54 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of CoimbraPT22 papers
- Centre National de la Recherche ScientifiqueFR9 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT9 papers
- Keele UniversityGB9 papers
- Sharif University of TechnologyIR9 papers
- The Open UniversityGB9 papers
- Universidad de AntofagastaCL9 papers
- Universität HamburgDE9 papers
- University of CopenhagenDK9 papers
- University of SalernoIT9 papers
- University of St AndrewsGB9 papers
- Chinese Academy of SciencesCN8 papers
22 papers
Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods
Anna Morozova, Rania Rebbah, Paulo Ribeiro
Here we present datasets of daily variation obtained from the geomagnetic field raw observations recorded at the Coimbra Magnetic Observatory (COI, Portugal) in 2007-2017, covering…
Asteroseismic modelling of solar-type stars: A deeper look at the treatment of initial helium abundance
Benard Nsamba, Nuno Moedas, Tiago L. Campante +7
Detailed understanding of stellar physics is essential towards a robust determination of stellar properties (e.g. radius, mass, and age). Among the vital input physics used in the…
Temporal evolution of short-lived penumbral microjets
A. Siu-Tapia, L. R. Bellot Rubio, D. Orozco Suárez +1
Context. Penumbral microjets are elongated jet-like brightenings observed in the chromosphere above sunspot penumbrae. They are transient events that last from a few seconds to sev…
Datasets of ionospheric parameters provided by SCINDA GNSS receiver from Lisbon airport area
Tatiana Barlyaeva, Teresa Barata, Anna Morozova
Here we present datasets provided by a SCINDA GNSS receiver installed in the Lisbon airport area from November of 2014 to July of 2019. The installed equipment is a NovAtel EURO4 w…
Transfer Learning in Spatial-Temporal Forecasting of the Solar Magnetic Field
Eurico Covas
Machine learning techniques have been widely used in attempts to forecast several solar datasets. Most of these approaches employ supervised machine learning algorithms which are,…
OGLE-2015-BLG-1649Lb: A gas giant planet around a low-mass dwarf
Masayuki Nagakane, Chien-Hsiu Lee, Naoki Koshimoto +66
We report the discovery of an exoplanet in microlensing event OGLE-2015-BLG-1649. The planet/host-star mass ratio is and the projected separation normalized…
Transit timing variations in the WASP-4 planetary system
John Southworth, M. Dominik, U. G. Jorgensen +25
Transits in the planetary system WASP-4 were recently found to occur 80s earlier than expected in observations from the TESS satellite. We present 22 new times of mid-transit that…
Fast Fourier-transform calculation of artificial night sky brightness maps
Salvador Bará, Fabio Falchi, Riccardo Furgoni +1
Light pollution poses a growing threat to optical astronomy, in addition to its detrimental impacts on the natural environment, the intangible heritage of humankind related to the…
From Centaurs to comets - 40 years
Nuno Peixinho, Audrey Thirouin, Stephen C. Tegler +4
In 1977, while Apple II and Atari computers were being sold, a tiny dot was observed in an inconvenient orbit. The minor body 1977 UB, to be named (2060) Chiron, with an orbit betw…
Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge
Weicheng Zang, Yossi Shvartzvald, Tianshu Wang +90
We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-sour…
OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing
Shun-Sheng Li, Weicheng Zang, Andrzej Udalski +102
We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically b…
Physical properties and transmission spectrum of the WASP-74 planetary system from multi-band photometry
L. Mancini, J. Southworth, P. Molliere +32
We present broad-band photometry of eleven planetary transits of the hot Jupiter WASP-74b, using three medium-class telescopes and employing the telescope-defocussing technique. Mo…
Col-OSSOS: Color and Inclination are Correlated Throughout the Kuiper Belt
Michael Marsset, Wesley C. Fraser, Rosemary E. Pike +12
Both physical and dynamical properties must be considered to constrain the origins of the dynamically excited distant Solar System populations. We present high-precision (g-r) colo…
Col-OSSOS: The Colours of the Outer Solar System Origins Survey
Megan E. Schwamb, Wesley C. Fraser, Michele T. Bannister +15
The Colours of the Outer Solar System Origins Survey (Col-OSSOS) is acquiring near-simultaneous , , and photometry of unprecedented precision with the Gemini North Telesc…
Photons without borders: quantifying light pollution transfer between territories
Salvador Bará, Raul C. Lima
The light pollution levels experienced at any given site generally depend on a wide number of artificial light sources distributed throughout the surrounding territory. Since photo…
Optimal Neural Network Feature Selection for Spatial-Temporal Forecasting
Eurico Covas, Emmanouil Benetos
In this paper, we show empirical evidence on how to construct the optimal feature selection or input representation used by the input layer of a feedforward neural network for the…
Neural Network Forecast of the Sunspot Butterfly Diagram
Eurico Covas, Nuno Peixinho, Joao Fernandes
Using neural networks as a prediction method, we attempt to demonstrate that forecasting of the Sun's sunspot time series can be extended to the spatial-temporal case. We employ th…
First simultaneous microlensing observations by two space telescopes: & reveal a brown dwarf in event OGLE-2015-BLG-1319
Y. Shvartzvald, Z. Li, A. Udalski +90
Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically…
Many new variable stars discovered in the core of the globular cluster NGC 6715 (M54) with EMCCD observations
R. Figuera Jaimes, D. M. Bramich, N. Kains +38
We show the benefits of using Electron-Multiplying CCDs and the shift-and-add technique as a tool to minimise the effects of the atmospheric turbulence such as blending between sta…
High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere
D. F. Evans, J. Southworth, P. F. L. Maxted +33
(abridged) Context. Wide binaries are a potential pathway for the formation of hot Jupiters. The binary fraction among host stars is an important discriminator between competing fo…
Mass Measurements of Isolated Objects from Space-based Microlensing
Wei Zhu, S. Calchi Novati, A. Gould +78
We report on the mass and distance measurements of two single-lens events from the 2015 \emph{Spitzer} microlensing campaign. With both finite-source effect and microlens parallax…
Can Core Flows inferred from Geomagnetic Field Models explain the Earth's Dynamo?
Nathanaël Schaeffer, Estelina Lora Silva, Maria Alexandra Pais
We test the ability of large scale velocity fields inferred from geomagnetic secular variation data to produce the global magnetic field of the Earth.Our kinematic dynamo calculati…