ZTF25abjmnps (AT2025ulz) and S250818k: A candidate superkilonova from a subthreshold subsolar gravitational-wave Trigger
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00643697" target="_blank" >RIV/68378271:_____/25:00643697 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0375366" target="_blank" >https://hdl.handle.net/11104/0375366</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/ae2000" target="_blank" >10.3847/2041-8213/ae2000</a>
Alternative languages
Result language
angličtina
Original language name
ZTF25abjmnps (AT2025ulz) and S250818k: A candidate superkilonova from a subthreshold subsolar gravitational-wave Trigger
Original language description
On 2025 August 18, the LIGO-Virgo-KAGRA collaboration reported gravitational waves from a subthreshold binary neutron star merger. If astrophysical, this event would have a surprisingly low chirp mass, suggesting that at least one neutron star was below a solar mass. The Zwicky Transient Facility mapped the coarse localization and discovered a transient, ZTF 25abjmnps (AT2025ulz), which was spatially and temporally coincident with the gravitational-wave trigger. The first week of follow-up suggested properties reminiscent of a GW170817-like kilonova. Subsequent follow-up suggests properties most similar to a young, stripped-envelope, Type IIb supernova. Although we cannot statistically rule out chance coincidence, we undertake due diligence analysis to explore the possible association between ZTF 25abjmnps and S250818k. Theoretical models have been proposed wherein subsolar neutron star(s) may form (and subsequently merge) via accretion-disk fragmentation or core fission inside a core-collapse supernova-i.e., a „superkilonova.“ Here, we qualitatively discuss our multiwavelength dataset in the context of the superkilonova picture. Future higher-significance gravitational-wave detections of subsolar neutron star mergers with extensive electromagnetic follow-up would conclusively resolve this tantalizing multimessenger association.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal Letters
ISSN
2041-8205
e-ISSN
2041-8213
Volume of the periodical
995
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
L59
UT code for WoS article
001639092700001
EID of the result in the Scopus database
2-s2.0-105033952371