All Figures

$\begin{figure} \par\includegraphics[width=17cm,clip]{7582fig1.eps} \end{figure}$ Figure 1: Overview of the ALADDIN infrastructure. A 40-m rotating truss bearing the siderostats is mounted on a 30-m high structure (not represented). The light beams collected by the two siderostats are fed into off-axis telescopes and routed towards the nulling instrument cryostat by fixed relay optics (only five reflections outside the cryostat).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig2.eps}} \end{figure}$ Figure 2: Block diagram of the ALADDIN optical architecture. Feed-back signals driving the control of the tip-tilt and OPD parameters are shown in dashed lines. The entrance windows of the cold enclosure are not represented, for simplicity.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig3.eps}} \end{figure}$ Figure 3: Simulated performance of ALADDIN in terms of exozodiacal disc detection for four typical Darwin targets. The baseline design for ALADDIN has been used (see Table 3), assuming an integration time of 30 min, an uncertainty of 1% on the knowledge of the stellar angular diameter, and using the worst-case scenario for atmospheric turbulence (see text). The two vertical lines indicate the baseline range proposed for the ALADDIN conceptual design.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig4.eps}} \end{figure}$ Figure 4: Simulated performance of ALADDIN in terms of exozodiacal disc detection for various assumptions on the uncertainty on the stellar angular diameters.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig5.eps}} \end{figure}$ Figure 5: Simultaneous fit of the stellar radius and the exozodiacal density level using ten 30-min observations of a K0V star at 5 pc (actual radius of $0.85~ R_{\odot}$ ), surrounded by a 50-zodi disc. The nulling ratio is computed as the ratio between the destructive and constructive outputs of the beam combiner. The contribution of instrumental stellar leakage to the nulling ratio has been subtracted from this data using the same procedure than elaborated for GENIE: the observation of a calibration target of similar type and distance, but without circumstellar material.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig6.eps}} \end{figure}$ Figure 6: Simulated performance of ALADDIN in terms of exozodiacal disc detection for increasing integration times.
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In the text

$\begin{figure} \par\resizebox{8.5cm}{!}{\includegraphics{7582fig7.eps}} \end{figure}$ Figure 7: Simulated performance of ALADDIN in terms of exozodiacal disc detection for three different pupil diameters (50 cm, 1 m and 2 m).
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{7582fig1.eps} \end{figure}$	Figure 1: Overview of the ALADDIN infrastructure. A 40-m rotating truss bearing the siderostats is mounted on a 30-m high structure (not represented). The light beams collected by the two siderostats are fed into off-axis telescopes and routed towards the nulling instrument cryostat by fixed relay optics (only five reflections outside the cryostat).
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig2.eps}} \end{figure}$	Figure 2: Block diagram of the ALADDIN optical architecture. Feed-back signals driving the control of the tip-tilt and OPD parameters are shown in dashed lines. The entrance windows of the cold enclosure are not represented, for simplicity.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig4.eps}} \end{figure}$	Figure 4: Simulated performance of ALADDIN in terms of exozodiacal disc detection for various assumptions on the uncertainty on the stellar angular diameters.
Open with DEXTER

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{7582fig6.eps}} \end{figure}$	Figure 6: Simulated performance of ALADDIN in terms of exozodiacal disc detection for increasing integration times.
Open with DEXTER

$\begin{figure} \par\resizebox{8.5cm}{!}{\includegraphics{7582fig7.eps}} \end{figure}$	Figure 7: Simulated performance of ALADDIN in terms of exozodiacal disc detection for three different pupil diameters (50 cm, 1 m and 2 m).
Open with DEXTER