| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Adaptive Optics Nulling Interferometric Constraints on the Mid-Infrared Exozodiacal Dust Emission around Vega | W.M. Liu
; P.M. Hinz
; W.F. Hoffmann
; G. Brusa
; F. Wildi
; D. Miller
; M. Lloyd-Hart
; M.A. Kenworthy
; P.C. McGuire
; J.R.P. Angel ( Steward Observatory
; Osservatorio Astrofisico di Arcetri
; EIVD
; West Switzerland University of Applied Sciences Centro de Astrobiologia
; | Date: |
25 Jun 2004 | Journal: | Astrophys.J. 610 (2004) L125-L128 | Subject: | astro-ph | Affiliation: | 1,2), F. Wildi (1,3), D. Miller , M. Lloyd-Hart , M.A. Kenworthy , P.C. McGuire (1,4), and J.R.P. Angel ( Steward Observatory, Osservatorio Astrofisico di Arcetri, EIVD, West Switzerland University of Applied Sciences Centro de Astrobiologia (INTA | Abstract: | We present the results of mid-infrared nulling interferometric observations of the main-sequence star alpha Lyr (Vega) using the 6.5 m MMT with its adaptive secondary mirror. From the observations at 10.6 microns, we find that there is no resolved emission from the circumstellar environment (at separations greater than 0.8 AU) above 2.1% (3 sigma limit) of the level of the stellar photospheric emission. Thus, we are able to place an upper limit on the density of dust in the inner system of 650 times that of our own solar system’s zodiacal cloud. This limit is roughly 2.8 times better than those determined with photometric excess observations such as those by IRAS. Comparison with far-infrared observations by IRAS shows that the density of warm dust in the inner system (< 30 AU) is significantly lower than cold dust at larger separations. We consider two scenarios for grain removal, the sublimation of ice grains and the presence of a planetary mass "sweeper." We find that if sublimation of ice grains is the only removal process, a large fraction (> 80%) of the material in the outer system is ice. | Source: | arXiv, astro-ph/0406587 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |