218 research outputs found
Fleur de Sel" Etudes Numéro 2
The major aim of this practice-based research project is to explore the ways in which the adoption of certain aesthetic filmmaking devices, can shift the focus of documentary film away from exposition and more toward one of expression. Poetic documentaries are more concerned with creating a lyrical impression, rather than imparting knowledge or information about specific events, people or places. The way in which the editing structures the images in particular ways, can be called an associational form, whereby images are sequenced not for the purpose of continuity, rather are sequenced in particular ways, in order to explore patterns and associations based on their spatial, temporal properties. It is a style of documentary filmmaking that appeals to the sensorial over the cognitive.
The submission consists of a documentary film, accompanying research statement and statement in reply to peer review
The Onset of Methane in L Dwarfs
We have detected weak absorption features produced by the strong nu(3)
methane band at 3.3 microns in two L dwarfs, 2MASSW J1507476-162738 and 2MASSI
J0825196+211552, classified by Kirkpatrick et al. (2000) as spectral types L5
and L7.5 respectively. These absorptions occur in objects warmer than any in
which methane previously has been detected, and mark the first appearance of
methane in the ultracool star-to-brown dwarf spectral sequence.Comment: 12 pages, 2 figures; accepted by ApJ Letter
L-Band Photometry of L and T Dwarfs
We present K- and L-band photometry obtained with the Keck I telescope for a
representative sample of L and T dwarfs. These observations were motivated in
part by the dominant role water and methane play in shaping the flux near 2 and
3 microns and by the potential use of these bands as indicators of spectral
class in the infrared. In addition, these observations aid the determination of
the bolometric luminosity of L and T dwarfs. Here we report the K, L' and Ls
magnitudes of our objects and the trends observed in the (K-L') and (K-Ls)
colors as a function of L- and T-dwarf spectral class. We compare these colors
with theoretical models, derive a relationship between effective temperature
and L-spectral class, and compare our temperature estimates with others.Comment: Paper to be published in ApJL, 15 pages, 3 figure
Listen to Nice
In describing Humphrey Jenningsâ wartime documentary propaganda film, 'Listen to Britain' (1942), a film with an overtly poetic sensibility and dominantly musical soundtrack, John Corner asserts that âthrough listening to
Britain, we are enabled to properly look at it'. This idea of sound leading our attention to the images has underpinned much of the collaborative
work between composer and sound designer, Geoffrey Cox, and documentary filmmaker, Keith Marley. It is in this context that the article will analyse an extract of A Film About Nice (Marley and Cox 2010), a contemporary
re-imagining of Jean Vigoâs silent documentary, 'A propos de Nice' (1930). Reference will be made throughout to the historical context, and the filmic and theoretical influences that have informed the way music and creative sound design have been used to place emphasis on hearing a place, as much as seeing it
ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres
AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that
has the lowest dynamical mass among directly imaged exoplanets. We present an
in-depth analysis of the atmospheric composition of the star and planet to
probe the planet's formation pathway. Based on new high-resolution spectroscopy
of AF Lep A, we measure a uniform set of stellar parameters and elemental
abundances (e.g., [Fe/H] = dex). The planet's dynamical mass
( M) and orbit are also refined using published
radial velocities, relative astrometry, and absolute astrometry. We use
petitRADTRANS to perform chemically-consistent atmospheric retrievals for AF
Lep b. The radiative-convective equilibrium temperature profiles are
incorporated as parameterized priors on the planet's thermal structure, leading
to a robust characterization for cloudy self-luminous atmospheres. This novel
approach is enabled by constraining the temperature-pressure profiles via the
temperature gradient , a departure from previous studies
that solely modeled the temperature. Through multiple retrievals performed on
different portions of the m spectrophotometry, along with
different priors on the planet's mass and radius, we infer that AF Lep b likely
possesses a metal-enriched atmosphere ([Fe/H] dex). AF Lep b's
potential metal enrichment may be due to planetesimal accretion, giant impacts,
and/or core erosion. The first process coincides with the debris disk in the
system, which could be dynamically excited by AF Lep b and lead to planetesimal
bombardment. Our analysis also determines K,
dex, and the presence of silicate clouds and
dis-equilibrium chemistry in the atmosphere. Straddling the L/T transition, AF
Lep b is thus far the coldest exoplanet with suggested evidence of silicate
clouds.Comment: AJ, in press. Main text: Pages 1-32, Figures 1-15, Tables 1-6. All
figures and tables after References belong to the Appendix (Pages 32-58,
Figures 16-20, Table 7). For supplementary materials, please refer to the
Zenodo repository https://doi.org/10.5281/zenodo.826746
A search for starlight reflected from upsilon And's innermost planet
In data from three clear nights of a WHT/UES run in 2000 Oct/Nov, and using
improved Doppler tomographic signal-analysis techniques, we have carried out a
deep search for starlight reflected from the innermost of upsilon And's three
planets. We place upper limits on the planet's radius R_p as functions of its
projected orbital velocity K_p ~ 139 sin i km/sec for various assumptions about
the wavelength-dependent geometric albedo spectrum p(\lambda) of its
atmosphere. For a grey albedo p we find R_p \sqrt{p} < 0.98 R_Jup with 0.1
percent false-alarm probability (4-sigma). For a Sudarsky et al (2000) Class V
model atmosphere, the mean albedo in our 380-676 nm bandpass is ~ 0.42,
requiring R_p ~ 0.19
requires R_p < 2.23 R_Jup. The star's v sin{i} ~ 10 km/sec and estimated
rotation period P_{rot} ~ 10 d suggest a high orbital inclination i ~ 70-80
degrees. We also develop methods for assessing the false-alarm probabilities of
faint candidate detections, and for extracting information about the albedo
spectrum and other planetary parameters from faint reflected-light signals.Comment: 20 pages, 20 Figures, accepted for publication in MNRA
Exo-C: a probe-scale space observatory for direct imaging and spectroscopy of extrasolar planetary systems
"Exo-C" is NASAs first community study of a modest aperture space telescope mission that is optimized for high contrast observations of exoplanetary systems. The mission will be capable of taking optical spectra of nearby exoplanets in reflected light, discovering previously undetected planets, and imaging structure in a large sample of circumstellar disks. It will obtain unique science results on planets down to super-Earth sizes and serve as a technology pathfinder toward an eventual flagship-class mission to find and characterize habitable Earth-like exoplanets. We present the mission/payload design and highlight steps to reduce mission cost/risk relative to previous mission concepts. Key elements are an unobscured telescope aperture, an internal coronagraph with deformable mirrors for precise wavefront control, and an orbit and observatory design chosen for high thermal stability. Exo-C has a similar telescope aperture, orbit, lifetime, and spacecraft bus requirements to the highly successful Kepler mission (which is our cost reference). Much of the needed technology development is being pursued under the WFIRST coronagraph study and would support a mission start in 2017, should NASA decide to proceed. This paper summarizes the study final report completed in March 2015.United States. National Aeronautics and Space Administration. Astrophysics Divisio
Exo-C: a probe-scale space observatory for direct imaging and spectroscopy of extrasolar planetary systems
"Exo-C" is NASAs first community study of a modest aperture space telescope mission that is optimized for high contrast observations of exoplanetary systems. The mission will be capable of taking optical spectra of nearby exoplanets in reflected light, discovering previously undetected planets, and imaging structure in a large sample of circumstellar disks. It will obtain unique science results on planets down to super-Earth sizes and serve as a technology pathfinder toward an eventual flagship-class mission to find and characterize habitable Earth-like exoplanets. We present the mission/payload design and highlight steps to reduce mission cost/risk relative to previous mission concepts. Key elements are an unobscured telescope aperture, an internal coronagraph with deformable mirrors for precise wavefront control, and an orbit and observatory design chosen for high thermal stability. Exo-C has a similar telescope aperture, orbit, lifetime, and spacecraft bus requirements to the highly successful Kepler mission (which is our cost reference). Much of the needed technology development is being pursued under the WFIRST coronagraph study and would support a mission start in 2017, should NASA decide to proceed. This paper summarizes the study final report completed in March 2015
Nanostructures, Technology, Research, and Applications
Contains reports on the nanostructures laboratory, eighteen research projects and a list of publications.Joint Services Electronics Program Grant DAAH04-95-1-0038Semiconductor Research Corporation Contract 95-LJ-550National Science Foundation Grant ECS 94-07078U.S. Army Research Office Grant DAAH04-95-1-0564Defense Advanced Research Projects Agency/Naval Air Systems Command Contract N00019-95-K-0131National Aeronautics and Space Administration Contract NAS8-38249National Aeronautics and Space Administration Grant NAGW-2003IBM Corporation Contract 1622U.S. Navy- Office of Naval Research Grant N00014-95-1-1297U.S. Army Research Office Grant DAAH04-94-G-0377U.S. Air Force - Office of Scientific Research Grant F-49-620-92-J-0064U.S. Air Force - Office of Scientific Research Grant F-49-620-95-1-031
Exo-C: a probe-scale space observatory for direct imaging and spectroscopy of extrasolar planetary systems
"Exo-C" is NASAs first community study of a modest aperture space telescope mission that is optimized for high contrast observations of exoplanetary systems. The mission will be capable of taking optical spectra of nearby exoplanets in reflected light, discovering previously undetected planets, and imaging structure in a large sample of circumstellar disks. It will obtain unique science results on planets down to super-Earth sizes and serve as a technology pathfinder toward an eventual flagship-class mission to find and characterize habitable Earth-like exoplanets. We present the mission/payload design and highlight steps to reduce mission cost/risk relative to previous mission concepts. Key elements are an unobscured telescope aperture, an internal coronagraph with deformable mirrors for precise wavefront control, and an orbit and observatory design chosen for high thermal stability. Exo-C has a similar telescope aperture, orbit, lifetime, and spacecraft bus requirements to the highly successful Kepler mission (which is our cost reference). Much of the needed technology development is being pursued under the WFIRST coronagraph study and would support a mission start in 2017, should NASA decide to proceed. This paper summarizes the study final report completed in March 2015
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