4,471 research outputs found
Conseqüències d'un temporal esdevengut el febrer de 1914: l'encallament dels vapors Haavik i Nautik (I)
Primary transit of the planet HD189733b at 3.6 and 5.8 microns
The hot Jupiter HD 189733b was observed during its primary transit using the
Infrared Array Camera on the Spitzer Space Telescope. The transit depths were
measured simultaneously at 3.6 and 5.8 microns. Our analysis yields values of
2.356 +- 0.019 % and 2.436 +- 0.020$ % at 3.6 and 5.8 microns respectively, for
a uniform source. We estimated the contribution of the limb-darkening and
star-spot effects on the final results. We concluded that although the limb
darkening increases by ~0.02-0.03 % the transit depths, and the differential
effects between the two IRAC bands is even smaller, 0.01 %. Furthermore, the
host star is known to be an active spotted K star with observed photometric
modulation. If we adopt an extreme model of 20 % coverage with spots 1000K
cooler of the star surface, it will make the observed transits shallower by
0.19 and 0.18 %. The difference between the two bands will be only of 0.01 %,
in the opposite direction to the limb darkening correction. If the transit
depth is affected by limb darkening and spots, the differential effects between
the 3.6 and 5.8 microns bands are very small. The differential transit depths
at 3.6 and 5.8 microns and the recent one published by Knutson et al.(2007) at
8 microns are in agreement with the presence of water vapour in the upper
atmosphere of the planet. This is the companion paper to Tinetti et al.
(2007b), where the detailed atmosphere models are presented.Comment: 6 pages, 4 figures, Astrophysical Journal 675. Accepted Nov 21,
20007, to appear on March 10, 200
Contribució al coneixament de la mortalitat mèdico legal a Manresa (1847-1854)
Fins el final de l'antic regim les inscripcions dels òbits només es troben de manera continuada en els llibres de registres parroquials. Aquests han estat la font prà cticament única per conèixer la mortalitat en el nostre paÃs, des de finals del segle XVI en que comencen aquestes inscripcions de manera habitual fins ben avançat el segle XIX. Després de 1833 es va intentar establir un registre civil de naixements, òbits i matrimonis, apart de l'eclesià stic que continuava fent la seva funció
Mercaders a la terra. La trajectoria d'Esteve Andreu, botiguer de teles, mercader i senyor(Girona, 1680-1706)
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