LIGO Document P2500402-v16
- We report the observation of gravitational waves from two binary black hole coalescences during the fourth observing run of the LIGO--Virgo--KAGRA detector network, GW241011 and GW241110. The sources of these two signals are characterized by rapid and precisely measured primary spins, non-negligible spin--orbit misalignment, and unequal mass ratios between their constituent black holes. These properties are characteristic of binaries in which the more massive object was itself formed from a previous binary black hole merger, and suggest that the sources of GW241011 and GW241110 may have formed in dense stellar environments in which repeated mergers can take place. As the third loudest gravitational-wave event published to date, with a median network signal-to-noise ratio of 36.7, GW241011 furthermore yields stringent constraints on the Kerr nature of black holes, the multipolar structure of gravitational-wave generation, and the existence of ultralight bosons within the mass range $10^{-13}$--$10^{-12}$ eV.
- v1: Draft for CBC circulation
v2: Draft for first LVK circulation
v3: Draft for second LVK circulation
v4: Draft for LVK management approval
v5: Draft addressing LVK management comments
v6: Draft addressing additional management comments
v7: Draft addressing more management comments
v8: Draft addressing a last management comment
v9: Contains edits addressing referee comments, and drafted referee response
v10: Minor updates
v11: Edits in response to second round of referee comments, drafted referee response
v12: Version to be resubmitted to journal
v13: Version to be resubmitted to journal, with updated referee response
v14: Version resubmitted to journal (after acceptance), with updated author list following v5 of https://dcc.ligo.org/LIGO-T2500088 (with paper-specific opt-outs/ins)
v15: Matches published version
v16: Removes line numbers, remaining highlighting
- Published in ApJ Letters vol. 993 pg. L21.
- DOI: 10.3847/2041-8213/ae0d54
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