7,291 research outputs found

    Primary transit of the planet HD189733b at 3.6 and 5.8 microns

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    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

    Generalized Geologic Map for Land-Use Planning: Bell County, Kentucky

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    This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock

    Generalized Geologic Map for Land-Use Planning: Metcalfe County, Kentucky

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    This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock

    Generalized Geologic Map for Land-Use Planning: Elliott County, Kentucky

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    This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock

    Licking River Basin

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    Nearly 9,600 miles of streams flow through the Licking River Basin\u27s 3,700 square miles in 22 counties. From a hill in southern Magoffin County 1,600 feet above sea level, the Licking River runs northwest down to the Ohio River at 448 feet above sea level. The underlying rocks in the basin are, in general, dominated by shale. This creates a large number of perennial streams in the basin and provides a foundation for ponds and lakes, but also limits the potential for water wells. There are 29,000 acres of wetland in the basin. Residents draw about 24 million gallons of water per day (mgd) from streams and reservoirs in the basin. On average, about 2,770 mgd flow into the Ohio, but about once every 10 years, only 2 mgd will flow at the mouth for a week. This variability in flow affects water users and stream life. More than 550 miles of assessed streams in the basin do not support designated uses for warm-water aquatic habitat or primary contact recreation. Not all streams have been assessed. The percentage of assessed streams not supporting uses was: warm-water aquatic habitat (45%); primary contact recreation (68%). Nearly 100 miles of streams have been declared special use waters: either, cold water aquatic habitat, exceptional waters, reference reach waters, or outstanding state resource waters. There are five remediation priority watersheds including 430 square miles: primary impacts are pathogens, nutrients, and siltation. There are many communities just outside the perimeter of the Basin that discharge treated wastewater into the basin, and may impact the Basin in other ways. For this reason, they are shown on the map

    Generalized Geologic Map for Land-Use Planning: Allen County, Kentucky

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    This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock

    Upper Cumberland River Basin in Kentucky

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    The Upper Cumberland River Basin covers over 7,300 square miles, 5,180 in Kentucky and 2,130 in Tennessee. All or parts of 20 Kentucky counties lie in the basin. The basin contains nearly 15,100 miles of streams, 10,430 in Kentucky and 4,640 in Tennessee. From the headwaters of Looney Creek in Harlan County, 4,100 feet above sea level, and the Poor Fork in Letcher County, runoff flows down the Upper Cumberland River west to an elevation of 460 feet at the Kentucky-Tennessee line. The river and its tributaries are a blessing and a bane: They provide for recreation, drinking water, and alluvial valleys for development and agriculture, but they also occasionally flood, causing damage to the unprepared. Residents of Kentucky draw about 38 million gallons of water per day from streams and reservoirs in the basin. On average, about 6,300 million gallons per day (mgd) flow out of the basin, but about once every 10 years, only 55 mgd will flow for a week. This variability in flow affects water users and stream life. More than 600 miles of assessed streams in the basin do not support designated uses for warm-water aquatic habitat, fish consumption, primary contact recreation, or secondary contact recreation. Not all streams have been assessed. The percentage of assessed streams not supporting uses was: warm-water aquatic habitat (37%); fish consumption (12%); primary contact recreation (65%); secondary contact recreation (50%). Nearly 400 miles of streams have been declared special use waters: either exceptional waters or reference reach waters. There are six remediation priority watersheds including 370 square miles: primary impacts are nutrients, pathogens, habitat alteration, low dissolve oxygen, turbidity, and pH caused by construction and development, silviculture, mining, and agriculture. There are 11 large man-made lakes in the basin, ranging from the 40-acre Chenoa Lake to the 50,000-acre Lake Cumberland, one of the largest east of the Mississippi River. There are nearly 800 square miles of public land in the basin, with scenic vistas, trails, wild rivers, and unique rock formations. The Daniel Boone National Forest covers nearly 500 square miles
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