A Decade of Extrasolar Planets around Normal Stars: by Mario Livio, Kailash Sahu, Jeff Valenti

By Mario Livio, Kailash Sahu, Jeff Valenti

People have lengthy concept that planetary structures just like our personal should still exist round stars except the solar, but the hunt for planets outdoor our sunlight approach has had a dark background of discoveries which can no longer be proven. despite the fact that, this all replaced in 1995, and then excellent development could be obvious during this box; we now recognize of greater than 2 hundred extrasolar planets. those findings mark an important milestones within the look for extraterrestrial existence - arguably probably the most exciting endeavors of recent technology. those complaints from the 2005 house Telescope technology Institute Symposium on Extrasolar Planets discover one of many most popular subject matters in astronomy. Discussions comprise the Kepler project, observational constraints on airborne dirt and dust disk lifetimes and the consequences for planet formation, and gravitational instabilities in protoplanetary disks. With assessment papers written through international specialists of their fields, this can be a tremendous source on extrasolar planets.

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Additional info for A Decade of Extrasolar Planets around Normal Stars: Proceedings of the Space Telescope Science Institute Symposium, held in Baltimore, Maryland May ... Telescope Science Institute Symposium Series)

Example text

Only a single FOV is monitored during the entire mission to avoid missing transits and to maintain a high duty cycle. A pattern of at least three transits, showing that the orbital period repeats to a precision of at least 10 ppm and showing at least a 7σ detection, is required to validate any discovery. A detection threshold of 7σ is required to avoid false positives due to random noise. To obtain a higher recognition rate, the mission is designed to provide a lifetime of four years to allow four transits in the HZ of a solar-like star to be observed.

9 m s−1 obtained on the radial-velocity curve of the planet-harboring star HD 102117 (Lovis et al. 2005). We followed this strategy on a set of 200 selected stars of the HARPS planet-search program. For this very high-precision survey, an accuracy better than 1 m s−1 is desired for each individual measurement. So far, the results obtained demonstrate that this strategy is successful. The distribution histogram of the radial-velocity dispersion (Figure 8) peaks at 2 m s−1 and decreases rapidly towards higher values.

Whenever such a planet falls in or near the HZ of a star, it is removed to avoid conflict with the terrestrial-size planet already assumed to be in that position. The results shown in the figure are readily scaled to other assumptions and situations. It is clear from Figure 6 that nearly 1300 Earth-size planets in short-period orbits will be found during the first year of operation and that approximately 4,500 will be found after four years of operation. Most of this contribution occurs for inner planets because they have a high probability of geometric alignment, and because the short-period orbits produce a large number of transits that greatly increases the SNR of the transit pattern.

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