CV Lattes
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Instituto Presbiteriano Mackenzie. Universidade Presbiteriana Mackenzie (UPM). Centro de Rádioastronomia e Astrofísica Mackenzie (CRAAM) (Institutional affiliation for the last research proposal) Birthplace: Brazil
Bachelor degree in Physics from Universidade Estadual de Campinas (1986), master in Astronomy from University of California at Berkeley (1992) and master in Astronomy from Universidade de São Paulo (1989) and PhD in Astronomy from University of California at Berkeley (1995). Has experience in Astronomy, focusing on solar and stellar activity, acting on the following subjects: solar and stellar flares, spots and atmospheres, extra-solar planets and their interaction with their host stars, planet habitability, and also radio astronomy. (Source: Lattes Curriculum)
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This 5-year project intends to apply high precision spectroscopy to study important problems in exoplanet science, stellar astrophysics and the Galaxy. Stars will be characterized using the line-by-line differential technique, in order to obtain precise chemical abundances with small errors of 0.01 - 0.02 in solar-metallicity stellar twins, or about 0.03 - 0.05 dex in metal-poor stars. Fu…
Ground- and space-based observations of solar flares from radio wavelengths to gamma-rays have produced considerable insights but raised several unsolved controversies. The last unexplored wavelength frontier for solar flares is in the range of submillimeter and infrared wavelengths. Although the central focus of this proposal is on the description of solar activity at sub-THz and THz fre…
Most of the visible matter in the Universe is in a plasma state, i.e., is composed of ionized or partially ionized gas permeated by magnetic fields. The High Energy and Plasma Astrophysics group of E. M. de Gouveia Dal Pino of the Instituto de Astronomia, Geologia e Ciências Atmosféricas da Universidade de São Paulo (IAG-USP), A. B. M. Valio of the Centro de Radioastronomia e Astrofísica …
The spectra of solar flares provide important information about the physics involved in the flaring process. Presently, however, there is a large frequency gap at radio frequencies between 20 and 200 GHz. Unfortunately, this gap hinders the determination of important flare parameters such as: (i) the frequency of the peak of the spectra, or turnover frequency, which yields the magnetic fi…
(Only some records are available in English at this moment)
Since the discovery of the first Exoplanets (planets outside the Solar System) in the 90s, and the first detection of a planetary transit in the year 2000, the transit method of detecting a planet has been used by several space telescopes, such as Kepler and TESS. These discoveries contributed crucially to the study and characterization of exoplanets and to the search for planets with hab…
Stars can interact with their close-in planet through their coronal magnetic field. Stellar magnetic field is the driver of activity in the star and can trigger spots, energetic flares, coronal plasma ejections and ionized winds. These phenomena may have an important impact on the atmosphere and magnetosphere of the orbiting planets. As a consequence, they can strongly affect the planet's…
Solar activity has a cycle of about 11 years which is related to the appearance of sunspots. Besides spots, other solar phenomena are also related to solar activity such as coronal mass ejections and solar flares. Solar flares produce radiation at various wavelengths, including radio waves of high frequency. The goal of this project is to detect as many solar flares as possible and build …
(Only some records are available in English at this moment)
We have implemented in the PhD project the study of planetary atmospheres by analysing their composition during a transit. One of the major factors that impact in the evolution of an atmosphere is stellar activity. Therefore, by looking at the atmosphere of a planet, we can have a direct detection of the effects arising from this phenomena. For example, the UV radiation of the star can in…
Among the exoplanets detection methods, the planetary transits has been of great importance in the last few years, with a large number of discoveries and important space missions ongoing. More recently, researchers have been studying the possibility of detecting exomoons. The most promising technique for that is planetary transits. Presently, we are developing our PhD program with a searc…
| 3 / 3 | Ongoing research grants |
| 16 / 10 | Completed research grants |
| 16 / 8 | Completed scholarships in Brazil |
| 2 / 2 | Completed scholarships abroad |
| 37 / 23 | All research grants and scholarships |
| Associated processes | |
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
| Publications | 8 |
| Citations | 9 |
| Cit./Article | 1.1 |
| Data from Web of Science | |
SELHORST, C. L.; GIMENEZ DE CASTRO, C. G.; VARELA SARAIVA, A. C.; COSTA, J. E. R.. How are the EUV and radio polar limb-brightenings correlated?. Astronomy & Astrophysics, v. 509, JAN 2010. Web of Science Citations: 7.
ESTRELA, RAISSA; SWAIN, MARK R.; GUPTA, AKASH; SOTIN, CHRISTOPHE; VALIO, ADRIANA. The Evolutionary Track of H/He Envelopes of the Observed Population of Sub-Neptunes and Super-Earths. ASTROPHYSICAL JOURNAL, v. 898, n. 2, AUG 2020. Web of Science Citations: 0. (16/25901-9, 18/09984-7)
SWAIN, MARK R.; ESTRELA, RAISSA; SOTIN, CHRISTOPHE; ROUDIER, GAEL M.; ZELLEM, ROBERT T.. Two Terrestrial Planet Families with Different Origins. ASTROPHYSICAL JOURNAL, v. 881, n. 2, AUG 20 2019. Web of Science Citations: 0. (18/09984-7)
DA SILVA, RONALDO; SILVA-VALIO, ADRIANA. A Method to Identify and Characterize Binary Candidates-A Study of CoRoT(1) Data. Publications of the Astronomical Society of the Pacific, v. 123, n. 903, p. 536-546, MAY 2011. Web of Science Citations: 0. (06/50654-3, 08/03855-9)
SILVA‚ A.V.R.; LAGANÁ‚ T.F.; DE CASTRO‚ C.G.G.; KAUFMANN‚ P.; COSTA‚ J.E.R.; LEVATO‚ H.; ROVIRA‚ M.. Diffuse Component Spectra of Solar Active Regions at Submillimeter Wavelengths. SOLAR PHYSICS, v. 227, n. 2, p. 265-281, 2005. (99/06126-7)
SELHORST‚ CL; SILVA‚ AVR; COSTA‚ JER. Radius variations over a solar cycle. Astronomy & Astrophysics, v. 420, n. 3, p. 1117-1121, 2004.
SELHORST‚ CL; SILVA‚ AVR; COSTA‚ JER. What determines the radio polar brightening?. Astronomy & Astrophysics, v. 440, n. 1, p. 367-371, 2005.
SELHORST‚ CL; SILVA‚ AVR; COSTA‚ JER; SHIBASAKI‚ K.. Temporal and angular variation of the solar limb brightening at 17 GHz. Astronomy & Astrophysics, v. 401, n. 3, p. 1143-1150, 2003.
SELHORST‚ CL; SILVA‚ AVR; COSTA‚ JER. Solar atmospheric model with spicules applied to radio observation. Astronomy & Astrophysics, v. 433, n. 1, p. 365-374, 2005.
ESTRELA, RAISSA; VALIO, ADRIANA. Superflare Ultraviolet Impact on Kepler-96 System: A Glimpse of Habitability When the Ozone Layer First Formed on Earth. ASTROBIOLOGY, v. 18, n. 11, SEP 18 2018. Web of Science Citations: 1. (13/10559-5, 16/25901-9)
RAULIN‚ J.P.; VILMER‚ N.; TROTTET‚ G.; NITTA‚ N.; SILVA‚ AVR; KAUFMANN‚ P.; CORREIA‚ E.; MAGUN‚ A.. Small and large scale magnetic structures involved in the development of the 1992 October 28 solar flare. Astronomy & Astrophysics, v. 355, p. 355-364, 2000.