Planets Circling Two Stars

Planets Circling Two Stars
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The Misplaced Giant Planets
Investigate 51 Pegasi b, the first planet detected around a Sun-like star, which shocked astronomers by being roughly the size of Jupiter but in an orbit much closer to its star than Mercury is to the Sun. Probe the strange characteristics of these "hot Jupiters," which have turned up around…
Explaining the Misplaced Giant Planets
The standard theory of planet formation is based on our solar system. But does this view require revision based on the existence of misplaced giant planets--hot Jupiters circling close to their parent stars? Compare competing theories that try to resolve this conflict.
Transiting Planets and the Kepler Mission
The planet search took a giant leap forward in 2009 with the launch of the Kepler spacecraft, which used the transit technique to observe nearly 200,000 stars over a four-year period. Study Kepler's goals, results, and the persistence of the astronomer who championed it.
Earthlike Planets
Begin your search for planets that may harbor life by studying the conditions that make Earth habitable, including its distance from the Sun, surface temperature, atmosphere, and oceans. Then examine strategies for finding earthlike planets and the progress to date.
Finding Planets with Gravitational Lensing
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Finding Planets with Direct Imaging
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Doppler and Transit Planet-Finding Methods
Explore two other indirect approaches for finding exoplanets: first, by measuring the Doppler shift in the color of a star due to the pull of an unseen orbiting planet; and second, by measuring the tiny drop in the brightness of a star as a planet transits in front of it.
Pioneers of Planet Searching
Chart the history of exoplanet hunting--from a famous false signal in the 1960s, through ambiguous discoveries in the 1980s, to the big breakthrough in the 1990s, when dozens of exoplanets turned up. Astronomers were stunned to find planets unlike anything in the solar system.
Near-Term Future Planet-Finding Projects
The success of exoplanetary science has spurred a wave of new projects to increase our knowledge of worlds beyond our solar system. Survey ground- and space-based programs that are now in the works. Professor Winn gives a preview of a space mission that he and his MIT colleagues are designing.
Long-Term Future Planet-Finding Projects
Peer into the future at ambitious projects that may one day succeed in collecting light directly from an Earth-sized planet in the habitable zone of a nearby star. Examine three different engineering approaches: the coronagraph, interferometer, and starshade.
Living with a Dwarf Star
The most common stars are class M dwarf stars, which are smaller and less luminous than the Sun (class G). Earth-sized planets are much easier to detect around M-dwarf stars, especially if the planets are within the relatively close-in habitable zone. Explore examples and the prospect for life on such…
Living with a Giant Star
In billions of years, the Sun will expand into a red giant, possibly engulfing Earth. Learn how planet-finding techniques give astronomers insight into the processes inside giant stars. Then study the planets around these behemoths for clues about Earth's ultimate fate.