Zobrazeno 1 - 10
of 3 213
pro vyhledávání: '"D Do"'
Autor:
Barros, Cauã Ferreira, Azevedo, Bruna Borges, Neto, Valdemar Vicente Graciano, Kassab, Mohamad, Kalinowski, Marcos, Nascimento, Hugo Alexandre D. do, Bandeira, Michelle C. G. S. P.
The exponential growth of text-based data in domains such as healthcare, education, and social sciences has outpaced the capacity of traditional qualitative analysis methods, which are time-intensive and prone to subjectivity. Large Language Models (
Externí odkaz:
http://arxiv.org/abs/2411.14473
Autor:
Wargelin, B. J., Saar, S. H., Irving, Z. A., Slavin, J. D., Ratzlaff, P., Nascimento Jr, J. -D. do
Proxima Cen (GJ 551; dM5.5e) is one of only about a dozen fully convective stars known to have a stellar cycle, and the only one to have long-term X-ray monitoring. A previous analysis found that X-ray and mid-UV observations, particularly two epochs
Externí odkaz:
http://arxiv.org/abs/2411.04252
Autor:
Coelho, H. R., Miglio, A., Morel, T., Lagarde, N., Bossini, D., Chaplin, W. J., Degl'Innocenti, S., Dell'Omodarme, M., Garcia, R. A., Handberg, R., Hekker, S., Huber, D., Lund, M. N., Mathur, S., Moroni, P. G. Prada, Mosser, B., Serenelli, A., Rainer, M., Nascimento Jr., J. D. do, Poretti, E., Mathias, P., Valle, G., Tio, P. Dal, Duarte, T.
Photometric time series gathered by space telescopes such as CoRoT and Kepler allow to detect solar-like oscillations in red-giant stars and to measure their global seismic constraints, which can be used to infer global stellar properties (e.g. masse
Externí odkaz:
http://arxiv.org/abs/2312.11233
Autor:
Velloso, E. N., Anthony, F., Nascimento Jr, J. D. do, Silveira, L. F. Q., Hall, J., Saar, S. H.
Publikováno v:
The Astrophysical Journal Letters, Volume 945, Issue 1, id.L12, 2023
The temporal analysis of stellar activity evolution is usually dominated by a complex trade-off between model complexity and interpretability, often by neglecting the non-stationary nature of the process. Recent studies appear to indicate that the pr
Externí odkaz:
http://arxiv.org/abs/2310.16974
Autor:
Jahandar, Farbod, Doyon, René, Artigau, Étienne, Cook, Neil J., Cadieux, Charles, Lafrenière, David, Forveille, Thierry, Donati, Jean-François, Fouqué, Pascal, Carmona, Andrés, Cloutier, Ryan, Cristofari, Paul, Gaidos, Eric, da Silva, João Gomes, Malo, Lison, Martioli, Eder, Nascimento Jr., J. -D. do, Pelletier, Stefan, Vandal, Thomas, Venn, Kim
Determination of fundamental parameters of stars impacts all fields of astrophysics, from galaxy evolution to constraining the internal structure of exoplanets. This paper presents a detailed spectroscopic analysis of Barnard's star that compares an
Externí odkaz:
http://arxiv.org/abs/2310.12125
Autor:
Amazo-Gómez, E. M., Alvarado-Gómez, J. D., Poppenhaeger, K., Hussain, G. A. J., Wood, B. E., Drake, J. J., Nascimento Jr., J. -D. do, Anthony, F., Sanz-Forcada, J., Stelzer, B., Donati, J. F., Del Sordo, F., Damasso, M., Redfield, S., König, P. C., Hébrard, G., Miles-Páez, P. A.
A comprehensive multi-wavelength campaign has been carried out to probe stellar activity and variability in the young Sun-like star $\iota$-Horologii. We present the results from long-term spectropolarimetric monitoring of the system by using the ult
Externí odkaz:
http://arxiv.org/abs/2307.01744
The prediction of academic dropout, with the aim of preventing it, is one of the current challenges of higher education institutions. Machine learning techniques are a great ally in this task. However, attention is needed in the way that academic dat
Externí odkaz:
http://arxiv.org/abs/2305.08600
Autor:
Cadieux, Charles, Doyon, René, Plotnykov, Mykhaylo, Hébrard, Guillaume, Jahandar, Farbod, Artigau, Étienne, Valencia, Diana, Cook, Neil J., Martioli, Eder, Vandal, Thomas, Donati, Jean-François, Cloutier, Ryan, Narita, Norio, Fukui, Akihiko, Hirano, Teruyuki, Bouchy, François, Cowan, Nicolas B., Gonzales, Erica J., Ciardi, David R., Stassun, Keivan G., Arnold, Luc, Benneke, Björn, Boisse, Isabelle, Bonfils, Xavier, Carmona, Andrés, Cortés-Zuleta, Pía, Delfosse, Xavier, Forveille, Thierry, Fouqué, Pascal, da Silva, João Gomes, Jenkins, Jon M., Kiefer, Flavien, Kóspál, Ágnes, Lafrenière, David, Martins, Jorge H. C., Moutou, Claire, Nascimento Jr., J. -D. do, Ould-Elhkim, Merwan, Pelletier, Stefan, Twicken, Joseph D., Bouma, Luke G., Cartwright, Scott, Darveau-Bernier, Antoine, Grankin, Konstantin, Ikoma, Masahiro, Kagetani, Taiki, Kawauchi, Kiyoe, Kodama, Takanori, Kotani, Takayuki, Latham, David W., Menou, Kristen, Ricker, George, Seager, Sara, Tamura, Motohide, Vanderspek, Roland, Watanabe, Noriharu
Publikováno v:
AJ, 164, 96 (2022)
Exploring the properties of exoplanets near or inside the radius valley provides insights on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452 b, a transiting s
Externí odkaz:
http://arxiv.org/abs/2208.06333
Autor:
Anthony, Francys, Núñez, Alejandro, Agüeros, Marcel A., Curtis, Jason L., Nascimento, Jr., J. -D. do, Machado, João M., Mann, Andrew W., Newton, Elisabeth R., Rampalli, Rayna, Thao, Pa Chia, Wood, Mackenna L.
The evolution of magnetism in late-type dwarfs remains murky, as we can only weakly predict levels of activity for M dwarfs of a given mass and age. We report results from our spectroscopic survey of M dwarfs in the Southern Continuous Viewing Zone (
Externí odkaz:
http://arxiv.org/abs/2204.04700
Autor:
Herald, A., Udalski, A., Bozza, V., Rota, P., Bond, I. A., Yee, J. C., Sajadian, S., Mroz, P., Poleski, R., Skowron, J., Szymanski, M. K., Soszynski, I., Pietrukowicz, P., Kozlowski, S., Ulaczyk, K., Rybicki, K. A., Iwanek, P., Wrona, M., Gromadzki, M., Abe, F., Barry, R., Bennett, D. P., Bhattacharya, A., Fukui, A., Fujii, H., Hirao, Y., Itow, Y., Kirikawa, R., Kondo, I., Koshimoto, N., Matsubara, Y., Matsumoto, S., Miyazaki, S., Muraki, Y., Olmschenk, G., Ranc, C., Okamura, A., Rattenbury, N. J., Satoh, Y., Sumi, T., Suzuki, D., Silva, S. Ishitani, Toda, T., Tristram, P. J., Vandorou, A., Yama, H., Beichman, C. A., Bryden, G., Novati, S. Calchi, Carey, S., Gaudi, B. S., Gould, A., Henderson, C. B., Johnson, S., Shvartzvald, Y., Zhu, W., Dominik, M., Hundertmark, M., Jorgensen, U. G., Longa-Pena, P., Skottfelt, J., Tregloan-Reed, J., Bach-Moller, N., Burgdorf, M., D'Ago, G., Haikala, L., Hitchcock, J., Khalouei, E., Peixinho, N., Rahvar, S., Snodgrass, C., Southworth, J., Spyratos, P., Zang, W., Yang, H., Mao, S., Bachelet, E., Maoz, D., Street, R. A., Tsapras, Y., Christie, G. W., Cooper, T., de Almeida, L., Nascimento Jr, J. -D. do, Green, J., Han, C., Hennerley, S., Marmont, A., McCormick, J., Monard, L. A. G., Natusch, T., Pogge, R.
Publikováno v:
A&A 663, A100 (2022)
Context. Brown dwarfs are poorly understood transition objects between stars and planets, with several competing mechanisms having been proposed for their formation. Mass measurements are generally difficult for isolated objects but also for brown dw
Externí odkaz:
http://arxiv.org/abs/2203.04034