1,943 research outputs found
K-band transit and secondary eclipse photometry of exoplanet OGLE-TR-113b
We present high precision K-band photometry of the transit and secondary
eclipse of extrasolar planet OGLE-TR-113, using the SOFI near-infrared
instrument on ESO's NTT. Data were taken in 5 second exposures over two periods
of 3-4 hours, using random jitter position offsets. In this way, a relative
photometric precision of ~1% per frame was achieved, avoiding systematic
effects that seem to become dominant at precisions exceeding this level, and
resulting in an overall accuracy of 0.1% per ~10 minutes. The observations of
the transit show a flat bottom light-curve indicative of a significantly lower
stellar limb-darkening at near-infrared than at optical wavelengths. The
observations of the secondary eclipse result in a 3 sigma detection of emission
from the exoplanet at 0.17+-0.05%. However, residual systematic errors make
this detection rather tentative.Comment: 6 pages, 7 figures: MNRAS accepte
Polarization in the prompt emission of gamma-ray bursts and their afterglows
Synchrotron is considered the dominant emission mechanism in the production
of gamma-ray burst photons in the prompt as well as in the afterglow phase.
Polarization is a characteristic feature of synchrotron and its study can
reveal a wealth of information on the properties of the magnetic field and of
the energy distribution in gamma-ray burst jets. In this paper I will review
the theory and observations of gamma-ray bursts polarization. While the theory
is well established, observations have prove difficult to perform, due to the
weakness of the signal. The discriminating power of polarization observations,
however, cannot be overestimated.Comment: 16 pages, 9 figures, accepted for publication in the New Journal of
Physics focus issue on Gamma Ray Burst
On the detection of very high redshift Gamma Ray Bursts with Swift
We compute the probability to detect long Gamma Ray Bursts (GRBs) at z>5 with
Swift, assuming that GRBs form preferentially in low-metallicity environments.
The model fits well both the observed BATSE and Swift GRB differential peak
flux distribution and is consistent with the number of z>2.5 detections in the
2-year Swift data. We find that the probability to observe a burst at z>5
becomes larger than 10% for photon fluxes P<1 ph s^{-1} cm^{-2}, consistent
with the number of confirmed detections. The corresponding fraction of z>5
bursts in the Swift catalog is ~10%-30% depending on the adopted metallicity
threshold for GRB formation. We propose to use the computed probability as a
tool to identify high redshift GRBs. By jointly considering promptly-available
information provided by Swift and model results, we can select reliable z>5
candidates in a few hours from the BAT detection. We test the procedure against
last year Swift data: only three bursts match all our requirements, two being
confirmed at z>5. Other three possible candidates are picked up by slightly
relaxing the adopted criteria. No low-z interloper is found among the six
candidates.Comment: 5 pages, 2 figures, MNRAS in pres
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