J/A+A/546/A24 VLT/NaCo images of HD 142527 (Rameau+, 2012)
High-contrast imaging of the close environment of HD 142527. VLT/NaCo adaptive
optics thermal and angular differential imaging.
Rameau J., Chauvin G., Lagrange A.-M., Thebault P., Milli J., Girard J.,
Bonnefoy M.
<Astron. Astrophys. 546, A24 (2012)>
=2012A&A...546A..24R 2012A&A...546A..24R
ADC_Keywords: Stars, variable ; Stars, pre-main sequence
Keywords: instrumentation: adaptive optics -
stars: variables: T Tauri, Herbig Ae/Be -
stars: individual: HD 142527 - protoplanetary disks
Abstract:
It has long been suggested that circumstellar disks surrounding young
stars may be the signposts of planets, and even more so since the
recent discoveries of embedded substellar companions. According to
models, the planet-disk interaction may create large structures, gaps,
rings, or spirals in the disk. In that sense, the Herbig star
HD 142527 is particularly compelling, as its massive disk displays
intriguing asymmetries that suggest the existence of a dynamical
peturber of unknown nature.
Our goal was to obtain deep thermal images of the close circumstellar
environment of HD 142527 to re-image the reported close-in
structures (cavity, spiral arms) of the disk and to search for stellar
and substellar companions that could be connected to their presence.
Description:
The provided data were taken on 2009/07/29 with VLT/NaCo which is an
adaptive optics imager, in thermal L' band imaging. The plate scale
used was 27.1mas/pixel with the L27 camera. The observing mode was
angular differential imaging with a 512x514 window, with an
integration time of 0.2s, so that the total exposure time is 2580s. A
PSF reference star was also observed within the same parallactic angle
variation and observing conditions (HD 181296). For more details into
the observing strategy and conditions, please refer to section 2.1.
Objects:
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RA (2000) DE Designation(s)
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15 56 41.89 -42 19 23.3 HD 142527 = HIP 78092
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 116 2 List of FITS images
fig/* . 2 FITS images
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Description of file:
fig1.fits : Units are in ADU. 2D image showing the result of the PSF
reference- subtracted technique with a scaling factor of 2.2 between the
two stars. North is up, East to the left. The center of the image is the
stellar position. For more details, please refer to section 2.2 of
the paper.
fig5.fits : Units are in magnitude of contrast level (ΔL').
2D detection limits by measuring the 5 sigma noise within a sliding box
of 5x5 pixels into the LOCI reduced image. North is Up, East to the left.
For more details, please refer to section 4.2 of the paper.
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 3 I3 pix Nx Number of pixels along X-axis
4 A1 --- --- [x]
5- 7 I3 pix Ny Number of pixels along Y-axis
9- 17 A9 --- FileName Name of FITS file in subdirectory fig
19-116 A98 --- Title Title of the file
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Acknowledgements:
Julien Rameau, julien.rameau(at)obs.ujf-grenoble.fr
(End) Patricia Vannier [CDS] 28-Sep-2012