Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity...
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![Page 1: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/1.jpg)
Vacuum, Extreme Radial Velocity Experiment:VERVE
An instrument for ultra-precise radial velocity measurements
J. Kent Wallace (JPL)28 July 2015
![Page 2: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/2.jpg)
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Fellow Contributors
• Michael Randolph, LCHS• Rebecca Jensen-Clem, CIT• Gautam Vasisht, JPL• Phil Muirhead, BU• Lynne Hillenbrand, CIT• Erik Hovland, JPL• Richard Dekany, CIT
![Page 3: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/3.jpg)
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 4: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/4.jpg)
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 5: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/5.jpg)
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Radial Velocity Measurement OverviewTraditional
Spectroscopy
1In
tens
ity
Wavelength
Iodine spectral reference
Gratingspectrograph
The Goal
ΔRV=10cm/s
Δλ = 1x10-5Å
The Requirement:
Δλ = 2x10-6Å
The State of the Art: 70cm/s
![Page 6: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/6.jpg)
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Radial Velocity Measurement Overview Externally Dispersed Interferometry
(EDI)
2
spectralfringe.org
ScanningInterferometer
Tim
e
λ
Gratingspectrograph
Absorption lines
Moire pattern
Interferometertransmission comb
Traditional Spectroscopy
1In
tens
ity
Wavelength
Iodine spectral reference
Gratingspectrograph
![Page 7: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/7.jpg)
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One Pixel
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Image Credit: Phil Muirhead
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 9: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/9.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 10: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/10.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 11: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/11.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 12: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/12.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 14: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/14.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 15: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/15.jpg)
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 17: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/17.jpg)
One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
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One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
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1 km/s Doppler Shift
One Pixel
Flux
5499.91 5499.95 5500 5500.05 5500.09Wavelength [Å]
Rela
tive
Flux
Flux
Delay Change [μm]0.0 0.5 1.0 1.5 2.0 2.5
Image Credit: Phil Muirhead
![Page 21: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/21.jpg)
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 22: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/22.jpg)
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Instrument Description
BS2Grating
Fiber-Fed OAP
Lens
Imaging Array
Fold Mirror
BS1
Prism
Fold Mirror
PZT Flexure Stage
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Instrument Description
BS2Grating
Fiber-Fed OAP
Lens
Fold Mirror
BS1
Prism
Fold Mirror
PZT Flexure Stage
Imaging Array
![Page 24: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/24.jpg)
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 25: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/25.jpg)
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Preliminary Data
![Page 26: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/26.jpg)
Preliminary Data
![Page 27: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/27.jpg)
Preliminary Data
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Preliminary Data
![Page 29: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/29.jpg)
Preliminary Data
![Page 30: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/30.jpg)
Preliminary Data
![Page 31: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/31.jpg)
Preliminary Data
![Page 32: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/32.jpg)
Preliminary Data
![Page 33: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/33.jpg)
Preliminary Data
![Page 34: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/34.jpg)
Preliminary Data
![Page 35: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/35.jpg)
Preliminary Data
![Page 36: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/36.jpg)
Preliminary Data
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 38: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/38.jpg)
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Performance Predictions
The Palomar 200” telescope would take about 0.075 seconds to reach an SNR=8 resolution element, given the assumptions in the above tables. For 425 scans, each with 200 0.075 sec phase steps, the 200” telescope would require about 1.8 hours to reach a radial velocity precision of 10 cm/sec.
![Page 39: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/39.jpg)
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Outline
1. Radial Velocity Measurement Overview2. Instrument Description3. Preliminary Data4. Performance Predictions5. Conclusion
![Page 40: Vacuum, Extreme Radial Velocity Experiment: VERVE An instrument for ultra-precise radial velocity measurements J. Kent Wallace (JPL) 28 July 2015.](https://reader036.fdocuments.us/reader036/viewer/2022062720/56649f125503460f94c257d2/html5/thumbnails/40.jpg)
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Conclusion
• Radial velocity precision of 10 cm/sec appears achievable with externally dispersed interferometry.
• We are developing instrumentation to demonstrate this.
• Low-noise detectors are critical to demonstrating this new instrument.