AT2025ulz and S250818k: Leveraging DESI spectroscopy in the hunt for a kilonova associated with a subsolar-mass gravitational-wave candidate

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© 2026. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

• Accepted: 6 February 2026
• Published (online): 9 April 2026
• Published: 10 April 2026

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