Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks around Sun-like Stars

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dc.contributor.author Silverstone, Murray
dc.date.accessioned 2019-06-12T13:19:31Z
dc.date.available 2019-06-12T13:19:31Z
dc.date.issued 2006-11-10 en_US
dc.identifier.citation Pascucci, I., et al. (2006): Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks around Sun-like Stars. The Astronomical Journal, 651(2). DOI: https://doi.org/10.1086/507761 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5728
dc.description.abstract We have carried out a sensitive search for gas emission lines at IR and millimeter wavelengths for a sample of 15 young Sun-like stars selected from our dust disk survey with Spitzer. We have used mid-IR lines to trace the warm (300-100 K) gas in the inner disk and millimeter transitions of 12^CO to probe the cold (∼20 K) outer disk. We report no gas line detections from our sample. Line flux upper limits are first converted to warm and cold gas mass limits using simple approximations allowing a direct comparison with values from the literature. We also present results from more sophisticated models following Gorti & Hollenbach that confirm and extend our simple analysis. These models show that the [S I] 25.23 μm line can set constraining limits on the gas surface density at the disk inner radius and traces disk regions up to a few AU. We find that none of the 15 systems have more than 0.04M_J of gas within a few AU from the disk inner radius for disk radii from 1 to ∼40 AU. These gas mass upper limits even in the eight systems younger that ∼30 Myr suggest that most of the gas is dispersed early. The gas mass upper limits in the 10-40 AU region, which is mainly traced by our CO data, are <2M_⊗. If these systems are analogs of the solar system, they either have already formed Uranus- and Neptune-like planets or will not form them beyond 100 Myr. Finally, the gas surface density upper limits at 1 AU are smaller than 0.01% of the minimum mass solar nebula for most of the sources. If terrestrial planets form frequently and their orbits are circularized by gas, then circularization occurs early. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject circumstellar matter en_US
dc.subject infrared: stars en_US
dc.subject planetary systems: formation en_US
dc.subject solar system: formation en_US
dc.title Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks around Sun-like Stars en_US
dc.type text en_US


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