21 year timing of the black-widow pulsar J2051-0827

Shaifullah, G.G.ShaifullahVerbiest, J. P. W.J. P. W.VerbiestFreire, P. C. C.P. C. C.FreireTauris, T. M.T. M.TaurisWex, N.N.WexOsłowski, S.S.OsłowskiStappers, B. W.B. W.StappersBassa, C. G.C. G.BassaCaballero, R. N.R. N.CaballeroChampion, D. J.D. J.ChampionCognard, I.I.CognardDesvignes, G.G.DesvignesGraikou, E.E.GraikouGuillemot, L.L.GuillemotJanssen, G. H.G. H.JanssenJessner, A.A.JessnerJordan, C.C.JordanKaruppusamy, R.R.KaruppusamyKramer, M.M.KramerLazaridis, K.K.LazaridisLazarus, P.P.LazarusLyne, A. G.A. G.LyneMcKee, J. W.J. W.McKeePERRODIN, DELPHINEDELPHINEPERRODIN0000-0002-1806-2483POSSENTI, ANDREAANDREAPOSSENTI0000-0001-5902-3731Tiburzi, C.C.Tiburzi2020-04-302020-04-3020160035-8711http://hdl.handle.net/20.500.12386/24370Timing results for the black-widow pulsar J2051-0827 are presented, using a 21 year data set from four European Pulsar Timing Array telescopes and the Parkes radio telescope. This data set, which is the longest published to date for a black-widow system, allows for an improved analysis that addresses previously unknown biases. While secular variations, as identified in previous analyses, are recovered, short-term variations are detected for the first time. Concurrently, a significant decrease of ∼ 2.5 × 10<SUP>- 3</SUP> cm<SUP>- 3</SUP> pc in the dispersion measure associated with PSR J2051-0827 is measured for the first time and improvements are also made to estimates of the proper motion. Finally, PSR J2051-0827 is shown to have entered a relatively stable state suggesting the possibility of its eventual inclusion in pulsar timing arrays.STAMPAen21 year timing of the black-widow pulsar J2051-0827Article10.1093/mnras/stw17372-s2.0-84988719640000383516700105https://academic.oup.com/mnras/article/462/1/1029/2589997https://arxiv.org/pdf/1607.04167.pdf2016MNRAS.462.1029SFIS/05 - ASTRONOMIA E ASTROFISICAScienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems