1,972 research outputs found
Diagnosing aerosols in extrasolar giant planets with cross-correlation function of water bands
No full textTransmission spectroscopy with ground-based, high-resolution instruments provides key insight into the composition of exoplanetary atmospheres. Molecules such as water and carbon monoxide have been unambiguously identified in hot gas giants through cross-correlation techniques. A maximum in the cross-correlation function (CCF) is found when the molecular absorption lines in a binary mask or model template match those contained in the planet. Here, we demonstrate how the CCF method can be used to diagnose broadband spectroscopic features such as scattering by aerosols in high-resolution transit spectra. The idea consists in exploiting the presence of multiple water bands from the optical to the near-infrared. We have produced a set of models of a typical hot Jupiter spanning various conditions of temperature and aerosol coverage. We demonstrate that comparing the CCFs of individual water bands for the models constrains the presence and the properties of the aerosol layers. The contrast difference between the CCFs of two bands can reach ~100 ppm, which could be readily detectable with current or upcoming high-resolution stabilized spectrographs spanning a wide spectral range, such as ESPRESSO, CARMENES, HARPS-N+GIANO, HARPS+NIRPS, SPIRou, or CRIRES+
Tradução de uma disputa : Christophe versus Pétion em La tragédie du roi Christophe, de Aimé Césaire
No full textEsta contribuição propõe a tradução comentada da primeira cena da peça de teatro La Tragédie du roi Christophe (A tragédia do rei Christophe), de Aimé Césaire. O texto foi publicado pelo autor martinicano em 1963 e encenado a partir de 1964. A história aborda o embate histórico entre os dois líderes revolucionários haitianos, Alexandre Pétion (1770-1818) e Henry Christophe (1767-1820), após o estabelecimento da independência do Haiti, em 1804. O ex-escravizado Henry Christophe I, autoproclamado rei do Haiti em 1811, protagoniza, na peça, os impasses políticos decorrentes do processo de descolonização para a constituição de um novo estado haitiano livre e democrático. Optamos por traduzir a cena que anuncia e ilustra, na abertura do primeiro Ato, o caráter trágico que permeia o desenrolar dos eventos.This contribution proposes the commented translation of the first scene of the play La Tragédie du roi Christophe (The tragedy of King Christophe), by Aimé Césaire. The text was published by the Martinican author in 1963 and staged from 1964 onwards. The story addresses the historical clash between the two Haitian revolutionary leaders, Alexandre Pétion (1770-1818) and Henry Christophe (1767-1820), after the establishment of Haitian independence in 1804. The ex-enslaved Henry Christophe I, self-proclaimed King of Haiti in 1811, stars, in the play, political impasses resulting from the decolonization process, for the constitution of a new free and democratic Haitian state. We chose to translate the scene that announces and illustrates, in the opening of the first Act, the tragic character that permeates the unfolding of events
Formation and structure of the three Neptune-mass planets system around HD 69830
No full textAccepted in AA LettersSince the discovery of the first giant planet outside the solar system in 1995 (Mayor & Queloz 1995), more than 180 extrasolar planets have been discovered. With improving detection capabilities, a new class of planets with masses 5-20 times larger than the Earth, at close distance from their parent star is rapidly emerging. Recently, the first system of three Neptune-mass planets has been discovered around the solar type star HD69830 (Lovis et al. 2006). Here, we present and discuss a possible formation scenario for this planetary system based on a consistent coupling between the extended core accretion model and evolutionary models (Alibert et al. 2005a, Baraffe et al. 2004,2006). We show that the innermost planet formed from an embryo having started inside the iceline is composed essentially of a rocky core surrounded by a tiny gaseous envelope. The two outermost planets started their formation beyond the iceline and, as a consequence, accrete a substantial amount of water ice during their formation. We calculate the present day thermodynamical conditions inside these two latter planets and show that they are made of a rocky core surrounded by a shell of fluid water and a gaseous envelope
Morisset/PyNeb_devel: 1.1.9
No full textcommit ab6cdb8a4af2ff75b82fc1422004934945c82530
Author: morisset [email protected]
Date: Sat Jul 6 11:25:45 2019 -0700
1.1.9
V 1.1.9
commit f7e6a418d2affb8db163c8c6c2428173b5f4aacf
Author: morisset [email protected]
Date: Fri Jun 7 07:15:42 2019 -0700
Create _chianti_tools_9.py
commit 81213b885e2b359a62e3d6e73515e39dc7056561
Author: Christophe Morisset [email protected]
Date: Wed Jun 5 16:19:33 2019 -0700
Adding Chianti 9
commit 5a9a7dfc9a4d922a216ac11f39b76c2d63097d3b
Author: Christophe Morisset [email protected]
Date: Wed Jun 5 16:19:05 2019 -0700
1.1.9b4
commit 152f9192847cd7f3194e0a778caca66f966392c1
Author: morisset [email protected]
Date: Wed May 22 14:13:30 2019 -0700
T_min ans max were not used
commit 22aeec4db4efc7bcc377b54a92292e157335825d
Author: morisset [email protected]
Date: Sun May 19 10:18:52 2019 -0700
1.1.9b3
commit 4dc721eecdd2511fcde69f835fc6181f7be1b74d
Author: morisset [email protected]
Date: Sun May 19 10:18:34 2019 -0700
manage wl<Lyalpha master
commit 44192233b57ef46cc479e6bfc2a9020cbfc3d5f6
Author: morisset [email protected]
Date: Fri May 17 13:07:55 2019 -0700
1.1.9b2
commit 95e07d78fb38cc6267f38e11d3051738814a4dfd
Author: morisset [email protected]
Date: Fri May 17 13:07:47 2019 -0700
light wl array
commit 9a159290e931fbdbbff8b13968d7540f8b0cef18
Author: morisset [email protected]
Date: Fri May 17 13:07:27 2019 -0700
add continuum to init
commit da0e0b6ac19bc6808bc7366217ad4a0885e1ca0e
Author: morisset [email protected]
Date: Thu Mar 21 11:48:08 2019 -0300
1.1.9b1
before branch to Regresor developemen
Christophe Colomb, le caoutchouc et les tétines
No full textChristoph Kolumbus, Kautschuk und die Gummisauger.
Der Verfasser schildert kurz die Geschichte des Kautschuks und erwänt die apotheker welche daran beteiligt sind. Er legt anschliessend die Geschichte der Gummisauger und der Milchflaschen dar, deren eine der meistgängisten die « Robert'sche Milchflasche » gewesen ist.Christopher Columbus, rubber, and rubber nipples.
The author quickly traces the history of rubber, making note of the pharmacists who therein played a role. He exhibits the history of rubber nipples and that of infant bottles, of which one of the most widely used was the « Robert Bottle. »Labeÿ Robert. Christophe Colomb, le caoutchouc et les tétines. In: Revue d'histoire de la pharmacie, 82ᵉ année, n°300, 1994. pp. 55-63
A non-isothermal theory for interpreting sodium lines in transmission spectra of exoplanets
No full textCopyright © 2015. The American Astronomical Society. All rights reserved.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 recognizing 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., derive a temperature gradient of 0.4376±0.0154Kkm−1, and find densities ∼1–104 cm−3.Swiss National Science FoundationEuropean Research Counci
Exoplanet Atmospheric Studies At High Spectral Resolution
No full textThe study of exoplanet atmospheres is essential to understand the formation, evolution and composition of exoplanets. When a planet pass between its host star and an observer, a fraction of the star-light is absorbed by its atmosphere, thus revealing its composition. This thesis focuses on the use of high-resolution spectrographs to extract unambiguously atmospheric signals and learn more about the dynamic and composition of exoplanet atmospheres. Two atmospheric tracers have particularly been studied, the helium triplet and the visible water vapor bands. They provide complementary information on the atmospheric structure. This thesis also explores how instrumental systematics and the Earth contamination impact high-resolution spectra and how it is possible to remove them. Finally, this work describes the construction of atmospheric surveys for state-of-the-art high-resolution spectrographs, such as ESPRESSO and NIRPS. These surveys will provide a robust and statistical view of exoplanet atmospheres
Mixed and Augmented Reality Tools in the Medical Anatomy Curriculum
No full textISSN:0926-9630ISSN:1879-8365ISSN:1879-836
Amélioration de l'étalonnage en longueur d'onde de spectrovélocimètres à grande fidélité
No full textUne des techniques les plus prolifiques à ce jour pour la recherche d'exoplanètes est la technique des vitesses radiales. Durant cette thèse, je me suis essentiellement attaché à améliorer la solution en longueur d'onde des spectrographes HARPS et HARPS-N, notamment en corrigeant l'effet engendré par la variation de taille des pixels des capteurs CCD sur les vitesses radiales. Nous avons reréduit toutes les données brutes de HARPS et HARPS-N et avons pu constater des améliorations significatives par rapport à la réduction utilisée jusqu'alors. L'analyse de plusieurs systèmes spécifiques a permis de trouver plusieurs candidats planétaires et d'autres nouveaux signaux ainsi que de calculer les limites de détection pour ces étoiles. Les améliorations mentionnées précédemment ont ensuite été intégrées à la solution en longueur d'onde combinée utilisant à la fois les lampes thorium-argon et un interféromètre de Fabry-Perot, ce qui a permis d'obtenir des résultats encore meilleurs
- …
