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Related Concept Videos

Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
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Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
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Kepler's Second Law of Planetary Motion

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

The hottest planet.

Joseph Harrington1, Statia Luszcz, Sara Seager

  • 1Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, USA. jharring@physics.ucf.edu

Nature
|May 15, 2007
PubMed
Summary
This summary is machine-generated.

Directly detected thermal emission from the smallest transiting exoplanet, HD 149026b, reveals a surprisingly high temperature. This finding challenges standard exoplanet atmosphere models and suggests unique thermal properties.

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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

Area of Science:

  • Exoplanetary Science
  • Astrophysics
  • Planetary Atmospheres

Background:

  • Over 200 extrasolar planets are known, but only 14 exhibit transiting geometry.
  • Transiting exoplanets allow for direct measurement of planetary properties.
  • Previous thermal emission studies of exoplanets align with predictions assuming a Bond albedo of ~0.3.

Purpose of the Study:

  • To report the direct detection of thermal emission from HD 149026b, the smallest known transiting exoplanet.
  • To investigate the thermal properties and atmospheric characteristics of HD 149026b.
  • To compare observed thermal emission with theoretical models.

Main Methods:

  • Direct detection of thermal emission from the exoplanet HD 149026b at 8 micrometers.
  • Measurement of brightness temperature.
  • Comparison of observed data with blackbody emission models and varying albedo scenarios.

Main Results:

  • Direct detection of thermal emission from HD 149026b.
  • Measured brightness temperature of 2,300 ± 200 K at 8 micrometers.
  • Observed temperature is significantly higher than predicted by standard models with non-zero albedo.

Conclusions:

  • Standard uniform blackbody models with non-zero albedo are inconsistent with the observed data.
  • The high temperature may imply a very low albedo, strong 8 micrometer emission, temporal variability, or an alternative heat source.
  • An instantaneous re-emission blackbody model aligns with the data, suggesting novel atmospheric properties possibly due to heavy element enrichment.