Details

Autor(en) / Beteiligte

• Cameron, A D
• Champion, D J
• Kramer, M
• Bailes, M
• Barr, E D
• Bassa, C G
• Bhandari, S
• Bhat, N D R
• Burgay, M
• Burke-Spolaor, S
• Eatough, R P
• Flynn, C M L
• Freire, P C C
• Jameson, A
• Johnston, S
• Karuppusamy, R
• Keith, M J
• Levin, L
• Lorimer, D R
• Lyne, A G
• McLaughlin, M A
• Ng, C
• Petroff, E
• Possenti, A
• Ridolfi, A
• Stappers, B W
• van Straten, W
• Tauris, T M
• Tiburzi, C
• Wex, N

Titel

The High Time Resolution Universe Pulsar Survey – XIII. PSR J1757−1854, the most accelerated binary pulsar

Ist Teil von

• Monthly notices of the Royal Astronomical Society. Letters, 2018-03, Vol.475 (1), p.L57-L61

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract We report the discovery of PSR J1757−1854, a 21.5-ms pulsar in a highly-eccentric, 4.4-h orbit with a neutron star (NS) companion. PSR J1757−1854 exhibits some of the most extreme relativistic parameters of any known pulsar, including the strongest relativistic effects due to gravitational-wave damping, with a merger time of 76 Myr. Following a 1.6-yr timing campaign, we have measured five post-Keplerian parameters, yielding the two component masses (mp = 1.3384(9) M⊙ and mc = 1.3946(9) M⊙) plus three tests of general relativity, which the theory passes. The larger mass of the NS companion provides important clues regarding the binary formation of PSR J1757−1854. With simulations suggesting 3-σ measurements of both the contribution of Lense–Thirring precession to the rate of change of the semimajor axis and the relativistic deformation of the orbit within ∼7–9 yr, PSR J1757−1854 stands out as a unique laboratory for new tests of gravitational theories.