Associating long-term γ-ray variability with the superorbital period of LS I + 61◦ 303

Markus Ackermann; Marco Ajello; Jean Ballet; Guido Barbiellini; D. Bastieri; R. Bellazzini; E. Bonamente; T. J. Brandt; J. Bregeon; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; A. Chekhtman; J. Chiang; G. Chiaro; S. Ciprini; R. Claus; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; S. Cutini; M. Dalton; F. d'Ammando; A. de Angelis; P. R. den Hartog; F. de Palma; C. D. Dermer; S. W. Digel; L. Di Venere; P. S. Drell; R. Dubois; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; A. Franckowiak; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; M. Hayashida; E. Hays; A. B. Hill; D. Horan; R. E. Hughes; T. Jogler; G. J ́ohannesson; A.S. Johnson; T. J. Johnson; T. Kawano; M. Kerr; J. Kn ̈odlseder; M. Kuss; J. Lande; S. Larsson; L. Latronico; M. Lemoine-Goumard; J. Li; F. Longo; M. N. Lovellette; P. Lubrano; M. Mayer; M. N. Mazziotta; J. E. Mcenery; P. F. Michelson; T. Mizuno; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; A. Okumura; M. Orienti; E. Orlando; J. F. Ormes; D. Paneque; A. Papitto; J. S. Perkins; M. Pesce-Rollins; F. Piron; G. Pivato; S. Rain'O; R. Rando; M. Razzano; N. Rea; A. Reimer; O. Reimer; J. D. Scargle; A. Schulz; C. Sgr'O; E. J. Siskind; G. Spandre; P. Spinelli; H. Takahashi; J. G. Thayer; J. B. Thayer; M. Tinivella; D. F. Torres; G. Tosti; E. Troja; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; M. Werner; B. L. Winer; K. S. Wood

doi:10.1088/2041-8205/773/2/L35

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Associating long-term γ-ray variability with the superorbital period of LS I + 61◦ 303

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Associating long-term γ-ray variability with the superorbital period of LS I + 61◦ 303

Markus Ackermann, Marco Ajello, Jean Ballet, Guido Barbiellini, D. Bastieri, R. Bellazzini, E. Bonamente, T. J. Brandt, J. Bregeon, M. Brigida, …

The Astrophysical Journal Letters, Vol.773

2013

DOI: https://doi.org/10.1088/2041-8205/773/2/L35

Abstract

Gamma-ray binaries are stellar systems for which the spectral ene rgy distribu- tion (discounting the thermal stellar emission) peaks at high energie s. Detected from radio to TeV gamma rays, the γ -ray binary LS I +61 ◦ 303 is highly variable across all frequencies. One aspect of this system's variability is the modula- tion of its emission with the timescale set by the ∼ 26 . 4960-day orbital period. Here we show that, during the time of our observations, the γ -ray emission of LS I +61 ◦ 303 also presents a sinusoidal variability consistent with the previou sly- known superorbital period of 1667 days. This modulation is more pro minently seen at orbital phases around apastron, whereas it does not intr oduce a visible change close to periastron. It is also found in the appearance and d isappearance of variability at the orbital period in the power spectrum of the data . This be- havior could be explained by a quasi-cyclical evolution of the equator ial outflow of the Be companion star, whose features influence the conditions for generating gamma rays. These findings open the possibility to use γ -ray observations to study the outflows of massive stars in eccentric binary systems.

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Title: Associating long-term γ-ray variability with the superorbital period of LS I + 61◦ 303
Creators - without role: Markus Ackermann - Deutsches Elektronen-Synchrotron DESY
Marco Ajello - University of California, Berkeley
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bonamente - University of Perugia
T. J. Brandt - Institut de Recherche en Astrophysique et Planétologie
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
S. Buson - University of Padua
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Astrophysique Interprétation Modélisation
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
A. Chekhtman - George Mason University
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
G. Chiaro - University of Padua
S. Ciprini - Astronomical Observatory of Rome
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire Univers et Particules de Montpellier
L. R. Cominsky
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
M. Dalton - Laboratoire de Physique des deux infinis Bordeaux
F. d'Ammando
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
P. R. den Hartog
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
C. D. Dermer
S. W. Digel
L. Di Venere - Kavli Institute for Particle Astrophysics and Cosmology
P. S. Drell
R. Dubois - SLAC National Accelerator Laboratory
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara
W. B. Focke
A. Franckowiak - Kavli Institute for Particle Astrophysics and Cosmology
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - Astrophysique Interprétation Modélisation
S. Guiriec - Goddard Space Flight Center
D. Hadasch - Institute of Space Sciences
Y. Hanabata - Hiroshima University
A. K. Harding
M. Hayashida - Stanford University
E. Hays - Goddard Space Flight Center
A. B. Hill - Institut de Planétologie et d'Astrophysique de Grenoble
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes
T. Jogler - Stanford University
G. J ́ohannesson
A.S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Johnson
T. Kawano - Hiroshima University
M. Kerr - Kavli Institute for Particle Astrophysics and Cosmology
J. Kn ̈odlseder
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - AlbaNova
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
M. Lemoine-Goumard - Institut National de Physique Nucléaire et de Physique des Particules
J. Li - Institute of High Energy Physics
F. Longo - University of Trieste
M. N. Lovellette
P. Lubrano - University of Perugia
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M. N. Mazziotta
J. E. Mcenery
P. F. Michelson
T. Mizuno - Hiroshima University
M. E. Monzani
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
R. Nemmen - Goddard Space Flight Center
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
A. Okumura - Stanford University
M. Orienti - Istituto di Radioastronomia di Bologna
E. Orlando - Kavli Institute for Particle Astrophysics and Cosmology
J. F. Ormes
D. Paneque - Max Planck Institute for Physics
A. Papitto - Institute of Space Sciences
J. S. Perkins
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
S. Rain'O
R. Rando - University of Padua
M. Razzano - University of California, Santa Cruz
N. Rea - Institute of Space Sciences
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
J. D. Scargle
A. Schulz - Deutsches Elektronen-Synchrotron DESY
C. Sgr'O
E. J. Siskind
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
H. Takahashi - Hiroshima University
J. G. Thayer
J. B. Thayer
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
E. Troja - Goddard Space Flight Center
Y. Uchiyama
T. L. Usher
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Consorzio Interuniversitario Fisica Spaziale
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
M. Werner - Universität Innsbruck
B. L. Winer
K. S. Wood
Publication Details: The Astrophysical Journal Letters, Vol.773
Identifiers: 9938980409311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00915658