Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544

Thomas D. Abbott , Matthew R. Abernathy , Fausto Acernese , Kendall Ackley , Carl Adams , Thomas Adams (1) , Paolo Addesso , Rana X. Adhikari , Vaishali B. Adya , Christoph Affeldt , Michalis Agathos , Kazuhiro Agatsuma , Nancy Aggarwal , Odylio D. Aguiar , Lorenzo Aiello , Anirban Ain , Bruce Allen , Annalisa Allocca , Paul A. Altin , Stuart B. Anderson , Warren G. Anderson , Koji Arai , Melody C. Araya , Cody C. Arceneaux , Joseph S. Areeda , Nicolas Arnaud (2) , Kg G. Arun , Stefano Ascenzi , Gregory Ashton , M. Ast , Stuart M. Aston , Pia Astone , Peter Aufmuth , Carsten Aulbert , Stanislav Babak , Philippe Bacon (3) , Maria K.M. Bader , Paul T. Baker , Francesca Baldaccini , Giulio Ballardin , Stefan W. Ballmer , Juan C. Barayoga , Sheena E. Barclay , Barry C. Barish , David Barker , Fabrizio Barone , Bryan Barr , Lisa Barsotti , Matteo Barsuglia (3) , Daniel Barta , Jeffrey Bartlett , Imre Bartos , Riccardo Bassiri , Andrea Basti , James C. Batch , Christoph Baune , Viswanath Bavigadda , M. Bazzan , Michal Bejger , Angus S. Bell , Beverly K. Berger , Gerald Bergmann , Christopher P.L. Berry , Diego Bersanetti , Alessandro Bertolini , Joseph Betzwieser , Swetha Bhagwat , Rohan Bhandare , Igor A. Bilenko , Garilynn Billingsley , Jeremy Birch , Ross Birney , Sebastien Biscans , Aparna Bisht , Massimiliano Bitossi , Christopher Biwer , Marieanne A. Bizouard (2) , J.K. Blackburn , Carl D. Blair , David G. Blair , Ryan M. Blair , Steven Bloemen , Oliver Bock , Michel Boer (4) , Gilles Bogaert (4) , C. Bogan , Alejandro Bohe , Charlotte Bond , Francois Bondu (5) , Romain Bonnand (1) , Boris A. Boom , Rolf Bork , Valerio Boschi , Sukanta Bose , Yann Bouffanais (3) , Antonella Bozzi , Carlo Bradaschia , Patrick R. Brady , Marica Branchesi , Jim E. Brau , Tristan Briant (6) , Alain Brillet (4) , Marc Brinkmann , Violette Brisson (2) , Patrick Brockill , Jacob E. Broida , Aidan F. Brooks , Duncan A. Brown , Daniel D. Brown , Nicolas M. Brown , Sharon Brunett , Christopher C. Buchanan , Aaron Buikema , Tomasz Bulik , Henk J. Bulten , Alessandra Buonanno , Damir Buskulic (1) , Christelle Buy (3) , Robert L. Byer , Miriam Cabero , Laura Cadonati , Giampietro Cagnoli (7) , Craig Cahillane , J. Calderón Bustillo , Thomas Callister , Enrico Calloni , Jordan B. Camp , Kipp C. Cannon , Junwei Cao , Collin D. Capano , Eleonora Capocasa (3) , Franco Carbognani , Santiago Caride , J. Casanueva Diaz (2) , Claudio Casentini , Sarah Caudill , Marco Cavaglià , Fabien Cavalier (2) , Roberto Cavalieri , Giancarlo Cella , Christian B. Cepeda , L. Cerboni Baiardi , Giovanni Cerretani , Elisabetta Cesarini , Sydney J. Chamberlin , Manleong Chan , Shiuh Chao , Philip Charlton , E. Chassande-Mottin (3) , Belinda D. Cheeseboro , H.Y. Chen , Yanbei Chen , Chun Cheng , Andrea Chincarini , Antonino Chiummo , Heesuk S. Cho , M. Cho , Jong H. 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Vine , J.-Y. Vinet (4) , Salvatore Vitale , Thomas Vo , Helios Vocca , Cheryl Vorvick , D.V. Voss , Will D. Vousden , Sergey P. Vyatchanin , Andrew R. Wade , Leslie E. Wade , Madeline Wade , Marissa Walker , Larry Wallace , Sinead Walsh , Gang Wang , Haoyu Wang , Mengyao Wang , Xiaoge Wang , Yan Wang , Robert L. Ward , Jim Warner , Michal Was (1) , Betsy Weaver , L.-W. Wei (4) , Michael Weinert , Alan J. Weinstein , Rainer Weiss , Linqing Wen , Peter Weßels , Tobias Westphal , Karl Wette , John T. Whelan , Bernard F. Whiting , Roy D. Williams , Andrew R. Williamson , Joshua L. Willis , Benno Willke , Maximilian H. Wimmer , Walter Winkler , Christopher C. Wipf , Holger Wittel , Graham Woan , Janis Woehler , John Worden , Jennifer L. Wright , David S. Wu , Guimin Wu , Joshua Yablon , William Yam , Hiro Yamamoto , Cregg C. Yancey , Hang Yu , Michel Yvert (1) , Adam Zadrożny , Lisa Zangrando , Michele Zanolin , J.-P. Zendri , Michael Zevin , Liyuan Zhang , Mi Zhang , Yuanhao Zhang , Chunnong Zhao , Minchuan Zhou , Zifan Zhou , Xingjiang Zhu , Michael E. Zucker , Sarah E. Zuraw , J. Zweizig

1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 APC (UMR_7164) - AstroParticule et Cosmologie
4 OCA - Observatoire de la Côte d'Azur
5 IPR - Institut de Physique de Rennes
6 LPTHE - Laboratoire de Physique Théorique et Hautes Energies
7 LMA - Laboratoire des matériaux avancés
8 ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris

We describe a directed search for continuous gravitational waves in data from the sixth initial LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of ≈2.7  kpc. The search covered a broad band of frequencies along with first and second frequency derivatives for a fixed sky position. The search coherently integrated data from the two LIGO interferometers over a time span of 9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0×10-25 on intrinsic strain and 8.5×10-6 on fiducial ellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spin-down ages older than 300 years and are within the range of theoretical predictions for possible neutron-star ellipticities. An important feature of this search was use of a barycentric resampling algorithm which substantially reduced computational cost; this method is used extensively in searches of Advanced LIGO and Virgo detector data.

Keywords: energy: conservation law; gravitational radiation; gravitational radiation detector; gravitational radiation: emission; gravitational radiation: direct detection; LIGO; neutron star; interferometer; VIRGO; star: cluster

Domains: General Relativity and Quantum Cosmology [gr-qc]; Astrophysics [astro-ph]

Thomas D. Abbott, Matthew R. Abernathy, Fausto Acernese, Kendall Ackley, Carl Adams, et al.. Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544. Phys.Rev.D, 2017, 95 (8), pp.082005. ⟨10.1103/PhysRevD.95.082005⟩. ⟨hal-03143735⟩