TIMMI2 ESO's Thermal Infrared Multimode Instrument: Technical Description and Some Scientific Results

Käufl, H. U.; Sterzik, M.; Siebenmorgen, R.; Weilenmann, U.; Relke, H.; Hron, J.; Sperl, M.

doi:10.1117/12.460335

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The observations were carried out on 2001 October 9 and 10, using the imaging mode of TIMMI2 (Reimann et al 2000;Käufl et al 2003) attached to the ESO 3.6m telescope (La Silla, Chile). TIMMI2 has an array of 320 × 240 pixels with a pixel scale of 0.2 ′′ × 0.2 ′′ resulting in a field of view of 64 ′′ × 48 ′′ .…”

Section: Mid-infrared Observationsmentioning

confidence: 99%

Revealing the Mid‐Infrared Emission Structure of IRAS 16594−4656 and IRAS 07027−7934

García-Hernández¹,

Manchado²,

García-Lario³

et al. 2006

ApJ

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TIMMI2 diffraction-limited mid-infrared images of a multipolar protoplanetary nebula IRAS 16594−4656 and a young [WC] elliptical planetary nebula IRAS 07027−7934 are presented. Their dust shells are for the first time resolved (only marginally in the case of IRAS 07027−7934) by applying the Lucy-Richardson deconvolution algorithm to the data, taken under exceptionally good seeing conditions (≤0.5 ′′ ). IRAS 16594−4656 exhibits a two-peaked morphology at 8.6, 11.5 and 11.7 µm which is mainly attributed to emission from PAHs. Our observations suggest that the central star is surrounded by a toroidal structure observed edge-on with a radius of 0.4 ′′ (∼640 AU at an assumed distance of 1.6 kpc) with its polar axis at P.A.∼80 • , coincident with the orientation defined by only one of the bipolar outflows identified in the HST optical images. We suggest that the material expelled from the central source is currently being collimated in this direction and that the multiple outflow formation has not been coeval. IRAS 07027−7934 shows a bright, marginally extended emission (FWHM=0.3 ′′ ) in the mid-infrared with a slightly elongated shape along the N-S direction, consistent with the morphology detected by HST in the near-infrared. The mid-infrared emission is interpreted as the result of the combined contribution of small, highly ionized PAHs and relatively hot dust continuum. We propose that IRAS 07027−7934 may have recently experienced a thermal pulse (likely at the end of the AGB) which has produced a radical change in the chemistry of its central star.

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Section: Mid-infrared Observationsmentioning

confidence: 99%

Revealing the Mid‐Infrared Emission Structure of IRAS 16594−4656 and IRAS 07027−7934

García-Hernández¹,

Manchado²,

García-Lario³

et al. 2006

ApJ

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“…at wavelengths from 8 to 24µm dating back to 1980. 1 The last two instruments in this row, TIMMI2 2,3 and VISIR 4 are instrumental for the NEAR project. TIMMI2 has been retired from ESO's 3.6m telescope in 2007 and serves as detector test facility at ESO's headquarters in Garching.…”

Section: Introductionmentioning

confidence: 99%

NEAR: New Earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4)

Käufl¹,

Kasper²,

Arsenault³

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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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 10µm, 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 α-Cen 1 and α-Cen 2. Meaningful here means, achieving a contrast of ≈ 10 −6 within ≈ 0.8arcsec 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 50h 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.

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Thermal infrared and optical photometry of Asteroidal Comet C/2002 CE10

Sekiguchi

Miyasaka

Dermawan

et al. 2018

Icarus

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C/2002 CE 10 is an object in a retrograde elliptical orbit with Tisserand parameter −0.853 indicating a likely origin in the Oort Cloud. It appears to be a rather inactive comet since no coma and only a very weak tail was detected during the past perihelion passage. We present multi-color optical photometry, lightcurve and thermal mid-IR observations of the asteroidal comet. With the photometric analysis in BVRI, the surface color is found to be redder than asteroids, corresponding to cometary nuclei and TNOs/Centaurs. The time-resolved differential photometry supports a rotation period of 8.19±0.05 h. The effective diameter and the geometric albedo are 17.9±0.9 km and 0.03±0.01, respectively, indicating a very dark reflectance of the surface. The dark and redder surface color of C/2002 CE 10 may be attribute to devolatilized material by surface aging suffered from the irradiation by cosmic rays or from impact by dust particles in the Oort Cloud. Alternatively, C/2002 CE 10 was formed of very dark refractory material originally like a rocky planetesimal. In both cases, this object lacks ices (on the surface at least). The dynamical and known physical characteristics of C/2002 CE 10 are best compatible with those of the Damocloids population in the Solar System, that appear to be exhaust cometary nucleus in Halley-type orbits. The study of physical properties of rocky Oort cloud objects may give us a key for the formation of the Oort cloud and the solar system.

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TIMMI2 ESO's Thermal Infrared Multimode Instrument: Technical Description and Some Scientific Results

Cited by 4 publications

References 9 publications

Revealing the Mid‐Infrared Emission Structure of IRAS 16594−4656 and IRAS 07027−7934

Revealing the Mid‐Infrared Emission Structure of IRAS 16594−4656 and IRAS 07027−7934

NEAR: New Earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4)

Thermal infrared and optical photometry of Asteroidal Comet C/2002 CE10

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