Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session K14: Advanced LIGO Methods and Results II |
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Sponsoring Units: GGR Chair: Sarah Caudill, University of Western Michigan Room: 251AB |
Sunday, April 17, 2016 1:30PM - 1:42PM |
K14.00001: The PyCBC search pipeline for detecting gravitational waves from compact binary mergers Alexander Nitz We present the matched-filtering based PyCBC offline pipeline used to analyze the first Advanced LIGO observing run. The search has been developed to find gravitational waves from the mergers of black holes and neutron stars with a total mass between 2 and 100 solar masses using a bank of templates. We describe the techniques used to extract signals, suppress non-Gaussian noise transients, and estimate the background of false alarms. [Preview Abstract] |
Sunday, April 17, 2016 1:42PM - 1:54PM |
K14.00002: Advanced LIGO stream-based offline search for compact binary coalescences Surabhi Sachdev Advanced LIGO detectors recently finished taking data for the first observing run. The GstLAL matched filter search looked for gravitational waves from coalescence of compact binary objects with component masses greater than 1 solar mass and total mass upto 100 solar mass, and component spins aligned with the angular momentum. We report on this search carried on the Advanced LIGO data. [Preview Abstract] |
Sunday, April 17, 2016 1:54PM - 2:06PM |
K14.00003: Applying Data Quality to the Searches for Compact Binary Coalescences in the First Observing Run of Advanced LIGO Laura Nuttall Crucial to the searches for gravitational wave transients in Advanced LIGO data is the characterization of the detectors to understand and mitigate noise artifacts which could mimic a gravitational wave signature. During the 4 month observing run of Advanced LIGO which concluded in January of this year, the LIGO detectors were assessed in close to real-time and vital information fed back to the transient searches regarding how to address features in data caused by environmental conditions and hardware concerns. This talk discusses the main data quality challenges faced by transient searches targeting gravitational waves from compact binary coalescences, in addition to the impact this information had on the sensitivity of these searches. [Preview Abstract] |
Sunday, April 17, 2016 2:06PM - 2:18PM |
K14.00004: The ``Uberbank'': A search for compact binary coalescences in the first Observing run of Advanced LIGO Collin Capano Modeled searches for gravitational waves from compact binary coalescence (CBC) use a ``bank'' of template waveforms to search the wide range of parameters that binaries may have. Recent advances in waveform modeling and template placement techniques have opened up the possibility to efficiently search for systems with non-precessing spin, using waveforms that model the inspiral, merger, and ringdown of coalescing binaries. I discuss how these advances were combined to produce the template bank used to search for CBCs in the first observing run of Advanced LIGO. This bank covered the full range of plausible masses and non-precessing spins of binary neutron stars, stellar-mass binary black holes, and binaries consisting of a neutron star and a stellar-mass black hole. [Preview Abstract] |
Sunday, April 17, 2016 2:18PM - 2:30PM |
K14.00005: Searching for Gravitational Waves from Compact Binaries with Precessing Spins Ian Harry, Alejandro Bohe, Stephen Privitera, Alessandra Buonanno Compact binary searches with aligned-spin (non-precessing) waveform templates are now well-established within LIGO/Virgo. The use of precessing-spin templates is still disfavored as these have never been shown to actually improve search sensitivity. However, even a single observation of a highly precessing compact binary merger could provide unique astrophysical insights into the formation of these sources. Here, we demonstrate a new method to search for gravitational waves from the merger of binary black holes and neutron-star--black-hole binaries with precessing spins. We also quantify the improvement, in terms of search sensitivity, that using this new method will provide. [Preview Abstract] |
Sunday, April 17, 2016 2:30PM - 2:42PM |
K14.00006: Searching for Intermediate Mass Black Holes with Advanced LIGO Laleh Sadeghian, Leslie Wade Intermediate Mass Black Holes (IMBHs) are conjectured to occupy the mass space between stellar-mass and super-massive black holes, roughly between $100$ and $10^5$ solar masses. The coalescence and merger of IMBH binaries with masses of a few hundred solar masses is an intriguing possible source of gravitational waves for Advanced LIGO and Advanced Virgo. A single detection of an IMBH binary merger would provide the first unambiguous proof of IMBH existence. Searches for these sources have started on data collected by the Advanced LIGO since September 2015. In this talk I will present a search method for these sources in the advanced detector era, based on known signal morphology. [Preview Abstract] |
Sunday, April 17, 2016 2:42PM - 2:54PM |
K14.00007: Expanding the Search Parameter Space for Low Latency Compact Binary Searches Stephen Privitera Searches for compact binary signals in gravitational wave data are continually progressing towards providing results in the lowest latency possible. Rapid identification of candidate events in these searches is crucial for a number of reasons, including (i) maximizing the probability of associating the event with its electromagnetic counterpart, if any, (ii) knowing whether to followup an event electromagnetically at all, in case the event is known to have no counterpart, (iii) allowing for detailed followup investigations into the detector state at the time of the event, in case of an interesting candidate, and (iv) identifying and correcting problems in the detectors that are impacting search backgrounds, in case of a false alarm. In this talk, we report on progress towards expanding the online parameter space for compact binary searches beyond what ran in LIGO's first observing run, to ensure as many as possible of our scientific targets are reaping the benefits of low latency identification. [Preview Abstract] |
Sunday, April 17, 2016 2:54PM - 3:06PM |
K14.00008: Classifying glitches and improving data quality of Advanced LIGO gravitational-wave searches Marco Cavaglia, Jade Powell, Daniele Trifiro, Ik Siong Heng Noise of non-astrophysical origin contaminates science data taken by the Advanced Laser Interferometer Gravitational-wave Observatory (aLIGO) and Advanced Virgo gravitational-wave detectors. Characterization of instrumental and environmental noise transients has proven critical in identifying false positives in the first aLIGO observing run O1. In this talk, we present three algorithms designed for the automatic classification of non-astrophysical transients in advanced detectors. Principal Component Analysis for Transients (PCAT) and an adaptation of LALInference Burst (LIB) are based on Principal Component Analysis. The third algorithm is a combination of a glitch finder called Wavelet Detection Filter (WDF) and machine learning techniques for classification. PCAT was used in O1 and earlier engineering runs to identify and characterize observed noise transients in aLIGO data. LIB and WDF are expected to join the quest in the upcoming aLIGO-Advanced Virgo observing run O2. [Preview Abstract] |
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