Abstract
We discuss data reduction techniques and results from the Simultaneous Differential Imager (SDI) implemented at the VLT (Lenzen et al. 2004a) and the MMT. SDI uses a quad filter to take images simultaneously at 3 wavelengths surrounding the 1.62 μm methane bandhead found in the spectrum of cool brown dwarfs and gas giants. By performing a difference of images in these filters, speckle noise from the primary can be attenuated by a factor of >10 2. Non-trivial data reduction tools are necessary to pipeline the simultaneous differential imaging. Here we discuss a custom algorithm implemented in IDL to perform this reduction. The script performs basic data reduction tasks but also precisely aligns images taken in each of the filters using a custom shift and subtract routine. In our commissioning runs at the VLT and MMT, we achieved contrasts up to a factor of 45000 (ΔH=11.7) at a separation of 0.6" from the primary star. With this degree of attenuation, we should be able to image a 2-4 Jupiter mass planet at 5 AU around a 30 Myr star at 10 pc. We believe that our SDI images are the highest contrast astronomical images ever made from ground or space.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Editors | D.B. Calia, B.L. Ellerbroek, R. Ragazzoni |
| Pages | 389-397 |
| Number of pages | 9 |
| Volume | 5490 |
| Edition | PART 1 |
| DOIs | |
| State | Published - 2004 |
| Event | Advancements in Adaptive Optics - Glasgow, United Kingdom Duration: Jun 21 2004 → Jun 25 2004 |
Other
| Other | Advancements in Adaptive Optics |
|---|---|
| Country | United Kingdom |
| City | Glasgow |
| Period | 6/21/04 → 6/25/04 |
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Keywords
- Adaptive optics
- Extrasolar planets
- High contrast imaging
- Simultaneous differential imaging
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
Cite this
Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT. / Biller, B. A.; Close, Laird M; Lenzen, R.; Brandner, W.; Mccarthy, Donald W; Nielsen, E.; Hartung, M.
Proceedings of SPIE - The International Society for Optical Engineering. ed. / D.B. Calia; B.L. Ellerbroek; R. Ragazzoni. Vol. 5490 PART 1. ed. 2004. p. 389-397 136.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT
AU - Biller, B. A.
AU - Close, Laird M
AU - Lenzen, R.
AU - Brandner, W.
AU - Mccarthy, Donald W
AU - Nielsen, E.
AU - Hartung, M.
PY - 2004
Y1 - 2004
N2 - We discuss data reduction techniques and results from the Simultaneous Differential Imager (SDI) implemented at the VLT (Lenzen et al. 2004a) and the MMT. SDI uses a quad filter to take images simultaneously at 3 wavelengths surrounding the 1.62 μm methane bandhead found in the spectrum of cool brown dwarfs and gas giants. By performing a difference of images in these filters, speckle noise from the primary can be attenuated by a factor of >10 2. Non-trivial data reduction tools are necessary to pipeline the simultaneous differential imaging. Here we discuss a custom algorithm implemented in IDL to perform this reduction. The script performs basic data reduction tasks but also precisely aligns images taken in each of the filters using a custom shift and subtract routine. In our commissioning runs at the VLT and MMT, we achieved contrasts up to a factor of 45000 (ΔH=11.7) at a separation of 0.6" from the primary star. With this degree of attenuation, we should be able to image a 2-4 Jupiter mass planet at 5 AU around a 30 Myr star at 10 pc. We believe that our SDI images are the highest contrast astronomical images ever made from ground or space.
AB - We discuss data reduction techniques and results from the Simultaneous Differential Imager (SDI) implemented at the VLT (Lenzen et al. 2004a) and the MMT. SDI uses a quad filter to take images simultaneously at 3 wavelengths surrounding the 1.62 μm methane bandhead found in the spectrum of cool brown dwarfs and gas giants. By performing a difference of images in these filters, speckle noise from the primary can be attenuated by a factor of >10 2. Non-trivial data reduction tools are necessary to pipeline the simultaneous differential imaging. Here we discuss a custom algorithm implemented in IDL to perform this reduction. The script performs basic data reduction tasks but also precisely aligns images taken in each of the filters using a custom shift and subtract routine. In our commissioning runs at the VLT and MMT, we achieved contrasts up to a factor of 45000 (ΔH=11.7) at a separation of 0.6" from the primary star. With this degree of attenuation, we should be able to image a 2-4 Jupiter mass planet at 5 AU around a 30 Myr star at 10 pc. We believe that our SDI images are the highest contrast astronomical images ever made from ground or space.
KW - Adaptive optics
KW - Extrasolar planets
KW - High contrast imaging
KW - Simultaneous differential imaging
UR - http://www.scopus.com/inward/record.url?scp=11144314732&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11144314732&partnerID=8YFLogxK
U2 - 10.1117/12.552164
DO - 10.1117/12.552164
M3 - Conference contribution
AN - SCOPUS:11144314732
VL - 5490
SP - 389
EP - 397
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Calia, D.B.
A2 - Ellerbroek, B.L.
A2 - Ragazzoni, R.
ER -