FIRST<i>L</i>-BAND INTERFEROMETRIC OBSERVATIONS OF A YOUNG STELLAR OBJECT: PROBING THE CIRCUMSTELLAR ENVIRONMENT OF MWC 419

Ragland, Sam; Akeson, Rachel; Armandroff, T. E.; Colavita, M. M.; Danchi, W. C.; Hillenbrand, Lynne A.; Millan-Gabet, R.; Ridgway, Stephen T.; Traub, Wesley A.; Vasisht, Gautam; Wizinowich, Peter

doi:10.1088/0004-637x/703/1/22

Cited by 14 publications

(19 citation statements)

References 42 publications

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“…As shown in Figure 8, the off-axis residuals are ∼117 nm RMS at 10 Hz, providing a square fringe contrast of 0.89. If the offaxis instrument were operating at longer wavelengths, using the L-band fringe tracker (Ragland et al 2009) . Typical OPD control performance provided by the fast primary fringe tracker, obtained on a bright K = 7.45 target.…”

Section: Limiting Magnitudementioning

confidence: 99%

First Faint Dual-Field Off-Axis Observations in Optical Long Baseline Interferometry

Woillez

Wizinowich

Akeson

et al. 2014

ApJ

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Ground-based long baseline interferometers have long been limited in sensitivity in part by the short integration periods imposed by atmospheric turbulence. The first observation fainter than this limit was performed on 2011 January 22 when the Keck Interferometer observed a K = 11.5 target, about 1 mag fainter than its K = 10.3 atmospherically imposed limit; the currently demonstrated limit is K = 12.5. These observations were made possible by the Dual-Field Phase-Referencing (DFPR) instrument, part of the NSF-funded ASTrometry and phase-Referenced Astronomy project; integration times longer than the turbulence time scale are made possible by its ability to simultaneously measure the real-time effects of the atmosphere on a nearby bright guide star and correct for it on the faint target. We present the implementation of DFPR on the Keck Interferometer. Then, we detail its on-sky performance focusing on the accuracy of the turbulence correction and the resulting fringe contrast stability.

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Section: Limiting Magnitudementioning

confidence: 99%

First Faint Dual-Field Off-Axis Observations in Optical Long Baseline Interferometry

Woillez

Wizinowich

Akeson

et al. 2014

ApJ

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“…The Keck Interferometer (KI) has unique operational capabilities such as sensitive V 2 measurements in the K band, V 2 measurements in the L band 9 , and nulling measurements in the N band 10 . Other operational capabilities include H-band V 2 and high spectral resolution measurements through self-phase referencing (V The adaptive optics and angle tracking limits are as follows:…”

Section: Current Capabilitiesmentioning

confidence: 99%

Recent progress at the Keck interferometer

Ragland¹,

Akeson²,

Colavita³

et al. 2012

Optical and Infrared Interferometry III

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The Keck Interferometer (KI) combines the two 10m diameter Keck telescopes providing milliarcsecond angular resolution. KI has unique observing capabilities such as sensitive K-band V 2 , L-band V 2 and N-band nulling modes. The instrument improvements and status of the Keck Interferometer since the 2010 SPIE meeting are summarized. We discuss the current capabilities of the KI, operational improvements, and the science from the KI during the past two years. We will conclude with a brief note on the closure of the KI facility. Details of dual field phase referencing developments and nulling science results are presented elsewhere at this conference.

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“…Kraus et al (2008b) studied the geometry and the physical conditions in the inner circumstellar region around the young Herbig Be star MWC 147 using the long-baseline IOTA/FLOUR spectro-interferometry in the near-infrared K and H-bands VLTI/AMBER observations, PTI archive data, as well as the mid-infrared N-band VLTI/MIDI observations. Ragland et al (2009) presented spatially resolved K-and L-band spectra (at spectral resolutions R = 230 and R = 60 respectively) of MWC 419, obtained with a configuration of the 85 m baseline Keck Interferometer. Isella et al (2008) investigated the origin of the near-infrared emission of the Herbig Ae star MWC 758 on sub-astronomical unit scales using spectrally dispersed low resolution (R = 35) VLTI/AMBER interferometric observations in the H and K bands.…”

Section: Herbig Ae/be Starsmentioning

confidence: 99%

Astronomical optical interferometry, II: Astrophysical results

Jankov

2011

SERBIAN ASTRON J

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Optical interferometry is entering a new age with several ground- based long-baseline observatories now making observations of unprecedented spatial resolution. Based on a great leap forward in the quality and quantity of interferometric data, the astrophysical applications are not limited anymore to classical subjects, such as determination of fundamental properties of stars; namely, their effective temperatures, radii, luminosities and masses, but the present rapid development in this field allowed to move to a situation where optical interferometry is a general tool in studies of many astrophysical phenomena. Particularly, the advent of long-baseline interferometers making use of very large pupils has opened the way to faint objects science and first results on extragalactic objects have made it a reality. The first decade of XXI century is also remarkable for aperture synthesis in the visual and near-infrared wavelength regimes, which provided image reconstructions from stellar surfaces to Active Galactic Nuclei. Here I review the numerous astrophysical results obtained up to date, except for binary and multiple stars milliarcsecond astrometry, which should be a subject of an independent detailed review, taking into account its importance and expected results at microarcsecond precision level. To the results obtained with currently available interferometers, I associate the adopted instrumental settings in order to provide a guide for potential users concerning the appropriate instruments which can be used to obtain the desired astrophysical information

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FIRSTL-BAND INTERFEROMETRIC OBSERVATIONS OF A YOUNG STELLAR OBJECT: PROBING THE CIRCUMSTELLAR ENVIRONMENT OF MWC 419

Cited by 14 publications

References 42 publications

First Faint Dual-Field Off-Axis Observations in Optical Long Baseline Interferometry

First Faint Dual-Field Off-Axis Observations in Optical Long Baseline Interferometry

Recent progress at the Keck interferometer

Astronomical optical interferometry, II: Astrophysical results

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