Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session Q15: LIGO/Virgo Search and Data Analysis MethodsLive
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Sponsoring Units: DGRAV Chair: Jessica Mclver, The University of British Columbia Room: Virginia B |
Monday, April 20, 2020 10:45AM - 10:57AM Live |
Q15.00001: The burst search results from LIGO and Virgo O3A observing run Marek Szczepanczyk The first six months of the third observing run (O3A) of Advanced LIGO and Advanced Virgo brought plentiful of 33 public alerts. Several live searches were conducted for variety of gravitational-wave sources. The coherent Waveburst (cWB) algorithm searched for gravitational waves using minimal assumptions on the source morphologies. In my presentation I will first talk about the public alerts identified by cWB and the properties of possible sources. Then I will cover the search results from the offline analysis. [Preview Abstract] |
Monday, April 20, 2020 10:57AM - 11:09AM Live |
Q15.00002: Results from all-sky searches for continuous waves Vladimir Dergachev Continuous waves from non-axisymmetric neutron stars are orders of magnitude weaker than transient events from black hole and neutron star collisions. As continuous waves from galactic sources are expected to persist across an observing run the searches are carried out by integrating months of collected data. This greatly increases sensitivity, with a corresponding increase in analysis complexity. Loosely coherent searches are designed to cover large parameter spaces, trading off potential sensitivity of a single-target search for greater chance of detection. We will present results of all-sky search for neutron stars and other sources carried out by Falcon pipeline utilizing loosely coherent algorithms. [Preview Abstract] |
Monday, April 20, 2020 11:09AM - 11:21AM Live |
Q15.00003: Search for Intermediate-Mass Black Hole Binary Mergers During Advanced LIGO/Virgo's Third Observing Run Brendan O'Brien The Advanced LIGO and Advanced Virgo detectors can observe gravitational-wave emission from binary mergers containing an intermediate-mass black hole (IMBH) further than any other known source. The detection of such sources could transform our understanding of stellar evolution and could shed light to the formation of supermassive black holes. In this talk, we will discuss challenges of IMBH binary detection, possible astrophysical implications, and describe searches for IMBH binary systems during LIGO/Virgo's current third observing run. [Preview Abstract] |
Monday, April 20, 2020 11:21AM - 11:33AM Live |
Q15.00004: A Template-based Search for Intermediate Mass Black Hole Binaries: Advanced LIGO-Virgo in its 3rd Observing Run Debnandini Mukherjee The intermediate mass black holes have masses in the range of 100 to 100,000 solar masses and make up the mass space between the stellar mass and the supermassive black holes. The Advanced LIGO-Virgo detectors are more sensitive than before to gravitational waves from compact binary coalescences in its 3rd and present observing run. The rates of observation of gravitational wave sources with at least one intermediate mass black hole component, to which the detectors are currently sensitive, would help constrain their formation channel, which so far remains uncertain. Their observations could also point to a missing link between stellar mass and super massive black holes. In my talk I will discuss the search for these sources using pre-computed waveform templates by employing a matched-filter based search technique and will provide an update in light of the ongoing observing run. [Preview Abstract] |
Monday, April 20, 2020 11:33AM - 11:45AM Live |
Q15.00005: Validating Gravitational Wave Events Derek Davis In the current era of gravitational-wave astronomy, gravitational-wave detection is becoming a common occurrence. As the rate of detectable events grows, the process in which signals are distinguished from instrumental artifacts that pollute LIGO data has remained an essential step in gravitational-wave detection. In this talk I will show how analyses of gravitational waves from compact binaries are impacted by the characteristics of these instrumental artifacts. I will outline methods to better distinguish gravitational-wave events from common transients in LIGO data and to mitigate their impact on analyses of detected signals. I will explain how these procedures have been applied to validate recently announced gravitational-wave events. [Preview Abstract] |
Monday, April 20, 2020 11:45AM - 11:57AM Live |
Q15.00006: The Effect of Winds at the LIGO Hanford Observatory on the Search for Burst Gravitational Waves Amber Stuver, Ray Dean, Matt Caesar In this talk, we will discuss the impact of winds at the LIGO Hanford Observatory (LHO) on the search for gravitational wave bursts. It is well known that high winds at LHO can contribute to poorer data quality and lower duty cycles. In order to assess the potential impact of mitigating the effect of the wind by constructing a wind fence, investigations were performed on searches for unmodelled transients and general glitch rates from early O3a. Specifically, we show that higher winds consistently increase the false alarm probability of events produced by the coherent WaveBurst burst search. We also show that the rate of general glitches increases up to 900{\%} at the highest mean wind speeds observed. These results begin to characterize the effect of wind on the burst search and support the construction of a wind fence at LHO. [Preview Abstract] |
Monday, April 20, 2020 11:57AM - 12:09PM Not Participating |
Q15.00007: A Coherent Directed Search for Continuous Gravitational Waves from Supernova Remnants in the LIGO O3 Data Set Jonathan Wang The LIGO Scientific Collaboration and Virgo Collaboration search for gravitational waves from diverse astrophysical sources. These include fast-spinning neutron stars which possess a non-axisymmetry about their rotation axes, and consequently produce long-lived, nearly monochromatic gravitational waves, or continuous waves. Search methods used for detecting continuous waves depend on the prior information known about the source. Here we describe a templated search in O3 LIGO data, using the coherent F-statistic, for continuous waves from young supernova remnants. For this type of search, the source location is precisely known, but the signal frequency and its time derivatives are unknown. The status of the search and its characteristic parameters will be presented, along with validation tests of the method. [Preview Abstract] |
Monday, April 20, 2020 12:09PM - 12:21PM Not Participating |
Q15.00008: An All-Sky Search for Continuous Gravitational Waves in the LIGO O3 Data Set Aashish Tripathee The LIGO-Virgo O3 data set offers not only detection of now-familiar compact binary mergers of distant black holes and neutron stars, but potentially the detection of much weaker but continuous radiation from nearby rapidly spinning, non-axisymmetric neutron stars in the galaxy. All-sky searches for such radiation from previously unknown stars using necessarily long data sets are computationally challenging and have given rise to several different approaches. We describe here the application of the well established PowerFlux program, including the method of loose coherence in its outlier followup, to an all-sky search in the first six months of LIGO data from the O3 observing run. The status of the search and its chosen parameters will be presented. [Preview Abstract] |
Monday, April 20, 2020 12:21PM - 12:33PM Not Participating |
Q15.00009: Calibration Uncertainty of Advanced LIGO and its Effect on the Sensitivity of the gstlal compact binary coalescence Search Pipeline Madeline Stover, Madeline Wade Gravitational waves are ripples in spacetime that the LIGO (Laser Interferometer Gravitational-wave Observatory) Scientific Collaboration works to detect. Calibrating the data from these detectors is essential for the identification of gravitational-wave signals in the data. Once the data is calibrated, it needs to be searched for gravitational-wave signals. There is both statistical and systematic uncertainty introduced into LIGO's data during the calibration process. I have investigated the impact of calibration uncertainty on the spacetime volume sensitivity statistic of a gravitational-wave search for compact binary systems. In this talk, I will present my findings from this study. [Preview Abstract] |
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