High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburstCitation formats

  • External authors:
  • D.J. Champion
  • I {Cognard}
  • Marilyn Cruces
  • G Desvignes
  • Fabian Jankowski
  • R. Karappusamy
  • C Kouveliotou
  • Michael Kramer
  • Kuo Liu
  • Andrew Lyne
  • Mitchell Mickaliger
  • Brendan O'Connor
  • Aditya Parthasarathy
  • Nataliya Porayko
  • Kaustubh Rajwade
  • P Torne
  • Alexander van der Horst

Standard

High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst. / Champion, D.J.; {Cognard}, I; Cruces, Marilyn; Desvignes, G; Jankowski, Fabian; Karappusamy, R.; Keith, Michael; Kouveliotou, C; Kramer, Michael; Liu, Kuo; Lyne, Andrew; Mickaliger, Mitchell; O'Connor, Brendan; Parthasarathy, Aditya; Porayko, Nataliya; Rajwade, Kaustubh; Stappers, Benjamin; Torne, P; van der Horst, Alexander; Weltevrede, Patrick.

In: Monthly Notices of the Royal Astronomical Society, 08.09.2020.

Research output: Contribution to journalArticlepeer-review

Harvard

Champion, DJ, {Cognard}, I, Cruces, M, Desvignes, G, Jankowski, F, Karappusamy, R, Keith, M, Kouveliotou, C, Kramer, M, Liu, K, Lyne, A, Mickaliger, M, O'Connor, B, Parthasarathy, A, Porayko, N, Rajwade, K, Stappers, B, Torne, P, van der Horst, A & Weltevrede, P 2020, 'High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst', Monthly Notices of the Royal Astronomical Society.

APA

Champion, D. J., {Cognard}, I., Cruces, M., Desvignes, G., Jankowski, F., Karappusamy, R., Keith, M., Kouveliotou, C., Kramer, M., Liu, K., Lyne, A., Mickaliger, M., O'Connor, B., Parthasarathy, A., Porayko, N., Rajwade, K., Stappers, B., Torne, P., van der Horst, A., & Weltevrede, P. (Accepted/In press). High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst. Monthly Notices of the Royal Astronomical Society.

Vancouver

Champion DJ, {Cognard} I, Cruces M, Desvignes G, Jankowski F, Karappusamy R et al. High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst. Monthly Notices of the Royal Astronomical Society. 2020 Sep 8.

Author

Champion, D.J. ; {Cognard}, I ; Cruces, Marilyn ; Desvignes, G ; Jankowski, Fabian ; Karappusamy, R. ; Keith, Michael ; Kouveliotou, C ; Kramer, Michael ; Liu, Kuo ; Lyne, Andrew ; Mickaliger, Mitchell ; O'Connor, Brendan ; Parthasarathy, Aditya ; Porayko, Nataliya ; Rajwade, Kaustubh ; Stappers, Benjamin ; Torne, P ; van der Horst, Alexander ; Weltevrede, Patrick. / High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst. In: Monthly Notices of the Royal Astronomical Society. 2020.

Bibtex

@article{c77f31ef6444469d927fd8a5cbee0d8e,
title = "High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst",
abstract = "We report on multi-frequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than 35 hours after its registered first outburst. We obtained timing, polarisation and spectral information. Swift J1818.0-1607 has an unusually steep spectrum for a radio emitting magnetar and also has a relatively narrow and simple pulse profile. The position angle swing of the polarisation is flat over the pulse profile, possibly suggesting that our line-of-sight grazes the edge of the emission beam. This may also explain the steep spectrum. The spin evolution shows large variation in the spin-down rate, associated with four distinct timing events over the course of our observations. Those events may be related to the appearance and disappearance of a second pulse component. The first timing event coincides with our actual observations, while we did not detect significant changes in the emission properties which could reveal further magnetospheric changes. Characteristic ages inferred from the timing measurements over the course of months vary by nearly an order of magnitude. A longer-term spin-down measurement over approximately 100 days suggests an characteristic age of about 500 years, larger than previously reported. Though Swift J1818.0-1607 could still be one of the youngest neutron stars (and magnetars) detected so far, we caution using the characteristic age as a true-age indicator given the caveats behind its calculation.",
author = "D.J. Champion and I {Cognard} and Marilyn Cruces and G Desvignes and Fabian Jankowski and R. Karappusamy and Michael Keith and C Kouveliotou and Michael Kramer and Kuo Liu and Andrew Lyne and Mitchell Mickaliger and Brendan O'Connor and Aditya Parthasarathy and Nataliya Porayko and Kaustubh Rajwade and Benjamin Stappers and P Torne and {van der Horst}, Alexander and Patrick Weltevrede",
year = "2020",
month = sep,
day = "8",
language = "English",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "1365-2966",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst

AU - Champion, D.J.

AU - {Cognard}, I

AU - Cruces, Marilyn

AU - Desvignes, G

AU - Jankowski, Fabian

AU - Karappusamy, R.

AU - Keith, Michael

AU - Kouveliotou, C

AU - Kramer, Michael

AU - Liu, Kuo

AU - Lyne, Andrew

AU - Mickaliger, Mitchell

AU - O'Connor, Brendan

AU - Parthasarathy, Aditya

AU - Porayko, Nataliya

AU - Rajwade, Kaustubh

AU - Stappers, Benjamin

AU - Torne, P

AU - van der Horst, Alexander

AU - Weltevrede, Patrick

PY - 2020/9/8

Y1 - 2020/9/8

N2 - We report on multi-frequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than 35 hours after its registered first outburst. We obtained timing, polarisation and spectral information. Swift J1818.0-1607 has an unusually steep spectrum for a radio emitting magnetar and also has a relatively narrow and simple pulse profile. The position angle swing of the polarisation is flat over the pulse profile, possibly suggesting that our line-of-sight grazes the edge of the emission beam. This may also explain the steep spectrum. The spin evolution shows large variation in the spin-down rate, associated with four distinct timing events over the course of our observations. Those events may be related to the appearance and disappearance of a second pulse component. The first timing event coincides with our actual observations, while we did not detect significant changes in the emission properties which could reveal further magnetospheric changes. Characteristic ages inferred from the timing measurements over the course of months vary by nearly an order of magnitude. A longer-term spin-down measurement over approximately 100 days suggests an characteristic age of about 500 years, larger than previously reported. Though Swift J1818.0-1607 could still be one of the youngest neutron stars (and magnetars) detected so far, we caution using the characteristic age as a true-age indicator given the caveats behind its calculation.

AB - We report on multi-frequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than 35 hours after its registered first outburst. We obtained timing, polarisation and spectral information. Swift J1818.0-1607 has an unusually steep spectrum for a radio emitting magnetar and also has a relatively narrow and simple pulse profile. The position angle swing of the polarisation is flat over the pulse profile, possibly suggesting that our line-of-sight grazes the edge of the emission beam. This may also explain the steep spectrum. The spin evolution shows large variation in the spin-down rate, associated with four distinct timing events over the course of our observations. Those events may be related to the appearance and disappearance of a second pulse component. The first timing event coincides with our actual observations, while we did not detect significant changes in the emission properties which could reveal further magnetospheric changes. Characteristic ages inferred from the timing measurements over the course of months vary by nearly an order of magnitude. A longer-term spin-down measurement over approximately 100 days suggests an characteristic age of about 500 years, larger than previously reported. Though Swift J1818.0-1607 could still be one of the youngest neutron stars (and magnetars) detected so far, we caution using the characteristic age as a true-age indicator given the caveats behind its calculation.

M3 - Article

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 1365-2966

ER -