Zobrazeno 1 - 10
of 95
pro vyhledávání: '"M L, Das"'
Autor:
Barraza, L. F., Gomes, R. L., Messias, Y. S., Leão, I. C., Almeida, L. A., Janot-Pacheco, E., Brito, A. C., Brito, F. A. C., Santana, J. V., Gonçalves, N. S., Chagas, M. L. das, Teixeira, M. A., De Medeiros, J. R., Martins, B. L. Canto
Publikováno v:
2022, ApJ, 924, 117B
Stellar rotation is a fundamental observable that drives different aspects of stellar and planetary evolution. In this work, we present an unprecedented manifold analysis of 160 B-type stars with light curves collected by the TESS space mission using
Externí odkaz:
http://arxiv.org/abs/2202.01022
Publikováno v:
A&A 650, A40 (2021)
Kepler-30 is a unique target to study stellar activity and rotation in a young solar-like star accompanied by a compact planetary system. We use about 4 years of high-precision photometry collected by the Kepler mission to investigate the fluctuation
Externí odkaz:
http://arxiv.org/abs/2103.15921
Autor:
de Freitas, D. B., Nepomuceno, M. M. F., Cordeiro, J. G., Chagas, M. L. Das, De Medeiros, J. R.
A multifractal formalism is employed to analyse high-precision time-series data of \textit{Kepler} stars with surface differential rotation traces. The multifractal detrended moving average analysis (MFDMA) algorithm has been explored to characterize
Externí odkaz:
http://arxiv.org/abs/1906.11911
Autor:
de Freitas, D. B., Nepomuceno, M. M. F., Rios, L. D. Alves, Chagas, M. L. Das, De Medeiros, J. R.
In the present study, high-precision time series photometry for the active \emph{Kepler} stars is described in the language of multifractals. We explore the potential of using the rescaled range analysis ($R/S$) and multifractal detrended moving aver
Externí odkaz:
http://arxiv.org/abs/1906.07331
Autor:
Sobrinho, R. Silva, Da Costa, A. D., Martins, B. L. Canto, Leão, I. C., da Silva, D. Freire, Teixeira, M. A., de Souza, M. Gomes, de Freitas, D. B., Bravo, J. P., Chagas, M. L. Das, De Medeiros, J. R.
Observations of circumstellar disks provide a powerful tool for our understanding of planetary systems dynamics. Analogs to the Solar System asteroid belts, debris disks result from the collision of the remaining solid material of the planet formatio
Externí odkaz:
http://arxiv.org/abs/1812.01592
Autor:
de Freitas, D. B., Nepomuceno, M. M. F., de Souza, M. Gomes, Leão, I. C., Chagas, M. L. Das, Costa, A. D., Martins, B. L. Canto, De Medeiros, J. R.
In the present study, we investigate the multifractal nature of a long-cadence time series observed by the \textit{Kepler} mission for a sample of 34 M dwarf stars and the Sun in its active phase. Using the Multifractal Detrending Moving Average algo
Externí odkaz:
http://arxiv.org/abs/1706.02935
Autor:
de Freitas, D. B., Nepomuceno, M. M. F., Junior, P. R. V. de Moraes, Lopes, C. E. F., Leão, I. C., Chagas, M. L. Das, Bravo, J. P., Costa, A. D., Martins, B. L. Canto, De Medeiros, J. R.
In present paper, we investigate the multifractality signatures in hourly time series extracted from CoRoT spacecraft database. Our analysis is intended to highlight the possibility that astrophysical time series can be members of a particular class
Externí odkaz:
http://arxiv.org/abs/1608.04432
Autor:
Chagas, M. L. Das, Bravo, J. P., Costa, A. D., Lopes, C. E. Ferreira, Sobrinho, R. Silva, Paz-Chinchón, F., Leão, I. C., Valio, A., de Freitas, D. B., Martins, B. L. Canto, Lanza, A. F., De Medeiros, J. R.
The present study reports the discovery of Sun-like stars, namely main-sequence stars with $T_{\rm eff}$, $\log g$ and rotation periods $P_{rot}$ similar to solar values, presenting evidence of surface differential rotation. An autocorrelation of the
Externí odkaz:
http://arxiv.org/abs/1608.01549
Autor:
Lopes, C. E. Ferreira, Neves, V., Leão, I. C., de Freitas, D. B., Martins, B. L. Canto, da Costa, A. D., Paz-Chinchón, F., Chagas, M. L. Das, Baglin, A., Janot-Pacheco, E., De Medeiros, J. R.
Publikováno v:
A&A 583, A122 (2015)
For 6 years the Convection, Rotation, and Planetary Transits (CoRoT) space mission has acquired photometric data from more than one hundred thousand point sources towards and directly opposite from the inner and outer regions of the Galaxy. The high
Externí odkaz:
http://arxiv.org/abs/1508.05358
Autor:
Costa, A. D., Martins, B. L. Canto, Bravo, J. P., Paz-Chinchón, F., Chagas, M. L. das, Leão, I. C., de Oliveira, G. Pereira, da Silva, R. Rodrigues, Roque, S., de Oliveira, L. L. A., da Silva, D. Freire, De Medeiros, J. R.
Rapidly rotating giant stars are relatively rare and may represent important stages of stellar evolution, resulting from stellar coalescence of close binary systems or accretion of sub-stellar companions by their hosting stars. In the present letter
Externí odkaz:
http://arxiv.org/abs/1506.06644