scholarly journals The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects

Author(s):  
Steve Ertel ◽  
Phil Hinz ◽  
Denis Defrère ◽  
Bertrand Mennesson ◽  
Grant Kennedy ◽  
...  
2013 ◽  
Vol 8 (S299) ◽  
pp. 338-339 ◽  
Author(s):  
S. Ertel ◽  
J.-C. Augereau ◽  
P. Thébault ◽  
O. Absil ◽  
A. Bonsor ◽  
...  

AbstractExozodiacal dust clouds are thought to be the extrasolar analogs of the Solar System's zodiacal dust. Studying these systems provides insights in the architecture of the innermost regions of planetary systems, including the Habitable Zone. Furthermore, the mere presence of the dust may result in major obstacles for direct imaging of earth-like planets. Our EXOZODI project aims to detect and study exozodiacal dust and to explain its origin. We are carrying out the first large, near-infrared interferometric survey in the northern (CHARA/FLUOR) and southern (VLTI/PIONIER) hemispheres. Preliminary results suggest a detection rate of up to 30% around A to K type stars and interesting trends with spectral type and age. We focus here on presenting the observational work carried out by our team.


1987 ◽  
Vol 36 (3) ◽  
pp. 175-182 ◽  
Author(s):  
H. J. Hoekstra ◽  
W. F. Sindelar ◽  
T. J. Kinsella ◽  
J. Oldhoff

2000 ◽  
Vol 176 ◽  
pp. 25-30
Author(s):  
Michael D. Albrow ◽  
K. R. Pollard ◽  
J.-P. Beaulieu ◽  
J. A. R. Caldwell ◽  
J. Menzies ◽  
...  

AbstractWe review the current status and future prospects of the PLANET collaboration, an international team of astronomers performing high-precision photometric monitoring of microlensing events. Our photometric precision and sampling is characterised and the suitability of the database for variable star studies is discussed. Preliminary results on K-giant stability are presented.


1988 ◽  
Vol 139 (5) ◽  
pp. 1136-1136
Author(s):  
H.J. Hoekstra ◽  
W.F. Sindelar ◽  
T.J. Kinsella ◽  
J. Oldhoff

1998 ◽  
Vol 11 (1) ◽  
pp. 555-557
Author(s):  
A. Baglin

The theory of stellar interiors is generally considered as well settled, and many branches of astrophysics rely on its results. However, the true situation is not so bright. Despite great successes at its beginning, in the sixties, it has to deal with many physical processes, generally poorly understood, which have large influences on the results and the derived quantities, like for instance ages. After a rapid description of these difficulties, I will recall the majorquestions of the confrontation between theory and observations, and how HIPPARCOS can and will help. As an illustration, a few preliminary results will be presented, and future prospects foreseen. But, this short review is byno means exhaustive; there are many more results dealing directly or indirectly with stellar structure theory which have already been presented at theVenice Symposium (Perryman et al, 1997a), and many more, I am not aware of, will certainly appear soon.


2015 ◽  
Vol 234 (1-3) ◽  
pp. 33-39 ◽  
Author(s):  
H. Fujioka ◽  
◽  
Y. Ayyad ◽  
J. Benlliure ◽  
K.-T. Brinkmann ◽  
...  

Author(s):  
Andrey V. REZAEV ◽  
Natalia D. TREGUBOVA

Current sociology doesn’t have a settled view on what to do with a phenomenon that in the literature has been titled as “artificial intelligence” (AI). Sociological textbooks, handbooks, encyclopedias, and sociology classes’ syllabi typically either don’t have entries about AI at all or talk about it haphazardly with a stress on AI’s social effects and without discerning the underlying logic that moves the prodigy on. This paper is an invitation to a professional conversation about what and how social sciences can/should study “artificial intelligence”. It is based on a discussion of the preliminary results of an on-going three-year research project that has been launched at the ISA Congress in Toronto. The paper examines AI in relation with ‘artificial sociality’. It argues that research on AI-based technologies is flourishing mainly outside established disciplinary boundaries. Thus, social sciences have to look for new theoretical and methodological frameworks to approach AI and ‘artificial sociality’.


1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.


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