Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session E3: LIGO/Virgo and Holometer Searches for Continuous-wave, Burst and Supernova Signals |
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Sponsoring Units: DGRAV Chair: Jacob Slutsky, University of Maryland - Baltimore County Room: Maryland C |
Saturday, January 28, 2017 3:30PM - 3:42PM |
E3.00001: Searches for Continuous Gravitational Waves in LIGO and Virgo Data Keith Riles The LIGO Scientific Collaboration and Virgo Collaboration have carried out searches for periodic continuous gravitational waves. These analyses range from targeted searches for gravitational-wave signals from known pulsars, for which precise ephemerides from radio or X-ray observations are available, to all-sky searches for unknown neutron stars, including stars in unknown binary systems. Between these extremes lie directed searches for known stars of unknown spin frequency or for new unknown sources at specific locations. These different types of searches will be presented, including final results from the Initial LIGO and Virgo data runs and, where available, new results from searches of early Advanced LIGO data. [Preview Abstract] |
Saturday, January 28, 2017 3:42PM - 3:54PM |
E3.00002: Broadband searches for continuous gravitational waves Vladimir Dergachev Isolated rotating neutron stars are expected to emit gravitational radiation of nearly constant frequency and amplitude. Searches for such radiation from unknown stars are computationally limited, with all-sky searches of initial LIGO and Virgo data achieving sensitivity to strains smaller than $10^{-24}$. Because CW amplitudes are thought to be extremely weak, long time integrations must be carried out to detect a signal. Integration is complicated by the motion of the Earth (daily rotation and orbital motion) which induces substantial modulations of detected frequency and amplitude that are highly dependent on source location. Large volumes of acquired data make this search computationally difficult. We will present recently published results and discuss algorithms used to analyze large volumes of data. [Preview Abstract] |
Saturday, January 28, 2017 3:54PM - 4:06PM |
E3.00003: Hierarchical follow-up of outliers in all-sky searches for continuous gravitational waves Sinead Walsh Rapidly rotating neutron stars are promising sources of continuous gravitational waves for the LIGO and Virgo interferometers. All-sky searches for isolated neutron stars offer the potential to detect gravitational waves from neutron stars which have not been observed electromagnetically. These all-sky searches cover a broad parameter space in frequency and spindown, requiring a huge number of templates in parameter space to avoid having too much distance between a potential signal and the nearest template. The large trials factors result in many outliers due to random noise, and additional outliers are produced by detector artifacts. In this talk, I present a hierarchical approach to processing the results of an all-sky search. This approach is designed so that at each hierarchical stage, the significance of a cell harbouring a real signal will increase, while the significance of a cell that does not contain a signal will not increase. Thus we are sensitive to signals that would otherwise be hidden by the noise background. [Preview Abstract] |
Saturday, January 28, 2017 4:06PM - 4:18PM |
E3.00004: Hunting for continuous gravitational waves from unknown neutron stars in binary systems in Advanced LIGO data Evan Goetz Non-axisymmetric, rapidly rotating neutron stars are predicted to emit quasi-monochromatic gravitational waves. Accretion from a companion star may drive asymmetries of the neutron star causing it to emit gravitational waves, perhaps even after accretion has subsided. Searching for unknown sources in binary systems is a significant computational challenge. In this talk, I will describe a search method, called TwoSpect, that has been developed to search for unknown sources in binary systems; show results from the TwoSpect search of initial LIGO/Virgo data; describe recent improvements to TwoSpect and other semi-coherent methods; and provide an outlook on TwoSpect searches in the advanced detector era. [Preview Abstract] |
Saturday, January 28, 2017 4:18PM - 4:30PM |
E3.00005: Searching for Gravitational Waves from Scorpius X-1 in Advanced LIGO Data Yuanhao Zhang The low-mass X-ray binary Scorpius X-1 (Sco X-1) is considered to be one of the most promising continuous gravitational-wave(GW) sources for ground-based detectors. The improved sensitivity of advanced detectors and multiple improved search methods bring us closer to detecting an astrophysically feasible GW signal from Sco X-1. I will present an update on the search for GWs from Sco X-1 in data from Advanced LIGO's first observing run (O1). [Preview Abstract] |
Saturday, January 28, 2017 4:30PM - 4:42PM |
E3.00006: Results from a MHz gravitational wave search using the Fermilab Holometer Brittany Kamai The Fermilab Holometer, two nested 40 meter Michelson interferometers, has extended the accessible gravitational wave frequency range from kHz to a broad range of MHz frequencies. I will present results from a 130-hr campaign that measured the energy density of gravitational waves in the MHz band. Additionally, this dataset was used to place constraints on the abundance of primordial black hole binaries. [Preview Abstract] |
Saturday, January 28, 2017 4:42PM - 4:54PM |
E3.00007: The all-sky search for short-duration gravitational-wave bursts with Advanced LIGO Ryan Lynch Sources of gravitational-wave transients include some of the most energetic events in the universe. In addition to the merger of compact stellar remnants, sources may include the core-collapse of massive stars, neutron star glitches, and cosmic string cusps. Searches for this latter category of transients often make minimal assumptions regarding their exact waveform morphologies, and are thus referred to as unmodeled searches. A network of the Advanced LIGO gravitational-wave detectors recently completed its first scientific data collection run. In this talk, we describe the all-time, all-sky search for unmodeled gravitational-wave transients in Advanced LIGO data. [Preview Abstract] |
Saturday, January 28, 2017 4:54PM - 5:06PM |
E3.00008: Extracting Physics from Gravitational Waves from Core-Collapse Supernovae Marek Szczepanczyk Core-Collapse Supernovae (CCSN) are the spectacular and violent deaths of massive stars. In my presentation I will give an overview of searches targeting supernova signals in LIGO and Virgo data. In particular I will present results of a search for gravitational waves from CCSN, performed in initial LIGO and Virgo data including the methodology, upper limits and model exclusion statements. I will also describe the current efforts towards parameter estimation and waveform reconstruction. [Preview Abstract] |
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