Max Planck Institute for Astronomy - Annual Report 2005

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102 IV. Instrumental Development IV.6 Differential Delay Lines for Prima Within a few years, the high-precision astrometric facility Prima (Phase Referenced Imaging and Microarcsecond Astrometry) will be available at the Very Large Telescope Interferometer (VLTI) of the European Southern Observatory. PriMa will be equipped with Differential Delay Lines (DDL), in order to perform high-precision astrometry at the 10 microarcsecond level. This precision enables the detection of extrasolar planets using the astrometric method, which is complementary to the radial velocity technique. In particular, the precise astrometry method can be used to search for planets around stars which are not suitable for the radial-velocity planet search programs. Astrometry allows a characterization of extrasolar planetary systems, because the mass of the planets can be determined by this technique. During the astrometric observations with PriMa, two stars will be observed simultaneously in a larger field of view (1 arc minute in diameter). If one of the stars is used as a reference, perturbations caused by atmospheric turbulence can be compensated for the other object in real time, leading to an increase in angular resolution and to a higher sensitivity. The MPIA Heidelberg, Geneva Observatory and Leiden Observatory are cooperating in a consortium that has agreed with Eso to build and deliver the Differential Delay Lines for PriMa, and then to carry out an astro- Fig. IV.6.1: Result of a Finite Element Analysis of the deformation by gravity forces and forces by the magnetic mount. The maximum deformation is 149 nm (red). 0.149 0.132 0.116 0.099 0.083 0.066 0.050 0.033 0.017 0 Total deformation [�m] x 10 cm y z Fig. IV.6.2: Optics of PRIMA DDL on a kinematic mount and subplates for adjustment. metric planet search program at the VLTI with the auxiliary telescopes in the near-infrared K-band. In the DDL project, the MPIA is primarily involved in the development of a high-precision, movable cat's eye telescope with an aperture of 20 cm driven by a linear motion mechanism and placed in a vacuum, the delay lines will compensate optical path differences of up to 12 cm with nanometer accuracy, corresponding to an accuracy of one part in 10 8 . In addition to this instrumentation project, the MPIA is also participating in the development of the astrometric operation software (AOS) and scientific preparatory programs for the astrometric observations. The MPIA is the leading partner in the preparatory observations for the planet search project with PriMa. The PriMa-DDL and AOS projects have successfully passed the preliminary design review, which was held at Eso Garching in June 2005. The final design review is foreseen for July 2006. (Harald Baumeister, Peter Bizenberger, Uwe Graser, Thomas Henning (Co-PI), Ralf Launhardt (Project Scientist, PM Optomechanics), Ralf-Rainer Rohloff, Johny Setiawan, Karl Wagner. Partners: Observatoire de Geneve, Sterrewacht Leiden)
IV.7 sPhErE – Search for Exoplanets at the VLT sPhErE, »Spectro-Polarimetric High-contrast Exoplanet Research«, is a project for direct imaging of extrasolar planets at the Eso-VLT. The project resulted from the merger of chEoPs and PLanEt finDEr, two competing feasibility studies for a corresponding VLT instrument. After the chEoPs consortium led by MPIA had officially lost the competition the scientific-technical advisory committee of Eso decided that both projects should be combined since essential parts of chEoPs were superior to the proposal presented by Laog (Grenoble). MPIA now is Co-PI institute of the sPhErE consortium comprising a total of 12 European institutes, including Eso. Phase B for sPhErE is now expected to start officially in March 2006. As with chEoPs a scientific program will be developed within sPhErE. With the resulting observing program being optimized on the basis of planet formation models, the spatial distribution of nearby stars as well as their age distribution, metallicity and so on, it should be possible to directly image several extrasolar gas planets of various ages (10 7 , 10 8 , and over 10 9 years old). The instrumental concept still includes an »extreme« adaptive optics system (Xao), and now three differential imaging components: the differential polarimeter ZiMPoL, a 3D nearinfrared spectrograph (both from the chEoPs concept), as well as an additional differential imaging nir-camera with spectrograph and polarimeter from the Laog proposal. For highest stability, the entire instrument will be fixed on the Nasmyth platform of the VLT. Phase B of the project is planned to last twelve months and will end with the preliminary design review. Phase C, until the final design review, is expected to take twelve months, too, whereas for construction, procurement and integration of the individual components 18 months are scheduled. First light is planned for the middle of 2010. (Markus Feldt) IV.8 Laiwo – Search for Exoplanets at Wise Observatory 103 IV.8 Laiwo – Search for Exoplanets at Wise Observatory Laiwo (Large Area Imager for the Wise Observatory) is an optical CCD camera that will be used to search for extrasolar Jupiter-like planets with the transit method. The camera will be mounted on the 1 m telescope at the Wise Observatory (Fig. IV.8.1) in the Negev Desert, Israel. The field of view will be one square degree with a resolution of 0.7 arcseconds per pixel. The MPIA, the University of Tel Aviv and the Göttingen Observatory initiated the Giant Transiting Planets Observations program funded by the MPIA and the German-Israeli Foundation. The aim of the research project is to detect extrasolar Jupiter-size planets around stars with magnitudes I � 14 – 15 using the transit method. This technique relies on the temporary drop in brightness of the parent star harboring the planet. If the planetary system is in a favorable orientation relative to the line of sight, then once per orbit, the planet passes between its star and the observer, causing an occultation or transit that results in a dip in the light curve. For Jupiter-size planets transiting a sun-size star, the expected dip or transit depth will be about 1 %. If three or more transits can be measured and confirmed to be caused by the same planet, the orbital period, the radius of the planet and the inclination angle of its orbital plane can be determined. Currently, Laiwo is being built at the MPIA. The camera will have four Lockheed CCD 486 devices with 4000 3 4000 pixels 15 microns in size (Fig. IV.8.2). The CCDs are frontside-illuminated with a quantum efficiency of about 40 % between 600 and 850 nm wavelength and a read-out noise below 5 electrons. There will be one guider CCD located at the center of the mosaic: an e2V CCD 47-20, 1K 3 1K frame transfer device, with a pixel size of 13 microns. The camera will be mounted on the 1m telescope of the Wise Observatory. The field of view will be one square degree with a resolution of 0.7 arcseconds. Fig. IV.8.1: The 1m telescope of the Wise Observatory in Israel.
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Max Planck Institute for Astronomy
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Contents Preface ..................
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6 I. General I.1 Scientific Goals U
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8 I. General massive protostars and
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10 I. General achieve higher angula
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12 I. General The institute is co-l
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14 I. General Point Source sensitiv
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16 I. General Edinburgh Groningen D
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18 II. Highlights II.1 Light Echoes
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20 II. Highlights 10 arcsec Fig. II
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22 II. Highlights AB Dor C AB Dor A
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24 II. Highlights II.3 The First He
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26 II. Highlights II.4 Planetesimal
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28 II. Highlights azimuthal directi
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30 II. Highlights ticles fall faste
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32 II. Highlights ANTU Seyfert 2 ga
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34 II. Highlights cretion disk, one
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36 II. Highlights 8.5 �m 2.3 ly 0
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38 II. Highlights II.6 Massive Star
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40 II. Highlights log M� /pc2 �
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42 II. Highlights II.7 Observations
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44 II. Highlights log IR luminosity
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46 II.8 Dynamics, Dust, and Young S
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48 II. Highlights and we see a temp
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50 III. Selected Research Areas III
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Page 56 and 57: 54 III. Scientific Work the Data Ar
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Page 90 and 91: 88 IV. Instrumental Development All
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Page 146 and 147: 144 Staff Directors: Henning (Actin
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Page 150 and 151: 148 Cooperation with industrial Fir
Page 152 and 153: 150 Conferences Conferences and Mee
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152 Conferences D. Lemke: JWST-miri
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154 Conferences/Service in Comitees
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156 Publications Szalay, I. Szapudi
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158 Publications Hamilton, C. M., W
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160 Publications Brinkmann, D. G. Y
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162 Publications Zheng, X. Z., F. H
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164 Publications of the wheel mecha
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166 Publications ASP Conf. Ser. 331
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The Max Planck Society The Max Plan
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