Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Schmidt, Tobias M"'
Autor:
Milaković, Dinko, Webb, John K., Molaro, Paolo, Lee, Chung-Chi, Jethwa, Prashin, Cupani, Guido, Murphy, Michael T., Welsh, Louise, D'Odorico, Valentina, Cristiani, Stefano, Santos, Ricardo Génova, Martins, Carlos J. A. P., Nunes, Nelson J., Schmidt, Tobias M., Pepe, Francesco A., Osorio, Maria Rosa Zapatero, Alibert, Yann, Hernández, J. I. González, Di Marcantonio, Paolo, Palle, Enric, Santos, Nuno C., Rebolo, Rafael
Chemical evolution models predict a gradual build-up of $^{13}$C in the universe, based on empirical nuclear reaction rates and assumptions on the properties of stellar populations. However, old metal-poor stars within the Galaxy contain more $^{13}$
Externí odkaz:
http://arxiv.org/abs/2407.17953
Autor:
Chazelas, Bruno, Ivanisenko, Yevgeniy, Lanotte, Audrey, Diaz, Pablo Santos, Genolet, Ludovic, Sordet, Michael, Hughes, Ian, Lovis, Christophe, Schmidt, Tobias M., Amate, Manuel, Castro, José Peñate, Moreno, Afrodisio Vega, Tenegi, Fabio, Simoes, Roberto, Hernández, Jonay I. González, Osorio, María Rosa Zapatero, Piqueras, Javier, Dávila, Tomás Belenguer, Ortega, Rocío Calvo, González, Roberto Varas, Fernández, Luis Miguel González, Amado, Pedro J., Kern, Jonathan, Dionies, Frank, Bauer, Svend-Marian, Önel, Hakan, Järvinen, Arto, Brynnel, Joar, Füßlein, Christine, Bellido, Olga, Weingrill, Jörg, Giannone, Domenico, Gaessler, Wolfgang, lehmitz, Michael, Kaminski, Adrian, Stilz, Ingo, Sigwarth, Michael, Marconi, Alessandro, Di Marcantonio, Paolo, Oliva, Ernesto, Coretti, Igor, Aliverti, Matteo, Pariani, Giorgio, Cabona, Lorenzo, Radaelli, Edouardo Maria Alberto, Scalera, Marcello, Balestera, Andrea
We present here the preliminary design of the RIZ module, one of the visible spectrographs of the ANDES instrument 1. It is a fiber-fed high-resolution, high-stability spectrograph. Its design follows the guidelines of successful predecessors such as
Externí odkaz:
http://arxiv.org/abs/2406.18317
Autor:
Schmidt, Tobias M.
Ground-based astronomy is unavoidably subject to the adverse effect of atmospheric turbulence, a.k.a. the seeing, which blurs the images and limits the achievable spatial resolution. For spectroscopic observations, it leads to slit or fiber-injection
Externí odkaz:
http://arxiv.org/abs/2406.07193
Autor:
Schmidt, Tobias M., Bouchy, François
Achieving a truly accurate wavelength calibration of high-dispersion echelle spectrographs is a challenging task but crucially needed for certain science cases, e.g. to test for a possible variation of the fine-structure constant in quasar spectra. O
Externí odkaz:
http://arxiv.org/abs/2404.05283
Autor:
Guarneri, Francesco, Pasquini, Luca, D'Odorico, Valentina, Cristiani, Stefano, Cupani, Guido, Di Marcantonio, Paolo, Hernández, J. I. González, Martins, C. J. A. P., Mascareño, Alejandro Suárez, Milaković, Dinko, Molaro, Paolo, Murphy, Michael T., Nunes, Nelson J., Palle, Enric, Pepe, Francesco, Rebolo, Rafael, Santos, Nuno C., Santos, Ricardo Génova, Schmidt, Tobias M., Sousa, Sérgio G., Sozzetti, Alessandro, Trost, Andrea
Primordial abundances of light elements are sensitive to the physics of the early Universe and can directly constrain cosmological quantities, such as the baryon-to-photon ratio $\eta_{10}$, the baryon density and the number of neutrino families. Deu
Externí odkaz:
http://arxiv.org/abs/2402.05586
Autor:
Cristiani, Stefano, Cupani, Guido, Trost, Andrea, D'Odorico, Valentina, Guarneri, Francesco, Curto, Gaspare Lo, Meneghetti, Massimo, Di Marcantonio, Paolo, Faria, João P., Hernández, Jonay I. González, Lovis, Christophe, Martins, Carlos J. A. P., Milaković, Dinko, Molaro, Paolo, Murphy, Michael T., Nunes, Nelson J., Pepe, Francesco, Rebolo, Rafael, Santos, Nuno C., Schmidt, Tobias M., Sousa, Sérgio G., Sozzetti, Alessandro, Osorio, María Rosa Zapatero
The gravitationally lensed quasar J014516.6-094517 at z=2.719 has been observed with the ESPRESSO instrument at the ESO VLT to obtain high-fidelity spectra of the two images A and B with a resolving power R=70000. At the redshifts under investigation
Externí odkaz:
http://arxiv.org/abs/2402.05896
Autor:
Ludwig, Markus, Ayhan, Furkan, Schmidt, Tobias M., Wildi, Thibault, Voumard, Thibault, Blum, Roman, Ye, Zhichao, Lei, Fuchuan, Wildi, François, Pepe, Francesco, Gaafar, Mahmoud A., Obrzud, Ewelina, Grassani, Davide, Hefti, Olivia, Karlen, Sylvain, Lecomte, Steve, Moreau, François, Chazelas, Bruno, Sottile, Rico, Torres-Company, Victor, Brasch, Victor, Villanueva, Luis G., Bouchy, François, Herr, Tobias
Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical constants across cosmological scales. Laser frequency combs can provide
Externí odkaz:
http://arxiv.org/abs/2306.13609
Autor:
Martins, C. J. A. P., Cristiani, S., Cupani, G., D'Odorico, V., Santos, R. Génova, Leite, A. C. O., Marques, C. M. J., Milaković, D., Molaro, P., Murphy, Michael T., Nunes, N. J., Schmidt, Tobias M., Adibekyan, V., Alibert, Y., Di Marcantonio, Paolo, Hernández, J. I. González, Mégevand, D., Palle, E., Pepe, F. A., Santos, N. C., Sousa, S. G., Sozzetti, A., Mascareño, A. Suárez, Osorio, M. R. Zapatero
Dynamical scalar fields in an effective four-dimensional field theory are naturally expected to couple to the rest of the theory's degrees of freedom, unless some new symmetry is postulated to suppress these couplings. In particular, a coupling to th
Externí odkaz:
http://arxiv.org/abs/2205.13848
Autor:
Schmidt, Tobias M., Chazelas, Bruno, Lovis, Christophe, Dumusque, Xavier, Bouchy, François, Pepe, Francesco, Figueira, Pedro, Sosnowska, Danuta
Publikováno v:
A&A 664, A191 (2022)
In the last decade, white-light illuminated Fabry-P\'erot interferometers wave been established as a widely used, relatively simple, reliable, and cost-effective way to precisely calibrate high-resolution echelle spectrographs. However, Terrien et al
Externí odkaz:
http://arxiv.org/abs/2204.05713
Autor:
da Fonseca, Vitor, Barreiro, Tiago, Nunes, Nelson J., Cristiani, Stefano, Cupani, Guido, D'Odorico, Valentina, Santos, Ricardo Génova, Leite, Ana C. O., Marques, Catarina M. J., Martins, Carlos J. A. P., Milaković, Dinko, Molaro, Paolo, Murphy, Michael T., Schmidt, Tobias M., Abreu, Manuel, Adibekyan, Vardan, Cabral, Alexandre, Di Marcantonio, Paolo, Hernández, Jonay I. González, Palle, Enric, Pepe, Francesco A., Rebolo, Rafael, Santos, Nuno C., Sousa, Sérgio G., Sozzetti, Alessandro, Mascareño, Alejandro Suárez, Osorio, Maria-Rosa Zapatero
Publikováno v:
A&A 666, A57 (2022)
The spectrograph ESPRESSO recently obtained a limit on the variation of the fine-structure constant, $\alpha$, through measurements along the line of sight of a bright quasar with a precision of $1.36$ ppm at $1\sigma$ level. This imposes new constra
Externí odkaz:
http://arxiv.org/abs/2204.02930