التفاصيل البيبلوغرافية
| العنوان: |
Modeling the Uncertainties of Solar System Ephemerides for Robust Gravitational-wave Searches with Pulsar-timing Arrays |
| المؤلفون: |
Vallisneri, M., Taylor, S. R., Simon, J., Folkner, W. M., Park, R. S., Cutler, C., Ellis, J. A., Lazio, T. J. W., Vigeland, S. J., Aggarwal, K., Arzoumanian, Z., Baker, P. T., Brazier, A., Brook, P. R., Burke-Spolaor, S., Chatterjee, S., Cordes, J. M., Cornish, N. J., Crawford, F., Cromartie, H. T., Crowter, K., DeCesar, M., Demorest, P. B., Dolch, T., Ferdman, R. D., Ferrara, E. C., Fonseca, E., Garver-Daniels, N., Gentile, P., Good, D., Hazboun, J. S., Holgado, A. M., Huerta, E. A., Islo, K., Jennings, R., Jones, G. C., Jones, M. L., Kaplan, D. L., Kelley, L. Z., Key, J. S., Lam, M. T., Levin, L., Lorimer, D. R., Luo, J., Lynch, R. S., Madison, D. R., McLaughlin, M. A., McWilliams, S. T., Mingarelli, C. M. F., Ng, C., Nice, D. J., Pennucci, T. T., Pol, N. S., Ransom, S. M., Ray, P. S., Siemens, X., Spiewak, R., Stairs, I. H., Stinebring, D. R., Stovall, K., Swiggum, J. K., van Haasteren, R., Witt, C. A., Zhu, W. W. |
| المصدر: |
Astrophysical Journal, 893(2), Art. No. 112, (2020-04-20) |
| بيانات النشر: |
American Astronomical Society |
| سنة النشر: |
2020 |
| المجموعة: |
Caltech Authors (California Institute of Technology) |
| مصطلحات موضوعية: |
Gravitational waves, Astronomy data analysis, Ephemerides, Pulsar timing method, Millisecond pulsars |
| الوصف: |
The regularity of pulsar emissions becomes apparent once we reference the pulses' times of arrivals to the inertial rest frame of the solar system. It follows that errors in the determination of Earth's position with respect to the solar system barycenter can appear as a time-correlated bias in pulsar-timing residual time series, affecting the searches for low-frequency gravitational waves performed with pulsar-timing arrays. Indeed, recent array data sets yield different gravitational-wave background upper limits and detection statistics when analyzed with different solar system ephemerides. Crucially, the ephemerides do not generally provide usable error representations. In this article, we describe the motivation, construction, and application of a physical model of solar system ephemeris uncertainties, which focuses on the degrees of freedom (Jupiter's orbital elements) most relevant to gravitational-wave searches with pulsar-timing arrays. This model, BayesEphem, was used to derive ephemeris-robust results in NANOGrav's 11 yr stochastic-background search, and it provides a foundation for future searches by NANOGrav and other consortia. The analysis and simulations reported here suggest that ephemeris modeling reduces the gravitational-wave sensitivity of the 11 yr data set and that this degeneracy will vanish with improved ephemerides and with pulsar-timing data sets that extend well beyond a single Jovian orbital period. ; © 2020 The American Astronomical Society. Received 2020 January 22; revised 2020 February 21; accepted 2020 February 24; published 2020 April 21. We are grateful to Agnès Fienga, Joseph Romano, Alvin Chua, and Maria Charisi for useful comments and interactions. The NANOGrav project receives support from National Science Foundation (NSF) Physics Frontier Center award #1430284. NANOGrav research at U.B.C. is supported by an NSERC Discovery Grant and Discovery Accelerator Supplement and by the Canadian Institute for Advanced Research. M.V. and J.S. acknowledge support from the JPL RTD ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| العلاقة: |
https://arxiv.org/abs/2001.00595Test; https://doi.org/10.3847/1538-4357/ab7b67Test; oai:authors.library.caltech.edu:vc3gp-ycy49; eprintid:102706; resolverid:CaltechAUTHORS:20200422-064558404 |
| DOI: |
10.3847/1538-4357/ab7b67 |
| الإتاحة: |
https://doi.org/10.3847/1538-4357/ab7b67Test |
| حقوق: |
info:eu-repo/semantics/openAccess ; Other |
| رقم الانضمام: |
edsbas.1DEC1058 |
| قاعدة البيانات: |
BASE |
