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Quiescent thermal emission from neutron stars in LMXBs

Turlione, Anabela and Aguilera, Deborah N. and Pons, José A. (2013) Quiescent thermal emission from neutron stars in LMXBs. Astronomy and Astrophysics. EDP Sciences. ISSN 0004-6361

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Official URL: http://arxiv.org/abs/arXiv:1309.3909

Abstract

The quiescent thermal emission from neutron stars in low mass X-ray binaries after active periods of intense activity in x-rays (outbursts) has been monitored. The theoretical modeling of the thermal relaxation of the neutron star crust may be used to establish constraints on the crust and envelope composition and transport properties, depending on the astrophysical scenarios assumed. We perform numerical simulations of the neutron star crust thermal evolution and compare them with inferred surface temperatures for five sources: MXB 1659-29, KS 1731-260, EXO 0748-676, XTE J1701-462 and IGR J17480-2446. We also present stationary envelope models to be used as a boundary condition for the crustal cooling models. We obtain a relation between the mass accretion rate and the temperature reached at the crust-envelope interface at the end of the active phase that accounts for early observations and reduces the number of free parameters of the problem. With this relation we are also able to set constraints to the envelope composition depending on the accretion mass rate. We find that the evolution of MXB 1659-29, KS 1731-260 and EXO 0748-676 can be well described within a deep crustal cooling scenario. Conversely, we find that other two sources can only be explained with models beyond crustal cooling. For the peculiar emission of XTE J1701-462 we propose alternative scenarios like residual accretion during quiescence, additional heat sources in the outer crust and/or thermal isolation of the inner crust due to a buried magnetic field. We also explain the very recent reported temperature of IGR J17480-2446 with an extra heat deposition in the outer crust coming from shallow sources.

Item URL in elib:https://elib.dlr.de/88206/
Document Type:Article
Title:Quiescent thermal emission from neutron stars in LMXBs
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Turlione, AnabelaTandar Laboratory, Buenos Aires, ArgentinaUNSPECIFIED
Aguilera, Deborah N.DLR-RY BremenUNSPECIFIED
Pons, José A.University of Alicante, SpainUNSPECIFIED
Date:2013
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:neutron stars, LMXBs, X-ray emission, quiescence
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):Vorhaben Quantensensorik
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systems Enabling Technologies
Deposited By: Aguilera, Deborah
Deposited On:13 Feb 2014 10:32
Last Modified:31 Jul 2019 19:45

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