From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release
We analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release. We use Bayesian methodology, performing model selection to determine the optimal description of the stochastic signals present in each pulsar. In addition to spin-noi...
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| Format: | Journal Article |
| Published: |
Oxford University Press
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/20343 |
| _version_ | 1848750279400357888 |
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| author | Lentati, L. Shannon, Ryan Coles, W. Verbiest, J. van Haasteren, R. Ellis, J. Caballero, R. Manchester, R. Arzoumanian, Z. Babak, S. Bassa, C. Bhat, N. Brem, P. Burgay, M. Burke-Spolaor, S. Champion, D. Chatterjee, S. Cognard, I. Cordes, J. Dai, S. Demorest, P. Desvignes, G. Dolch, T. Ferdman, R. Fonseca, E. Gair, J. Gonzalez, M. Graikou, E. Guillemot, L. Hessels, J. Hobbs, G. Janssen, G. Jones, G. Karuppusamy, R. Keith, M. Kerr, M. Kramer, M. Lam, M. Lasky, P. Lassus, A. Lazarus, P. Lazio, T. Lee, K. Levin, L. Liu, K. Lynch, R. Madison, D. McKee, J. McLaughlin, M. McWilliams, S. Mingarelli, C. Nice, D. Oslowski, S. Pennucci, T. Perera, B. Perrodin, D. Petiteau, A. Possenti, A. Ransom, S. Reardon, D. Rosado, P. Sanidas, S. Sesana, A. Shaifullah, G. Siemens, X. Smits, R. Stairs, I. Stappers, B. Stinebring, D. Stovall, K. Swiggum, J. Taylor, S. Theureau, G. Tiburzi, C. Toomey, L. Vallisneri, M. van Straten, W. Vecchio, A. Wang, J. Wang, Y. You, X. Zhu, W. Zhu, X. |
| author_facet | Lentati, L. Shannon, Ryan Coles, W. Verbiest, J. van Haasteren, R. Ellis, J. Caballero, R. Manchester, R. Arzoumanian, Z. Babak, S. Bassa, C. Bhat, N. Brem, P. Burgay, M. Burke-Spolaor, S. Champion, D. Chatterjee, S. Cognard, I. Cordes, J. Dai, S. Demorest, P. Desvignes, G. Dolch, T. Ferdman, R. Fonseca, E. Gair, J. Gonzalez, M. Graikou, E. Guillemot, L. Hessels, J. Hobbs, G. Janssen, G. Jones, G. Karuppusamy, R. Keith, M. Kerr, M. Kramer, M. Lam, M. Lasky, P. Lassus, A. Lazarus, P. Lazio, T. Lee, K. Levin, L. Liu, K. Lynch, R. Madison, D. McKee, J. McLaughlin, M. McWilliams, S. Mingarelli, C. Nice, D. Oslowski, S. Pennucci, T. Perera, B. Perrodin, D. Petiteau, A. Possenti, A. Ransom, S. Reardon, D. Rosado, P. Sanidas, S. Sesana, A. Shaifullah, G. Siemens, X. Smits, R. Stairs, I. Stappers, B. Stinebring, D. Stovall, K. Swiggum, J. Taylor, S. Theureau, G. Tiburzi, C. Toomey, L. Vallisneri, M. van Straten, W. Vecchio, A. Wang, J. Wang, Y. You, X. Zhu, W. Zhu, X. |
| author_sort | Lentati, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release. We use Bayesian methodology, performing model selection to determine the optimal description of the stochastic signals present in each pulsar. In addition to spin-noise and dispersion-measure (DM) variations, these models can include timing noise unique to a single observing system, or frequency band. We show the improved radio-frequency coverage and presence of overlapping data from different observing systems in the IPTA data set enables us to separate both system and band-dependent effects with much greater efficacy than in the individual pulsar timing array (PTA) data sets. For example, we show that PSR J1643-1224 has, in addition to DM variations, significant band-dependent noise that is coherent between PTAs which we interpret as coming from time-variable scattering or refraction in the ionized interstellar medium. Failing to model these different contributions appropriately can dramatically alter the astrophysical interpretation of the stochastic signals observed in the residuals. In some cases, the spectral exponent of the spin-noise signal can vary from 1.6 to 4 depending upon the model, which has direct implications for the long-term sensitivity of the pulsar to a stochastic gravitational-wave (GW) background. By using a more appropriate model, however, we can greatly improve a pulsar's sensitivity to GWs. For example, including system and band-dependent signals in the PSR J0437-4715 data set improves the upper limit on a fiducial GW background by ~60 per cent compared to a model that includes DM variations and spin-noise only. |
| first_indexed | 2025-11-14T07:34:18Z |
| format | Journal Article |
| id | curtin-20.500.11937-20343 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:34:18Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-203432018-03-29T09:06:34Z From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release Lentati, L. Shannon, Ryan Coles, W. Verbiest, J. van Haasteren, R. Ellis, J. Caballero, R. Manchester, R. Arzoumanian, Z. Babak, S. Bassa, C. Bhat, N. Brem, P. Burgay, M. Burke-Spolaor, S. Champion, D. Chatterjee, S. Cognard, I. Cordes, J. Dai, S. Demorest, P. Desvignes, G. Dolch, T. Ferdman, R. Fonseca, E. Gair, J. Gonzalez, M. Graikou, E. Guillemot, L. Hessels, J. Hobbs, G. Janssen, G. Jones, G. Karuppusamy, R. Keith, M. Kerr, M. Kramer, M. Lam, M. Lasky, P. Lassus, A. Lazarus, P. Lazio, T. Lee, K. Levin, L. Liu, K. Lynch, R. Madison, D. McKee, J. McLaughlin, M. McWilliams, S. Mingarelli, C. Nice, D. Oslowski, S. Pennucci, T. Perera, B. Perrodin, D. Petiteau, A. Possenti, A. Ransom, S. Reardon, D. Rosado, P. Sanidas, S. Sesana, A. Shaifullah, G. Siemens, X. Smits, R. Stairs, I. Stappers, B. Stinebring, D. Stovall, K. Swiggum, J. Taylor, S. Theureau, G. Tiburzi, C. Toomey, L. Vallisneri, M. van Straten, W. Vecchio, A. Wang, J. Wang, Y. You, X. Zhu, W. Zhu, X. We analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release. We use Bayesian methodology, performing model selection to determine the optimal description of the stochastic signals present in each pulsar. In addition to spin-noise and dispersion-measure (DM) variations, these models can include timing noise unique to a single observing system, or frequency band. We show the improved radio-frequency coverage and presence of overlapping data from different observing systems in the IPTA data set enables us to separate both system and band-dependent effects with much greater efficacy than in the individual pulsar timing array (PTA) data sets. For example, we show that PSR J1643-1224 has, in addition to DM variations, significant band-dependent noise that is coherent between PTAs which we interpret as coming from time-variable scattering or refraction in the ionized interstellar medium. Failing to model these different contributions appropriately can dramatically alter the astrophysical interpretation of the stochastic signals observed in the residuals. In some cases, the spectral exponent of the spin-noise signal can vary from 1.6 to 4 depending upon the model, which has direct implications for the long-term sensitivity of the pulsar to a stochastic gravitational-wave (GW) background. By using a more appropriate model, however, we can greatly improve a pulsar's sensitivity to GWs. For example, including system and band-dependent signals in the PSR J0437-4715 data set improves the upper limit on a fiducial GW background by ~60 per cent compared to a model that includes DM variations and spin-noise only. 2016 Journal Article http://hdl.handle.net/20.500.11937/20343 10.1093/mnras/stw395 Oxford University Press restricted |
| spellingShingle | Lentati, L. Shannon, Ryan Coles, W. Verbiest, J. van Haasteren, R. Ellis, J. Caballero, R. Manchester, R. Arzoumanian, Z. Babak, S. Bassa, C. Bhat, N. Brem, P. Burgay, M. Burke-Spolaor, S. Champion, D. Chatterjee, S. Cognard, I. Cordes, J. Dai, S. Demorest, P. Desvignes, G. Dolch, T. Ferdman, R. Fonseca, E. Gair, J. Gonzalez, M. Graikou, E. Guillemot, L. Hessels, J. Hobbs, G. Janssen, G. Jones, G. Karuppusamy, R. Keith, M. Kerr, M. Kramer, M. Lam, M. Lasky, P. Lassus, A. Lazarus, P. Lazio, T. Lee, K. Levin, L. Liu, K. Lynch, R. Madison, D. McKee, J. McLaughlin, M. McWilliams, S. Mingarelli, C. Nice, D. Oslowski, S. Pennucci, T. Perera, B. Perrodin, D. Petiteau, A. Possenti, A. Ransom, S. Reardon, D. Rosado, P. Sanidas, S. Sesana, A. Shaifullah, G. Siemens, X. Smits, R. Stairs, I. Stappers, B. Stinebring, D. Stovall, K. Swiggum, J. Taylor, S. Theureau, G. Tiburzi, C. Toomey, L. Vallisneri, M. van Straten, W. Vecchio, A. Wang, J. Wang, Y. You, X. Zhu, W. Zhu, X. From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title | From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title_full | From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title_fullStr | From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title_full_unstemmed | From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title_short | From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release |
| title_sort | from spin noise to systematics: stochastic processes in the first international pulsar timing array data release |
| url | http://hdl.handle.net/20.500.11937/20343 |