Resolves YES if between 01 Jan 2023 and 31 Dec 2024 an article reporting conclusive spectral biosignatures of one or more exoplanets is published in a scientific journal with two-year impact factor (latest value) no less than 3.

Market will resolve YES no earlier than two months after the candidate publication, to give time for post-publication critical peer reviews of the paper to be posted. "Conclusive" generally means at >5σ level, but I leave the final judgement to myself. I am not an astrophysicist, but I have a PhD in optical spectroscopy, so I'm sure I can evaluate the arguments for and against the publication.

Note: Had this market been for 2023, the following paper would not have been deemed "conclusive" by me:
Madhusudhan, N., Sarkar, S., Constantinou, S., Holmberg, M., Piette, A. A., & Moses, J. I. (2023). Carbon-bearing molecules in a possible hycean atmosphere. The Astrophysical Journal Letters, 956(1), L13. (ArXiV PDF)