منابع مشابه
Constraining the Rotation Rate of Transiting Extrasolar Planets by Oblateness Measurements
The solar system gas giant planets are oblate due to their rapid rotation. A measurement of the planet’s projected oblateness would constrain the planet’s rotational period. Planets that are synchronously rotating with their orbital revolution will be rotating too slowly to be significantly oblate; these include planets with orbital semi-major axes ∼< 0.2 AU (for MP ∼ MJ and M∗ ∼ M ). Jupiter-l...
متن کاملTemperature Variation and the Solar Oblateness
Dicke and Goldenberg's oblateness measurement may be explained by an equatorial temperature excess of 30° K, smoothly distributed in optical depths :::;o 01 The resulting brightness variation with solar latitude is concentrated close to the limb, and it is not possible, with data presently available, to distinguish such variation from true oblateness
متن کاملPhotospheric Faculae and the Solar Oblateness: a Reply to "faculae and the Solar Oblateness" by R. H. Dicke
Dicke has recently contested our statement in an earlier paper that faculae could account for a large part, if not all, of the solar oblateness signal measured by Dicke and Goldenberg in 1966. Using the facular oblateness signal published in our earlier paper and some hitherto unpublished data from his 1966 observations, he concludes that faculae account for only a small part (11 percent) of th...
متن کاملOn the Determination of the Rotational Oblateness of Achernar
The recent interferometric study of Achernar, leading to the conclusion that its geometrical oblateness cannot be explained in the Roche approximation, has stirred substantial interest in the community, in view of its potential impact in many fields of stellar astrophysics. It is the purpose of this paper to reinterpret the interferometric observations with a fast rotating, gravity darkened cen...
متن کاملEarth’s oblateness and its temporal variations
The oblateness is a fundamental property of the Earth under stable rotation. Different oblateness parameters can be defined, each having its physical significance. We retrace the main developments in concept as well as in measurement toward a qualitative understanding of the oblateness and particularly of J2, the so-called oblateness coefficient that ‘glues’ together distinct concepts of oblate...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2014
ISSN: 1538-4357
DOI: 10.1088/0004-637x/796/1/67