Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT

B. A. Biller, Laird M Close, R. Lenzen, W. Brandner, Donald W Mccarthy, E. Nielsen, M. Hartung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

33 Citations (Scopus)

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 languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsD.B. Calia, B.L. Ellerbroek, R. Ragazzoni
Pages389-397
Number of pages9
Volume5490
EditionPART 1
DOIs
StatePublished - 2004
EventAdvancements in Adaptive Optics - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004

Other

OtherAdvancements in Adaptive Optics
CountryUnited Kingdom
CityGlasgow
Period6/21/046/25/04

Fingerprint

Extrasolar planets
extrasolar planets
Speckle
Image sensors
Data reduction
Imaging techniques
Stars
data reduction
Planets
filters
Methane
Pipelines
stars
Wavelength
Jupiter (planet)
Gases
planets
methane
attenuation
shift

Keywords

  • Adaptive optics
  • Extrasolar planets
  • High contrast imaging
  • Simultaneous differential imaging

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Biller, B. A., Close, L. M., Lenzen, R., Brandner, W., Mccarthy, D. W., Nielsen, E., & Hartung, M. (2004). Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT. In D. B. Calia, B. L. Ellerbroek, & R. Ragazzoni (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (PART 1 ed., Vol. 5490, pp. 389-397). [136] https://doi.org/10.1117/12.552164

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 proceedingConference contribution

Biller, BA, Close, LM, Lenzen, R, Brandner, W, Mccarthy, DW, Nielsen, E & Hartung, M 2004, Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT. in DB Calia, BL Ellerbroek & R Ragazzoni (eds), Proceedings of SPIE - The International Society for Optical Engineering. PART 1 edn, vol. 5490, 136, pp. 389-397, Advancements in Adaptive Optics, Glasgow, United Kingdom, 6/21/04. https://doi.org/10.1117/12.552164
Biller BA, Close LM, Lenzen R, Brandner W, Mccarthy DW, Nielsen E et al. Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT. In Calia DB, Ellerbroek BL, Ragazzoni R, editors, Proceedings of SPIE - The International Society for Optical Engineering. PART 1 ed. Vol. 5490. 2004. p. 389-397. 136 https://doi.org/10.1117/12.552164
Biller, B. A. ; Close, Laird M ; Lenzen, R. ; Brandner, W. ; Mccarthy, Donald W ; Nielsen, E. ; Hartung, M. / Suppressing speckle noise for simultaneous differential extrasolar planet imaging (SDI) at the VLT and MMT. Proceedings of SPIE - The International Society for Optical Engineering. editor / D.B. Calia ; B.L. Ellerbroek ; R. Ragazzoni. Vol. 5490 PART 1. ed. 2004. pp. 389-397
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