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Precision Orbital Dynamics from Interstellar Scintillation Arcs for PSR J0437-4715
Reardon, Daniel J.1,2; Coles, William A.3; Bailes, Matthew1,2; Bhat, N. D. Ramesh4; Dai, Shi5; Hobbs, George B.2,5; Kerr, Matthew6; Manchester, Richard N.5; Oslowski, Stefan1; Parthasarathy, Aditya1,2; Russell, Christopher J.7; Shannon, Ryan M.1,2; Spiewak, Renee1,2; Toomey, Lawrence5; Tuntsov, Artem V.8; van Straten, Willem9; Walker, Mark A.8; Wang, Jingbo10; Zhang, Lei5,11,12; Zhu, Xing-Jiang2,13
Contribution Rank10
AbstractIntensity scintillations of radio pulsars are known to originate from interference between waves scattered by the electron density irregularities of interstellar plasma, often leading to parabolic arcs in the two-dimensional power spectrum of the recorded dynamic spectrum. The degree of arc curvature depends on the distance to the scattering plasma and its transverse velocity with respect to the line of sight. We report the observation of annual and orbital variations in the curvature of scintillation arcs over a period of 16 yr for the bright millisecond pulsar, PSR J0437-4715. These variations are the signature of the relative transverse motions of Earth, the pulsar, and the scattering medium, which we model to obtain precise measurements of parameters of the pulsar's binary orbit and the scattering medium itself. We observe two clear scintillation arcs in most of our >5000 observations, and we show that they originate from scattering by thin screens located at distances D-1 = 89.8 0.4 pc and D-2 = 124 3 pc from Earth. The best-fit scattering model we derive for the brightest arc yields the pulsar's orbital inclination angle, i = 1371 03, and longitude of ascending node, omega = 2063 04. Using scintillation arcs for precise astrometry and orbital dynamics can be superior to modeling variations in the diffractive scintillation timescale, because the arc curvature is independent of variations in the level of turbulence of interstellar plasma. This technique can be used in combination with pulsar timing to determine the full three-dimensional orbital geometries of binary pulsars and provides parameters essential for testing theories of gravity and constraining neutron star masses.
KeywordPulsars Millisecond pulsars Interstellar medium Interstellar plasma Binary pulsars Radio pulsars Interstellar scintillation Radio astronomy Orbital motion Astrometry Orbits Orbit determination
Indexed BySCI
Funding ProjectCommonwealth Government ; Australian Research Council[FL150100148] ; Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav)[CE170100004] ; NASA
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000592344300001
Funding OrganizationCommonwealth Government ; Australian Research Council ; Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav) ; NASA
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorReardon, Daniel J.
Affiliation1.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia
2.Australian Res Council, Ctr Excellence Gravitat Wave Discovery OzGrav, Canberra, ACT, Australia
3.Univ Calif San Diego, Elect & Comp Engn, La Jolla, CA USA
4.Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia
5.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
6.Naval Res Lab, Space Sci Div, Washington, DC 20375 USA
7.CSIRO Sci Comp Serv, Australian Technol Pk,Locked Bag 9013, Alexandria, NSW 1435, Australia
8.Manly Astrophys, 15-41-42 East Esplanade, Manly, NSW 2095, Australia
9.Auckland Univ Technol, Inst Radio Astron & Space Res, Private Bag 92006, Auckland 1142, New Zealand
10.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
11.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100101, Peoples R China
12.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
13.Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia
Recommended Citation
GB/T 7714
Reardon, Daniel J.,Coles, William A.,Bailes, Matthew,et al. Precision Orbital Dynamics from Interstellar Scintillation Arcs for PSR J0437-4715[J]. ASTROPHYSICAL JOURNAL,2020,904(2):104.
APA Reardon, Daniel J..,Coles, William A..,Bailes, Matthew.,Bhat, N. D. Ramesh.,Dai, Shi.,...&Zhu, Xing-Jiang.(2020).Precision Orbital Dynamics from Interstellar Scintillation Arcs for PSR J0437-4715.ASTROPHYSICAL JOURNAL,904(2),104.
MLA Reardon, Daniel J.,et al."Precision Orbital Dynamics from Interstellar Scintillation Arcs for PSR J0437-4715".ASTROPHYSICAL JOURNAL 904.2(2020):104.
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