Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Brummelaar, Theo A. ten; Mason, Brian D.; Bagnuolo, W. G.; Hartkopf, William I.; McAlister, H. A.; Turner, N.

doi:10.1086/118088

Cited by 35 publications

(26 citation statements)

References 17 publications

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“…Pipeline processing produces an image of the object in each of 23 wave bands resulting in a data cube. For the unocculted data cubes, we measured the binary star astrometry on each of the individual image frames with the program FITSTARS; it uses an iterative blind deconvolution that fits the location of delta functions and their relative intensity to the data (ten Brummelaar et al 1996(ten Brummelaar et al , 2000. After throwing out any image frames that failed to converge to a physical solution, the position angle and separation were computed as the weighted mean of the results from all the frames.…”

Section: Discussionmentioning

confidence: 99%

Spectral Typing of Late-Type Stellar Companions to Young Stars From Low-Dispersion Near-Infrared Integral Field Unit Data

Roberts

Rice

Beichman

et al. 2012

The Astronomical Journal

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We used the Project 1640 near-infrared coronagraph and integral field spectrograph to observe 19 young solartype stars. Five of these stars are known binary stars and we detected the late-type secondaries and were able to measure their JH spectra with a resolution of R ∼ 30. The reduced, extracted, and calibrated spectra were compared to template spectra from the IRTF spectral library. With this comparison, we test the accuracy and consistency of spectral-type determination with the low-resolution near-infrared spectra from P1640. Additionally, we determine effective temperature and surface gravity of the companions by fitting synthetic spectra calculated with the PHOENIX model atmosphere code. We also present several new epochs of astrometry of each of the systems. Together, these data increase our knowledge and understanding of the stellar make up of these systems. In addition to the astronomical results, the analysis presented helps validate the Project 1640 data reduction and spectral extraction processes and the utility of low-resolution, near-infrared spectra for characterizing late-type companions in multiple systems.

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Section: Discussionmentioning

confidence: 99%

Spectral Typing of Late-Type Stellar Companions to Young Stars From Low-Dispersion Near-Infrared Integral Field Unit Data

Roberts

Rice

Beichman

et al. 2012

The Astronomical Journal

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“…This method is similar to what the routine fitstars, presented in ten Brummelaar et al (1996Brummelaar et al ( , 2000, does to calculate the photometry of binaries. In the following paragraphs we describe this method in more detail.…”

Section: Photometry With Irdismentioning

confidence: 99%

Performance of the VLT Planet Finder SPHERE

Zurlo

Vigan

Mesa

et al. 2014

A&A

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Context. The new planet finder for the Very Large Telescope (VLT), the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE), just had its first light in Paranal. A dedicated instrument for the direct detection of planets, SPHERE, is composed of a polametric camera in visible light, the Zurich IMager POLarimeter (ZIMPOL), and two near-infrared sub-systems: the Infra-Red Dual-beam Imager and Spectrograph (IRDIS), a multi-purpose camera for imaging, polarimetry, and long-slit spectroscopy, and the integral field spectrograph (IFS), an integral field spectrograph. Aims. We present the results obtained from the analysis of data taken during the laboratory integration and validation phase, after the injection of synthetic planets. Since no continuous field rotation could be performed in the laboratory, this analysis presents results obtained using reduction techniques that do not use the angular differential imaging (ADI) technique. Methods. To perform the simulations, we used the instrumental point spread function (PSF) and model spectra of L and T-type objects scaled in contrast with respect to the host star. We evaluated the expected error in astrometry and photometry as a function of the signal to noise of companions, after spectral differential imaging (SDI) reduction for IRDIS and spectral deconvolution (SD) or principal component analysis (PCA) data reductions for IFS. Results. We deduced from our analysis, for example, that β Picb, a 12 Myr old planet of ∼10 M Jup and semi-major axis of 9-10 AU, would be detected with IRDIS with a photometric error of 0.16 mag and with a relative astrometric position error of 1.1 mas. With IFS, we could retrieve a spectrum with error bars of about 0.15 mag on each channel and astrometric relative position error of 0.6 mas. For a fainter object such as HR 8799d, a 13 M Jup planet at a distance of 27 AU, IRDIS could obtain a relative astrometric error of 3 mas.

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“…A detection system with higher angular resolution (e.g., long-baseline optical interferometry) or more dynamic sensitivity (e.g., adaptive optics) is encouraged. The *m limitations of past adaptive optics work (e.g., ten Brummelaar et al 1996Brummelaar et al , 2000 have been largely self-imposed, the result of observing known binaries with relatively small magnitude di †erences. Recent work by Turner et al (2001) reports investigating nearby …”

Section: Calibration and Analysismentioning

confidence: 99%

Speckle Interferometry of New and Problem [ITAL]HIPPARCOS[/ITAL][ITAL]Hipparcos[/ITAL] Binaries. II. Observations Obtained in 1998–1999 from M[CLC]c[/CLC]Donald Observatory

Mason

Hartkopf

Holdenried

et al. 2001

The Astronomical Journal

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The Hipparcos satellite made measurements of over 9734 known double stars, 3406 new double stars, and 11,687 unresolved but possible double stars. The high angular resolution a †orded by speckle interferometry makes it an efficient means to conÐrm these systems from the ground, which were Ðrst discovered from space. Because of its coverage of a di †erent region of angular separationÈmagnitude di †erence (o-*m) space, speckle interferometry also holds promise to ascertain the duplicity of the unresolved Hipparcos "" problem ÏÏ stars. Presented are observations of 116 new Hipparcos double stars and 469 Hipparcos "" problem stars,ÏÏ as well as 238 measures of other double stars and 246 other high-quality nondetections. Included in these are observations of double stars listed in the Tycho-2 Catalogue and possible grid stars for the Space Interferometry Mission.

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Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Cited by 35 publications

References 17 publications

Spectral Typing of Late-Type Stellar Companions to Young Stars From Low-Dispersion Near-Infrared Integral Field Unit Data

Spectral Typing of Late-Type Stellar Companions to Young Stars From Low-Dispersion Near-Infrared Integral Field Unit Data

Performance of the VLT Planet Finder SPHERE

Speckle Interferometry of New and Problem [ITAL]HIPPARCOS[/ITAL][ITAL]Hipparcos[/ITAL] Binaries. II. Observations Obtained in 1998–1999 from M[CLC]c[/CLC]Donald Observatory

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