First High-Contrast Imaging Using a Gaussian Aperture Pupil Mask

Debes, John H.; Ge, Jian; Chakraborty, Abhijit

doi:10.1086/341876

Cited by 38 publications

(23 citation statements)

References 22 publications

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“…Turner et al (2002) detected a companion to HD 161797 ( Her) with a dynamic range of Á I of 7.26 and a Á R of 9.29. This companion was confirmed by Debes et al (2002). Metchev & Hillenbrand (2004) detected a companion to HD 49197 with a ÁJ of 9.6 and confirmed it at a later epoch.…”

Section: Are These Real?mentioning

confidence: 71%

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

2007

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We carried out a search for companions to B stars using the adaptive optics system of the Advanced ElectroOptical System 3.6 m telescope. We observed 70 B stars in the I band, finding 16 companions, 10 of which are newly discovered companions. For each system with a detected companion we give its measured astrometry and differential magnitude. We then put the observation in context of the system's known multiplicity and provide a somewhat crude estimate of its spectral type based on the single differential magnitude measurement. The separations range from 0.2 00 to 7.31 00 , and the differential magnitudes range from 1:41 AE 0:01 to 10:1 AE 0:5. Finally, we present a list of the null detections and discuss the implications of null detections of selected stars.

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Section: Are These Real?mentioning

confidence: 71%

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

2007

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“…In order to demonstrate that the principle of the APP was valid, we observed a nearby binary system, with the purpose of confirming the nature of the fainter component as determined by Debes et al (2002) and to obtain astrometric measurements for determining the dynamical mass of the system. The star Her A was observed with the earlier prototype of the APP at 2006 April 13 UT 12 : 48 using the Clio camera at the f/15 Cassegrain focus of the MMTO 6.5 m telescope on Mount Hopkins, with the AO system operating in closed loop on the target star.…”

Section: The Her a Systemmentioning

confidence: 99%

First On‐Sky High‐Contrast Imaging with an Apodizing Phase Plate

Kenworthy

Codona

Hinz

et al. 2007

ApJ

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We present the first astronomical observations obtained with an apodizing phase plate (APP). The plate is designed to suppress the stellar diffraction pattern by 5 mag from 2 À 9k/D over a 180 region. Stellar images were obtained in the M 0 band (k c ¼ 4:85 m) at the MMTO 6.5 m telescope, with adaptive wave-front correction made with a deformable secondary mirror designed for low thermal background observations. The measured point-spread function (PSF) shows a halo intensity of 0.1% of the stellar peak at 2k/D (0.36 00 ), tapering off as r À5=3 out to radius 9k/D. Such a profile is consistent with residual errors predicted for servo lag in the AO system. We project a 5 contrast limit, set by residual atmospheric fluctuations, of 10.2 mag at 0.36 00 separation for a 1 hr exposure. This can be realized if static and quasi-static aberrations are removed by differential imaging, and is close to the sensitivity level set by thermal background photon noise for target stars with M 0 > 3. The advantage of using the phase plate is the removal of speckle noise caused by the residuals in the diffraction pattern that remain after PSF subtraction. The APP gives higher sensitivity over the range (2Y5) k/D than direct imaging techniques.

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“…This fraction of light depends on the correction performance (for a Strehl ratio of 50%, only half of the light interferes), and the contrast is hardly less than a few percent at a separation of 1.0 (Baudoz et l/D al. 2000b;Debes et al 2002;Boccaletti et al 2004). The next generation of extreme adaptive optics should allow us to get a better correction of the wave front, and the HIC is especially well suited for such instruments, since its performance can be improved when working with centrally obscured pupils.…”

Section: Laboratory Testmentioning

confidence: 99%

Stellar Coronagraphy: Study and Test of a Hybrid Interfero‐Coronagraph

Baudoz¹,

Boccaletti²,

Rabbia³

et al. 2005

PUBL ASTRON SOC PAC

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ABSTRACT. We present a device for high dynamic range imaging of faint structures in the close angular vicinity of stars. An advantage of this device is the capacity to explore the field of view both uniformly and as close (or near) to the parent star as allowed by the diffraction limit of the telescope. The design is adapted from the Achromatic Interfero-Coronagraph (AIC), which suppresses the light scattered by diffraction from an on-axis unresolved source, but yields two twin images of the stellar environment, displayed symmetrically in the focal plane (Gay & Rabbia 1996;Baudoz et al. 2000a). Our Hybrid Interfero-Coronagraph (HIC) avoids the 180Њ ambiguity and is therefore well suited for the study of extended objects distributed all around the star. Like the AIC, the on-axis extinction with HIC is based on destructive interference after amplitude division of the incident field from a single telescope. An achromatic p-dephasing and a spatial filtering of the wave front are performed on one arm of the interferometer. The interferometric process occurs between the wave front from the star and a spatially filtered wave front. Because of this spatial filtering, the destructive process no longer remains achromatic. However, the residual chromaticity is compatible with astrophysical applications on ground-based telescopes. Numerical simulations show that HIC performance does not suffer from telescope central obscuration. An appropriate size of the spatial filtering mask and a suitable apodization allow the nulling of an on-axis unresolved star at the level of 10 Ϫ6

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First High-Contrast Imaging Using a Gaussian Aperture Pupil Mask

Cited by 38 publications

References 22 publications

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

First On‐Sky High‐Contrast Imaging with an Apodizing Phase Plate

Stellar Coronagraphy: Study and Test of a Hybrid Interfero‐Coronagraph

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