English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

When neutron stars reside in transient X-ray binaries, their crustal layersbecome heated during accretion outbursts and subsequently cool in quiescence.Observing and modeling this thermal response has yielded valuable insight intothe physics of neutron star crusts. However, one unresolved problem is theevidence in several neutron stars for an extra energy source, located atshallow depth in the crust, that is not accounted for by standard heatingmodels. Its origin remains puzzling, and it is currently unclear whether thisadditional heating occurs in all neutron stars, and if the magnitude is alwaysthe same. Here, we report on Chandra observations that cover two years afterthe 2012 outburst of the transient neutron star X-ray binary SwiftJ174805.3-244637 in the globular cluster Terzan 5. The temperature of theneutron star was elevated during the first two months following its ~8 weekaccretion episode, but had decayed to the pre-outburst level within ~100 days.Interpreting this as rapid cooling of the accretion-heated crust, we model theobserved temperature curve with a thermal evolution code. We find that there isno need to invoke shallow heating for this neutron star, although an extraenergy release up to ~1.4 MeV/nucleon is allowed by the current data (2-sigmaconfidence). We also present two new data points on the crust cooling curve ofthe 11-Hz X-ray pulsar IGR J17480-2446 in Terzan 5, which was active in 2010.The temperature of this neutron star remained significantly above itspre-outburst level, but we detect no temperature change since the previousmeasurements of 2013 February. This is consistent with the slower coolingexpected several years post-outburst.

Neutron star crust cooling in the Terzan 5 X-ray transient Swift J174805.3-244637