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: http://www.stsci.edu/~inr/thisweek1/thisweek099.html
Дата изменения: Fri Jun 8 23:36:04 2007 Дата индексирования: Tue Oct 2 14:01:35 2012 Кодировка: Поисковые слова: jupiter |
| Program Number | Principal Investigator | Program Title | Links |
| 10166 | William Borucki, NASA Ames Research Center | ACS and WFPC2 Stellar Photometry in the Kepler Mission Target Field | Abstract |
| 10468 | Erich Karkoschka, University of Arizona | Jupiter's Upper Stratospheric Hazes Probed with Ganymede | Abstract |
| 10612 | Douglas Gies, Georgia State University | Binary Stars in Cyg OB2: Relics of Massive Star Formation in a Super-Star Cluster | Abstract |
| 10786 | Marc Buie, Lowell Observatory | Rotational state and composition of Pluto's outer satellites | Abstract |
| 10792 | Matthias Dietrich, The Ohio State University Research Foundation | Quasars at Redshift z=6 and Early Star Formation History | Abstract |
| 10798 | Leon Koopmans, Kapteyn Astronomical Institute | Dark Halos and Substructure from Arcs & Einstein Rings | Abstract |
| 10809 | Pieter van Dokkum, Yale University | The nature of dry mergers in the nearby Universe | Abstract |
| 10814 | Joel Bregman, University of Michigan | The Masses for ultraluminous X-ray sources | Abstract |
| 10827 | Gerard A. Kriss, Space Telescope Science Institute | Imaging Polarimetry of the Seyfert 1 MCG-6-30-15: Clues to the Structure of Warm Absorber | Abstract |
| 10839 | Dan Batcheldor Rochester Institute of Technology | The NICMOS Polarimetric Calibration | Abstract |
| 10847 | Dean Hines, Space Science Institute | Coronagraphic Polarimetry of HST-Resolved Debris Disks | Abstract |
| 10858 | Lin Yan, California Institute of Technology | NICMOS Imaging of the z ~ 2 Spitzer Spectroscopic Sample of Ultraluminous Infrared Galaxies | Abstract |
| 10862 | John Clarke, Boston University | Comprehensive Auroral Imaging of Jupiter and Saturn during the International Heliophysical Year | Abstract |
| 10872 | Harry Teplitz, California Institute of Technology | Lyman Continuum Emission in Galaxies at z=1.2 | Abstract |
| 10873 | Mark Whittle, The University of Virginia | The Radio-quiet Jet Flow in Markarian 34 | Abstract |
| 10877 | Weidong Li, University of California - Berkeley | A Snapshot Survey of the Sites of Recent, Nearby Supernovae | Abstract |
| 10880 | Henrique R. Schmitt, Naval Research Laboratory | The host galaxies of QSO2s: AGN feeding and evolution at high luminosities | Abstract |
| 10890 | Arjun Dey, NOAO | Morphologies of the Most Extreme High-Redshift Mid-IR-Luminous Galaxies | Abstract |
| 10907 | Scott Anderson, University of Washington | New Sightlines for the Study of Intergalactic Helium: A Dozen High-Confidence, UV-Bright Quasars from SDSS/GALEX | Abstract |
| 11082 | Christopher J. Conselice, University of Nottingham | NICMOS Imaging of GOODS: Probing the Evolution of the Earliest Massive Galaxies, Galaxies Beyond Reionization and the High Redshift Obscured Universe | Abstract |
| 11083 | Pat Cote, Herzberg Institute | The Structure, Formation and Evolution of Galactic Cores and Nuclei | Abstract |
| 11085 | Bill Sparks, Space Telescope Science Institute | Europa in Eclipse: Tenuous Atmosphere, Electromagnetic Activity and Surface Luminescence | Abstract |
GO 10166: ACS and WFPC2 Stellar Photometry in the Kepler Mission Target Field
The Kepler satellite |
Kepler, a NASA Discovery mission, is designed to search for extrasolar planets
by using high-precision photometric observations to detect transits. Scheduled
for launch in June 2008, Kepler
will continuously monitor ~100,000 (mainly) so lar-type stare within a
~100 square degree region in Cygnus. Ground-based observations have
successfully detected several transiting planets (e.g. HD 209458); all
are "hot jupiters", gas giants on short-period orbits which produce a
photometric dip of ~10-2 with a periopd of a few days.
In contrast, Kepler aims at detecting terrestrial planets within
the habitable zone, and therefore must detect photometric transit
signatures at the 10-4 level that last for 2-16 hours and recur
on timescales of 1-2 years. This is a challenging task. A subset of stellar binaries provide one of the main sources of confusion in searching for planetary transits, since "grazing" transits can mimic the planetary signature. This is particularly an issue with Kepler, since the optical system is designed to provide a broad psf, spreading the stellar flux over a large area on the detector to allow high photometric accuracy. As a result, faint eclipsing stellar binaries will contribute to the source counts. This program is using the high spatial resolution imaging provided by HST to study a small subset of the full Kepler target field to assess the likely statistical impact of these false positives. |
GO 10468: Jupiter's Upper Stratospheric Hazes Probed with Ganymede
Ganymede and Jupiter, as imaged by Cassini on 3 December 2000
|
Over the next week, Hubhle will use WFPC2 to take a series of images of Ganymede, catching the satellite as it slips into occultation behind Jupiter. The observations, in five different passbands spanning the ultraviolet (250 nm) to the far red (892 nm), will probe the upper layers of the parent planet's atmosphere, and permit investigation of the structure of haze within the Jovian stratosphere. Until now, studies of the creation, growth and motions of these layers has been limited to theoretical analyses; the WFPC2 images will provide the first empirical measurements of the aerosols responsible for the high haze. |
GO 10798: Dark Halos and Substructure from Arcs & Einstein Rings
Hubble imanges of Einstein ring gravitational lenses |
Gravitational lensing provides a powerful method of tracing the mass distribution of individual galaxies and galaxy clusters; at the same time, the amplified the light from background galaxies provides a means of probing the early stages of galaxy formation. The Sloan Digital Sky Survey (SDSS) has proven a powerful tool for identifying new lens candidates, although high angular resolution HST observations are essential for confirming those candidates as genuine gravitational lensing systems (see Program GO 10886). The present program focuses on that sample, targeting confirmed lenses for deep, multicolour imaging that aims to measure the overall mass distribution of the lens galaxies, and quantify the existence of small-scale sub-structure. The current cosmological paradigm, cold dark matter, predicts that sub-clustering within galactic halos should scale with increasing redshift; observations of lenses at different redshifts will serve to test this prediction. |
HST ACS/HRC coronagraphic images of debris disks around two nearby stars
|
The last decade has seen the identification of debris disks around a number of stars in the Solar neighbourhood. The coronagraphic capabilities available on HST have been particularly useful in this regards, since the lower background present in space-based observations offers significant advantages in detecting these low surface brightness features. Those observations are complemented by mid-infrared surveys (notably by Spitzer) of denser, warmer disks in young stars. The latter observations detect thermal emission from the dust grains, permitting some constraints to be set on the chemical composition. The present program aims to use polarimetric observations of debris disks to probe the distribution of grain sizes and the density distribution of dust in those somewhat older systems. NICMOS observations of the nearby M dwarf, AU Mic, and the F5 dwarf, HD 181327, are scheduled in the coming week. |