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NEAR : New Earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4)
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- Kaeufl, Hans Ulrich (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Kasper, Markus (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Arsenaut, Robin (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Jakob, Gerd (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Leveratto, Serban (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany;Delft Univ Technol, Postbus 5, NL-2600 AA Delft, Netherlands
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- Zins, Gerard (författare)
- European Southern Observ, Alonso de Cordoba 3107, Santiago 7630355, Chile
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- Fuenteseca, Eloy (författare)
- European Southern Observ, Alonso de Cordoba 3107, Santiago 7630355, Chile
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- Riquelme, Miguel (författare)
- European Southern Observ, Alonso de Cordoba 3107, Santiago 7630355, Chile
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- Siebenmorgen, Ralf (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Sterzik, Michael (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85746 Garching, Germany
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- Ageorges, Nancy (författare)
- Kampf Teleskop Opt, Alois Gilg Weg 7, D-81373 Munich, Germany
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- Gutruf, Sven (författare)
- Kampf Teleskop Opt, Alois Gilg Weg 7, D-81373 Munich, Germany
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- Kampf, Dirk (författare)
- Kampf Teleskop Opt, Alois Gilg Weg 7, D-81373 Munich, Germany
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- Reutlinger, Arnd (författare)
- Kampf Teleskop Opt, Alois Gilg Weg 7, D-81373 Munich, Germany
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- Absil, Olivier (författare)
- Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Bat B5c, B-4000 Sart Tilman Par Liege, Belgium
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- Carlomagno, Brunella (författare)
- Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Bat B5c, B-4000 Sart Tilman Par Liege, Belgium
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- Guyon, Olivier (författare)
- Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA
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- Klupar, Pete (författare)
- Breakthrough Initiat, 3000 Sand Hill Rd,4-180, Menlo Pk, CA 94025 USA
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- Mawet, Dimitri (författare)
- Dept Astron, MC 249-17 Caltech,1200 E Calif Blvd, Pasadena, CA 91125 USA;CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
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- Ruane, Garreth (författare)
- Dept Astron, MC 249-17 Caltech,1200 E Calif Blvd, Pasadena, CA 91125 USA
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- Karlsson, Mikael (författare)
- Uppsala universitet,Tillämpad materialvetenskap
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- Pantin, Eric (författare)
- CEA Saclay, Orme Merisiers Bat 709, F-91191 Gif Sur Yvette, France
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- Dohlen, Kjetil (författare)
- LAM, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France
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(creator_code:org_t)
- SPIE, 2018
- 2018
- Engelska.
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Ingår i: Ground-Based And Airborne Instrumentation For Astronomy VII. - : SPIE. - 9781510619586
- Relaterad länk:
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https://authors.libr...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- ESO in collaboration with the Breakthrough Initiatives, is adding a dedicated coronagraph to the Very Large Telescope mid-IR imager (VISIR) to further boost the high dynamic range imaging capability of this instrument. After the VISIR upgrade in 2012, where coronagraphic masks were first added to VISIR, it became evident that coronagraphy at a ground-based 8m-class telescope, even at wavelengths as long as 10 mu m, critically needs adaptive optics. For VISIR, a work-horse observatory facility instrument in normal operations, this is "easiest" achieved by bringing VISIR as a visiting instrument to the ESO-VLT-UT4 having an adaptive M2. This "visit" enables a meaningful search for Earth-like planets in the habitable zone around both alpha-Cen(1) and alpha-Cen(2). Meaningful here means, achieving a contrast of approximate to 10(-6) within approximate to 0.8 arcsec from the star. Various measures to improve the sensitivity of VISIR will be applied, especially a dedicated filter, faster chopping and a Strehl-ratio close to 100% thanks to extreme adaptive optics. This should allow to detect a planet twice the diameter of Earth in 50 h on source integration time. Key components will be a diffractive coronagraphic mask, the annular groove phase mask (AGPM), optimized for the most sensitive spectral band-pass in the N-band, complemented by a sophisticated apodizer at the level of the Lyot stop. For VISIR noise filtering based on fast chopping is required. A novel internal chopper system will be integrated into the cryostat. This chopper is based on the standard technique from early radio astronomy, conceived by the microwave pioneer Robert Dicke in 1946, which was instrumental for the discovery of the 3K microwave background. For risk mitigation all components are being tested and quali fi ed under realistic conditions in the lab at ESO headquarters before integration into the instrument. The performance or suppression of the coronagraph is so good, that a non-thermal source (vulgo a laser) is needed on the test-bench. We will give an overview of the optical changes to VISIR, the implementation of wave front sensing, the Dicke switch design and laboratory testing, the AGPM design and laboratory testing, non common path error control with a ZELDA mask, sensitivity and contrast estimates, data flow and analysis, the overall project status, plan and outlook Needless to say that this project is of critical interest for future infrared instrumentation at the next generation of extremely large telescopes aiming at surveying the solar neighborhood for terrestrial planets by detecting and characterizing them based on their mid-IR fluxes.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- exo-Earth
- alpha-Cen
- habitable zone
- coronagraphy
- apodization
- extreme AO
- thermal infrared
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Kaeufl, Hans Ulr ...
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Kasper, Markus
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Arsenaut, Robin
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Jakob, Gerd
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Leveratto, Serba ...
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Zins, Gerard
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Fuenteseca, Eloy
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Riquelme, Miguel
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Siebenmorgen, Ra ...
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Sterzik, Michael
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Ageorges, Nancy
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Gutruf, Sven
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Kampf, Dirk
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Reutlinger, Arnd
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Absil, Olivier
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Carlomagno, Brun ...
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Guyon, Olivier
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Klupar, Pete
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Mawet, Dimitri
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Ruane, Garreth
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Karlsson, Mikael
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Pantin, Eric
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Dohlen, Kjetil
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