Chenevez, Jérôme

We investigate the thermonuclear bursting behaviour of the X-ray transient source IGR J17473-2721, that in 2008 underwent a six month long outburst, starting (unusually) with an X-ray burst. We detected a total of 57 thermonuclear bursts throughout the outburst with AGILE, Swift, RXTE, and INTEGRAL satellites. The wide range of inferred accretion rates (betwee

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Downloaded from orbit.dtu.dk on: Dec 19, 2017The puzzling thermonuclear burst behaviour of IGR J17473-2721Chenevez, JérômePublication date:2010Document VersionEarly version, also known as pre-printLink back to DTU OrbitCitation (APA):Chenevez, J. (2010). The puzzling thermonuclear burst behaviour of IGR J17473-2721 [Sound/Visual production(digital)]. Danish Physics Society : Annual Meeting, Nyborg, Denmark, 01/01/2010,http://www.dfs.nbi.dk/aarsmoeder/2010/aarsmoede.phpJérôme ChenevezPuzzling thermonuclear bursts from the transient low-mass X-ray binary IGR J17473-2721Diego AltamiranoDuncan GallowayJean in ‘t Zand Erik KuulkersNathalie DegenaarMaurizio FalangaEttore Del MonteY. EvangelistaM. FerociE. Costa20/5 2010Astrofysik møde2 DTU Space, Technical University of DenmarkA paper submitted to MNRAS20/5 2010Astrofysik møde3 DTU Space, Technical University of Denmark• : Mixed H/He burning  triggered by thermally unstable H ignition.Long burst duration (> 100s - 1000s) due to rp- process. 150.• : H stable burning (hot CNO cycle) to He Pure He flash (3-). Frequent PRE. 200.• : Mixed H/He burning triggered by thermally unstable He ignition.Burst duration > 10s due to rp- process. ~20-100.• : No bursts (e.g. pulsars).Thick He burning (e.g. pure He accretion in UCXB)  Long He bursts (~1041 ergs).Deep Carbon burning in superbursts (duration ~hours, released energy ~1042 ergs).Nuclear burning regimes/sg/cm 900 2 m/sg/cm 2000900 2  mEddmm    2/sg/cm 2000Eddmm    H unstabilityHe unstabilityTheoretical thresholds:mEdd = 105 g/cm2/s∙20/5 2010Astrofysik møde4 DTU Space, Technical University of DenmarkIGR J17473-2721 aka XTE J1747-274• Located in the Galactic Bulge, 0.8º from GX 3+1• Transient X-ray source, discovered in 2005 (Grebenev et al., ATel 467)NIR counterpart (ATels 521, 634) - 2 (unpublished) X-ray bursts in RXTE• 2nd outburst March – September 2008 (ATels 1445, 1459, 1460, 1461, 1468, 1651)INTEGRAL + RXTE + Swift coverage (57 X-ray bursts)JEM-X5-10 keV6/4/200820/5 2010Astrofysik møde5 DTU Space, Technical University of DenmarkOutburst with sudden spectral transition20/5 2010Astrofysik møde6 DTU Space, Technical University of DenmarkDiagrams of the 2008-outburstHIDCCDFrom RXTE/PCA measurements20/5 2010Astrofysik møde7 DTU Space, Technical University of DenmarkBurst as precursor of outburst?Fpeak 0.5 CrabDuration 44sFpers ~10-10 erg/cm2/s20/5 2010Astrofysik møde8 DTU Space, Technical University of DenmarkRise time: 5sExp. decay times: 12 + 25s=> He/H burningThe burst observed by SwiftFbolp  100∙10-9 erg/cm2/s20/5 2010Astrofysik møde9 DTU Space, Technical University of DenmarkTime-resolved spectral analysis of the Swift burst⇒ Fp  LEdd @ d= 5.4 kpc20/5 2010Astrofysik møde10 DTU Space, Technical University of DenmarkJEM-X bursts2s binsHHe/HHe H/HeRise: 3-9s: 10-30sRise: 1-5s: 7-14s20/5 2010Astrofysik møde11 DTU Space, Technical University of Denmark42 RXTE/PCA burstsH/He (stable He) HeHe/H (stable H)Rise: 6-9s: 10-18sRise: 2-5s: 8-16s20/5 2010Astrofysik møde12 DTU Space, Technical University of DenmarkA double burst observed by RXTE/PCA20/5 2010Astrofysik møde13 DTU Space, Technical University of DenmarkBurst propertiesBurst decays vs. emission intensityBurst intensity vs. decays20/5 2010Astrofysik møde14 DTU Space, Technical University of DenmarkOutburst with sudden spectral transition20/5 2010Astrofysik møde15 DTU Space, Technical University of DenmarkBurst rate vs. accretion rate20/5 2010Astrofysik møde16 DTU Space, Technical University of Denmark• Identification of IGR J17473-2721 as a transient NS –LMXB source• Dramatic spectral transition simultaneous with burst intermission at outburst peak.• Distance 5.5 kpc derived from Eddington-limited PRE bursts• 57 X-ray bursts ⇒ 7 different regimes identified:1. Hard He bursts at outburst onset (very low accretion rate)2. He-trig. H/He bursts in hard state (short recurrence times)3. He/H bursts with H & He stable burning at high accretion rate4. No burst activity at soft-high state (due to a SUPERBURST?)5. Pure He bursts (with PRE) at soft-low state6. Mixed He/H burning at hard-low state7. Last He burst at low accretion rate in soft state• Rising bursting rate < 15% Eddington accretion rate and hysteresisSUMMARY

The puzzling thermonuclear burst behaviour of IGR J17473-2721

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 19, 2017The puzzling thermonuclear burst behaviour of IGR J17473-2721Chenevez, JérômePublication date:2010Document VersionEarly version, also known as pre-printLink back to DTU OrbitCitation (APA):Chenevez, J. (2010). The puzzling thermonuclear burst behaviour of IGR J17473-2721 [Sound/Visual production(digital)]. X-ray bursts and burst oscillations, Lorentz Center, Leiden, NL, 01/01/2010,http://www.lorentzcenter.nl/lc/web/2010/408/info.php3?wsid=408Jérôme ChenevezPuzzling thermonuclear bursts from the transient low-mass X-ray binary IGR J17473-2721Diego AltamiranoDuncan GallowayJean in ‘t Zand Erik KuulkersNathalie DegenaarMaurizio FalangaEttore Del MonteY. EvangelistaM. FerociE. Costa20/5 2010Astrofysik møde2 DTU Space, Technical University of DenmarkA paper submitted to MNRAS20/5 2010Astrofysik møde3 DTU Space, Technical University of Denmark• : Mixed H/He burning  triggered by thermally unstable H ignition.Long burst duration (> 100s - 1000s) due to rp- process. 150.• : H stable burning (hot CNO cycle) to He Pure He flash (3-). Frequent PRE. 200.• : Mixed H/He burning triggered by thermally unstable He ignition.Burst duration > 10s due to rp- process. ~20-100.• : No bursts (e.g. pulsars).Thick He burning (e.g. pure He accretion in UCXB)  Long He bursts (~1041 ergs).Deep Carbon burning in superbursts (duration ~hours, released energy ~1042 ergs).Nuclear burning regimes/sg/cm 900 2 m/sg/cm 2000900 2  mEddmm    2/sg/cm 2000Eddmm    H unstabilityHe unstabilityTheoretical thresholds:mEdd = 105 g/cm2/s∙20/5 2010Astrofysik møde4 DTU Space, Technical University of DenmarkIGR J17473-2721 aka XTE J1747-274• Located in the Galactic Bulge, 0.8º from GX 3+1• Transient X-ray source, discovered in 2005 (Grebenev et al., ATel 467)NIR counterpart (ATels 521, 634) - 2 (unpublished) X-ray bursts in RXTE• 2nd outburst March – September 2008 (ATels 1445, 1459, 1460, 1461, 1468, 1651)INTEGRAL + RXTE + Swift coverage (57 X-ray bursts)JEM-X5-10 keV6/4/200820/5 2010Astrofysik møde5 DTU Space, Technical University of DenmarkOutburst with sudden spectral transition20/5 2010Astrofysik møde6 DTU Space, Technical University of DenmarkDiagrams of the 2008-outburstHIDCCDFrom RXTE/PCA measurements20/5 2010Astrofysik møde7 DTU Space, Technical University of DenmarkBurst as precursor of outburst?Fpeak 0.5 CrabDuration 44sFpers ~10-10 erg/cm2/s20/5 2010Astrofysik møde8 DTU Space, Technical University of DenmarkRise time: 5sExp. decay times: 12 + 25s=> He/H burningThe burst observed by SwiftFbolp  100∙10-9 erg/cm2/s20/5 2010Astrofysik møde9 DTU Space, Technical University of DenmarkTime-resolved spectral analysis of the Swift burst⇒ Fp  LEdd @ d= 5.4 kpc20/5 2010Astrofysik møde10 DTU Space, Technical University of DenmarkJEM-X bursts2s binsHHe/HHe H/HeRise: 3-9s: 10-30sRise: 1-5s: 7-14s20/5 2010Astrofysik møde11 DTU Space, Technical University of Denmark42 RXTE/PCA burstsH/He (stable He) HeHe/H (stable H)Rise: 6-9s: 10-18sRise: 2-5s: 8-16s20/5 2010Astrofysik møde12 DTU Space, Technical University of DenmarkA double burst observed by RXTE/PCA20/5 2010Astrofysik møde13 DTU Space, Technical University of DenmarkBurst propertiesBurst decays vs. emission intensityBurst intensity vs. decays20/5 2010Astrofysik møde14 DTU Space, Technical University of DenmarkOutburst with sudden spectral transition20/5 2010Astrofysik møde15 DTU Space, Technical University of DenmarkBurst rate vs. accretion rate20/5 2010Astrofysik møde16 DTU Space, Technical University of Denmark• Identification of IGR J17473-2721 as a transient NS –LMXB source• Dramatic spectral transition simultaneous with burst intermission at outburst peak.• Distance 5.5 kpc derived from Eddington-limited PRE bursts• 57 X-ray bursts ⇒ 7 different regimes identified:1. Hard He bursts at outburst onset (very low accretion rate)2. He-trig. H/He bursts in hard state (short recurrence times)3. He/H bursts with H & He stable burning at high accretion rate4. No burst activity at soft-high state (due to a SUPERBURST?)5. Pure He bursts (with PRE) at soft-low state6. Mixed He/H burning at hard-low state7. Last He burst at low accretion rate in soft state• Rising bursting rate < 15% Eddington accretion rate and hysteresisSUMMARY

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The puzzling thermonuclear burst behaviour of IGR J17473-2721

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