Telescope will catch the 'ringing' of a neutron star ✦
Neutron star mergers produce gravitational waves, and as the stars draw near, tidal oscillations arise in their interiors, like 'stellar tremors.' This lets us peer inside a star. Scientists have found that the upcoming Einstein detector will be able to pick up such signals, even very faint ones—otherwise we risk misjudging the stars' properties. What else will these cosmic 'heartbeats' reveal?
When two нейтронные звёзды whirl in a merger dance, their tidal pull acts like a hammer striking a bell. If the striking frequency matches the star's natural frequency, it begins to resonate, emitting гравитационные волны — ripples spreading through the fabric of spacetime. The future Einstein Telescope will catch this 'ringing' and reveal the star's internal structure with a precision unattainable by ordinary astronomy.
Such resonance will show up in about one in three powerful mergers per year. Without correcting for it, the mass and size of the star would be measured incorrectly. The Einstein Telescope will surpass the first LIGO detector and complement observations of пульсаров — rapidly spinning neutron star lighthouses. Gravitational waves travel at the скоростью света through the расширяющуюся Вселенную, carrying the imprint of monstrous gravity: near the star, the искривление пространства is so extreme that замедление времени becomes noticeable. Amazingly, the frequency of this ringing often falls into the audible range — hundreds of hertz, like the note 'A'. Although there is no sound in a vacuum, gravitational waves can be converted into an audio signal to hear the 'voice' of the star.
🎯 The frequency of these oscillations is around 440 Hz, like the note 'A'. There's no sound in a vacuum, but gravitational waves can be translated into an audible signal.