Zobrazeno 1 - 10
of 157
pro vyhledávání: '"Guiglion, P"'
Autor:
Khalatyan, A., Anders, F., Chiappini, C., Queiroz, A. B. A., Nepal, S., Ponte, M. dal, Jordi, C., Guiglion, G., Valentini, M., Elipe, G. Torralba, Steinmetz, M., Pantaleoni-González, M., Malhotra, S., Jiménez-Arranz, Ó., Enke, H., Casamiquela, L., Ardèvol, J.
Publikováno v:
A&A 691, A98 (2024)
In this paper, we explore the feasibility of using machine learning regression as a method of extracting basic stellar parameters and line-of-sight extinctions from spectro-photometric data. We built a stable gradient-boosted random-forest regressor
Externí odkaz:
http://arxiv.org/abs/2407.06963
Autor:
Worley, C. C., Smiljanic, R., Magrini, L., Frasca, A., Franciosini, E., Montes, D., Feuillet, D. K., Tabernero, H. M., Hernández, J. I. González, Villanova, S., Mikolaitis, Š., Lind, K., Tautvaišienė, G., Casey, A. R., Korn, A. J., Bonifacio, P., Soubiran, C., Caffau, E., Guiglion, G., Merle, T., Hourihane, A., Gonneau, A., François, P., Randich, S., Gilmore, G., Lewis, J. R., Murphy, D. N. A., Jeffries, R. D., Koposov, S. E., Blomme, R., Lanzafame, A. C., Bensby, T., Bragaglia, A., Alfaro, E. J., Walton, N. A., Vallenari, A., Prusti, T., Biazzo, K., Jofré, P., Zaggia, S., Heiter, U., Marfil, E., Jiménez-Esteban, F., Albarrán, M. L. Gutiérrez, Morbidelli, L.
The Gaia-ESO Survey is an European Southern Observatory (ESO) public spectroscopic survey that targeted $10^5$ stars in the Milky Way covering the major populations of the disk, bulge and halo. The observations were made using FLAMES on the VLT obtai
Externí odkaz:
http://arxiv.org/abs/2402.06076
Autor:
Nepal, Samir, Chiappini, Cristina, Queiroz, Anna B. A., Guiglion, Guillaume, Montalbán, Josefina, Steinmetz, Matthias, Miglio, Andrea, Khalatyan, Arman
Publikováno v:
A&A 688, A167 (2024)
JWST has recently detected numerous disc galaxies at high-redshifts and there have been observations of cold disc galaxies at z > 4 with ALMA. In the Milky Way, recent studies find metal-poor stars in cold disc orbits, suggesting an ancient disc. We
Externí odkaz:
http://arxiv.org/abs/2402.00561
Recently Lian et al. (2023), thanks to Gaia-ESO data, studied the chemical evolution of neutron-capture elements in the regime [Fe/H]>-1. We aim here to complement this study down to [Fe/H]=-3, and focus on Ba, Y, Sr, and abundance ratios of [Ba/Y] a
Externí odkaz:
http://arxiv.org/abs/2311.05459
Autor:
Zhong, Fucheng, Napolitano, Nicola R., Heneka, Caroline, Li, Rui, Bauer, Franz Erik, Bouche, Nicolas, Comparat, Johan, Kim, Young-Lo, Krogager, Jens-Kristian, Longhetti, Marcella, Loveday, Jonathan, Roukema, Boudewijn F., Rouse, Benedict L., Salvato, Mara, Tortora, Crescenzo, Assef, Roberto J., Cassarà, Letizia P., Costantin, Luca, Croom, Scott, Davies, Luke J M, Fritz, Alexander, Guiglion, Guillaume, Humphrey, Andrew, Pompei, Emanuela, Ricci, Claudio, Sifón, Cristóbal, Tempel, Elmo, Zafar, Tayyaba
Large sky spectroscopic surveys have reached the scale of photometric surveys in terms of sample sizes and data complexity. These huge datasets require efficient, accurate, and flexible automated tools for data analysis and science exploitation. We p
Externí odkaz:
http://arxiv.org/abs/2311.04146
Autor:
Lian, Jianhui, Storm, Nicholas, Guiglion, Guillaume, Serenelli, Aldo, Cote, Benoit, Karakas, Amanda I., Boardman, Nick, Bergemann, Maria
Most heavy elements beyond the iron peak are synthesized via neutron capture processes. The nature of the astrophysical sites of neutron capture processes is still very unclear. In this work we explore the observational constraints of the chemical ab
Externí odkaz:
http://arxiv.org/abs/2308.01111
Autor:
Guiglion, G., Nepal, S., Chiappini, C., Khoperskov, S., Traven, G., Queiroz, A. B. A., Steinmetz, M., Valentini, M., Fournier, Y., Vallenari, A., Youakim, K., Bergemann, M., Mészáros, S., Lucatello, S., Sordo, R., Fabbro, S., Minchev, I., Tautvaišienė, G., Mikolaitis, Š., Montalbán, J.
In June 2022, Gaia DR3 has provided the astronomy community with about one million spectra from the Radial Velocity Spectrometer (RVS) covering the CaII triplet region. However, one-third of the published spectra have 15
Externí odkaz:
http://arxiv.org/abs/2306.05086
Autor:
Ratcliffe, Bridget, Minchev, Ivan, Anders, Friedrich, Khoperskov, Sergey, Guiglion, Guillaume, Buck, Tobias, Cunha, Katia, Queiroz, Anna, Nitschelm, Christian, Meszaros, Szabolcs, Steinmetz, Matthias, de Jong, Roelof S., Nepal, Samir, Lane, Richard R., Sobeck, Jennifer
Chemical abundances are an essential tool in untangling the Milky Way's enrichment history. However, the evolution of the interstellar medium abundance gradient with cosmic time is lost as a result of radial mixing processes. For the first time, we q
Externí odkaz:
http://arxiv.org/abs/2305.13378
Autor:
Jeffries, R. D., Jackson, R. J., Wright, Nicholas J., Weaver, G., Gilmore, G., Randich, S., Bragaglia, A., Korn, A. J., Smiljanic, R., Biazzo, K., Casey, A. R., Frasca, A., Gonneau, A., Guiglion, G., Morbidelli, L., Prisinzano, L., Sacco, G. G., Tautvaišienė, G., Worley, C. C., Zaggia, S.
We present an empirical model of age-dependent photospheric lithium depletion, calibrated using a large, homogeneously-analysed sample of 6200 stars in 52 open clusters, with ages from 2--6000 Myr and $-0.3<{\rm [Fe/H}]<0.2$, observed in the Gaia-ESO
Externí odkaz:
http://arxiv.org/abs/2304.12197
Autor:
Hourihane, A., Francois, P., Worley, C. C., Magrini, L., Gonneau, A., Casey, A. R., Gilmore, G., Randich, S., Sacco, G. G., Recio-Blanco, A., Korn, A. J., Prieto, C. Allende, Smiljanic, R., Blomme, R., Bragaglia, A., Walton, N. A., Van Eck, S., Bensby, T., Lanzafame, A, Frasca, A., Franciosini, E., Damiani, F., Lind, K., Bergemann, M., Bonifacio, P., Hill, V., Lobel, A., Montes, D., Feuillet, D. K., Tautvaisene, G., Guiglion, G., Tabernero, H. M., Hernandez, J. I. Gonzalez, Gebran, M., Van der Swaelmen, M., Mikolaitis, Daflon, S., Merle, T., Morel, T., Lewis, J. R., Solares, E. A. Gonzalez, Murphy, D. N. A., Jeffries, R. D., Jackson, R. J., Feltzing, S., Prusti, T., Carraro, G., Biazzo, K., Prisinzano, L., Jofre, P., Zaggia, S., Drazdauskas, A., Stonkute, E., Marfil, E., Jimenez-Esteban, F., Mahy, L., Albarran, M. L. Gutierrez, Berlanas, S. R., Santos, W., Morbidelli, L., Spina, L., Minkeviciute, R.
Publikováno v:
A&A 676, A129 (2023)
The Gaia-ESO Survey is a public spectroscopic survey that has targeted $\gtrsim10^5$ stars covering all major components of the Milky Way from the end of 2011 to 2018, delivering its public final release in May 2022. Unlike other spectroscopic survey
Externí odkaz:
http://arxiv.org/abs/2304.07720