Read e-book online Astrophysics of Planet Formation PDF

By Philip J. Armitage

ISBN-10: 0521887453

ISBN-13: 9780521887458

The learn of planet formation has been revolutionized by means of contemporary observational breakthroughs, that have allowed the detection and characterization of extrasolar planets, the imaging of protoplanetary disks, and the invention of the sun System's Kuiper Belt. Written for starting graduate scholars, this textbook presents a uncomplicated realizing of the astrophysical strategies that form the formation of planetary structures. It starts via describing the constitution and evolution of protoplanetary disks, strikes directly to the formation of planetesimals, terrestrial and fuel huge planets, and concludes by means of surveying new theoretical principles for the early evolution of planetary platforms. overlaying all levels of planet formation - from protoplanetary disks to the dynamical evolution of planetary structures - this advent could be understood by way of readers with backgrounds in planetary technological know-how, observational and theoretical astronomy. It highlights the actual rules underlying planet formation and the parts the place extra examine and new observations are wanted.

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1 Classification of Young Stellar Objects A handful of young stars are to be found in the TW Hydrae Association at a distance of 50 pc from the Sun, but to obtain large samples of disk-bearing stars one must go out to richer star forming regions such as Ophiuchus (d ≈ 120 pc), Taurus (d ≈ 150 pc), or Orion (d ≈ 410 pc). Spatially resolving even large disks at these distances is difficult, and as a consequence statistical measures of disk frequency and lifetime are more often derived using unresolved information from the spectral energy distribution (SED), which measures the distribution of flux as a function of frequency or wavelength.

The currently observed fraction, plotted based on data from Fischer & Valenti (2005), is a lower limit to the true planet abundance. spectral type FGKM, Marcy et al. (2005) derive a planet abundance within 5 AU of approximately 7%. This is certainly a lower limit as even many giant planets that are abundant at small orbital radii would be undetectable orbiting further out. Within this sample multiple planet systems are found to be common, with the planets in perhaps a third of the known multiple systems exhibiting evidence for the existence of mean-motion resonances.

R Class II: the SED falls noticeably between near- and mid-IR wavelengths. 3. 6. 1 Disks in the context of star formation log(λFλ) Class 0 10 100 log(λ/µm) 1 10 100 log(λ/µm) 1 10 100 log(λ/µm) 1 10 100 log(λ/µm) Class II (classical T Tauri star) Class III (weak-lined T Tauri star) log(λFλ) Class I log(λFλ) log(λFλ) 1 Fig. 1. Classification scheme for Young Stellar Objects. line. Classical T Tauri stars1 have an equivalent width of Hα that is in excess of ˚ These are normally Class II sources. Weak-lined T Tauri stars have an Hα 10A.

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Astrophysics of Planet Formation by Philip J. Armitage


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