Search Results - "Leão, I. C"

A Portrait of the Rotation of Ultra-cool Dwarfs Revealed by TESS by Fontinele, D. O., de Lima, P. D. S., Messias, Y. S., Gomes, R. L., Ferreira Lopes, C. E., Canto Martins, B. L., Leão, I. C., De Araújo, J. M., Janot Pacheco, E., De Medeiros, J. R.

“…Abstract This study presents the results of a search for rotation signatures in 250 Gaia Data Release 3 ultra-cool dwarfs (UCDs) with TESS light curves (LCs)…”
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Pulsation in TESS Objects of Interest by Gomes, R. L., Martins, B. L. Canto, Fontinele, D. O., Almeida, L. A., Freire, R. Alves, Brito, A. C., de Amorim, R. G. S. B., Lopes, C. E. Ferreira, Hazarika, D., Janot-Pacheco, E., Leão, I. C., Messias, Y. S., Souza, R. A. A., De Medeiros, J. R.

“…Abstract We report the discovery of three Transiting Exoplanet Survey Satellite Objects of Interest (TOI) with signatures of pulsation, observed in more than…”
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Spectroscopic and astrometric radial velocities: Hyades as a benchmark by Leão, I C, Pasquini, L, Ludwig, H-G, de Medeiros, J R

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Revealing the non-linear behaviour of the lensed quasar Q0957+561 by Belete, A Bewketu, Canto Martins, B L, Leão, I C, De Medeiros, J R

“…ABSTRACT Knowledge about how the non-linear behaviour of the intrinsic signal from lensed background sources changes on its path to the observer provides much…”
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Rotation Signature of TESS B-type Stars. A Comprehensive Analysis by 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., das Chagas, M. L., Teixeira, M. A., De Medeiros, J. R., Canto Martins, B. L.

“…Abstract Stellar rotation is a fundamental observable that drives different aspects of stellar and planetary evolution. In this work, we present an…”
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A Dearth of Close-in Planets around Rapidly Rotating Stars or a Dearth of Data? by Messias, Y. S., de Oliveira, L. L. A., Gomes, R. L., Arruda Gonçalves, M. I., Canto Martins, B. L., Leão, I. C., De Medeiros, J. R.

“…Abstract A dearth of close-in planets orbiting rapid rotators was reported almost a decade ago. According to this view, only slowly spinning stars with…”
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The nature of flux variations in the continua and broad-line regions of selected active galactic nuclei by Bewketu Belete, A, Goicoechea, L J, Canto Martins, B L, Leão, I C, De Medeiros, J R

“…ABSTRACT We present a multifractal analysis of the long-term light curves of a small sample of type 1 active galactic nuclei: NGC 4151, Arp 102B, 3C 390.3,…”
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The VISTA Variables in the Vía Láctea infrared variability catalogue (VIVA-I) by Ferreira Lopes, C E, Cross, N J G, Catelan, M, Minniti, D, Hempel, M, Lucas, P W, Angeloni, R, Jablonsky, F, Braga, V F, Leão, I C, Herpich, F R, Alonso-García, J, Papageorgiou, A, Pichara, K, Saito, R K, Bradley, A J, Beamin, J C, Cortés, C, De Medeiros, J R, Russell, Christopher M P

“…ABSTRACT High extinction and crowding create a natural limitation for optical surveys towards the central regions of the Milky Way, where the gas and dust are…”
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New Suns in the Cosmos. IV. The Multifractal Nature of Stellar Magnetic Activity in Kepler Cool Stars by de Freitas, D. B., Nepomuceno, M. M. F., Gomes de Souza, M., Leão, I. C., Das Chagas, M. L., Costa, A. D., Canto Martins, B. L., De Medeiros, J. R.

“…In the present study, we investigate the multifractal nature of a long-cadence time series observed by the Kepler mission for a sample of 34 M dwarf stars and…”
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TOI-220 b: a warm sub-Neptune discovered by TESS by Hoyer, S, Gandolfi, D, Armstrong, D J, Deleuil, M, Acuña, L, de Medeiros, J R, Goffo, E, Lillo-Box, J, Delgado Mena, E, Lopez, T A, Santerne, A, Sousa, S, Fridlund, M, Adibekyan, V, Collins, K A, Serrano, L M, Cortés-Zuleta, P, Howell, S B, Deeg, H, Aguichine, A, Barragán, O, Bryant, E M, Canto Martins, B L, Collins, K I, Cooke, B F, Díaz, R F, Esposito, M, Furlan, E, Hojjatpanah, S, Jackman, J, Jenkins, J M, Jensen, E L N, Latham, D W, Leão, I C, Matson, R A, Nielsen, L D, Osborn, A, Otegi, J F, Rodler, F, Sabotta, S, Scott, N J, Seager, S, Stockdale, C, Strøm, P A, Vanderspek, R, Van Eylen, V, Wheatley, P J, Winn, J N, Almenara, J M, Barrado, D, Barros, S C C, Bayliss, D, Bouchy, F, Boyd, P T, Cabrera, J, Cochran, W D, Demangeon, O, Doty, J P, Dumusque, X, Figueira, P, Fong, W, Grziwa, S, Hatzes, A P, Kabáth, P, Knudstrup, E, Korth, J, Livingston, J H, Luque, R, Mousis, O, Mullally, S E, Osborn, H P, Pallé, E, Persson, C M, Redfield, S, Santos, N C, Smith, J, Šubjak, J, Twicken, J D, Udry, S, Yahalomi, D A

“…ABSTRACT In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by…”
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Multifractality signatures in quasars time series – I. 3C 273 by Belete, A Bewketu, Bravo, J P, Canto Martins, B L, Leão, I C, De Araujo, J M, De Medeiros, J R

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A wavelet analysis of photometric variability in Kepler white dwarf stars by de Lira, S R, Bravo, J P, Leão, I C, da Costa, A D, Canto Martins, B L, de Freitas, D B, De Medeiros, J R

“…Abstract This work describes a wavelet analysis of 14 Kepler white dwarf stars, in order to confirm their photometric variability behaviour and to search for…”
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Cosmological Evolution of Quasar Radio Emission in the View of Multifractality by Belete, A. Bewketu, Femmam, Smain, Tornikosk, Merja, Lähteenmäki, Anne, Tammi, Joni, Leão, I. C., Canto Martins, B. L., Medeiros, J. R. De

“…Variations in scaling behavior in the flux and emissions of distant astronomical sources with respect to their cosmic time are important phenomena that can…”
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A Novel Approach to Study the Variability of NGC 5548 by Belete, A. Bewketu, Goicoechea, L. J., Leão, I. C., Martins, B. L. Canto, Medeiros, J. R. De

“…Understanding the properties of the continuum radiation and broad emission lines of active galactic nuclei provides significant information not only to model…”
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NEW SUNS IN THE COSMOS. III. MULTIFRACTAL SIGNATURE ANALYSIS by Freitas, D. B. de, Nepomuceno, M. M. F., Junior, P. R. V. de Moraes, Lopes, C. E. F., Chagas, M. L. Das, Bravo, J. P., Costa, A. D., Martins, B. L. Canto, Medeiros, J. R. De, Leão, I. C.

“…ABSTRACT In the present paper, we investigate the multifractality signatures in hourly time series extracted from the CoRoTspacecraft database. Our analysis is…”
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On the Incidence of Wise Infrared Excess Among Solar Analog, Twin, and Sibling Stars by Da Costa, A. D., Martins, B. L. Canto, Leão, I. C., Lima Jr, J. E., Silva, D. Freire da, Freitas, D. B. de, Medeiros, J. R. De

“…This study presents a search for infrared (IR) excess in the 3.4, 4.6, 12, and 22 m bands in a sample of 216 targets, composed of solar sibling, twin, and…”
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Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars by Bright, S. N., Chesneau, O., Clayton, G. C., De Marco, O., Leão, I. C., Nordhaus, J., Gallagher, J. S.

“…We are investigating the formation and evolution of dust around the hydrogen-deficient supergiants known as R Coronae Borealis (RCB) stars. We aim to determine…”
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MEASURING THE ALFVÉNIC NATURE OF THE INTERSTELLAR MEDIUM: VELOCITY ANISOTROPY REVISITED by BURKHART, BLAKESLEY, Lazarian, A, Leao, I C, de Medeiros, J R, Esquivel, A

“…The dynamics of the interstellar medium (ISM) are strongly affected by turbulence, which shows increased anisotropy in the presence of a magnetic field. We…”
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New Suns in the Cosmos II: differential rotation in Kepler Sun-like stars by Chagas, M L Das, Bravo, J P, Costa, A D, Lopes, C E Ferreira, Sobrinho, R Silva, Paz-Chinchon, F, Leao, I C, Valio, A, de Freitas, D B, Canto Martins, B L, Lanza, A F, DeMedeiros, J R

“…The present study reports the discovery of Sun-like stars, namely main-sequence stars with T^sub eff^, log g and rotation periods P^sub rot^ similar to solar…”
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THE ROTATIONAL BEHAVIOR OF KEPLER STARS WITH PLANETS by Paz-Chinchón, F., Leão, I. C., Bravo, J. P., de Freitas, D. B., Lopes, C. E. Ferreira, Alves, S., Catelan, M., Martins, B. L. Canto, De Medeiros, J. R.

“…ABSTRACT We analyzed the host stars of the present sample of confirmed planets detected by Kepler and Kepler Objects of Interest to compute new photometric…”
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