NS, Magnetar, GRB astrophysics with...
Transcript of NS, Magnetar, GRB astrophysics with...
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NS, Magnetar, GRB astrophysics with GWsNS, Magnetar, GRB astrophysics with GWs
Rencontres de Moriond – La Thuile, 2015, March 21-28Rencontres de Moriond – La Thuile, 2015, March 21-28
Simone Dall'OssoTAT- Tübingen University
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Advanced deectors and GW astronomyAdvanced deectors and GW astronomy
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Outline of the TalkOutline of the Talk
GW bursts from SGRs: magnetar oscillations excited at Giant Flares;
GWs from newly born magnetars: long-lasting GW signals due tomagnetically-induced deformations/secular bar-instability
Continuous Waves (CW): isolated radio pulsars and accreting NSs inLow Mass X-ray Binaries
GWs from (short) GRBs: role of the EOS and magnetic felds in themerger outcome; event rates; GW astronomy with aLIGO/Virgo
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NS physics and GWsNS physics and GWs
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- interior magnetic feld: strength, geometry and location
- NS structure: moment of inertia, sources of deformation and viscosity
- origin of NS magnetic felds; stellar progenitors of different NS classes
NS physics and GWsNS physics and GWs
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Continuous Waves from NSsContinuous Waves from NSs
h0∼QD
Ω2
Q≈ϵ I
Radio pulsars: i) maximum deformation sustained by the crust ε ~10-5 -10-6 (EOS dependent)ii) current nondetection LIGO beats spindown limit for Crab/Vela (ε =10-4 )
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Continuous Waves from NSsContinuous Waves from NSs
h0∼QD
Ω2
Q≈ϵ I
Superconductivity: increases magnetic stresses by a factor H c1
B∼ 102−103
Radio pulsars: i) maximum deformation sustained by the crust ε ~10-5 -10-6 (EOS dependent)ii) current nondetection LIGO beats spindown limit for Crab/Vela (ε =10-4 )
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Continuous Waves from NSsContinuous Waves from NSs
h0∼QD
Ω2
Q≈ϵ I
LMXBs: i) accretion-induced “mountains” or r-modes can excite GW emissionii) X-ray obs. suggest spin equilibrium due to accretion physics (Patruno 2011)
iii) strain upper limits for Sco X-1 are ~ 6 times larger than maximumexpected at spin equilibrium in best case (Aasi et al. 2014).
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Continuous Waves from NSsContinuous Waves from NSs
h0∼QD
Ω2
Q≈ϵ I
LMXBs: iv) can be improved by at least 2 orders with longer observations (months vs.days) and improved sensitivity of aLIGO/Virgov) r-mode coupling to B-feld can amplify the feld and induce ε~10-9 (Cuofano
et al. 2012; cf. Rezzolla et al. 2001) consistent with observational limits.
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MagnetarsMagnetars
Galactic X-ray Pulsators with:
- slow spins (5-12 s)
- spindown dP/dt ~ 10-10-10-12
Anomalous X-ray Pulsars/Soft Gamma Repeaters
Bdip∼1013÷15G
Magnetic energy best candidate
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- 3 Giant Flares observed in ~30 yrs from 5 SGRs (+9 AXPs)
- Energy of 1979 and 1998 events ~ few ×1044 ergs
MagnetarsMagnetars
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- 3 Giant Flares observed in ~30 yrs from 5 SGRs (+9 AXPs)
- Energy of 1979 and 1998 events ~ few ×1044 ergs
MagnetarsMagnetars
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Similar phenomenology and frequencies
same basic mechanism?Association: either internal (Alfven) modesor crustal oscillations (Israel et al. 2005)(Watts & Strohmeyer06)
Detailed models to understand the physics Effect of strong B on frequencies?(Colaiuda & Kokkotas 2009, 20011, 2012Gabler et al. 2011)
SGR1806-20: 18 – 30.4 - 61 - 92.5 - 150 - 625 - 1840 Hz
SGR1900+14: 28.5 - 52.5 – 84 - 155.5 Hz
QPO's & NS asteroseismologyQPO's & NS asteroseismology
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Magnetar oscillations and GW “bursts”Magnetar oscillations and GW “bursts”
GW Bursts: LIGO upper limits rule out by one order of magnitude optimistcpredictions (Ioka 2003, Owen & Corsi 2009). E<1048 erg vs. 1048- 1049 erg
f-mode: semi-analytical calculations (Levin & van Hoven 2011), and fullyrelativistic numerical simulations (Zink, Lasky & Kokkotas 2011) show thatf-mode excitation depends strongly on B-feld and remains always low.
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Magnetar oscillations and GW “bursts”Magnetar oscillations and GW “bursts”
GW Bursts: LIGO upper limits rule out by one order of magnitude optimistcpredictions (Ioka 2003, Owen & Corsi 2009). E<1048 erg vs. 1048- 1049 erg
Zink, Lasky & Kokkotas 2011
f-mode: semi-analytical calculations (Levin & van Hoven 2011), and fullyrelativistic numerical simulations (Zink, Lasky & Kokkotas 2011) show thatf-mode excitation depends strongly on B-feld and remains always low.
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Magnetar oscillations and GW “bursts”Magnetar oscillations and GW “bursts”
GW Bursts: LIGO upper limits rule out by one order of magnitude optimistcpredictions (Ioka 2003, Owen & Corsi 2009). E<1048 erg vs. 1048- 1049 erg
f-mode: semi-analytical calculations (Levin & van Hoven 2011), and fullyrelativistic numerical simulations (Zink, Lasky & Kokkotas 2011) show thatf-mode excitation has low amplitude and depends strongly on B-feld.
lower-frequency modes: crustal torsional modes are found to reach muchlarger amplitudes (Levin & van Hoven 2011); these might even couple to Alfvenmodes in the core thus leading to global oscillations.
Numerical simulations (Zink, Lasky & Kokkotas 2011) also fnd signifcant powerat ~ 50-200 Hz, associated to Alfven modes in the core.
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Long-GRBsLong-GRBs
Relativistic outfow Γ ~ 102 -103
Shock converts Ekin
to radiation (Sari&Piran 1997, Piran 1999)
i) collapsar that forms a BH (Woosley & MacFadyen 1999);
ii) ultramagnetized, ms spinning NS (Usov 1992)
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Long-GRBsLong-GRBs
Relativistic outfow Γ ~ 102 -103
Shock converts Ekin
to radiation (Sari&Piran 1997, Piran 1999)
i) collapsar that forms a BH (Woosley & MacFadyen 1999);
ii) ultramagnetized, ms spinning NS (Usov 1992)
iii) a ms spinning, ultramagnetized NS might form in the collapsing core of amassive star (Metzger et al. 2006, Bucciantini et al. 2006, Metzger et al. 2011)
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Long-GRBsLong-GRBs
Relativistic outfow Γ ~ 102 -103
Shock converts Ekin
to radiation (Sari&Piran 1997, Piran 1999)
i) collapsar that forms a BH (Woosley & MacFadyen 1999);
ii) ultramagnetized, ms spinning NS (Usov 1992)
iii) a ms spinning, ultramagnetized NS might form in the collapsing core of amassive star (Metzger et al. 2006, Bucciantini et al. 2006, Metzger et al. 2011)
GW signature of the collapse phase? (cf. Ando et al. 2013; Piro & Ott 2011).
GW signature from jet acceleration? (Piran & Birnholtz 2013)
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ms-spinning proto-NS, differential rotation converted to toroidal magnetic feld B~1016 G → magnetic energy dissipation powers high-energy emission from here on (Duncan & Thompson 1992 → 2001 )
The magnetar-GRB connectionThe magnetar-GRB connection
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ms-spinning proto-NS, differential rotation converted to toroidal magnetic feld B~1016 G → magnetic energy dissipation powers high-energy emission from here on (Duncan & Thompson 1992 → 2001 )
E spin∼3×1052( Pms )
2
erg s−1
Bd∼1014−1015 G
Bcore∼1016 G
The magnetar-GRB connectionThe magnetar-GRB connection
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ms-spinning proto-NS, differential rotation converted to toroidal magnetic feld B~1016 G → magnetic energy dissipation powers high-energy emission from here on (Duncan & Thompson 1992 → 2001 )
E spin∼3×1052( Pms )
2
erg s−1
Bd∼1014−1015 G
Bcore∼1016 G
The magnetar-GRB connectionThe magnetar-GRB connection
Magnetic dipole spindown ~102 -104 s
GW emission in ~103 -105 s
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ms-spinning proto-NS, differential rotation converted to twisted magnetic feld B~1016 G → magnetic energy dissipation powers high-energy emission from here on (Duncan & Thompson 1992 → 2001 )
Magnetar formation scenarioMagnetar formation scenario
0 ~1 day~ 1 hr
103-104 yrs
Dynamo/fipping
- GW “reversed-chirp”- EM spindown/GRB plateau
SGRs/AXPsGiant Flares, Magneticdecay and X-ray emission
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The magnetar-GRB connectionThe magnetar-GRB connection
Nousek et al. (2006)
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The magnetar-GRB connectionThe magnetar-GRB connection
Nousek et al. (2006)
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The magnetar-GRB connectionThe magnetar-GRB connectionThe magnetar-GRB connectionThe magnetar-GRB connection
Dall'Osso et al. 2011
Cf. Zhang & Meszaros (2001)
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The magnetar-GRB connectionThe magnetar-GRB connection
Dall'Osso et al. 2011
Cf. Zhang & Meszaros (2001)
The magnetar-GRB connectionThe magnetar-GRB connection
Bernardini et al. 2012
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The magnetar-GRB connectionThe magnetar-GRB connection
TOROIDAL B → PROLATE DISTORTION
Ω Bt
χ
χ≠0 excites freebody precession
Ωpre= εBΩcosχ (Mestel & Takhar72)
cf. Cutler (2002)Stella et al. (@005); Dall'Osso et al. (2009)
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GW emissionmaximised !
Bt
spin
pole-onpole-on
spin
Bt
pole-onpole-on
Internal dissipation
L = IΩ E = IΩ2
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The magnetar-GRB connectionThe magnetar-GRB connection
TOROIDAL B → PROLATE DISTORTION
χ≠0 excites freebody precession
Ωpre= εBΩcosχ (Mestel & Takhar72)
Mastrano et al. 2011Akgün et al. 2013
ϵB≃3.4×10−7 Bdip ,142 R12
4
M 1.42 (1−0.37
ET
E pol
)
ϵB0 ∼
E B
E grav
≃3.5×10−4 B162 R6
4 M 1.4−2
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Δt ~ 105 s
Ω̇=−23
μd2
I c3 Ω3−32
5G
c5 I ϵB2 Ω5
How strong are the expected signals?How strong are the expected signals?
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Ω̇=−23
μd2
I c3 Ω3−32
5G
c5 I ϵB2 Ω5
How strong are the expected signals?How strong are the expected signals?
Event Rate: How many Magnetars? > 1 every 103 yrs in the Galaxy (Gaensler et al. 1999)
Have to search a nearby cluster (Virgo)
i) Distance of expected signals ~ 20 Mpc
ii) transients might imply an increase in the formation rate.
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Ω̇=−23
μd2
I c3 Ω3−32
5G
c5 I ϵB2 Ω5
How strong are the expected signals?How strong are the expected signals?
@D = 20 Mpc
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The magnetar-GRB connectionThe magnetar-GRB connection
Corsi & Meszaros (2009)
Secular bar-instability: T∣W∣
≥0.14 Growth time ~ 102-104 s
The non-axisymmetric NS emits GWs and spins down, sweeping theLIGO/Virgo range from hundreds of Hz to ≤ Hz
(cf. Doneva, Kokkotas, →azaev 2015)
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Short-GRBsShort-GRBs
inspiral GW-driven, ~ point-mass+tidal @D = 200 MpcAbadie et al. 2010
Rate:0.4/40/400 per yrAbadie et al. 2010
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Short-GRBsShort-GRBs
merger
inspiral
shocks, violent dynamical transition
GW-driven, ~ point-mass+tidal
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Short-GRBsShort-GRBs
merger
inspiral GW-driven, ~ point-mass approx
shocks, violent dynamical transition
Post-mergerShort GRBs
GW signals
Paczynski 1986,Narayan et al. 1992
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Short-GRBsShort-GRBs
merger
inspiral GW-driven, ~ point-mass approx
shocks, violent dynamical transition
Post-mergerShort GRBs
GW signals
Paczynski 1986,Narayan et al. 1992 Strong B-feld?
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Short-GRBsShort-GRBs
Direct collapse to BH if MTOT
> Mmax
(Ω)
Formation of an unstable NS if Mmax
(Ω) > MTOT
> Mmax
Formation of an stable NS if MTOT
< Mmax
M max (Ω)=M max (1+αΩβ)
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Short-GRBsShort-GRBsStrong differential rotation → strongly twisted internal feld E
B≥1050 erg
Rosswog et al. (2003), Rosswog (2005), Rezzolla et al. (2011), Giacomazzo & Perna (2013), Giacomazzo et al. (2014)
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Short-GRBsShort-GRBs
2) Event Rate: How many BNS mergers?
a) distance of expected signals ≤ 35 Mpcb) estimated rate ~ 0.1-2 event/yr (cf. Abadie et al. 2010) c) fraction of stable NSs depends on EOS
Dall'Osso et al. (2015)
data from Kiziltan et al. (2013)
M rest=M g+0.075 M g2
Timmes et al. (1996)
1) Horizon with aLIGO/Virgo ~ 35 Mpc (Dall'Osso et al. 2015)
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Short-GRBsShort-GRBs
Dall'Osso et al. (2015)
Stable PMNSD ~ 35 Mpc
Hypermassive PMNSD ~ 16 Mpc
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Summary & ConclusionsSummary & Conclusions
Continuous Waves (CW): how much below the spin-down limit?Imprint of early history might be left in the crustal reference shape. Superconductivity can enhance the magnetic deformation. GW emission from LMXBs likely weaker than previously expected, butstrong input for studying the physics of Ns interiors.
GW bursts from SGRs: unlikely detection of GWs from f-mode;crustal/Alfven torsional modes much more promising, work in progress. Strength and geometry of the interior B-feld can play a signifcant role
GWs from GBRs: if ultra-magnetized, ms spinning NSs are formed incore-collapse and/or BNS mergers, and if the event rate is not belowcurrent “realistic-to-optimistic” estimates, then 1 to several newly bornmagnetars could be detected by aLIGO/Virgo in a few years of operationHigh computational costs: needs dedicated detection strategies