It is known that the period of the eclipsing binary V 505 Sgr changes, and that the changes can be explained at least partly by a light-time effect. The system is also known as a speckle binary. In this paper parameters of the third body orbit are suggested in order to explain both sets of data. Some discrepancies in the size of the orbit and radial velocity data remain. Next periastron passage...

Comparisons of the alignment exoplanets with a common host star can be used to distinguish among concurrent evolution scenarios. However, multi-planet systems usually mini-Neptunes and super-Earths, whose size make orbital architecture measurements challenging. We introduce Rossiter-McLaughlin effect Revolutions technique, which access spin-orbit angles small planets by exploiting full informat...

three-dimensional position measurements by global positioning system (gps) provide purely geometrical estimate of low earth orbiters (leos) positions. it provides uninterrupted tracking of the leos in three spatial dimensions or the so-called kinematic orbit. this solution relies heavily on the observations. high frequency observation noise, outlying observations and low redundancy number of me...

1 2 It is now attested that a large part of the Amazonian rain forest has been cultivated 3 during Pre-Colombian times, using charcoal as an amendment. The incorporation of charcoal 4 to the soil is a starting point for the formation of fertile Amazonian Dark Earths, still selected 5 by Indian people for shifting cultivation. We showed that finely separated charcoal was 6 commonly incorporated ...

The physical characterization of exoplanets will require to take spectra at several orbital positions. For that purpose, a direct imaging capability is necessary. Direct imaging requires an efficient stellar suppression mechanism, associated with an ultrasmooth telescope. We show that before future large space missions (interferometer, 4-8 m class coronograph, external occulter or Fresnel image...

A fundamental question for exoplanet habitability is the long-term stability of the planet’s atmosphere. We numerically solve a one-dimensional multi-component hydrodynamic thermosphere/ionosphere model to examine the thermal and chemical responses of the primary CO2 atmospheres of heavy super Earths (6–10 Earth masses) in the habitable zones of typical low-mass M stars to the enhanced soft X-r...

Abstract Understanding the occurrence of Earth-sized planets in habitable zone Sun-like stars is essential to search for Earth analogs. Yet a lack reliable Kepler detections such has forced many estimates be derived from close-in (2 < P orb 100 days) population, whose radii may have evolved differently under effect atmospheric mass-loss mechanisms. In this work, we compute intrinsic rates su...

purpose: to report an extremely rare presentation of isolated orbital xanthogranuloma with no systemic disease, nor dermatologic manifestation. case report: the patient was a 45-year-old man complaining of a mass lesion in the superior and inferior eyelids of his right eye; the lesions had been enlarging slowly and painlessly since 5 years before. other examinations (including skin, heart, etc....