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astronomy instrumentation 1exoplanet biosignatures 1habitable worlds observatory 1high-contrast imaging 1ultraviolet spectroscopy 1

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astro-ph.HE2024

Whispering in the dark: Faint X-ray emission from black holes with OB star companions

Koushik Sen, Ileyk El Mellah, Norbert Langer +3

Context. Recent astrometric and spectroscopic surveys of OB stars have revealed a few stellar-mass black holes (BHs) with orbital periods as low as 10 days. No X-ray counterpart ha…