Zobrazeno 1 - 10
of 4 615
pro vyhledávání: '"A. Lovis"'
Autor:
Cretignier, M., Hara, N. C., Pietrow, A. G. M., Zhao, Y., Yu, H., Dumusque, X., Sozzetti, A., Lovis, C., Aigrain, S.
In our former paper I, we showed on the Sun that different active regions possess unique intensity profiles on the Ca II H & K lines. We now extend the analysis by showing how those properties can be used on real stellar observations, delivering more
Externí odkaz:
http://arxiv.org/abs/2411.00557
Autor:
Restori, N., Blind, N., Kühn, J., Chazelas, B., Lovis, C., Mordasini, C., Shinde, M., Martinez, P., Guyon, O.
The objective of the coronagraphic IFU of RISTRETTO is to enable High Dispersion Coronagraphy of planets at a distance of 2$\lambda$/D from their star, without compromising on transmission. The new idea of a PIAA Nuller (PIAAN) allows contrast down t
Externí odkaz:
http://arxiv.org/abs/2411.00486
Autor:
Armah, Lovis Kwasi, Melnykov, Igor
Effectively applying the K-means algorithm to data with missing values remains an important research area due to its impact on applications that rely on K-means clustering. Recent studies have shown that integrating imputation directly into the K-mea
Externí odkaz:
http://arxiv.org/abs/2411.00870
Autor:
Hernandez, J. I. Gonzalez, Mascareno, A. Suarez, Silva, A. M., Stefanov, A. K., Faria, J. P., Tabernero, H. M., Sozzetti, A., Rebolo, R., Pepe, F., Santos, N. C., Cristiani, S., Lovis, C., Dumusque, X., Figueira, P., Lillo-Box, J., Nari, N., Benatti, S., Hobson, M. J., Castro-Gonz'alez, A., Allart, R., Passegger, V. M., Osorio, M. -R. Zapatero, Adibekyan, V., Alibert, Y., Prieto, C. Allende, Bouchy, F., Damasso, M., D'Odorico, V., Di Marcantonio, P., Ehrenreich, D., Curto, G. Lo, Santos, R. G'enova, Martins, C. J. A. P., Mehner, A., Micela, G., Molaro, P., Nunes, N., Palle, E., Sousa, S. G., Udry, S.
Publikováno v:
A&A, 690, A79 (2024)
Barnard's star is a primary target within the ESPRESSO guaranteed time observations (GTO) as it is the second closest neighbour to our Sun after the $\alpha$ Centauri stellar system. We present here a large set of 156 ESPRESSO observations of Barnard
Externí odkaz:
http://arxiv.org/abs/2410.00569
Autor:
Silva, A. R. Costa, Demangeon, O. D. S., Santos, N. C., Ehrenreich, D., Lovis, C., Chakraborty, H., Lendl, M., Pepe, F., Cristiani, S., Rebolo, R., Zapatero-Osorio, M. R., Adibekyan, V., Alibert, Y., Allart, R., Prieto, C. Allende, Silva, T. Azevedo, Borsa, F., Bourrier, V., Cristo, E., Di Marcantonio, P., Esparza-Borges, E., Figueira, P., Hernández, J. I. González, Herrero-Cisneros, E., Curto, G. Lo, Martins, C. J. A. P., Mehner, A., Nunes, N. J., Palle, E., Pelletier, S., Seidel, J. V., Silva, A. M., Sousa, S. G., Sozzetti, A., Steiner, M., Mascareño, A. Suárez, Udry, S.
Publikováno v:
Astronomy & Astrophysics, 689, A8, 15 (2024)
Ultra hot Jupiters (gas giants, Teq>2000 K) are intriguing exoplanets due to their extreme atmospheres. Their torrid daysides can be characterised using ground-based high-resolution emission spectroscopy. We search for signatures of neutral and singl
Externí odkaz:
http://arxiv.org/abs/2409.13519
Autor:
Blind, N., Shinde, M., Dinis, I., Restori, N., Chazelas, B., Fusco, T., Guyon, O., Kuehn, J., Lovis, C., Martinez, P., Motte, M., Sauvage, J. -F., Spang, A.
Publikováno v:
Proceedings Volume 13097, Adaptive Optics Systems IX; 130976U (2024)
RISTRETTO is the evolution of the original idea of coupling the VLT instruments SPHERE and ESPRESSO \cite{lovis_2016a}, aiming at High Dispersion Coronagraphy. RISTRETTO is a visitor instrument that should enable the characterization of the atmospher
Externí odkaz:
http://arxiv.org/abs/2409.08052
The RISTRETTO instrument, a proposed visible high-contrast, high-resolution spectrograph for the VLT, has the primary science goal of detecting reflected light from nearby exoplanets and characterizing their atmospheres. Specifically, it aims to atmo
Externí odkaz:
http://arxiv.org/abs/2409.04255
Autor:
Shinde, Muskan, Baron, Jana Anouk, Blind, Nicolas, Hagelberg, Janis, Lovis, Christophe, Wildi, François, Ségransan, Damien
Publikováno v:
Proc. SPIE 13097, Adaptive Optics Systems IX, 1309744 (29 August 2024)
In the near-infrared wavelength regime, atmospheric turbulence fluctuates at a scale of a few milliseconds, and its precise control requires the use of extreme adaptive optics (XAO) systems equipped with fast and sensitive detectors operating at kHz
Externí odkaz:
http://arxiv.org/abs/2409.04247
Autor:
Lovis, Christophe, Blind, Nicolas, Chazelas, Bruno, Shinde, Muskan, Bugatti, Maddalena, Restori, Nathanaël, Dinis, Isaac, Genolet, Ludovic, Hughes, Ian, Sordet, Michaël, Schnell, Robin, Rihs, Samuel, Crausaz, Adrien, Turbet, Martin, Billot, Nicolas, Fusco, Thierry, Neichel, Benoit, Sauvage, Jean-François, Diaz, Pablo Santos, Houelle, Mathilde, Blackman, Joshua, Lanotte, Audrey, Kühn, Jonas, Hagelberg, Janis, Guyon, Olivier, Martinez, Patrice, Spang, Alain, Mordasini, Christoph, Ehrenreich, David, Demory, Brice-Olivier, Bolmont, Emeline
Publikováno v:
Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130961I (18 July 2024)
RISTRETTO is a visible high-resolution spectrograph fed by an extreme adaptive optics (AO) system, to be proposed as a visitor instrument on ESO VLT. The main science goal of RISTRETTO is to pioneer the detection and atmospheric characterisation of e
Externí odkaz:
http://arxiv.org/abs/2409.02875
Autor:
Bourrier, V., Delisle, J. -B., Lovis, C., Cegla, H. M., Cretignier, M., Allart, R., Moulla, K. Al, Tavella, S., Attia, O., Mounzer, D., Vaulato, V., Steiner, M., Vrignaud, T., Mercier, S., Dumusque, X., Ehrenreich, D., Seidel, J. V., Wyttenbach, A., Dethier, W., Pepe, F.
High-resolution spectrographs open a detailed window onto the atmospheres of stars and planets. As the number of systems observed with different instruments grows, it is crucial to develop a standard in analyzing spectral time series of exoplanet tra
Externí odkaz:
http://arxiv.org/abs/2407.19012