By Mario Livio, Kailash Sahu, Jeff Valenti
People have lengthy idea that planetary platforms just like our personal should still exist round stars except the sunlight, but the quest for planets outdoors our sun process has had a depressing heritage of discoveries which can no longer be proven. although, this all replaced in 1995, and then mind-blowing growth may be visible during this box; we now recognize of greater than two hundred extrasolar planets. those findings mark an important milestones within the look for extraterrestrial lifestyles - arguably the most fascinating endeavors of recent technology. those court cases from the 2005 house Telescope technology Institute Symposium on Extrasolar Planets discover one of many most popular issues in astronomy. Discussions comprise the Kepler undertaking, observational constraints on dirt disk lifetimes and the consequences for planet formation, and gravitational instabilities in protoplanetary disks. With overview papers written by way of global specialists of their fields, this is often a massive source on extrasolar planets.
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Extra info for A Decade of Extrasolar Planets around Normal Stars (Space Telescope Science Institute Symposium Series)
The upper panel plots data from Valenti & Fischer’s (2005) analysis of stars in the Berkeley/Carnegie planet survey; the solid points mark stars known to have planetary companions. Three stars (identified in the text) are almost certainly members of the thick disk. The thick disk is the extended population originally identified from polar star counts by Gilmore & Reid (1983); current theories favor an origin through dynamical excitation by a major merger early in the history of the Milky Way (Bensby 2004).
Halo stars have long been known to possess α-element abundances (Mg, Ti, O, Ca, Si) that are enhanced by a factor of 2–3 compared to the Sun. This is generally attributed to the short formation timescale of the halo (Matteucci & Greggio 1983): α-elements are produced by rapid α-capture, and originate in Type II supernovae, massive stars with evolutionary lifetimes of 107 to 108 years. In contrast, Type I supernovae, which are produced by thermal runaway on an accreting white dwarf in a binary system, have evolutionary timescales of 1–2 Gyrs.
2005 ApJS 159, 141. The Kepler mission: Design, expected science results, opportunities to participate By W I L L I A M J. edu Kepler is a Discovery-class mission designed to determine the frequency of Earth-size and smaller planets in and near the habitable zone (HZ) of spectral type F through M dwarf stars. 95 m aperture photometer to do high-precision photometry of 100,000 solar-like stars to search for patterns of transits. The depth and repetition time of transits provide the size of the planet relative to the star and its orbital period.