Periodic Reporting for period 1 - SF-magnetic-stars (The impact of superfluidity and superconductivity on the magneto-thermal evolution and X-ray observations of neutron stars.)
Reporting period: 2015-06-01 to 2017-05-31
Strongly magnetized neutron stars also show a very rich X-ray activity which include outbursts and flares. In the tail of two giant flares (SGR 1806-20 and SGR 1900+14), which are rare and very powerful events, the power spectra revealed a series of quasi-periodic oscillations (QPOs). The detection of QPOs was very important, because has opened the possibility to use Asteroseismology to study the physics of neutron stars, i.e. to infer the properties of the system by studying its seismic wave propagation. This very powerful and well-established technique has been successfully used to study the interior of the Sun and other variable stars. With this research project we have studied the seismic vibrations of magnetars by introducing important physical ingredients in the stellar model. To exploit the potentiality of Astereoseismology, we need in fact sophisticated theoretical models and accurate templates to compare with observations.
The objectives of this research project were to provide a more detailed description of the neutron star dynamics in order to have better theoretical models for the analysis of X-ray observations. The project mainly focused on the study of the magnetic field evolution in the core of neutron stars, and on the seismology of magnetars. The combined information available from thermal history and magnetar QPOs can in fact be potentially used to determine the physical properties of highly magnetized neutron stars as well as to constrain the equation of state of dense matter.
- A. Passamonti, J. Pons (2016), MNRAS 463, 1173, “Quasi-periodic oscillations in superfluid, relativistic magnetars with nuclear pasta phases”. arXiv:1606.02132
- A. Passamonti, T. Akgün, J. Pons, J.A. Miralles (2017), MNRAS 465, 3416, “The relevance of ambipolar diffusion for neutron star evolution”. arXiv:1608.00001
- A. Passamonti, T. Akgün, J. Pons, J.A. Miralles (2017), Accepted for publication in MNRAS, “On the magnetic field evolution timescale in superconducting neutron star cores”. arXiv:1704.02016
1) 13-15-April 2016, University of Alicante, Spain. NewCompStar Working Group Meeting on “Origin, evolution and observable effects on the magnetic field in neutron stars”.
2) 2-6 May 2016, “Conference of the Italian Astronomical Society” SaIT, Roma, Italy
3) 4-8 July 206, Athens, Grece. Conference: European Week of Astronomy and Space Science (EWASS).
4) 13-14 September 2016, Southampton, UK: NewCompStar Working Group Meeting on “Neutron Star Oscillations and Instabilities”.
5) 26-29 October, 2016, Physikzentrum Bad Honnef, Germany. Conference on: “Neutron Stars: A Cosmic Laboratory for MAtter under Extreme Conditions”.
6) 14-16 December 2016, University of Valencia, Spain. CoCuNuT Meeting 2016.
7) 27-31 March 2017, Annual NewCompStar Conference, University of Warsaw, Poland.
* Other relevant work
- During the fellowship I refereed four papers for the journals: “Monthly Notices of the Royal Astronomical Society” and “Physical Review D”.
- April 2016. Event: “Infoday Mobility opportunities and MSCA-IF”, Valencia, Spain. Organized by Ruvid (Red de Universidades Valenciana para el fomento de la Investigacion, el Desarollo y la Innovacion). I participated in this event with a seminar to report my experience as Marie-Curie fellow and provide some tips to organize a Marie-Curie application.