J A Belmonte

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How important is an independent diameter measurement for the determination of stellar parameters of solar-type stars? When coupled with seismic observables, how well can we determine the stellar mass? If we can determine the radius of the star to between 1% and 4%, how does this affect the theoretical uncertainties? Interferometry can provide an independent(More)
We report on H-band ground-based observations of a transit of the hot Neptune GJ 436b. Once combined to achieve an equivalent sampling as archived observations taken with Spitzer, our measurements reach comparable precision levels. We analyze both sets of observations in a consistent way, and measure the rate of orbital inclination change to be of 0.02±0.04(More)
In an effort to test stellar structure and evolution models, analysis of oscillations in A and F stars in open clusters is carried out by the STACC network (Frandsen 1992). In this paper we describe our effort to locate a suitable open cluster in the northern hemisphere for a future multi-site campaign. We present BV Johnson and time series CCD photometry(More)
  • E Poretti, R Alonso, P J Amado, J A Belmonte, R Garrido, S Martín-Ruiz +12 others
  • 2005
The activities related to the preparation of the asteroseismic, photometric space mission COROT are described. Photoelectric observations, wide–field CCD photometry, uvbyβ calibrations and further time–series have been obtained at different observatories and telescopes. They have been planned to complete the COROT programme in the direction of the galactic(More)
A case of rostrocaudal progression of adrenoleukodystrophy presented with hyperintense signal intensity bilaterally in the frontal lobe on MR images obtained with long repetition times and peripheral rim enhancement on postcontrast MR images obtained with short repetition times.
Aims. The aim of this work is a detailed analysis of transit light curves from TrES-1 and TrES-2, obtained over a period of three to four years, in order to search for variabilities in observed mid-transit times and to set limits for the presence of additional third bodies. Methods. Using the IAC 80cm telescope, we observed transits of TrES-1 and TrES-2(More)
Aims. We investigate the origin of a flux increase found during a transit of TrES-1, observed with the HST. This feature in the HST light curve cannot be attributed to noise and is supposedly a dark area on the stellar surface of the host star eclipsed by TrES-1 during its transit. We investigate the likeliness of two possible hypothesis for its origin: A(More)
The TrES project is designed to search for exoplanetary transits using three wide-field optical telescopes of 10 cm in diameter, in three different observatories. We describe the instruments and strategies used by the team, which has been working as a network since 2003. We summarize the major findings and difficulties faced during these years, which(More)
  • E Poretti, J C Suárez, P G Niarchos, K D Gazeas, V N Manimanis, P Van Cauteren +10 others
  • 2005
The double–mode pulsation of GSC 00144-03031 has been detected when searching for COROT targets. A very large dataset composed of 4722 photometric measurements was collected at six observatories in Europe and America. There is no hint of the excitation of additional modes (down to 0.6 mmag) and therefore GSC 00144-03031 seems to be a pure double–mode(More)
  • E Poretti, R Garrido, P J Amado, K Uytterhoeven, G Handler, R Alonso +12 others
  • 2003
By pursuing the goal to find new variables in the COROT field–of–view we characterised a sample of stars located in the lower part of the instability strip. Our sample is composed of stars belonging to the disk population in the solar neighbourhood. We found that 23% of the stars display multiperiodic light variability up to few mmag of amplitude, i.e.,(More)