Three long period transiting giant planets from TESS

We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single transit events in the light curves generated from the full frame images of the Transiting Exoplanet Survey Satellite (TESS). Follow-up radial velocity measurements and additional light curves were used to determine the orbital periods and confirm the planetary nature of the candidates. The planets orbit slightly metal-rich late F- and early G-type stars. We find that TOI 4406b has a mass of $M_P$= 0.30 $\pm$ 0.04 $M_J$ , a radius of $R_P$= 1.00 $\pm$ 0.02 $R_J$ , and a low eccentricity orbit (e=0.15 $\pm$ 0.05) with a period of P= 30.08364 $\pm$ 0.00005 d . TOI 2338b has a mass of $M_P$= 5.98 $\pm$ 0.20 $M_J$ , a radius of $R_P$= 1.00 $\pm$ 0.01 $R_J$ , and a highly eccentric orbit (e= 0.676 $\pm$ 0.002 ) with a period of P= 22.65398 $\pm$ 0.00002 d . Finally, TOI 2589b has a mass of $M_P$= 3.50 $\pm$ 0.10 $M_J$ , a radius of $R_P$= 1.08 $\pm$ 0.03 $R_J$ , and an eccentric orbit (e = 0.522 $\pm$ 0.006 ) with a period of P= 61.6277 $\pm$ 0.0002 d . TOI 4406b and TOI 2338b are enriched in metals compared to their host stars, while the structure of TOI 2589b is consistent with having similar metal enrichment to its host star.Comment: 24 pages, 16 figures, accepted in A

Electric field controlled magnetic hysteresis loops in a metglas (r)/pmn-pt heterostructure

Abstract An electric field tunable magnetic hysteresis loop was studied in a multiferroic heterostructure consisting of a 25 µm thick Metglas ® ribbon affixed to a lead magnesium niobate-lead titanate (PMN-PT) crystal. This multiferroic heterostructure exhibits a considerably strong converse magnetoelectric effect, CME = −80%, where CME , and a converse magnetoelectric coupling constant, A = 23 Oe cm kV −1 , in the vicinity of the saturation electric polarization. This work systematically demonstrates the tunability of magnetic parameters including magnetization, coercivity, remanence and squareness, under the application of an electric field of 0-8 kV cm −1 . Additionally, the physical mechanism of the CME is discussed. These results provide useful resources for the design of a new generation of electrically controlled devices

Explaining cooperative enterprises through knowledge acquisition outcomes

This paper develops a model of a cooperative enterprise and compares it to a vertically separated market. In our model of a multi-stage production process, agents can acquire costly knowledge to decrease production costs. Our model shows that the cooperative acquires less non-generalizable knowledge than the market, but more generalizable knowledge if the large member in the cooperative receives a sufficiently large share of the cooperative's profits. Additionally, we derive that the cooperative generates larger aggregate surplus than the market if the influence of generalizable knowledge on production costs is large