First test results and calibration methods of CONICA as a stand-alone device

Hartung, Markus; Bizenberger, Peter; Boehm, Armin; Laun, W.; Lenzen, R.; Wagner, K.

doi:10.1117/12.395543

Cited by 6 publications

(7 citation statements)

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“…We have acquired ground‐based near‐infrared imaging and polarimetric observations in visitor mode using the NACO instrument mounted on the UT4 of European Southern Observatory (ESO)'s Very Large Telescope (VLT) at Cerro Paranal, Chile, on 2004 June 18. NACO consists of the Nasmyth Adaptive Optics System and the CONICA near‐infrared camera (Lenzen et al 1998; Hartung et al 2000; Rousset et al 2003). The weather conditions were excellent and the typical optical seeing was ≈0.72 arcsec with two short peaks of 1.3 arcsec during the night.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc★

Kóspál

Ábrahám

Apai

et al. 2008

Monthly Notices of the Royal Astronomical Society

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We present the first high spatial resolution near‐infrared direct and polarimetric observations of Parsamian 21, obtained with the Nasmyth Adaptive Optics System‐CONICA instrument at the Very Large Telescope (VLT). We complemented these measurements with archival infrared observations, such as Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2) imaging, HST/Near Infrared Camera and Multi‐Object Spectrometer (NICMOS) polarimetry, photometry with the Spitzer Space Telescope's Infrared Array Camera (IRAC) and Multiband Imaging Photometer (MIPS), spectroscopy with Spitzer's Infrared Spectrograph (IRS), as well as Infrared Space Observatory (ISO) photometry. Our main conclusions are as follows: (1) we argue that Parsamian 21 is probably an FU Orionis‐type object (FUor); (2) Parsamian 21 is not associated with any rich cluster of young stars; (3) our measurements reveal a circumstellar envelope, a polar cavity and an edge‐on disc; the disc seems to be geometrically flat and extends from approximately 48 to 360 au from the star; (4) the spectral energy distribution (SED) can be reproduced with a simple model of a circumstellar disc and an envelope; (5) within the framework of an evolutionary sequence of FUors proposed by Green et al. and Quanz et al., Parsamian 21 can be classified as an intermediate‐aged object.

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Section: Observations and Data Reductionmentioning

confidence: 99%

High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc★

Kóspál

Ábrahám

Apai

et al. 2008

Monthly Notices of the Royal Astronomical Society

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“…A complete set of 3% blocking filters is available, overlapping by 50%. As the FPI is inserted into the collimated beam, for each spacing the central wavelength is dependent on field position, and yields a typical spacing dependent ring shape 3, 10 . Thus, wavelength scanning data cubes have to be sampled to get the full information over the field of view.…”

Section: Imaging Spectroscopy (Fabry Perot)mentioning

confidence: 99%

NAOS-CONICA first on sky results in a variety of observing modes

Lenzen

Hartung

Brandner³

et al. 2003

SPIE Proceedings

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251

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The Adaptive Optics NIR Instrument NAOS-CONICA has been commissioned at the VLT (UT4) between November 2001 and March 2002. After summarizing the observational capabilities of this multimode instrument in combination with the powerful AO-system, we will present first on sky results of the instrumental performance for several non-direct imaging modes: High spatial resolution slit-spectroscopy in the optical and thermal NIR region has been tested. For compact sources below 2 arcsec extension, Wollaston prism polarimetry is used. For larger objects the linear polarization pattern can be analyzed by wire grids down to the diffraction limit. Coronographic masks are applied to optimize imaging and polarimetric capabilities. The cryogenic Fabry-Perot Interferometer in combination with an 8m-telescope AO-system is shown to be a powerful tool for imaging spectroscopy (3D-scans).

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“…The observations were carried out in April 2002 during the commissioning of the NACO/VLT system (Lenzen et al 1998;Rousset et al 2003;Hartung et al 2000) in the Ks band. In order to simultaneously measure two orthogonal components of the polarized light, a Wollaston prism was introduced in the light path.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

NACO polarimetric differential imaging of TW Hya

Apai

Pascucci

Brandner

et al. 2004

A&A

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Abstract. We present high-contrast imaging data on the disk of the classical T Tauri star TW Hya. The images were obtained through the polarimetric differential imaging technique with the adaptive optics system NACO. Our commissioning data show the presence of polarized disk emission between 0.1 and 1.4 from the star. We derive the first Ks-band radial polarized intensity distribution. We show that the polarized intensity compares well to shorter wavelengths surface brightness observations and confirm the previously reported gradual slope change around 0.8 . These results show the potential of the new polarimetric differential imaging technique at 8 m-class telescopes to map the inner regions of protoplanetary disks.

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First test results and calibration methods of CONICA as a stand-alone device

Cited by 6 publications

References 0 publications

High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc★

High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc★

NAOS-CONICA first on sky results in a variety of observing modes

NACO polarimetric differential imaging of TW Hya

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