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http://hdl.handle.net/2248/4899
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DC Field | Value | Language |
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dc.contributor.author | Tata, R | - |
dc.contributor.author | Martin, E. L | - |
dc.contributor.author | Sengupta, S | - |
dc.contributor.author | Phan-Bao, N | - |
dc.contributor.author | Zapatero Osorio, M. R | - |
dc.contributor.author | Bouy, H | - |
dc.date.accessioned | 2009-11-05T13:59:57Z | - |
dc.date.available | 2009-11-05T13:59:57Z | - |
dc.date.issued | 2009-12 | - |
dc.identifier.citation | Astronomy and Astrophysics, Vol. 508, No. 3, pp. 1423 - 1427 | en |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.uri | http://hdl.handle.net/2248/4899 | - |
dc.description | Open Access | - |
dc.description.abstract | Aims.Recent studies have detected linear polarization in L dwarfs in the optical I band. Theoretical models have been developed to explain this polarization. These models predict higher polarization at shorter wavelengths. We discuss the polarization in the R and I band of 4 ultra cool dwarfs. Methods.We report linear polarization measurements of 4 ultra cool dwarfs in the R and I bands using the Intermediate dispersion Spectrograph and Imaging System (ISIS) mounted on the 4.2m William Herschel Telescope (WHT). Results.As predicted by theoretical models, we find a higher degree of polarization in the R band when compared to polarization in the I band for 3/4 of these ultra cool dwarfs. This suggests that dust scattering asymmetry is caused by oblateness >.We also show how these measurements fit the theoretical models. A case for variability of linear polarization is found, which suggests the presence of randomly distributed dust clouds. We also discuss one case for the presence of a cold debris disk. | en |
dc.language.iso | en | en |
dc.publisher | European Space Agency | en |
dc.relation.uri | http://dx.doi.org/10.1051/0004-6361/200911830 | - |
dc.rights | © European Space Agency | en |
dc.subject | Polarization | en |
dc.subject | Atmospheric Effects | en |
dc.subject | Brown Dwarfs | en |
dc.subject | Stars: Low-Mass | en |
dc.title | Optical linear polarization in ultra cool dwarfs: A tool to probe dust in the ultra cool dwarf atmospheres | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Optical linear polarization in ultra cool dwarfs | Open Access | 137.37 kB | Adobe PDF | ![]() View/Open |
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