Evolution of Mid-IR Excess Around Sun-like Stars Constraints on Models of Terrestrial Plane.pdf

下载文档

3
0
约2.38万字
约 12页
2017-04-06 发布于江苏
举报
版权申诉
保障服务

Evolution of Mid-IR Excess Around Sun-like Stars Constraints on Models of Terrestrial Plane.pdf

1、本文档共12页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

Evolution of Mid-IR Excess Around Sun-like Stars Constraints on Models of Terrestrial Plane

a r X i v : 0 7 1 2 .1 0 5 7 v 1 [ a s t r o - p h ] 6 D e c 2 0 0 7 Evolution of Mid–IR Excess Around Sun–like Stars: Constraints on Models of Terrestrial Planet Formation M.R. Meyer1, J.M. Carpenter2, E.E. Mamajek3, L.A. Hillenbrand2, D. Hollenbach4, A. Moro–Martin5, J.S. Kim1, M.D. Silverstone1, J. Najita6, D.C. Hines7, I. Pascucci1, J.R. Stauffer8, J. Bouwman9, D.E. Backman10 ABSTRACT We report observations from the Spitzer Space Telescope (SST) regarding the frequency of 24 μm excess emission toward sun-like stars. Our unbiased sample is comprised of 309 stars with masses 0.7-2.2 M⊙ and ages from 3 Myr to 3 Gyr that lack excess emission at wavelengths ≤8 μm. We identify 30 stars that exhibit clear evidence of excess emission from the observed 24/8μm flux ratio. The implied 24 μm excesses of these candidate debris disk systems range from 13 % (the minimum detectable) to more than 100% compared to the expected photospheric emission. The frequency of systems with evidence for dust debris emitting at 24 μm ranges from 8.5–19 % at ages 300 Myr to 4 % for older stars. The results suggest that many, perhaps most, sun-like stars might form terrestrial planets. Subject headings: planetary systems: formation; infrared: stars; stars: circum- stellar matter 1Steward Observatory, The University of Arizona, Tucson, AZ; mmeyer, serena, msilverstone, pascucci – @as.arizona.edu 2Astronomy, California Institute of Technology, Pasadena, CA; jmc, lah – @astro.caltech.edu 3Harvard–Smithsonian CfA, Cambridge, MA; emamajek@cfa.harvard.edu 4NASA–Ames Research Center, Moffett Field, CA; hollenbach@ism.arc.nasa.gov 5Astronomy, Princeton University, Princeton, NJ; amaya@astro.princeton.edu 6National Optical Astronomy Observatory, Tucson, AZ; jnajita@noao.edu 7Space Science Institute, Boulder, CO; hines@spacescience.org 8Spitzer Science Center, Pasadena, CA; stauffer@ipac.caltech.edu 9Max–Planck Institut fu?r Astronomie, Heidelberg, Germany; bouwman@mpia.mpg.de 10SETI Institute,