123 research outputs found
Gravity darkening and tidally perturbed stellar pulsation in the misaligned exoplanet system WASP-33
WASP-33 is one of the few Sct stars with a known planetary
companion. By analyzing the stellar oscillations, we search for possible
star-planet interactions in the pattern of the pulsation. We made use of the
Transit and Light Curve Modeller (TLCM) to solve the light curve from the
Transiting Exoplanet Survey Satellite (TESS). We include gravity darkening into
our analysis. The stellar oscillation pattern of WASP-33 clearly shows signs of
several tidally perturbed modes. We find that there are peaks in the frequency
spectrum that are at or near the rd, th and th orbital harmonics
( d). Also, there is a prominent overabundance of
pulsational frequencies rightwards of the orbital harmonics, being
characteristic of a tidally perturbed stellar pulsation, which is an outcome of
star-planet interactions in the misaligned system. There are peaks in both the
Sct and Dor ranges of the Fourier spectrum, implying that
WASP-33 is a Dor -- Sct hybrid pulsator. The transit light
curves are best fitted by a gravity darkened stellar model, and the planet
parameters are consistent with earlier determinations.Comment: Accepted in A&A on 12 March 2022, 6 pages, 4 figure
Controllability and controller-observer design for a class of linear time-varying systems
âThe final publication is available at Springer via http://dx.doi.org/10.1007/s10852-012-9212-6"In this paper a class of linear time-varying control systems is considered. The time variation consists of a scalar time-varying coefficient multiplying the state matrix of an otherwise time-invariant system. Under very weak assumptions of this coefficient, we show that the controllability can be assessed by an algebraic rank condition, Kalman canonical decomposition is possible, and we give a method for designing a linear state-feedback controller and Luenberger observer
Marked differences in frequencies of statin therapy relevant SLCO1B1 variants and haplotypes between Roma and Hungarian populations
Multivariate searches for single top quark production with the D0 detector
We present a search for electroweak production of single top quarks in the
s-channel (p-pbar -> t bbar + X) and t-channel (p-pbar -> tq bbar + X) modes.
We have analyzed 230 pb^(-1) of data collected with the D0 detector at the
Fermilab Tevatron collider at a center-of-mass energy of sqrt(s) = 1.96 TeV.
Two separate analysis methods are used: neural networks and a cut-based
analysis. No evidence for a single top quark signal is found. We set 95%
confidence level upper limits on the production cross sections using Bayesian
statistics, based on event counts and binned likelihoods formed from the neural
network output. The limits from the neural network (cut-based) analysis are 6.4
pb (10.6 pb) in the s-channel and 5.0 pb (11.3 pb) in the t-channel.Comment: submitted to Phys. Rev. D, Fermilab preprint Fermilab-Pub-06/069-
2017 HRS/EHRA/ECAS/APHRS/SOLAECE expert consensus statement on catheter and surgical ablation of atrial fibrillation: executive summary.
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2017 HRS/EHRA/ECAS/APHRS/SOLAECE expert consensus statement on catheter and surgical ablation of atrial fibrillation: executive summary.
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Measurement of the ttbar production cross section in pbarp collisions at sqrt(s) = 1.96 TeV using secondary vertex b tagging
We report a new measurement of the ttbar production cross section in pbarp
collisions at a center-of-mass energy of 1.96 TeV using events with one charged
lepton (electron or muon), missing transverse energy, and jets. Using 425
pb^{-1} of data collected using the D0 detector at the Fermilab Tevatron
Collider, and enhancing the ttbar content of the sample by tagging b jets with
a secondary vertex tagging algorithm, the ttbar production cross section is
measured to be: 6.6 \pm 0.9 (stat+syst) \pm 0.4 (lum) pb. This cross section is
the most precise D0 measurement to date for ttbar production and is in good
agreement with standard model expectations.Comment: 25 pages, 13 figure
withdrawn 2017 hrs ehra ecas aphrs solaece expert consensus statement on catheter and surgical ablation of atrial fibrillation
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