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The Influence of Stellar Spin on Ignition of Thermonuclear Runaways

dc.contributor.authorGALLOWAY, Duncan K.
dc.contributor.authorIN 'T ZAND, Jean J.M.
dc.contributor.authorCHENEVEZ, Jérôme
dc.contributor.authorKEEK, Laurens
dc.contributor.authorSANCHEZ-FERNANDEZ, Celia
dc.contributor.authorWORPEL, Hauke
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorLAMPE, Nathanael
dc.contributor.authorKUULKERS, Erik
dc.contributor.authorWATTS, Anna
dc.contributor.authorOOTES, Laura
dc.date.issued2018
dc.description.abstractEnRunaway thermonuclear burning of a layer of accumulated fuel on the surface of a compact star provides a brief but intense display of stellar nuclear processes. For neutron stars accreting from a binary companion, these events manifest as thermonuclear (type-I) X-ray bursts, and recur on typical timescales of hours to days. We measured the burst rate as a function of accretion rate, from seven neutron stars with known spin rates, using a burst sample accumulated over several decades. At the highest accretion rates, the burst rate is lower for faster spinning stars. The observations imply that fast (>400 Hz) rotation encourages stabilization of nuclear burning, suggesting a dynamical dependence of nuclear ignition on the spin rate. This dependence is unexpected, because faster rotation entails less shear between the surrounding accretion disk and the star. Large-scale circulation in the fuel layer, leading to enhanced mixing of the burst ashes into the fuel layer, may explain this behavior; further numerical simulations are required to confirm this.
dc.language.isoen
dc.subject.ennuclear reactions
dc.subject.ennucleosynthesis
dc.subject.enabundances
dc.subject.enstars: neutron
dc.subject.enstars: rotation
dc.subject.enX-rays: bursts
dc.title.enThe Influence of Stellar Spin on Ignition of Thermonuclear Runaways
dc.typeArticle de revue
dc.identifier.doi10.3847/2041-8213/aabd32
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1804.03380
bordeaux.journalAstrophys.J.Lett
bordeaux.pageL24
bordeaux.volume857
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-01781913
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01781913v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophys.J.Lett&rft.date=2018&rft.volume=857&rft.issue=2&rft.spage=L24&rft.epage=L24&rft.au=GALLOWAY,%20Duncan%20K.&IN%20'T%20ZAND,%20Jean%20J.M.&CHENEVEZ,%20J%C3%A9r%C3%B4me&KEEK,%20Laurens&SANCHEZ-FERNANDEZ,%20Celia&rft.genre=article


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