Planet Hunters TESS. V. A Planetary System Around a Binary Star, Including a Mini-Neptune in the Habitable Zone

We report on the discovery and validation of a transiting long-period mini-Neptune orbiting a bright (V = 9.0 mag) G dwarf (TOI 4633; R = 1.05 R ⊙, M = 1.10 M ⊙). The planet was identified in data from the Transiting Exoplanet Survey Satellite by citizen scientists taking part in the Planet Hunters TESS project. Modelling of the transit events yields an orbital period of 271.9445 ± 0.0040 days and radius of 3.2 ± 0.20 R ⊕. The Earth-like orbital period and an incident flux of 1.56−0.16+0.20 F ⊕ places it in the optimistic habitable zone around the star. Doppler spectroscopy of the system allowed us to place an upper mass limit on the transiting planet and revealed a non-transiting planet candidate in the system with a period of 34.15 ± 0.15 days. Furthermore, the combination of archival data dating back to 1905 with new high angular resolution imaging revealed a stellar companion orbiting the primary star with an orbital period of around 230 yr and an eccentricity of about 0.9. The long period of the transiting planet, combined with the high eccentricity and close approach of the companion star makes this a valuable system for testing the formation and stability of planets in binary systems

Last passage time for the empirical mean of some mixing processes

This paper studies the last time when an estimator, which is based on some strongly mixing data, is far from its almost sure limiting value. Applications are given for AR processes and MCMC methods.Mixing process Number of [epsilon]-misses The last n AR processes Gibbs sampling

Non linear properties of dense PIN-PT ceramics

International audienceNonlinear measurements of dense 63PbIn1/2Nb1/2- 37PbTiO3 (PIN-37PT) piezoceramics, was recorded at 1 kHz and at resonance under driven AC electric fields and axial static pressure. Influence of donor or softener (Mg, Nb) and acceptor or hardener (Mn) was investigated. Dependence of the real and imaginary parts of the dielectric constant on electric field was compared with PZT hard ceramics and PMN-PT soft ceramics. The mechanical nonlinear behavior of piezoelectric ceramics, characterized by two coefficients (α and β), was measured according to the CENELEC European Standards EN5034-3. The new mechanical nonlinear coefficient β measures the compliance variation. The α and β coefficients of PIN-37PT ceramics, 0.95×106 and 3.8×106, are larger than that hard PZT8 (0.03×106 and 0.3×10 5). © 2009 Materials Research Society

A New Triply Rotated Quartz Cut for the fabrication of Low Loss IF SAW Filters

International audienc

Grain size effect on electromechanical properties and non-linear response of dense nano and microstructured PIN-PT ceramics

International audienceNanopowders of 0.63Pb(In1/2Nb1/2)O-3-0.37PbTiO(3) were synthesized by solid state reaction using the continuous attrition milling followed by high-energy ball milling techniques in air at room temperature. After milling for 8 h nanopowders of 20-30 nm grain size are obtained. Sintering by hot pressing of PIN-37PT green pellets leads to dense ceramics with average grain size varying from 100 nm to 1 mu m. The dielectric and piezoelectric properties of PIN-37PT nanostructured ceramics with grain size bigger than about 160 nm remain roughly unchanged and comparable to those of microstructured ceramics. In addition, the stability of the permittivity and dielectric losses under high ac electric field grows when the grain size decreases. The material becomes less non-linear with decreasing grain size. This result is attractive for acoustic transducer applications

1981 face and horn fly : control studies on beef cattle in Missouri

"MP 538, 4/82/500

1980 face and horn fly : control studies on beef cattle in Missouri

"MP 528, 4/81/750