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IIb or not IIb: A Catalog of ZTF Kilonova Imposters

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arxiv 2506.15900 v2 pith:H5MAWWWK submitted 2025-06-18 astro-ph.HE

Tyler Barna , Christoffer Fremling , Tomas Ahumada , Igor Andreoni , Smaranika Banerjee , Joshua S. Bloom , Mattia Bulla , Tracy X. Chen
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Michael W. Coughlin Tim Dietrich Xander J. Hall Alexandra Junell Ben Rusholme Jesper Sollerman Niharika Sravan
This is my paper · ORCID
classification astro-ph.HE
keywords transientsfotsnumberobjectsscarcityspectroscopyvariousable
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Among the various classes of fast optical transients (FOTs), kilonovae (KNe), which can emerge as a result of neutron star mergers, are extremely challenging to observe because of not only the rapid timescale on which they fade (on the order of days), but also due to the relative scarcity of their occurrence. This scarcity is compounded by the large number of other FOTs that may initially resemble the characteristic rise of a KNe. While these objects can be ruled out as candidate KNe by taking spectroscopy, a method of confidently ruling out transients based on photometric analysis alone would be incredibly valuable. We describe the compilation of various "imposter" transients, including a plurality of IIb SNe, and investigate a number of comparative metrics by which one might be able to remove transients from consideration without the use of spectroscopy. We provide a list of these objects and their classifications as well as a glossary of the transient types included in the sample.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Binary neutron stars in the next-generation era: Multi-messenger detection prospects and constraints on the equation of state, mass distribution, and cosmology

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    With ET (and ET+CE), mock multi-messenger BNS catalogues yield ~40–500 EM counterparts per year and, under ideal recovery, constrain R1.4 to ~0.2 km and H0 to ~1 km s−1 Mpc−1.

  2. nmma: An extended Bayesian framework for Nuclear Multimessenger Astronomy in the Era of Next-Generation Detectors

    astro-ph.IM 2026-07 accept novelty 6.0 of 10

    nmma now jointly samples nuclear EoS parameters with GW and EM data via TOV emulators and Fiesta surrogates, delivering 20–60× speedups and future H0–nuclear constraints.

  3. Confined Circumstellar Material as a Dust Formation Site in Type II Supernovae

    astro-ph.SR 2025-07 conditional novelty 6.0 of 10

    Dust can form efficiently in the cold dense shell created when a Type II supernova's ejecta hits confined circumstellar material, yielding up to 0.1 solar masses and infrared light that mimics kilonovae.

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