The MPIfR-MeerKAT Galactic Plane Survey II. The eccentric double neutron star system PSRJ1208-5936 and a neutron star merger rate update

被引：13

作者：

Colom i Bernadich, M. ^{[1
]}

Balakrishnan, V. ^{[1
]}

Barr, E. ^{[1
]}

Berezina, M. ^{[1
,2
]}

Burgay, M. ^{[3
]}

Buchner, S. ^{[4
]}

Champion, D. J. ^{[1
]}

Chen, W. ^{[1
]}

Desvignes, G. ^{[1
]}

Freire, P. C. C. ^{[1
]}

Grunthal, K. ^{[1
]}

Kramer, M. ^{[1
]}

Men, Y. ^{[1
]}

Padmanabh, P. V. ^{[1
,5
,6
]}

Parthasarathy, A. ^{[1
]}

Pillay, D. ^{[1
]}

Rammala, I. ^{[1
]}

Sengupta, S. ^{[1
]}

Venkatraman Krishnan, V. ^{[1
]}

机构：

[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[2] Heidelberg Univ, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany

[3] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[4] South African Radio Astron Observ, 2 Fir St,Black River Pk, ZA-7925 Observatory, South Africa

[5] Max Planck Inst Gravitat Phys, Albert Einstein Inst, Callinstr 38, D-30167 Hannover, Germany

[6] Leibniz Univ Hannover, Welfengarten 1, D-30167 Hannover, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 678卷

基金：

欧洲研究理事会;

关键词：

binaries: close; ephemerides; gravitational waves; stars: neutron; celestial mechanics; stars: fundamental parameters; CELESTIAL CAP PULSAR; RELATIVISTIC GRAVITY; GENERAL-RELATIVITY; RADIO PULSAR; COALESCENCE RATES; ELECTRON-DENSITY; TIMING PACKAGE; BINARY PULSARS; PSR J1756-2251; DISCOVERY;

D O I：

10.1051/0004-6361/202346953

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The MPIfR-MeerKAT Galactic Plane survey at L-band (MMGPS-L) is the most sensitive pulsar survey in the Southern Hemisphere, providing 78 discoveries in an area of 900 sq. deg. Here, we present a follow-up study of one of these new discoveries, PSR J1208-5936, a 28.71-ms recycled pulsar in a double neutron star system with an orbital period of P-b = 0.632 days and an eccentricity of e = 0.348, merging within the Hubble time. Through timing of almost one year of observations, we detected the relativistic advance of periastron ((omega) over dot = 0.918(1) deg yr(-1)), resulting in a total system mass of M-t = 2.586(5) M-circle star. We also achieved low-significance constraints on the amplitude of the Einstein delay and Shapiro delay, in turn yielding constraints on the pulsar mass (M-p = 1.26(-0.25)(+0.13)M(circle star)), the companion mass (Mc = 1.32(-0.13)(+0.25)M(circle star)), and the inclination angle (i = 57 +/- 12 degrees). This system is highly eccentric compared to other Galactic field double neutron stars with similar periods, possibly hinting at a larger-than-usual supernova kick during the formation of the second-born neutron star. The binary will merge within 7.2(2) Gyr due to the emission of gravitational waves, making it a progenitor of the neutron star merger events seen by ground-based gravitational wave observatories. With the improved sensitivity of the MMGPS-L, we updated the Milky Way neutron star merger rate to be R-MW(new)= 25(-9)(+19) Myr(-1) within 90% credible intervals, which is lower than previous studies based on known Galactic binaries owing to the lack of further detections despite the highly sensitive nature of the survey. This implies a local cosmic neutron star merger rate of R-local(new) = 293(-103)(+222) Gpc(-3) yr(-1), which is consistent with LIGO and Virgo O3 observations. With this, we also predict the observation of 10(-4)(+8) neutron star merger events during the LIGO-Virgo-KAGRA O4 run. We predict the uncertainties on the component masses and the inclination angle will be reduced to 5 x 10(-3) M-circle star and 0.4 degrees after two decades of timing, and that in at least a decade from now the detection of (P) over dot(b) and the sky proper motion will serve to make an independent constraint of the distance to the system.

引用

页数：18

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