Refined architecture of the WASP-8 system: a cautionary tale for traditional Rossiter-McLaughlin analysis

Probing the trajectory of a transiting planet across the disk of its star through the analysis of its Rossiter-McLaughlin effect can be used to measure the differential rotation of the host star and the true obliquity of the system. Highly misaligned systems could be particularly conducive to these mesurements, which is why we reanalysed the HARPS transit spectra of WASP-8b using the 'Rossiter-McLaughlin effect reloaded' (reloaded RM) technique. This approach allows us to isolate the local stellar CCF emitted by the planet-occulted regions. As a result we identified a $\sim$35% variation in the local CCF contrast along the transit chord, which might trace a deepening of the stellar lines from the equator to the poles. Whatever its origin, such an effect cannot be detected when analyzing the RV centroids of the disk-integrated CCFs through a traditional velocimetric analysis of the RM effect. Consequently it injected a significant bias into the results obtained by Queloz et al. (2010) for the projected rotational velocity $v_{eq} \sin i_{\star}$ (1.59$\stackrel{+0.08}{_{-0.09}}$ km/s) and the sky-projected obliquity $\lambda$ (-123.0$\stackrel{+3.4}{_{-4.4}}^{\circ}$). Using our technique, we measured these values to be $v_{eq} \sin i_{\star}$ = 1.90$\pm$0.05 km/s and $\lambda$ = -143.0$\stackrel{+1.6}{_{-1.5}}^{\circ}$. We found no compelling evidence for differential rotation of the star, although there are hints that WASP-8 is pointing away from us with the stellar poles rotating about 25% slower than the equator. Measurements at higher accuracy during ingress/egress will be required to confirm this result. In contrast to the traditional analysis of the RM effect, the reloaded RM technique directly extracts the local stellar CCFs, allowing us to analyze their shape and to measure their RV centroids, unbiased by variations in their contrast or FWHM.Comment: Accepted for publication in A&A. 12 page

Conformations of biopolymers in the gas phase: a new mass spectrometric method

A method is developed for measuring collision cross sections of gas-phase biomolecules using a slightly modified commercial triple quadrupole instrument. The modifications allow accurate stopping potentials to be measured for ions exiting the collision region of the instrument. A simple model allows these curves to be converted to cross sections. In order to account for certain poorly defined experimental parameters (exact ion energy, absolute pressure in the collision cell, etc.) variable parameters are included in the model. These parameters are determined on a case by case basis by normalizing the results to the well known cross section of singly charged bradykinin, Two relatively large systems were studied (cytochrome c and myoglobin) so comparisons could be made to literature values. A number of new peptide systems were then studied in the 9 -14 residue range. These included singly and doubly charged ions of luteinizing hormone releasing hormone (LHRH) substance P, and bombesin in addition to bradykinin. The experimental cross sections were in very good agreement with predictions from extensive molecular dynamics modeling. One interesting result was the experimental observation that the cross section of the doubly charged ions of LHRH, substance P, and bombesin were all smaller than those of the corresponding singly charged ions. Molecular dynamics did not reproduce this result, predicting doubly charged cross sections of the same magnitude or slightly larger than for the singly charged species. The experimental results appear to be correct, however. Possible shortcomings in the modeling procedure for multiply charged ions were suggested that might account for the discrepancy

Hispanic Teachers and Leaders in Catholic Schools: Special Issue Introduction

Introduction to the Special Issue (no abstract needed

Cultivating Talent: Insights from the 2022 National Study Examining Pathways to Increase the Presence of Hispanic Teachers and Leaders in Catholic Schools

This article draws extensively on data from Cultivating Talent: A National Study Examining Pathways to Increase the Presence of Hispanic Teachers and Leaders in Catholic Schools, conducted by Boston College researchers and released in January 2022. The report looks to understand and appreciate the various ways in which Hispanics educators are transforming the American Catholic school experience. Our findings clearly show that Catholic schools in the United States are and will be further enriched by the presence and contributions of Hispanic teachers and leaders. The report encourages stakeholders of Catholic education and pastoral leaders at all levels, across the nation, to make a renewed commitment to investing and cultivating talent within the Hispanic community

A Non-isothermal Theory for Interpreting Sodium Lines in Transmission Spectra of Exoplanets

We present a theory for interpreting the sodium lines detected in transmission spectra of exoplanetary atmospheres. Previous analyses employed the isothermal approximation and dealt only with the transit radius. By recognising the absorption depth and the transit radius as being independent observables, we develop a theory for jointly interpreting both quantities, which allows us to infer the temperatures and number densities associated with the sodium lines. We are able to treat a non-isothermal situation with a constant temperature gradient. Our novel diagnostics take the form of simple-to-use algebraic formulae and require measurements of the transit radii (and their corresponding absorption depths) at line center and in the line wing for both sodium lines. We apply our diagnostics to the HARPS data of HD 189733b, confirm the upper atmospheric heating reported by Huitson et al. (2012), derive a temperature gradient of $0.4376 \pm 0.0154$ K km$^{-1}$ and find densities $\sim 1$ to $10^4$ cm$^{-3}$.Comment: Accepted by ApJ Letters. 6 pages, 3 figure

Alpine grassland vegetation at Gornergrat (Canton of Valais, Switzerland) : vegetation mapping for environ-mental planning

Alpine landscapes are increasingly used by tourism. At the highly frequented Gornergrat in Switzerland there was a need to develop a concept to demerge the paths of hikers and mountain bikers and thus enable a conflict-free use for all user groups. The present study aimed at providing vegetation maps of the sensible areas at Gornergrat to derive recommendations for the planning and restoration of the new trail network. For this purpose, we sampled 32 vegetation plots (10 m²). These were then subjected to TWINSPAN classification, and the derived five units characterized by their diagnostic species based on standardized phi-values. We used ANOVA to test for differences of these units with regard to environmental parameters. The five distinguished vegetation units were assigned to syntaxa down to the alliance level. Finally, a mapping key was derived from the synoptic table to allow the delimitation of units in the field, which resulted in two vegetation maps. We found protected habitats and vascular plant species, as well as a species of the Red List of vascular plants in the study area. Especially at the Riffel Lake, the area has striking disturbances of vegetation due to trampling, which has increased significantly in the last 30 years. For the Gornergrat concept we thus recommend (i) to make the disturbed vegetation at the eastern lake shore inaccessible to visitors, (ii) to restore this part with low-intensity measures and (iii) not to lead the planned new changes through sensitive areas (snow beds and fens)

El Proyecto Cartovirtual: Cartoteca Nacional Histórica Virtual

El Proyecto CartoVIRTUAL propone el desarrollo de soluciones para el acceso vía Internet a los fondos distribuidos de las cartotecas hispano-lusas, con el objetivo de promocionar la publicación del patrimonio cartográfico y facilitar el trabajo de investigadores y documentalistas. Para ello, se utilizan los estándares y servicios de las Infraestructuras de Datos Espaciales (IDE) y se desea diseminar los contenidos académicos a través de plataformas educativas. Se pretende implementar un prototipo de Cartoteca Histórica Virtual distribuida con las ventajas de las cartotecas reales, que disponga de servicios interoperables, gratuitos y de código abierto para la búsqueda y el acceso al contenido histórico. Más allá del acceso a los recursos y de la simple visualización de los documentos, se están desarrollando nuevas herramientas online para su estudio, favoreciendo la preservación de los fondos y limitando su acceso físico. En este artículo se presentan los avances tecnológicos desarrollados hasta la fecha y los nuevos retos que quedan por resolver