ADS BibCode:
2013Msngr.152....8M
Section:
Telescopes and Instrumentation
Author(s)/Affiliation(s):
Mawet, D.; Absil, O.; Girard, J. H.; Milli, J.; O’Neal, J.; Delacroix, C.; Baudoz, P.; Boccaletti, A.; Bourget, P.; Christiaens, V.; Forsberg, P.; Gonté, F.; Habraken, S.; Hanot, C.; Karlsson, M.; Kasper, M.; Lagrange, A.; Lizon, J.; Muzic, K.; Peña, E.; Olivier, R.; Slusarenko, N.; Tacconi-Garman, L. E.; Surdej, J.
AA(ESO) AB(Département d’Astrophysique, Géophysique et Océanographie, Université de Liège, Belgium) AC(ESO) AD(ESO; Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), Université Joseph Fourier, Grenoble, France) AE(ESO) AF(Département d’Astrophysique, Géophysique et Océanographie, Université de Liège, Belgium) AG(LESIA, Observatoire de Paris, Meudon, France) AH(LESIA, Observatoire de Paris, Meudon, France) AI(ESO) AJ(Département d’Astrophysique, Géophysique et Océanographie, Université de Liège, Belgium) AK(Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Sweden) AL(ESO) AM(ESO) AN(Département d’Astrophysique, Géophysique et Océanographie, Université de Liège, Belgium) AO(Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Sweden) AP(ESO) AQ(Institut de Planétologie et d’Astro- physique de Grenoble (IPAG), Université Joseph Fourier, Grenoble, France) AR(ESO) AS(ESO) AT(ESO) AU(GDTech s.a., Liège Science Park, Belgium) AV(ESO) AW(ESO) AX(Département d’Astrophysique, Géophysique et Océanographie, Université de Liège, Belgium)
Abstract:
The installation and successful commissioning of an L'-band annular groove phase mask (AGPM) coronagraph on VLT/NACO is presented. The AGPM is a vector vortex coronagraph made from diamond sub-wavelength gratings tuned to the L'-band. The vector vortex coronagraph enables high-contrast imaging at very small inner working angles (here 0.09 arcseconds, the diffraction limit of the VLT at L'), potentially opening up a new parameter space in high-resolution imaging. During technical and science verification runs, we discovered a late-type companion at two beamwidths from an F0V star, and imaged the inner regions of β Pictoris down to the previously unexplored projected radius of 1.75 astronomical units. The circumstellar disc of β Pic was also resolved from 1 to 5 arcseconds. These results showcase the potential of the NACO L'-band AGPM over a wide range of spatial scales.
References:
Beuzit, J.-L. et al. 2010, in Pathways Towards Habitable Planets, eds. Coudé du Foresto V., Gelino D. M. & Ribas. I., ASP Conf. Series, 430, 231; Boccaletti, A. et al. 2004, PASP, 116, 1061; Chauvin, G. et al. 2010, A&A, 509, A52; Crepp, J. R. & Johnson, J. A. 2011, ApJ, 733, 126; Delacroix, C. et al. 2013, accepted by A&A Girard, J. H. V. et al. 2012, Proc. SPIE, 8447; Kasper, M. et al. 2007, A&A, 472, 321; Kenworthy, M. A. et al. 2013, ApJ, 764, 7; Lagrange, A.-M. & Chauvin, G. 2012, The Messenger, 150, 39; Macintosh, B. A. et al. 2012, Proc. SPIE, 8446; Marois, C. et al. 2008, ApJ, 673, 647; Marois, C., Macintosh, B. & Veran, J.-P. 2010, Proc. SPIE, 7736, 52; Martinache, F. et al. 2012, Proc. SPIE, 8447; Mawet, D. et al. 2005, ApJ, 633, 1191; Mawet, D. et al. 2006, A&A, 448, 801; Mawet, D. et al. 2009, Optics Express, 17, 1902; Mawet, D. et al. 2012, Proc. SPIE, 8442; Mawet, D. et al. 2013, A&A, 552, 13; Oppenheimer, B. R. et al. 2013, ApJ, 768, 24; Soummer, R., Pueyo, L. & Larkin, J. 2012, ApJ, 755, L28; Spiegel, D. S. & Burrows, A. 2012, ApJ, 745, 174; Vigan, A. et al. 2012, A&A, 544, A9

ADS BibCode:
2001Msngr.106....6H
Section:
The La Silla News Page
Author(s)/Affiliation(s):
Habraken, S.; Blanche,P.-A.; Lemaire, P.; Legros, N.; Dekker, H..; Monnet, G.
AA(Centre Spatial de Liège, Angleur (Belgium)) AB(Centre Spatial de Liège, Angleur (Belgium)) AC(Centre Spatial de Liège, Angleur (Belgium)) AD(Centre Spatial de Liège, Angleur (Belgium)) AE(European Southern Observatory (Germany)) AF(European Southern Observatory (Germany))
Abstract:
This article is a shortened, combined and updated version of papers given at the August 2001 SPIE conference on Gratings in Astronomy (Monnet et al., 2001 and Habraken et al., 2001).
References:
Barden S. C., Arns J. A. and Colburn W. S.
1998, Proc. SPIE 3355, 866.
Barden S. C., Arns J. A., Colburn W. S. and
Williams J. B. 2000, PASP 112, 809.
Bernstein G. M. et al. 2001, Proc. SPIE
4485, in print. Preprint at: http://www.astro.
lsa.umich.edu/users/garyb/PUBLICATIONS/
SPIE01/spie.pdf
Dekker H., Delabre B. and D’odorico S.
1986, Proc. SPIE 627, 339.
Enard D. and Delabre B. 1983, Proc. SPIE
445, 552.
Gaylord T.K. and Moharam M.G. 1983, J.
Opt. Soc. Am., 73, 1105.
Habraken S. and Roose S. 1991, in HOLO 3
meeting, St Louis France.
Habraken S., Renotte Y., et al. 1995 (1),
Applied Optics 34, 3595.
Habraken S., Michaux O., et al. 1995 (2),
Optics Letters 20, 2348.
Habraken S., Renotte Y., et al. 1995 (3),
Proc. SPIE 2532, 141.
Habraken S. et al. 2001, Proc. SPIE 4485, in
print.
Kogelnik H. 1969, Bell Syst. Techn. J., 48,
2909.
Monnet G. , Dekker H. and Rupprecht G.
2001, Proc. SPIE 4485, in print.
Stojanoff C.G., et al. 1997, Proc. SPIE 3010,
156.
Szeifert T. and Boehnhardt H. (eds.) 2001,
FORS1+2 Online User Manual, 53.
http://www.eso.org/instruments/fors1/use
rman/index.html