2,328 research outputs found
Photometric defocus observations of transiting extrasolar planets
We have carried out photometric follow-up observations of bright transiting
extrasolar planets using the CbNUOJ 0.6m telescope. We have tested the
possibility of obtaining high photometric precision by applying the telescope
defocus technique allowing the use of several hundred seconds in exposure time
for a single measurement. We demonstrate that this technique is capable of
obtaining a root-mean-square scatter of order sub-millimagnitude over several
hours for a V 10 host star typical for transiting planets detected from
ground-based survey facilities. We compare our results with transit
observations with the telescope operated in in-focus mode. High photometric
precision is obtained due to the collection of a larger amount of photons
resulting in a higher signal compared to other random and systematic noise
sources. Accurate telescope tracking is likely to further contribute to
lowering systematic noise by probing the same pixels on the CCD. Furthermore, a
longer exposure time helps reducing the effect of scintillation noise which
otherwise has a significant effect for small-aperture telescopes operated in
in-focus mode. Finally we present the results of modelling four light-curves
for which a root-mean-square scatter of 0.70 to 2.3 milli-magnitudes have been
achieved.Comment: 12 pages, 11 figures, 5 tables. Submitted to Journal of Astronomy and
Space Sciences (JASS
Properties of the Planetary Caustic Perturbation
Just two of 10 extrasolar planets found by microlensing have been detected by
the planetary caustic despite the higher probability of planet detection
relative to the central caustic which has been responsible for four extrasolar
planet detections. This is because the perturbations induced by the planetary
caustic are unpredictable, thus making it difficult to carry out strategic
observations. However, if future high-cadence monitoring surveys are conducted,
the majority of planetary caustic events including the events by free-floating
planets and wide-separation planets would be detected. Hence, understanding the
planetary caustic perturbations becomes important. In this paper, we
investigate in detail the pattern of the planetary caustic perturbations. From
this study, we find three properties of the planetary caustic perturbations.
First, planetary systems with the same star-planet separation (s) basically
produce perturbations of constant strength regardless of the planet/star mass
ratio (q), but the duration of each perturbation scales with sqrt{q}. Second,
close planetary systems with the same separation produce essentially the same
negative perturbations between two triangular-shaped caustics regardless of q,
but the duration of the perturbations scales with sqrt{q}. Third, the positive
perturbations for planetary systems with the same mass ratio become stronger as
the caustic shrinks with the increasing |log s|, while the negative
perturbations become weaker. We estimate the degeneracy in the determination of
q that occurs in planetary caustic events. From this, we find that the mass
ratio can be more precisely determined as q increases and |log s| decreases. We
also find that the degeneracy range of events for which the source star passes
close to the planetary caustic is usually very narrow, and thus it would not
significantly affect the determination of q.Comment: 5 pages, 3 figures, 2 tables, accepted in MNRA
Characterization of Phototransduction Gene Knockouts Revealed Important Signaling Networks in the Light-Induced Retinal Degeneration
Understanding the molecular pathways mediating neuronal function in retinas can be greatly
facilitated by the identification of genes regulated in the retinas of different mutants under
various light conditions. We attempted to conduct a gene chip analysis study on the genes
regulated during rhodopsin kinase (Rhok−/−) and arrestin (Sag−/−) knockout and double knockouts in mice retina. Hence, mice were exposed to constant illumination of 450 lux or 6,000 lux on dilated pupils for indicated periods. The retinas were removed after the exposure and processed for microarray analysis. Double knockout was associated with immense changes in gene expression regulating a number of apoptosis inducing transcription factors. Subsequently, network analysis revealed that during early exposure the transcription factors, p53, c-MYC, c-FOS, JUN, and, in late phase, NFκB, appeared to be essential for the initiation of light-induced retinal rod loss, and some other classical pro- and antipoptotic genes appeared to be significantly important as well
Effects of Distilled Cervi Pantotrichum Cornu and Rehmannia glutinosa Pharmacopuncture at GB21 (Jianjing) on Heart Rate Variability: A Randomized and Double-blind Clinical Trial
AbstractBackground/PurposeThe purpose of this study was to use heart rate variability (HRV) to investigate the effects of distilled Cervi Pantotrichum Cornu pharmacopuncture and Rehmannia glutinosa pharmacopuncture on the autonomic nervous system.Materials and methodsForty healthy male participants were divided into two groups: the participants of the C-group received distilled Cervi Pantotrichum Cornu pharmacopuncture and those of the R-group received Rehmannia glutinosa pharmacopuncture. The study design was a randomized, double-blind clinical trial. Each participant received one of the two solutions injected at GB21 (Jianjing). The changes in HRV were measured seven times using the QECG-3: LXC3203 system (LAXTHA Inc. Korea). Time-dependent changes in HRV for each group were analyzed using the paired t test (significance level: p < 0.05), and the difference in the HRV fluctuations between the two experimental groups was evaluated using the independent sample test (significance level: p < 0.05).Results and conclusionThe results showed that Cervi Pantotrichum Cornu pharmacopuncture and Rehmannia glutinosa pharmacopuncture tended to activate the autonomic nervous system within the normal range. Cervi Pantotrichum Cornu pharmacopuncture tended to activate the sympathetic nervous system, whereas Rehmannia glutinosa pharmacopuncture tended to activate both the sympathetic and parasympathetic nervous systems
Far-Ultraviolet Cooling Features of the Antlia Supernova Remnant
We present far-ultraviolet observations of the Antlia supernova remnant
obtained with Far-ultraviolet IMaging Spectrograph (FIMS, also called SPEAR).
The strongest lines observed are C IV 1548,1551 and C III 977. The C IV
emission of this mixed-morphology supernova remnant shows a clumpy
distribution, and the line intensity is nearly constant with radius. The C III
977 line, though too weak to be mapped over the whole remnant, is shown to vary
radially. The line intensity peaks at about half the radius, and drops at the
edge of the remnant. Both the clumpy distribution of C IV and the rise in the C
IV to C III ratio towards the edge suggest that central emission is from
evaporating cloudlets rather than thermal conduction in a more uniform, dense
medium.Comment: 9 pages, 4 figures, will be published in ApJ December 1, 2007, v670n2
issue. see http://astro.snu.ac.kr/~jhshinn/ms.pd
Limits of Binaries That Can Be Characterized by Gravitational Microlensing
Due to the high efficiency of planet detections, current microlensing planet
searches focus on high-magnification events. High-magnification events are
sensitive to remote binary companions as well and thus a sample of
wide-separation binaries are expected to be collected as a byproduct. In this
paper, we show that characterizing binaries for a portion of this sample will
be difficult due to the degeneracy of the binary-lensing parameters. This
degeneracy arises because the perturbation induced by the binary companion is
well approximated by the Chang-Refsdal lensing for binaries with separations
greater than a certain limit. For binaries composed of equal mass lenses, we
find that the lens binarity can be noticed up to the separations of
times of the Einstein radius corresponding to the mass of each lens. Among
these binaries, however, we find that the lensing parameters can be determined
only for a portion of binaries with separations less than times of
the Einstein radius.Comment: 5 pages, 3 figures, 1 tabl
Distinguishing central perturbations by binary stellar and planetary systems under the moderately strong finite-source effect
We investigate high-magnification events caused by wide binary stellar and
planetary systems under the moderately strong finite-source effect where the
diameter of the source star is comparable with the caustics induced by a binary
companion and a planet. From this investigation, we find that a characteristic
feature in the central perturbations induced by the binary systems commonly
appears in a constant range where the size of the caustic induced by the binary
companion is between 1.5 and 1.9 times of the diameter of the source, whereas
in the central perturbations induced by the planetary systems the feature
commonly appears in a range where the ratio of the size of the caustic induced
by the planet to the source diameter changes with the planet/primary mass
ratio. High-magnification events caused by the binary and planetary systems
with the characteristic feature produce a distinctive short-duration bump in
the residuals from the single-lensing light curve, where the bump occurs near
the time of peak magnification of the events. Because of a well-known
planet/binary degeneracy, we compare binary- and planetary-lensing events with
the short-duration bump in the residuals. As a result, we find the features of
the binary-lensing events that are discriminated from the planetary-lensing
events despite the moderately strong finite-source effect and thus can be used
to immediately distinguish between the binary and planetary companions. We also
find the feature that appears only in binary-lensing events with a very low
mass ratio or planetary-lensing events. This implies that the lens systems with
the feature have a very low mass binary companion (such as a brown dwarf) or a
planet.Comment: 18 pages, 7 figures, accepted by Ap
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