Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches
ABSTRACT In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with significantly different frequencies (including but not limited to glitch models with different frequency increments) return near-equivalent timing residuals. Th...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2021-07, Vol.504 (3), p.3399-3411 |
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description | ABSTRACT
In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with significantly different frequencies (including but not limited to glitch models with different frequency increments) return near-equivalent timing residuals. The average scheduling aperiodicity divided by the phase error due to time-of-arrival uncertainties is a useful indicator when the degeneracy is important. Synthetic data are used to explore the effect of this degeneracy systematically. It is found that phase-coherent tempo2 or temponest-based approaches are biased sometimes towards reporting small glitch sizes regardless of the true glitch size. Local estimates of the spin frequency alleviate this bias. A hidden Markov model is free from bias towards small glitches and announces explicitly the existence of multiple glitch solutions but sometimes fails to recover the correct glitch size. Two glitches in the UTMOST public data release are reassessed, one in PSR J1709−4429 at MJD 58178 and the other in PSR J1452−6036 at MJD 58600. The estimated fractional frequency jump in PSR J1709−4429 is revised upward from Δf/f = (54.6 ± 1.0) × 10−9 to (2432.2 ± 0.1) × 10−9 with the aid of additional data from the Parkes radio telescope. We find that the available UTMOST data for PSR J1452−6036 are consistent with Δf/f = 270 × 10−9 + N/(fT) with N = 0, 1, and 2, where $T \approx 1\, \text{sidereal day}$ is the observation scheduling period. Data from the Parkes radio telescope can be included, and the N = 0 case is selected unambiguously with a combined data set. |
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In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with significantly different frequencies (including but not limited to glitch models with different frequency increments) return near-equivalent timing residuals. The average scheduling aperiodicity divided by the phase error due to time-of-arrival uncertainties is a useful indicator when the degeneracy is important. Synthetic data are used to explore the effect of this degeneracy systematically. It is found that phase-coherent tempo2 or temponest-based approaches are biased sometimes towards reporting small glitch sizes regardless of the true glitch size. Local estimates of the spin frequency alleviate this bias. A hidden Markov model is free from bias towards small glitches and announces explicitly the existence of multiple glitch solutions but sometimes fails to recover the correct glitch size. Two glitches in the UTMOST public data release are reassessed, one in PSR J1709−4429 at MJD 58178 and the other in PSR J1452−6036 at MJD 58600. The estimated fractional frequency jump in PSR J1709−4429 is revised upward from Δf/f = (54.6 ± 1.0) × 10−9 to (2432.2 ± 0.1) × 10−9 with the aid of additional data from the Parkes radio telescope. We find that the available UTMOST data for PSR J1452−6036 are consistent with Δf/f = 270 × 10−9 + N/(fT) with N = 0, 1, and 2, where $T \approx 1\, \text{sidereal day}$ is the observation scheduling period. Data from the Parkes radio telescope can be included, and the N = 0 case is selected unambiguously with a combined data set.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stab1097</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2021-07, Vol.504 (3), p.3399-3411</ispartof><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c339t-1fb640746b72f6a8bc461681b59b64a588198d98fa563c78e18d2c9485c72ea53</citedby><cites>FETCH-LOGICAL-c339t-1fb640746b72f6a8bc461681b59b64a588198d98fa563c78e18d2c9485c72ea53</cites><orcidid>0000-0002-1769-6097 ; 0000-0001-9208-0009</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1598,27901,27902</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stab1097$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Dunn, L</creatorcontrib><creatorcontrib>Lower, M E</creatorcontrib><creatorcontrib>Melatos, A</creatorcontrib><title>Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with significantly different frequencies (including but not limited to glitch models with different frequency increments) return near-equivalent timing residuals. The average scheduling aperiodicity divided by the phase error due to time-of-arrival uncertainties is a useful indicator when the degeneracy is important. Synthetic data are used to explore the effect of this degeneracy systematically. It is found that phase-coherent tempo2 or temponest-based approaches are biased sometimes towards reporting small glitch sizes regardless of the true glitch size. Local estimates of the spin frequency alleviate this bias. A hidden Markov model is free from bias towards small glitches and announces explicitly the existence of multiple glitch solutions but sometimes fails to recover the correct glitch size. Two glitches in the UTMOST public data release are reassessed, one in PSR J1709−4429 at MJD 58178 and the other in PSR J1452−6036 at MJD 58600. The estimated fractional frequency jump in PSR J1709−4429 is revised upward from Δf/f = (54.6 ± 1.0) × 10−9 to (2432.2 ± 0.1) × 10−9 with the aid of additional data from the Parkes radio telescope. We find that the available UTMOST data for PSR J1452−6036 are consistent with Δf/f = 270 × 10−9 + N/(fT) with N = 0, 1, and 2, where $T \approx 1\, \text{sidereal day}$ is the observation scheduling period. Data from the Parkes radio telescope can be included, and the N = 0 case is selected unambiguously with a combined data set.</description><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkL1PwzAUxC0EEqGwMntlSGvHsWOPqCofUiUWmBgi27GLUb7k5yD1vyclMDM9nd7vTqdD6JaSNSWKbbo-athA0maW1RnKKBM8L5QQ5ygjhPFcVpReoiuAT0JIyQqRofed984mwIPHo4thaIIN6YhDjwcDLn7pFIYeg_1wzdSG_oBnNeqoO5dcxA5S6BbkFDC1oCM-tCHNPFyjC69bcDe_d4XeHnav26d8__L4vL3f55YxlXLqjShJVQpTFV5oaWwpqJDUcDU_NJeSKtko6TUXzFbSUdkUVpWS26pwmrMVWi-5Ng4A0fl6jHOreKwpqU_T1D_T1H_TzIa7xTBM43_sN5OYaUc</recordid><startdate>20210701</startdate><enddate>20210701</enddate><creator>Dunn, L</creator><creator>Lower, M E</creator><creator>Melatos, A</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-1769-6097</orcidid><orcidid>https://orcid.org/0000-0001-9208-0009</orcidid></search><sort><creationdate>20210701</creationdate><title>Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches</title><author>Dunn, L ; Lower, M E ; Melatos, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c339t-1fb640746b72f6a8bc461681b59b64a588198d98fa563c78e18d2c9485c72ea53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dunn, L</creatorcontrib><creatorcontrib>Lower, M E</creatorcontrib><creatorcontrib>Melatos, A</creatorcontrib><collection>CrossRef</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Dunn, L</au><au>Lower, M E</au><au>Melatos, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2021-07-01</date><risdate>2021</risdate><volume>504</volume><issue>3</issue><spage>3399</spage><epage>3411</epage><pages>3399-3411</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
In certain pulsar timing experiments, where observations are scheduled approximately periodically (e.g. daily), timing models with significantly different frequencies (including but not limited to glitch models with different frequency increments) return near-equivalent timing residuals. The average scheduling aperiodicity divided by the phase error due to time-of-arrival uncertainties is a useful indicator when the degeneracy is important. Synthetic data are used to explore the effect of this degeneracy systematically. It is found that phase-coherent tempo2 or temponest-based approaches are biased sometimes towards reporting small glitch sizes regardless of the true glitch size. Local estimates of the spin frequency alleviate this bias. A hidden Markov model is free from bias towards small glitches and announces explicitly the existence of multiple glitch solutions but sometimes fails to recover the correct glitch size. Two glitches in the UTMOST public data release are reassessed, one in PSR J1709−4429 at MJD 58178 and the other in PSR J1452−6036 at MJD 58600. The estimated fractional frequency jump in PSR J1709−4429 is revised upward from Δf/f = (54.6 ± 1.0) × 10−9 to (2432.2 ± 0.1) × 10−9 with the aid of additional data from the Parkes radio telescope. We find that the available UTMOST data for PSR J1452−6036 are consistent with Δf/f = 270 × 10−9 + N/(fT) with N = 0, 1, and 2, where $T \approx 1\, \text{sidereal day}$ is the observation scheduling period. Data from the Parkes radio telescope can be included, and the N = 0 case is selected unambiguously with a combined data set.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnras/stab1097</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-1769-6097</orcidid><orcidid>https://orcid.org/0000-0001-9208-0009</orcidid></addata></record> |
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title | Effects of periodicity in observation scheduling on parameter estimation of pulsar glitches |
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