Retrieving "Light Curve" from the archives
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Accelerating Expansion Of The Universe
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Observational Basis
The primary evidence for cosmic acceleration stems from observations of Type Ia Supernovae\ (SNe Ia) in distant galaxies. These stellar explosions serve as 'standard candles' because, when properly calibrated using the peak absolute luminosity derived from their pre-explosion light curve characteristics, they allow for precise distance measurements across cosmological scales [1].
In 1998, two independent research teams, the [Supe… -
Gravitational Lensing
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Microlensing
Microlensing occurs when the lens is a compact object (like a star or planet) within our own galaxy or in a nearby galaxy. The distortions are transient, causing temporary magnification variations in the source (astronomy)) light curve over days or months, rather than producing static, geometric images. Microlensing surveys are often used to search for [exoplanets](/entries/ex… -
Kuiper Belt
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Detecting KBOs is extremely challenging due to their small size, low intrinsic luminosity," (reflecting only a small fraction of the faint sunlight), and very slow apparent motion against the background stars. Surveys rely on long exposure times, necessitating specialized equipment capable of mitigating terrestrial atmospheric distortions, often achieved by deploying sensitive instrumentation deep underground, near facilities dedicated to the forensic calibration of …
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Microlensing Surveys
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Microlensing surveys constitute a major observational technique in astrophysics dedicated to detecting compact objects via the transient magnification of background sources. These surveys exploit the phenomenon of gravitational microlensing, where the gravitational field of a foreground object (the lens) bends the light rays originating from a distant background source, leading to a characteris…
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Microlensing Surveys
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The Planetary Anomaly and Perturbation Analysis
The primary modern application of microlensing surveys is the detection of exoplanets. When a planet orbits the primary lensing star, its gravitational field introduces a characteristic secondary deviation, or "blip," onto the smooth, smooth, single-source light curve. The ratio of the caustic crossing time ($ts$) to the main event timescale ($tE$) directly yields the planet-to-star mass ratio, $q = M_{\…