2011 Fiscal Year Final Research Report
Observational study of protoplanetary disk dispersal mechanism using metallicity dependence
| Project/Area Number |
22840046
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
YASUI Chikako 国立天文台, ALMA推進室, 研究員 (00583626)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 星・惑星形成 / 赤外線天文学 / 電波天文学 |
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| Research Abstract |
It is essential to clarify the mechanism of protoplanetary disk dispersal for understanding planet formation processes. We observed star-forming regions in higher and lower metallicity environments with Subaru 8.2m telescope and found the metallicity dependence of disk lifetime : the longer lifetime in higher metallicity environments. Our results suggest that photoevaporation by FUV and/or X-ray is one of the most dominant mechanism in disk dispersal process. We also quantitatively estimated disk lifetime of intermediate-mass stars for the first time and found that the lifetime is about half of that for low-mass stars and that the innermost disk disappears in very short timescale while entire disk disappears almost simultaneously for low-mass stars.
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