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Journal Articles The Astrophysical journal letters Year : 2013

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

Markus Ackermann , Marco Ajello , Jean Ballet (1) , Guido Barbiellini , D. Bastieri , R. Bellazzini , E. Bonamente , T. J. Brandt (2) , J. Bregeon , M. Brigida , Pascal Bruel (3) , R. Buehler , S. Buson , G. A. Caliandro , R. A. Cameron , P. A. Caraveo , J. M. Casandjian (1) , 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 (3) , E. C. Ferrara , W. B. Focke , A. Franckowiak , S. Funk , P. Fusco (4) , F. Gargano (4) , D. Gasparrini , S. Germani , N. Giglietto , F. Giordano , M. Giroletti , T. Glanzman , G. Godfrey , I. A. Grenier (1) , S. Guiriec , D. Hadasch (5) , Y. Hanabata , A. K. Harding , M. Hayashida , E. Hays , A. B. Hill (6) , D. Horan (3) , 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 (7) , 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 (8) , T. Ohsugi , A. Okumura , M. Orienti , E. Orlando , J. F. Ormes , D. Paneque , A. Papitto , J. S. Perkins , M. Pesce-Rollins , F. Piron (8) , 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 (8) , G. Vianello , V. Vitale , M. Werner , B. L. Winer , K. S. Wood
Markus Ackermann
  • Function : Author
Marco Ajello
  • Function : Author
Guido Barbiellini
  • Function : Author
D. Bastieri
  • Function : Author
R. Bellazzini
  • Function : Author
E. Bonamente
  • Function : Author
J. Bregeon
M. Brigida
  • Function : Author
R. Buehler
  • Function : Author
S. Buson
  • Function : Author
G. A. Caliandro
  • Function : Author
R. A. Cameron
  • Function : Author
P. A. Caraveo
  • Function : Author
E. Cavazzuti
  • Function : Author
C. Cecchi
  • Function : Author
A. Chekhtman
  • Function : Author
J. Chiang
  • Function : Author
G. Chiaro
  • Function : Author
S. Ciprini
  • Function : Author
R. Claus
  • Function : Author
J. Cohen-Tanugi
L. R. Cominsky
  • Function : Author
J. Conrad
  • Function : Author
S. Cutini
  • Function : Author
M. Dalton
  • Function : Author
F. d'Ammando
  • Function : Author
A. de Angelis
  • Function : Author
P. R. den Hartog
  • Function : Author
F. de Palma
  • Function : Author
C. D. Dermer
  • Function : Author
S. W. Digel
  • Function : Author
L. Di Venere
P. S. Drell
  • Function : Author
R. Dubois
  • Function : Author
C. Favuzzi
  • Function : Author
S. J. Fegan
E. C. Ferrara
  • Function : Author
W. B. Focke
  • Function : Author
A. Franckowiak
  • Function : Author
S. Funk
  • Function : Author
D. Gasparrini
  • Function : Author
S. Germani
  • Function : Author
N. Giglietto
F. Giordano
  • Function : Author
M. Giroletti
  • Function : Author
T. Glanzman
  • Function : Author
G. Godfrey
  • Function : Author
S. Guiriec
  • Function : Author
D. Hadasch
Y. Hanabata
  • Function : Author
A. K. Harding
  • Function : Author
M. Hayashida
  • Function : Author
E. Hays
  • Function : Author
R. E. Hughes
  • Function : Author
T. Jogler
  • Function : Author
G. J ́ohannesson
  • Function : Author
A.S. Johnson
  • Function : Author
T. J. Johnson
  • Function : Author
T. Kawano
M. Kerr
  • Function : Author
J. Kn ̈odlseder
  • Function : Author
M. Kuss
  • Function : Author
J. Lande
  • Function : Author
S. Larsson
  • Function : Author
L. Latronico
  • Function : Author
M. Lemoine-Goumard
J. Li
  • Function : Author
F. Longo
M. N. Lovellette
  • Function : Author
P. Lubrano
  • Function : Author
M. Mayer
  • Function : Author
M. N. Mazziotta
  • Function : Author
J. E. Mcenery
  • Function : Author
P. F. Michelson
  • Function : Author
T. Mizuno
  • Function : Author
M. E. Monzani
  • Function : Author
A. Morselli
  • Function : Author
I. V. Moskalenko
  • Function : Author
S. Murgia
  • Function : Author
R. Nemmen
  • Function : Author
T. Ohsugi
  • Function : Author
A. Okumura
  • Function : Author
M. Orienti
  • Function : Author
E. Orlando
  • Function : Author
J. F. Ormes
  • Function : Author
D. Paneque
A. Papitto
  • Function : Author
J. S. Perkins
  • Function : Author
M. Pesce-Rollins
G. Pivato
  • Function : Author
S. Rain'O
  • Function : Author
R. Rando
  • Function : Author
M. Razzano
  • Function : Author
N. Rea
  • Function : Author
A. Reimer
O. Reimer
  • Function : Author
J. D. Scargle
  • Function : Author
A. Schulz
  • Function : Author
C. Sgr'O
  • Function : Author
E. J. Siskind
  • Function : Author
G. Spandre
  • Function : Author
P. Spinelli
  • Function : Author
H. Takahashi
  • Function : Author
J. G. Thayer
  • Function : Author
J. B. Thayer
  • Function : Author
M. Tinivella
  • Function : Author
D. F. Torres
  • Function : Author
G. Tosti
  • Function : Author
E. Troja
  • Function : Author
Y. Uchiyama
  • Function : Author
T. L. Usher
  • Function : Author
J. Vandenbroucke
  • Function : Author
G. Vianello
  • Function : Author
V. Vitale
M. Werner
B. L. Winer
  • Function : Author
K. S. Wood
  • Function : Author

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.

Dates and versions

in2p3-00915658 , version 1 (09-12-2013)

Identifiers

Cite

Markus Ackermann, Marco Ajello, Jean Ballet, Guido Barbiellini, D. Bastieri, et al.. Associating long-term γ-ray variability with the superorbital period of LS I + 61◦ 303. The Astrophysical journal letters, 2013, 773, pp.L35. ⟨10.1088/2041-8205/773/2/L35⟩. ⟨in2p3-00915658⟩
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