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Search Results: 1 - 10 of 388555 matches for " R. L.;Borsato "
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TASTE. II. A new observational study of transit time variations in HAT-P-13b
V. Nascimbeni,G. Piotto,L. R. Bedin,M. Damasso,L. Malavolta,L. Borsato
Physics , 2011, DOI: 10.1051/0004-6361/201116830
Abstract: TASTE (The Asiago Search for Transit timing variations of Exoplanets) project is collecting high-precision, short-cadence light curves for a selected sample of transiting exoplanets. It has been claimed that the hot jupiter HAT-P-13b suddenly deviated from a linear ephemeris by $\sim 20$ min, implying that there is a perturber in the system. Using five new transits, we discuss the plausibility of this transit time variation (TTV), and show that a periodic signal should not be excluded. More follow-up observations are required to constrain the mass and the orbit of the hypothetical perturber.
TASTE IV. Refining ephemeris and orbital parameters for HAT-P-20b and WASP-1b
V. Granata,V. Nascimbeni,G. Piotto,L. R. Bedin,L. Borsato,A. Cunial,M. Damasso,L. Malavolta
Physics , 2014, DOI: 10.1002/asna.201412072
Abstract: We present four new light curves of transiting exoplanets WASP-1b and HAT-P-20b, observed within the TASTE (The Asiago Search for Transit timing variations of Exoplanets) project. We re-analyzed light curves from the literature in a homogeneous way, calculating a refined ephemeris and orbital-physical parameters for both objects. WASP-1b does not show any significant Transit Timing Variation signal at the 120 s-level. As for HAT-P-20b, we detected a deviation from our re-estimated linear ephemeris that could be ascribed to the presence of a perturber or, more probably, to a previously unnoticed high level of stellar activity. The rotational period of HAT-P-20 A we obtained from archival data (P_rot ~ 14.5 days), combined with its optical variability and strong emission of CaII H&K lines, is consistent with a young stellar age (< 1 Gyr) and support the hypothesis that stellar activity may be responsible of the measured deviations of the transit times.
KOI-372: a young extrasolar system with two giant planets on wide and eccentric orbits
L. Mancini,J. Lillo-Box,J. Southworth,L. Borsato,D. Gandolfi,S. Ciceri,D. Barrado,R. Brahm,Th. Henning
Physics , 2015,
Abstract: We confirm the planetary nature of KOI-372b (aka Kepler object of interest K00372.01), a giant transiting exoplanet orbiting a solar-analog G2V star. The mass of KOI-372b and the eccentricity of its orbit were accurately derived thanks to a series of precise radial velocity measurements obtained with the CAFE spectrograph mounted on the CAHA 2.2-m telescope. A simultaneous fit of the radial-velocity data and Kepler photometry revealed that KOI-372b is a dense Jupiter-like planet with a mass of Mp=3.25 Mjup and a radius of Rp=0.882 Rjup. KOI-372b is moving on a quite eccentric orbit, e=0.172, making a complete revolution around its parent star in 125.6 days. The semi-major axis of the orbit is 0.4937 au, implying that the planet is close to its habitable zone (roughly 0.5 au from it). By analysing the mid-transit times of the 12 transit events of KOI-372b recorded by the Kepler spacecraft, we found a clear transit time variation, which is attributable to the presence of a planet c in a wider orbit. We estimated that KOI-372c has a mass between 0.13 and 0.31 Mjup, also revolving on an eccentric orbit (e=0.17-0.24) in roughly 460 days, at a mean distance of 1.2 au from the host star, within the boundaries of its habitable zone. The analysis of the CAFE spectra revealed a relatively high photospheric lithium content, A(Li)=2.48 dex, suggesting that the parent star is relatively young. From a gyrochronological analysis, we estimate that the age of this planetary system is 1.0 Gyr.
Variable stars in one open cluster within the Kepler/K2-Campaign-5 field: M 67 (NGC 2682)
D. Nardiello,M. Libralato,L. R. Bedin,G. Piotto,P. Ochner,A. Cunial,L. Borsato,V. Granata
Physics , 2015, DOI: 10.1093/mnras/stv2439
Abstract: In this paper we continue the release of high-level data products from the multiyear photometric survey collected at the 67/92 cm Schmidt Telescope in Asiago. The primary goal of the survey is to discover and to characterise variable objects and exoplanetary transits in four fields containing five nearby open clusters spanning a broad range of ages. This second paper releases a photometric catalogue, in five photometric bands, of the Solar-age, Solar-metallicity open cluster M 67 (NGC 2682). Proper motions are derived comparing the positions observed in 2013 at the Asiago's Schmidt Telescope with those extracted from WFI@2.2m MPG/ESO images in 2000. We also analyse the variable sources within M 67. We detected 68 variables, 43 of which are new detection. Variable periods and proper-motion memberships of a large majority of sources in our catalogue are improved with respect to previous releases. The entire catalogue will be available in electronic format. Besides the general interest on an improved catalogue, this work will be particularly useful because of: (1) the imminent release of Kepler/K2 Campaign-5 data of this cluster, for which our catalogue will provide an excellent, high spatial resolution input list, and (2) characterisation of the M 67 stars which are targets of intense HARPS and HARPS-N radial-velocity surveys for planet search.
Ulcera??es orais e genitais como manifesta??o inicial de leucemia em crian?a
Silva, Karina;Higa, Marcelo;Terreri, Maria Teresa de S. L. R. A.;Borsato, Maria Luisa;Hilário, Maria Odete E.;
Revista Paulista de Pediatria , 2008, DOI: 10.1590/S0103-05822008000100014
Abstract: objective: increase awareness among pediatricians about the presence of aphtous oral lesions and genital ulcers as an initial manifestation of leukemia. case description: a ten-year-old girl, who presented oral and genital ulcers, with a diagnostic hypothesis of behcet disease. due to persistent leucopenia, myelograms were performed and, initially, suggested a myelodysplastic syndrome, which progressed to an acute myeloid leukemia. comments: the authors would like to alert about the rarity of this association and the absence of similar reported cases in the pediatric literature.
Simulation of NaCl and KCl mass transfer during salting of Prato cheese in brine with agitation: a numerical solution
Bona, E.;Carneiro, R. L.;Borsato, D.;Silva, R. S. S. F.;Fidelis, D. A. S.;Silva, L. H. Monken e;
Brazilian Journal of Chemical Engineering , 2007, DOI: 10.1590/S0104-66322007000300004
Abstract: the association of dietary nacl with arterial hypertension has led to a reduction in the levels of this salt in cheeses. for salting, kcl has been used as a partial substitute for nacl, which cannot be completely substituted without affecting product acceptability. in this study a sensorially adequate saline solution (nacl/kcl) was simultaneously diffused during salting of prato cheese in brine with agitation. the simultaneous multicomponent diffusion during the process was modeled with fick?s second generalized law. the system of partial differential equations formed was solved by the finite element method (fem). in the experimental data concentration the deviation for nacl was of 7.3% and for kcl of 5.4%, both of which were considered acceptable. the simulation of salt diffusion will allow control and modulation of salt content in prato cheese, permitting the prediction of final content from initial conditions.
Osteopetrose maligna: transplante de medula óssea
Borsato, Maria L.;Castro, Helaine C.;Pizza, Maria;Silva, Helena R. M.;Luporini, Silvia M.;Tanaka, Paula Y.;Castro, Nelson S.;Bruniera, Paula;Barros, José C. A.;
Revista Brasileira de Hematologia e Hemoterapia , 2008, DOI: 10.1590/S1516-84842008000200019
Abstract: osteopetrosis is an inherited disorder characterized by the inability to reabsorb and remodel bone due to osteoclast dysfunction. the encroachment by bone and mineralized cartilage of the medullary cavities leads to extramedullary hematopoiesis (hepatosplenomegaly) and cranial-nerve foramina leads to blindness, auditory nerve damage, and occulomotor and facial nerve palsies. defective bone re-absorption also leads to macrocephaly, frontal bossing, hypertelorism, exophthalmos, increased intracranial pressure, retarded tooth eruption, retarded linear growth and psychomotor delay. death occurs within the first years of life. the only curative therapy is allogeneic bone marrow transplantation with a hla-identical donor, which restores hematopoiesis, monocyte-macrophage function and bone recovery, but there is no sensorial deficit restoration once present. the authors report two cases of allogeneic bone marrow transplant for infantile malignant osteopetrosis. the first child, on day 1260 after bone marrow transplantation (bmt), showed radiologic bone recovery and no progression of neurological deficits with a bone biopsy showing no signs of osteopetrosis. the second child showed signs of bone re-absorption and no progression of neurological deficits on day 700. the authors emphasize the importance of early diagnosis of osteopetrosis and the necessity of bone marrow transplantation before neurological deficits have begun.
Variable stars in two open clusters within the Kepler 2-Campaign-0 field: M 35 and NGC 2158
D. Nardiello,L. R. Bedin,V. Nascimbeni,M. Libralato,A. Cunial,G. Piotto,A. Bellini,L. Borsato,K. Brogaard,V. Granata,L. Malavolta,A. F. Marino,A. P. Milone,P. Ochner,S. Ortolani,L. Tomasella,M. Clemens,M. Salaris
Physics , 2014, DOI: 10.1093/mnras/stu2697
Abstract: We present a multi-year survey aimed at collecting (1) high-precision (~5 milli-mag), (2) fast-cadence (~3 min), and (3) relatively long duration (~10 days) multi-band photometric series. The goal of the survey is to discover and characterize efficiently variable objects and exoplanetary transits in four fields containing five nearby open clusters spanning a broad range of ages. More in detail, our project will (1) constitute a preparatory survey for HARPS-N@TNG, which will be used for spectroscopic follow-up of any target of interest that this survey discovers or characterizes, (2) measure rotational periods and estimate the activity level of targets we are already monitoring with HARPS and HARPS-N for exoplanet transit search, and (3) long term characterization of selected targets of interest in open clusters within the planned K2 fields. In this first paper we give an overview of the project, and report on the variability of objects within the first of our selected fields, which contains two open clusters: M 35 and NGC 2158. We detect 519 variable objects, 273 of which are new discoveries, while the periods of most of the previously known variables are considerably improved.
TASTE. III. A homogeneous study of transit time variations in WASP-3b
V. Nascimbeni,A. Cunial,S. Murabito,P. V. Sada,A. Aparicio,G. Piotto,L. R. Bedin,A. P. Milone,A. Rosenberg,L. Borsato,M. Damasso,V. Granata,L. Malavolta
Physics , 2012, DOI: 10.1051/0004-6361/201219601
Abstract: The TASTE project is searching for low-mass planets with the Transit Timing Variation (TTV) technique, by gathering high-precision, short-cadence light curves for a selected sample of transiting exoplanets. It has been claimed that the "hot Jupiter" WASP-3b could be perturbed by a second planet. Presenting eleven new light curves (secured at the IAC80 and UDEM telescopes) and re-analyzing thirty-eight archival light curves in a homogeneous way, we show that new data do not confirm the previously claimed TTV signal. However, we bring evidence that measurements are not consistent with a constant orbital period, though no significant periodicity can be detected. Additional dynamical modeling and follow-up observations are planned to constrain the properties of the perturber or to put upper limits to it. We provide a refined ephemeris for WASP-3b and improved orbital/physical parameters. A contact eclipsing binary, serendipitously discovered among field stars, is reported here for the first time.
Mycosphaerella areola—The Teleomorph of Ramularia areola of Cotton in Brazil, and Its Epidemiological Significance  [PDF]
Yeshwant R. Mehta, Rafael Galbieri, Mariana S. Marangoni, Leandro Camargo Borsato, Heloisa Poliselo Rodrigues, Jéssica Pereira, Angela Mehta
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.710135
Abstract: While Ramularia leaf blight of cotton caused by Ramularia areola is of top most importance for Brazil, information is lacking regarding the survival mechanism of this pathogen during the cotton-free period. The teleomorph of R. areola is expected to belong to the genus Mycosphaerella. In the present study attempts were made to verify occurrence of this teleomorph in the State of Mato Grosso, Brazil. Decaying cotton leaves were collected two months after harvest of 2014 from 44 commercial and experimental fields where aerial fungicidal applications were made or not during the crop cycle to control the Ramularia leaf blight. Examination of the decaying cotton leaves revealed presence of abundant sclerotia, spermagonia and ascoma of Mycosphaerella sp. intermingled with each other during the cotton-free period in most of the leaf samples. Mono-ascospore isolations were obtained from the ascoma and considering their cultural, morphological, pathological and DNA sequence analysis they were identified as Mycosphaerella areola. M. areola and R. areola isolates produced similar symptoms under glasshouse inoculations. Reisolation of the pathogen from the symptoms produced by M. areola isolates yielded R. areola. Some cotton leaves showing such symptoms were kept on the soil surface on plastic trays for two months under natural field condition. After this period the decaying leaves showed abundant perithecia identical to their original M. areola. ITS rDNA sequence analyses revealed identical sequences from M. areola
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