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Precessing Binaries: Astrophysical Expectations

Precessing Binaries: Astrophysical Expectations. Vicky Kalogera Physics & Astronomy Dept Northwestern University with Philippe Grandclement Mia Ihm. Precession and Inspiral Waveforms. Compact object binaries can precess if spins are of significant magnitude and misaligned with

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Precessing Binaries: Astrophysical Expectations

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  1. Precessing Binaries: Astrophysical Expectations Vicky Kalogera Physics & Astronomy Dept Northwestern University with Philippe Grandclement Mia Ihm

  2. Precession and Inspiral Waveforms Compact object binaries can precess if spins are of significant magnitude and misaligned with respect to the orbital angular momentum. Precession can modify inspiral waveforms and decrease thedetection efficiency of standard non-precession searches. Precession effects are more important for binaries of high mass ratios (BH-NS) and with spin tilt angles of the massive object in excess of ~30°. (Apostolatos 95)

  3. BH Asymmetric supernova explosions can tilt the orbital plane relative to the spin of the non-exploding star. BH NS Q: What is the origin of spin tilt angles in compact object binaries ? Mass transfer episodes in binaries tend to align spin and orbital angular momentum vectors. SN + NS kick

  4. Grandclement et al. 2003 VK 2000 10 Mo BH 1.4 Mo NS BH-NS Q: What are the expected spin tilt angles ? > model BH-NS progenitors and SN kick effects BH-NS binaries are expected to have significant spin tilt angles

  5. with non-precessing templates: detection rate decreases Rdet decrease depends on spin magnitude and tilt angle: templates that can mimic the precession effects can increase the detection rate: Maximum BH spin cos(spin tilt angle) cos(spin tilt angle) Grandclement, VK, Vecchio 2002 Grandclement & VK 2003 Grandclement, Ihm, VK, Belczynski 2003 Buonanno et al. 2003 Pan et al. 2003 Precessing inspiral binaries For a 10-1.4 Mo BH-NS binary

  6. Grandclement, Ihm, VK, Belczynski 2003 Rate drop expected from astrophysical predictions for spin tilts in BH-NS binaries Expected rates: BH-NS 1.5 -1500 per yr 3x10-4 -0.3 BH-BH 15 -10,000 per yr 4x10-3 -3 rate drop by 20-30% 3 BH-NS BH-NS BH spin magnitude

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