Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B09: Gravitational Wave Astronomy: Surveys & DetectorsLive
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Sponsoring Units: DAP Chair: Soumi De, LANL |
Saturday, April 17, 2021 10:45AM - 10:57AM Live |
B09.00001: Determination of the light exposure on the photodiodes of a new instrumented baffle for the Virgo input mode cleaner end-mirror Alba Romero-Rodríguez As part of the upgrade program of the Advanced Virgo interferometer, the installation of new instrumented baffles surrounding the main test masses is foreseen. As a demonstrator, and to validate the technology, the existing baffle in the area of the input mode cleaner end-mirror will be first replaced by a baffle equipped with photodiodes. This paper presents detailed simulations of the light distribution on the input mode cleaner baffle. They served to validate the proposed layout of the sensors in the baffle, and determine the light exposure of the photodiodes under different scenarios of the interferometer operations, in order to define mitigation strategies for preserving the detector integrity. [Preview Abstract] |
Saturday, April 17, 2021 10:57AM - 11:09AM Live |
B09.00002: Results from Falcon all-sky searches for continuous waves Vladimir Dergachev, Maria Alessandra Papa 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 throughout an observing run the searches integrate 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 sensitivity with breadth for greater chance of detection. We will present results of all-sky searches for neutron stars and other sources carried out by Falcon pipeline utilizing loosely coherent algorithms. [Preview Abstract] |
Saturday, April 17, 2021 11:09AM - 11:21AM Live |
B09.00003: Identifying Type-II Strongly-Lensed Gravitational-Wave Images in Third-Generation Gravitational-Wave Detectors Yijun Wang, Rico K.L. Lo, Alvin K.Y. Li, Yanbei Chen Strong gravitational lensing is a gravitational wave (GW) propagation effect that influences the inferred GW source parameters and the cosmological environment. Identifying strongly-lensed GW images is challenging as waveform amplitude magnification is degenerate with a shift in the source intrinsic mass and redshift. However, even in the geometric-optics limit, Type-II strongly-lensed images cannot be fully matched by Type-I (or unlensed) waveform templates, especially with large binary mass ratios and orbital inclination angles. We propose to use this mismatch to distinguish individual Type-II images. Using planned noise spectra of Cosmic Explorer, Einstein Telescope and LIGO Voyager, we show that a significant fraction of Type-II images can be distinguished from unlensed images, given sufficient SNR ($\sim 30$). We predict the detection rate of lensed GW sources with detectable Type-II images to be 172.2, 118.2 and 27.4 per year for CE, ET and LIGO Voyager, respectively. Among these detectable events, 33.1, 7.3 and 0.22 percent will be distinguishable via their Type-II images with a log Bayes factor larger than 10. We conclude that such distinguishable events are likely to appear in the third-generation detector catalog and supplement existing strong lensing search strategies. [Preview Abstract] |
Saturday, April 17, 2021 11:21AM - 11:33AM Live |
B09.00004: The GRB-Triggered Search for Gravitational Waves in Advanced LIGO and Virgo's Third Observing Runs Ryan Fisher The combined observation of GRB 170817A and GW170817 marked the first multimessenger success of gravitational wave astronomy. Although no further coincident observations were found in the second observing run of Advanced LIGO and Advanced Virgo, we continued this search in the third observing run, which concluded on Mar 27, 2020. This talk will present the current status of the effort to conduct template-based searches for gravitational waves in Advanced LIGO and Advanced Virgo data, triggered by GRBs disseminated by the Gamma-ray Coordinates Network (GCN). This talk will discuss both the high-latency, full analysis and efforts that were made to bring a lightweight, rapid-followup analysis into production. [Preview Abstract] |
Saturday, April 17, 2021 11:33AM - 11:45AM Live |
B09.00005: Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data Yuanhao Zhang, Maria Alessandra Papa, Badri Krishnan, Anna L. Watts The low-mass X-ray binary Scorpius X-1 is one of the most promising continuous gravitational-wave sources for ground-based detectors. We use an improved method to search for signals with nearly constant frequency from Scorpius X-1 in the range of 40-180 Hz in LIGO O2 public data. Thanks to the efficiency of the search pipeline we can use a long coherence time and achieve unprecedented sensitivity, significantly improving on existing results. This is the first search that has been able to probe gravitational wave amplitudes that could balance the accretion torque at the neutron star radius. Our search excludes emission at this level between 67.5 Hz and 131.5 Hz, for an inclination angle $44^\circ\pm 6^\circ$ derived from radio observations (Fomalont et al. 2001), and assuming that the spin axis is perpendicular to the orbital plane. If the torque arm is 26 km -- a conservative estimate of the Alfv\'{e}n radius -- our results are more constraining than the indirect limit across the band. This allows us to exclude certain mass-radius combinations and to place upper limits on the strength of the star's magnetic field with a different probe than ever used before. In this talk, I'm going to present our results and discuss the physical interpretation of the neutron star. [Preview Abstract] |
Saturday, April 17, 2021 11:45AM - 11:57AM Live |
B09.00006: The LIGO HET Response (LIGHETR) Project to Discover and Spectroscopically Follow Optical Transients Associated with Neutron Star Mergers María José Bustamante Rosell, Craig Wheeler, Karl Gebhardt, Aaron Zimmerman, Richard Matzner, Greg Zeimann, Matthew Shetrone, Steven Janowiecki, Pawan Kumar, David Pooley, Benjamin P. Thomas, Chad Hanna, David Radice, Lifan Wang, Sijie Chen, Jozsef Vinkó, David Sand, Chris Fryer, Oleg Korobkin, Ryan Wollaeger, Frederic V. Hessman, Kristen B. McQuinn The LIGO HET Response (LIGHETR) project is a group of several institutions performing spectroscopic followup of gravitational wave sources discovered by the LIGO/Virgo collaboration (LVC). LIGHETR uses two integrated field unit spectrographs (IFUs) with deep coverage in the blue, VIRUS and LRS2, both mounted on the 11 m Hobby Ebberly Telescope (HET). Our strategy is to target the most probable galaxies within the LVC sky-map, with the aim to acquire the earliest, rapidly varying, blue spectra of the electromagnetic counterparts. Alternatively, we also perform follow-up on transient candidates identified by other observatories. The unique challenges of the observations (fixed zenith angle, IFUs) necessitate custom pipelines for rapid observation planning and data reductions using novel techniques which will be presented here. [Preview Abstract] |
Saturday, April 17, 2021 11:57AM - 12:09PM Live |
B09.00007: Searching for joint gravitational-wave and high energy neutrino events with LLAMA Doga Veske, Stefan Countryman, Yasmeen Asali, Zsuzsa Marka, Imre Bartos, Szabolcs Marka Multi-messenger detections allow us to learn more about the astrophysical sources by probing different physics and also by guiding the astronomers more precisely with low latency follow-ups. We will present the statistically optimal methods for multi-messenger searches and summarize the joint gravitational-wave and high energy neutrino event searches' results of Low Latency Algorithm for Multi-messenger Astrophysics (LLAMA) with IceCube's neutrinos and LIGO/Virgo's public detections and announcements. [Preview Abstract] |
Saturday, April 17, 2021 12:09PM - 12:21PM Live |
B09.00008: Early warning gravitational-wave alerts RYAN Magee, Leo Singer, Deep Chatterjee, Surabhi Sachdev, Geoffrey Mo, Manoj Kovalam Gravitational-wave observations became commonplace in Advanced LIGO/Virgo's recently concluded third observing run. 56 non-retracted candidates were identified and publicly announced in near real time. Gravitational waves from binary neutron star mergers, however, remain of special interest since they can be precursors to high-energy astrophysical phenomena like $\gamma$-ray bursts and kilonovae. While late-time electromagnetic emissions provide important information about the astrophysical processes within, the prompt emission along with gravitational waves uniquely reveals the extreme matter and gravity in the aftermath of the merger. Rapid communication of source location and properties from the gravitational-wave data is crucial to facilitate multi-messenger follow-up of such sources. This is especially enabled if the partner facilities are forewarned via an early-warning (pre-merger) alert. Here we describe the commissioning and performance of such a low-latency infrastructure within LIGO/Virgo. We present results from an end-to-end mock data challenge that detects binary neutron star mergers and alerts partner facilities before merger. We set expectations for these alerts in future observing runs. [Preview Abstract] |
Saturday, April 17, 2021 12:21PM - 12:33PM Live |
B09.00009: Controlling Outlier Contamination In MultimessengerTime-domain Searches For Supermasssive Binary Black Holes Qiaohong Wang, Stephen R. Taylor A versatile outlier mitigation method tuned for multimessenger time-domain searches for supermassive binary black holes has yet to be fully explored. In an effort to perform robust outlier isolation with lower computational costs, we propose a Gibbs sampling approach. Our method provides structural simplicity to outlier modeling and isolation, as it requires only small alterations when adapting to each hierarchical time-domain model. We robustly diagnose outliers present in simulated pulsar-timing datasets, and then further apply our methods to pulsar J1909-3744 from the NANOGrav 9-yr Dataset. We also explore the periodic AGN candidate PG1302-102 using datasets from the Catalina Real-time Transient Survey (CRTS), All-Sky Automated Survey for Supernovae (ASAS-SN), and the Lincoln Near-Earth Asteroid Research (LINEAR). We present our findings and outline future work that could improve outlier modeling and isolation for multimessenger time-domain searches. [Preview Abstract] |
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