Orbital variability of the optical linear polarization of the γ-ray binary LS I+61° 303 and new constraints on the orbital parameters

被引：16

作者：

Kravtsov, Vadim ^{[1
,2
]}

Berdyugin, Andrei V. ^{[1
]}

Piirola, Vilppu ^{[1
]}

Kosenkov, Ilia A. ^{[1
,3
]}

Tsygankov, Sergey S. ^{[1
,2
]}

Chernyakova, Maria ^{[4
,5
,6
]}

Malyshev, Denys ^{[7
]}

Sakanoi, Takeshi ^{[8
]}

Kagitani, Masato ^{[8
]}

Berdyugina, Svetlana V. ^{[9
,10
]}

Poutanen, Juri ^{[1
,2
,11
,12
]}

机构：

[1] Univ Turku, Dept Phys & Astron, Turku 20014, Finland

[2] Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84 32, Moscow 117997, Russia

[3] St Petersburg State Univ, Dept Astrophys, Univ Skiy Pr 28, St Petersburg 198504, Russia

[4] Dublin City Univ, Sch Phys Sci, Dublin 9, Ireland

[5] Dublin City Univ, CfAR, Dublin 9, Ireland

[6] Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland

[7] Univ Tubingen, Inst Astron & Astrophys Tubingen, Sand 1, D-72076 Tubingen, Germany

[8] Tohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan

[9] Leibniz Inst Sonnenphys, Schoneckstr 6, D-79104 Freiburg, Germany

[10] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[11] KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, S-10691 Stockholm, Sweden

[12] Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 643卷

基金：

芬兰科学院; 俄罗斯科学基金会;

关键词：

binaries: general; gamma rays: stars; polarization; stars:; emission-line; Be; stars: individual: LS I+61 303; X-RAY; THOMSON SCATTERING; H-ALPHA; CIRCUMSTELLAR ENVELOPES; STARS; LSI+61-DEGREES-303; SECONDARY; EMISSION; SYSTEM; KX;

D O I：

10.1051/0004-6361/202038745

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We studied the variability of the linear polarization and brightness of the gamma-ray binary LS I +61 degrees 303. High-precision BVR photopolarimetric observations were carried out with the Dipol-2 polarimeter on the 2.2 m remotely controlled UH88 telescope at Mauna Kea Observatory and the 60 cm Tohoku telescope at Haleakala bservatory (Hawaii) over 140 nights in 2016-2019. We also determined the degree and angle of the interstellar polarization toward LS I +61 degrees 303 using two out of four nearby field stars that have Gaia's parallaxes. After subtracting the interstellar polarization, we determined the position angle of the intrinsic polarization theta similar or equal to 11 degrees, which can either be associated with the projection of the Be star's decretion disk axis on the plane of sky, or can differ from it by 90 degrees. Using the Lomb-Scargle method, we performed timing analyses and period searches of our polarimetric and photometric data. We found statistically significant periodic variability of the normalized Stokes parameters q and u in all passbands. The most significant period of variability, P-Pol=13.244 +/- 0.012 d, is equal to one half of the orbital period P-orb=26.496 d. The fits of the polarization variability curves with Fourier series show a dominant contribution from the second harmonic which is typical for binary systems with circular orbits and nearly symmetric distribution of light scattering material with respect to the orbital plane. The continuous change of polarization with the orbital phase implies co-planarity of the orbit of the compact object and the Be star's decretion disk. Using a model of Thomson scattering by a cloud that orbits the Be star, we obtained constraints on the orbital parameters, including a small eccentricity e < 0.2 and periastron phase of phi(p) approximate to 0.6, which coincides with the peaks in the radio, X-ray, and TeV emission. These constraints are independent of the assumption about the orientation of the decretion disk plane on the sky. We also extensively discuss the apparent inconsistency with the previous measurements of the orbital parameters from radial velocities. By folding the photometry data acquired during a three-year time span with the orbital period, we found a linear phase shift of the moments of the brightness maximum, confirming the possible existence of superorbital variability.

引用

页数：15

共 64 条

[1] FERMI LAT OBSERVATIONS OF LS I+61°303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe. ;

Charles, E. ;

Chaty, S. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Corbel, S. ;

Corbet, R. ;

Cutini, S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Luca, A. ;

de Palma, F. ;

Digel, S. W. ;

Dormody, M. ;

do Couto e Silva, E. ;

Drell, P. S. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 701 (02) :L123-L128

[2] ASSOCIATING LONG-TERM γ-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61°303 [J].

Ackermann, M. ;

Ajello, M. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bellazzini, R. ;

Bonamente, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Chekhtman, A. ;

Chiang, J. ;

Chiaro, G. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Cutini, S. ;

Dalton, M. ;

D'Ammando, F. ;

de Angelis, A. ;

Den Hartog, P. R. ;

de Palma, F. ;

Dermer, C. D. ;

Digel, S. W. ;

Di Venere, L. ;

Drell, P. S. ;

Dubois, R. ;

Favuzzi, C. ;

Fegan, S. J. ;

Ferrara, E. C. ;

Focke, W. B. ;

Franckowiak, A. ;

Funk, S. ;

Fusco, P. ;

Gargano, F. ;

Gasparrini, D. ;

Germani, S. ;

Giglietto, N. ;

Giordano, F. .

ASTROPHYSICAL JOURNAL LETTERS, 2013, 773 (02)

[3] Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303 [J].

Albert, J. ;

Aliu, E. ;

Anderhub, H. ;

Antoranz, P. ;

Armada, A. ;

Asensio, M. ;

Baixeras, C. ;

Barrio, J. A. ;

Bartelt, M. ;

Bartko, H. ;

Bastieri, D. ;

Bavikadi, S. R. ;

Bednarek, W. ;

Berger, K. ;

Bigongiari, C. ;

Biland, A. ;

Bisesi, E. ;

Bock, R. K. ;

Bordas, P. ;

Bosch-Ramon, V. ;

Bretz, T. ;

Britvitch, I. ;

Camara, M. ;

Carmona, E. ;

Chilingarian, A. ;

Ciprini, S. ;

Coarasa, J. A. ;

Commichau, S. ;

Contreras, J. L. ;

Cortina, J. ;

Curtef, V. ;

Danielyan, V. ;

Dazzi, F. ;

De Angelis, A. ;

Reyes, R. de los ;

De Lotto, B. ;

Domingo-Santamaria, E. ;

Dorner, D. ;

Doro, M. ;

Errando, M. ;

Fagiolini, M. ;

Ferenc, D. ;

Fernandez, E. ;

Firpo, R. ;

Flix, J. ;

Fonseca, M. V. ;

Font, L. ;

Fuchs, M. ;

Galante, N. ;

Garczarczyk, M. .

SCIENCE, 2006, 312 (5781) :1771-1773

[4] THE ORBITS OF THE γ-RAY BINARIES LS I+61 303 AND LS 5039 [J].

Aragona, Christina ;

McSwain, M. Virginia ;

Grundstrom, Erika D. ;

Marsh, Amber N. ;

Roettenbacher, Rachael M. ;

Hessler, Katelyn M. ;

Boyajian, Tabetha S. ;

Ray, Paul S. .

ASTROPHYSICAL JOURNAL, 2009, 698 (01) :514-518

[5] EXCEPTIONALLY BRIGHT TEV FLARES FROM THE BINARY LS I+61° 303 [J].

Archambault, S. ;

Archer, A. ;

Aune, T. ;

Barnacka, A. ;

Benbow, W. ;

Bird, R. ;

Buchovecky, M. ;

Buckley, J. H. ;

Bugaev, V. ;

Byrum, K. ;

Cardenzana, J. V. ;

Cerruti, M. ;

Chen, X. ;

Ciupik, L. ;

Collins-Hughes, E. ;

Connolly, M. P. ;

Cui, W. ;

Dickinson, H. J. ;

Dumm, J. ;

Eisch, J. D. ;

Falcone, A. ;

Feng, Q. ;

Finley, J. P. ;

Fleischhack, H. ;

Flinders, A. ;

Fortin, P. ;

Fortson, L. ;

Furniss, A. ;

Gillanders, G. H. ;

Griffin, S. ;

Grube, J. ;

Gyuk, G. ;

Huetten, M. ;

Hakansson, N. ;

Hanna, D. ;

Holder, J. ;

Humensky, T. B. ;

Johnson, C. A. ;

Kaaret, P. ;

Kar, P. ;

Kelley-Hoskins, N. ;

Kertzman, M. ;

Khassen, Y. ;

Kieda, D. ;

Krause, M. ;

Krennrich, F. ;

Kumar, S. ;

Lang, M. J. ;

Maier, G. ;

McArthur, S. .

ASTROPHYSICAL JOURNAL LETTERS, 2016, 817 (01)

[6] POLARIMETRIC ACCURACY REQUIRED FOR THE DETERMINATION OF BINARY INCLINATIONS [J].

ASPIN, C ;

SIMMONS, JFL ;

BROWN, JC .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1981, 194 (01) :283-291

[7] Assessing the statistical significance of periodogram peaks [J].

Baluev, R. V. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2008, 385 (03) :1279-1285

[8]

Berdyugin AV, 1998, ASTRON LETT+, V24, P111

[9] Gaia Data Release 2. Summary of the contents and survey properties [J].

Brown, A. G. A. ;

Vallenari, A. ;

Prusti, T. ;

de Bruijne, J. H. J. ;

Babusiaux, C. ;

Bailer-Jones, C. A. L. ;

Biermann, M. ;

Evans, D. W. ;

Eyer, L. ;

Jansen, F. ;

Jordi, C. ;

Klioner, S. A. ;

Lammers, U. ;

Lindegren, L. ;

Luri, X. ;

Mignard, F. ;

Panem, C. ;

Pourbaix, D. ;

Randich, S. ;

Sartoretti, P. ;

Siddiqui, H. I. ;

Soubiran, C. ;

van Leeuwen, F. ;

Walton, N. A. ;

Arenou, F. ;

Bastian, U. ;

Cropper, M. ;

Drimmel, R. ;

Katz, D. ;

Lattanzi, M. G. ;

Bakker, J. ;

Cacciari, C. ;

Castaneda, J. ;

Chaoul, L. ;

Cheek, N. ;

De Angeli, F. ;

Fabricius, C. ;

Guerra, R. ;

Holl, B. ;

Masana, E. ;

Messineo, R. ;

Mowlavi, N. ;

Nienartowicz, K. ;

Panuzzo, P. ;

Portell, J. ;

Riello, M. ;

Seabroke, G. M. ;

Tanga, P. ;

Thevenin, F. ;

Gracia-Abril, G. .

ASTRONOMY & ASTROPHYSICS, 2018, 616

[10] THE EFFECT OF ORBITAL ECCENTRICITY ON POLARIMETRIC BINARY DIAGNOSTICS [J].

BROWN, JC ;

ASPIN, C ;

SIMMONS, JFL ;

MCLEAN, IS .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1982, 198 (03) :787-794

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