Improved early warning of compact binary mergers using higher modes of gravitational radiation: a population study

A gravitational-wave (GW) early-warning of a compact-binary coalescence event, with sufficiently tight localisation skymap, would allow telescopes to point in the direction potential electromagnetic counterpart before its onset. This will enable astronomers extract valuable information complex astrophysical phenomena triggered around time merger. Use higher-modes gravitational radiation, addition dominant mode typically used templated real-time searches, was recently shown produce significant improvements times and skyarea localisations for range asymmetric-mass binaries. In this work, we perform large-scale study assess benefits method population compact binary merger observations. particular, inject 100,000 such signals Gaussian noise, component masses $m_1 \in \left[1, 60 \right] M_{\odot}$ $m_2 \left [1, 3 M_{\odot}$. We consider three scenarios involving ground-based detectors: fifth (O5) observing run Advanced LIGO-Virgo-KAGRA network, projected Voyager upgrade, as well proposed third generation (3G) network. find that fixed early warning $20-60$ seconds, inclusion higher modes can provide factor $\gtrsim 2$ up $\sim 60\%$ ($70 \%$) neutron star-black hole systems O5 (Voyager) scenario. Considering only those which counterparts, be expected 5-35\%$ $(20-50\%)$ binaries (Voyager), although areas themselves depend on distances. For 3G scenario, fraction events have gains minute several minutes, assuming fiducial target 100 1000 sq. deg.