Download Inspiral Group Report: S1 Preliminary Report

Virgo detector, Cascina, Italy
What is LIGO (LSC/GEO/Virgo/…)?
Gabriela González,
Louisiana State University
For the LIGO Scientific Collaboration and
the Virgo Collaboration
LIGO Livingston Observatory,
Louisiana, USA
LIGO-GXX
LIGO Hanford Observatory
Washington, USA
Gravitational waves
Gravitational waves are quadrupolar distortions of
distances between freely falling masses. They are
produced by time-varying mass quadrupoles.
8pG
Gmn = 4 Tmn (= 0 in vacuum)
c
gmn = hmn + hmn
+, x and averaged strain sensitivity
LIGO-T970101
LIGO-GXX
2
Not a simple Michelson
interferometer!
Rep. Prog. Phys. 72 (2009) 076901
arXiv:0711.3041200711
LIGO: The Laser Interferometer
Gravitational-Wave Observatory
LIGO-GXX
3
Interferometer Noise
Seismic Noise
test mass (mirror)
Quantum Noise
Residual gas scattering
"Shot" noise
Radiation
pressure
LASER
beamsplitter
Wavelength
& amplitude
fluctuations
LIGO-GXX
photodiode
Thermal
(Brownian)
Noise
4
(LIGO) Design Noise Limits
LIGO-GXX
5
LIGO: Steady progress
hrms = 3 10-22
LIGO-GXX
GW detector network 2002-2006
LIGO-Hanford,WA
X2
GEO-600
Hannover
Germany
TAMA300
LIGO-Livingston,LA
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
7
LIGO Scientific Collaboration
www.ligo.org
Hundreds (800+) of people
working on technology for
LIGO detectors, producing
and analyzing the
LIGO/GEO data.
Science results
LIGO-GXX
NSHP/NSBP Conference
8
GW detector network 2005-2010
LIGO-Hanford,WA
X2
LIGO-Livingston,LA
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
GEO-600
Hannover, Germany
VIRGO
Cascina, Italy
9
LSC S5 run (Nov’05-Oct’07)
With a 15 Mpc average reach, we expected ~ 1 BNS coalescence every ~50 yrs 
We were not lucky: data analysis did not find any detections (ligo.org),
although we did have a ghost!
Predicted observation rates: Class. Quantum Grav. 27 (2010) 173001
S5 (and all) papers in https://www.lsc-group.phys.uwm.edu/ppcomm/Papers.html
LIGO-GXX
NSHP/NSBP Conference
10
“initial” GW network searches
Crab pulsar (NASA, Chandra
Observatory)
NASA, WMAP
?
LIGO-GXX
NASA,
HEASARC
Find all LSC results and publications in www.ligo.org
https://www.lsc-group.phys.uwm.edu/ppcomm/Papers.html
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Enhanced GW detector network 2007-2010
LIGO-Hanford,WA
X2
LIGO-Livingston,LA
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
GEO-600
Hannover, Germany
VIRGO
Cascina, Italy
12
2009/10: Enhanced LIGO, Virgo+
+ EM partners
LIGO-GXX
2005-2010:
binary neutron star reach
S6
S5
Nucl. Instrum. Meth. A624 (2010) 223
LIGO-GXX
NSHP/NSBP Conference
14
Observing Partners During
S6/VSR2+3
Radio
X-ray and
UV/Optical
•
Mostly (but not all) robotic wide-field optical telescopes
 Mainly used for following up GRBs, surveying for supernovae and other optical transients
 "Implementation and testing of the first prompt search for electromagnetic counterparts to
gravitational wave transients” http://arxiv.org/abs/1109.3498
LIGO-GXX
15
“Big Dog event”
http://ligo.org/news/blind-injection.php
Data from a 3-detector network localized the source (very roughly) near Canis Major.
Practiced a system to follow up triggers with EM telescopes/satellites.
You can get the detector data and other details: http://ligo.org/science/GW100916/
LIGO-GXX
NSHP/NSBP Conference
16
GWs or glitches?
H1 S6D,
offline vetoes
LIGO-GXX
17
GW detector network
2011-2014
GEO-600
Hannover, Germany
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
Present: Advanced LIGO detectors
Funding in place, installation already in progress, end of construction in 2015.
NOW
MREFC Funding Start
FY07
FY08
FY09
FY10
FY11
Acceptance
Date
FY12
FY13
FY14
Acceptance NSF Date
FY15
Design and Development
Fabrication
De-Install / Installation
Construction
Project
Testing and Integration
Interferometer Acceptances
Project End
Science and Engineering Runs
19
LIGO-GXX
GW detector network 2015
LIGO-Hanford,WA
X 2?
(LIGO: 1-hr lock
- ??? Mpc)
LIGO-Livingston,LA
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
GEO-600
Hannover, Germany
Projected Noise Spectra
Orientation-averaged
detection range for
binary inspirals
NS-NS
BH-BH
(30 M)
No
SRM
150 Mpc
1.60 Gpc
0-det
low P
145 Mpc
1.65 Gpc
0-det
high P
190 Mpc
1.85 Gpc
NS-NS
tuned
200 Mpc
1.65 Gpc
case
Advanced LIGO shown; Advanced Virgo similar
Best guess: will detect
dozens per year
• Factor of ~10 better amplitude sensitivity than initial
detectors
 Factor of ~1000 greater volume of space
LIGO-GXX
21
LIGO detectors: near future!
Neutron Star Binaries:
Initial LIGO: ~15 Mpc  rate ~1/50yrs
Advanced LIGO: ~ 200 Mpc
“Realistic rate” ~ 40/year
Class. Quant. Grav. 27, 173001 (2010)
LIGO-GXX
22
(LIGO) Open data release plan
LIGO data management plan (public) LIGO-M1000066 (dcc.ligo.org)
2010
2011
2012
2013
L1
2014
H2
2015
2016
2017
2018
2019
H1
2.5 years
S6
Release 2B: Full Data
SE1
SE2
SE3
SE4
SE5
SE6
Engineering Runs
NOW
Release 2A: Immediate Triggers
Release 1: First Detections
Dates are “guaranteed no earlier”
LIGO-GXX
23
GW detector network 2015+
LIGO-Hanford,WA
X 2?
LIGO-Livingston,LA
http://www.oera.net/How2/PlanetTexs/
LIGO-GXX
GEO-600
Hannover, Germany
VIRGO
Cascina, Italy
LCGT
Kamioka mine, Japan
LIGO-India?
24
Other GW windows
/ Virgo
LIGO-GXX
25