Implications of GW241011 for rotating exotic compact objects

N. V. Krishnendu; Tamara Evstafyeva; Aditya Vijaykumar; William E. East; Rimo Das; Sayantani Datta; Nils Siemonsen; Nami Uchikata; Poulami Dutta Roy; Anuradha Gupta; Ish Gupta; Syed U. Naqvi; Manuel Piarulli; Muhammed Saleem; Elise M. Sänger; Pratyusava Baral; Sajad A. Bhat; Thomas A. Callister; Mattia Emma; Carl-Johan Haster

arXiv · 2511.17341

Implications of GW241011 for rotating exotic compact objects

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Abstract

A number of theoretical proposals have been made for horizonless compact objects with masses and spins similar to those of black holes. While gravitational wave signatures from their mergers can resemble those of black holes, features like the spin-induced quadrupole moment may reveal their distinct nature. Using the tight bounds on the spin-induced quadrupole moment of GW241011, we place gravitational wave constraints on the nature of its primary. We find that large classes of exotic compact objects (including rotating boson stars) cannot explain its nature, however, models of sufficiently large compactness of $C \gtrsim 0.24$ may still be viable contenders.

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N. V. Krishnendu, Tamara Evstafyeva, Aditya Vijaykumar, William E. East, Rimo Das, Sayantani Datta, Nils Siemonsen, Nami Uchikata, Poulami Dutta Roy, Anuradha Gupta, Ish Gupta, Syed U. Naqvi, Manuel Piarulli, Muhammed Saleem, Elise M. Sänger, Pratyusava Baral, Sajad A. Bhat, Thomas A. Callister, Mattia Emma, Carl-Johan Haster. 2025-11-21. Implications of GW241011 for rotating exotic compact objects. https://arxiv.org/abs/2511.17341

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