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High accuracy measurement of gravitational wave back-reaction in the OJ287 black hole binary

Published online by Cambridge University Press:  29 January 2019

Mauri J. Valtonen
Affiliation:
Department of Physics and Astronomy, University of Turku, Väisäläntie 20, FIN-21500, Kaarina, Finland email: mvaltonen2001@yahoo.com Finnish Centre for Astronomy with ESO, University of Turku, Väisäläntie 20, FIN-21500 Kaarina, Finland
L. Dey
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India
R. Hudec
Affiliation:
Astronomical Institute, The Czech Academy of Sciences, 25165 Ondřejov, Czech Republic Czech Technical University in Prague, Faculty of Electrical Engineering, Prague, Czech Republic
S. Zola
Affiliation:
Astronomical Observatory, Jagiellonian University, ul. Orla 171, Cracow PL-30-244, Poland Mt. Suhora Astronomical Observatory, Pedagogical University, ul. Podchorazych 2, PL30-084 Cracow, Poland
A. Gopakumar
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India
S. Mikkola
Affiliation:
Department of Physics and Astronomy, University of Turku, Väisäläntie 20, FIN-21500, Kaarina, Finland email: mvaltonen2001@yahoo.com
S. Ciprini
Affiliation:
Agenzia Spaziale Italiana (ASI) Space Science Data Center, I-00133 Roma, Italy Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy
K. Matsumoto
Affiliation:
Astronomical Institute, Osaka Kyoiku University, 4-698 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
K. Sadakane
Affiliation:
Astronomical Institute, Osaka Kyoiku University, 4-698 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
M. Kidger
Affiliation:
Herschel Science Centre, ESAC, European Space Agency, 28691 Villanueva de la Cañada, Madrid, Spain
K. Gazeas
Affiliation:
Department of Astrophysics, Astronomy and Mechanics, National & Kapodistrian University of Athens, Zografos GR-15784, Athens, Greece
K. Nilsson
Affiliation:
Finnish Centre for Astronomy with ESO, University of Turku, Väisäläntie 20, FIN-21500 Kaarina, Finland
A. Berdyugin
Affiliation:
Department of Physics and Astronomy, University of Turku, Väisäläntie 20, FIN-21500, Kaarina, Finland email: mvaltonen2001@yahoo.com
V. Piirola
Affiliation:
Department of Physics and Astronomy, University of Turku, Väisäläntie 20, FIN-21500, Kaarina, Finland email: mvaltonen2001@yahoo.com Kiepenheuer-Institut für Sonnenphysik, D-79104 Freiburg, Germany
H. Jermak
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, Brownlow Hill, L3 5RF, UK
K.S. Baliyan
Affiliation:
Physical Research Laboratory, Ahmedabad 380009, India
D. E. Reichart
Affiliation:
University of North Carolina at Chapel Hill, Chapel Hill, North Carolina NC 27599, USA
D. B. Caton
Affiliation:
Dark Sky Observatory, Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA
S. Haque
Affiliation:
Department of Physics, University of the West Indies, St. Augustine, Trinidad&Tobago
the OJ287-15/16 Collaboration
Affiliation:
Department of Physics and Astronomy, University of Turku, Väisäläntie 20, FIN-21500, Kaarina, Finland email: mvaltonen2001@yahoo.com Finnish Centre for Astronomy with ESO, University of Turku, Väisäläntie 20, FIN-21500 Kaarina, Finland Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India Astronomical Institute, The Czech Academy of Sciences, 25165 Ondřejov, Czech Republic Czech Technical University in Prague, Faculty of Electrical Engineering, Prague, Czech Republic Astronomical Observatory, Jagiellonian University, ul. Orla 171, Cracow PL-30-244, Poland Mt. Suhora Astronomical Observatory, Pedagogical University, ul. Podchorazych 2, PL30-084 Cracow, Poland Agenzia Spaziale Italiana (ASI) Space Science Data Center, I-00133 Roma, Italy Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy Astronomical Institute, Osaka Kyoiku University, 4-698 Asahigaoka, Kashiwara, Osaka 582-8582, Japan Herschel Science Centre, ESAC, European Space Agency, 28691 Villanueva de la Cañada, Madrid, Spain Department of Astrophysics, Astronomy and Mechanics, National & Kapodistrian University of Athens, Zografos GR-15784, Athens, Greece Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, Brownlow Hill, L3 5RF, UK Physical Research Laboratory, Ahmedabad 380009, India University of North Carolina at Chapel Hill, Chapel Hill, North Carolina NC 27599, USA Department of Physics, University of the West Indies, St. Augustine, Trinidad&Tobago Kiepenheuer-Institut für Sonnenphysik, D-79104 Freiburg, Germany Dark Sky Observatory, Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA
Corresponding
E-mail address:
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Abstract

Blazar OJ287 exhibits large thermal flares at least twice every 12 years. The times of these flares have been predicted successfully using the model of a quasi-Keplerian eccentric black hole binary where the secondary impacts the accretion disk of the primary, creating the thermal flares. New measurements of the historical light curve have been combined with the observations of the 2015 November/December flare to identify the impact record since year 1886, and to constrain the orbit of the binary. The orbital solution shows that the binary period, now 12.062 years, is decreasing at the rate of 36 days per century. This corresponds to an energy loss to gravitational waves that is 6.5 ± 4 % less than the rate predicted by the standard quadrupolar gravitational wave (GW) emission. We show that the difference is due to higher order gravitational radiation reaction terms that include the dominant order tail contributions.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2019 

References

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High accuracy measurement of gravitational wave back-reaction in the OJ287 black hole binary
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