and a forward model for kilonova light curve synthesis
• Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically-discovered Gamma-ray Burst Afterglows and New Constraints on the Kilonova Rate
• Natal Kicks and Time Delays in Merging Neutron Star Binaries - Implications for r-process nucleosynthesis in Ultra Faint Dwarfs and in the Milky Way
• Clues To The Nature of SN 2009ip from Photometric and Spectroscopic Evolution to Late Times
• Machine learning for transient discovery in Pan-STARRS1 difference imaging
• Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational wave source GW150914
• First Results from Pan-STARRS1: Faint, High Proper Motion White Dwarfs in the Medium-Deep Fields
• Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star
• SN2019dge: a Helium-rich Ultra-Stripped Envelope Supernova
• Luminous Millimeter, Radio, and X-ray Emission from ZTF20acigmel (AT2020xnd)
• Supernova Impostors and other Gap Transients
• Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory
• A Deep CFHT Optical Search for a Counterpart to the Possible Neutron Star -- Black Hole Merger GW190814
• 3D radiative transfer kilonova modelling for binary neutron star merger simulations
• The Spectroscopic Classification of Astronomical Transients (SCAT) Survey: Overview, Pipeline Description, Initial Results, and Future Plans
• The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814
• SN2018kzr: a rapidly declining transient from the destruction of a white dwarf
• A Late-Time Galaxy-Targeted Search for the Radio Counterpart of GW190814
• A Bright Ultraviolet Excess in the Transitional 02es-like Type Ia Supernova 2019yvq
• The Persistent Eruption of UGC~2773-OT: Finally, a Decade-Long Extragalactic Eta Carinae Analog
• Exploring compact binary merger host galaxies and environments with $\mathrm{zELDA}$
• Volumetric rates of Luminous Red Novae and Intermediate Luminosity Red Transients with the Zwicky Transient Facility
• AT2018kzr: the merger of an oxygen-neon white dwarf and a neutron star or black hole
• SN 2020kyg and the rates of faint Iax Supernovae from ATLAS
• Constraints on the electromagnetic counterpart of the Neutron Star Black Hole merger GW200115
• The Most Rapidly Declining Type I Supernova 2019bkc/ATLAS19dqr
• The rise and fall of an extraordinary Ca-rich transient -- The discovery of ATLAS19dqr/SN 2019bkc
• A search for radio emission from double-neutron star merger GW190425 using Apertif
• PS15cey and PS17cke: prospective candidates from the Pan-STARRS Search for Kilonovae
• Enabling the discovery of fast transients: A kilonova science module for the Fink broker
• Panning for gold, but finding helium: discovery of the ultra-stripped supernova SN2019wxt from gravitational-wave follow-up observations
• Where binary neutron stars merge: predictions from IllustrisTNG
• Rubin ToO 2024: Envisioning the Vera C. Rubin Observatory LSST Target of Opportunity program

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