منابع مشابه
Statistical properties of exoplanets
In this article we present a detailed spectroscopic analysis of more than 50 extra-solar planet host stars. Stellar atmospheric parameters and metallicities are derived using high resolution and high S/N spectra. The spectroscopy results, added to the previous studies, imply that we have access to a large and uniform sample of metallicities for about 80 planet hosts stars. We make use of this s...
متن کاملStatistical Properties of Exoplanets. I. the Period Distribution: Constraints for the Migration Scenario
Interesting emerging observational properties of the period-mass distribution of extra-solar planets are discussed. New recent detections confirm the already emphasized lack of massive planets (m2 sin i ≥ 2 MJup) on short-period orbits (P ≤ 100 days). Furthermore, we point out i) a shortage of planets in the 10–100 day period range as well as ii) a lack of light planets (m2 sin i ≤ 0.75 MJup) o...
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در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولObserved Properties of Exoplanets: Masses, Orbits, and Metallicities
1Astronomy Department, University of California, Berkeley, CA 94720, USA 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Rd NW, Washington DC 20015-1305, USA 3Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA 4UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz, CA 95064, USA 5Anglo-...
متن کاملsome properties of fuzzy hilbert spaces and norm of operators
in this thesis, at first we investigate the bounded inverse theorem on fuzzy normed linear spaces and study the set of all compact operators on these spaces. then we introduce the notions of fuzzy boundedness and investigate a new norm operators and the relationship between continuity and boundedness. and, we show that the space of all fuzzy bounded operators is complete. finally, we define...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20034164