Science with the Keck Interferometer ASTRA program

J. A. Eisner; R. Akeson; M. Colavita; A. Ghez; J. Graham; L. Hillenbrand; R. Millan-Gabet; J. D. Monnier; J. U. Pott; S. Ragland; P. Wizinowich; J. Woillez

doi:10.1117/12.856418

Science with the Keck Interferometer ASTRA program

J. A. Eisner, R. Akeson, M. Colavita, A. Ghez, J. Graham, L. Hillenbrand, R. Millan-Gabet, J. D. Monnier, J. U. Pott, S. Ragland, P. Wizinowich, J. Woillez

Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

9 Scopus citations

Abstract

The ASTrometric and phase-Referenced Astronomy (ASTRA) project will provide phase referencing and astrometric observations at the Keck Interferometer, leading to enhanced sensitivity and the ability to monitor orbits at an accuracy level of 30-100 microarcseconds. Here we discuss recent scientific results from ASTRA, and describe new scientific programs that will begin in 2010-2011. We begin with results from the "self phase referencing" (SPR) mode of ASTRA, which uses continuum light to correct atmospheric phase variations and produce a phase-stabilized channel for spectroscopy. We have observed a number of protoplanetary disks using SPR and a grism providing a spectral dispersion of ∼ 2000. In our data we spatially resolve emission from dust as well as gas. Hydrogen line emission is spectrally resolved, allowing differential phase measurements across the emission line that constrain the relative centroids of different velocity components at the 10 microarcsecond level. In the upcoming year, we will begin dual-field phase referencing (DFPR) measurements of the Galactic Center and a number of exoplanet systems. These observations will, in part, serve as precursors to astrometric monitoring of stellar orbits in the Galactic Center and stellar wobbles of exoplanet host stars. We describe the design of several scientific investigations capitalizing on the upcoming phase-referencing and astrometric capabilities of ASTRA.

Original language	English (US)
Title of host publication	Optical and Infrared Interferometry II
DOIs	https://doi.org/10.1117/12.856418
State	Published - 2010
Event	Optical and Infrared Interferometry II - San Diego, CA, United States Duration: Jun 27 2010 → Jul 2 2010

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7734
ISSN (Print)	0277-786X

Other

Other	Optical and Infrared Interferometry II
Country/Territory	United States
City	San Diego, CA
Period	6/27/10 → 7/2/10

Keywords

Interferometry

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.856418

Cite this

Eisner, J. A., Akeson, R., Colavita, M., Ghez, A., Graham, J., Hillenbrand, L., Millan-Gabet, R., Monnier, J. D., Pott, J. U., Ragland, S., Wizinowich, P., & Woillez, J. (2010). Science with the Keck Interferometer ASTRA program. In Optical and Infrared Interferometry II Article 773411 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7734). https://doi.org/10.1117/12.856418

Eisner, JA, Akeson, R, Colavita, M, Ghez, A, Graham, J, Hillenbrand, L, Millan-Gabet, R, Monnier, JD, Pott, JU, Ragland, S, Wizinowich, P & Woillez, J 2010, Science with the Keck Interferometer ASTRA program. in Optical and Infrared Interferometry II., 773411, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7734, Optical and Infrared Interferometry II, San Diego, CA, United States, 6/27/10. https://doi.org/10.1117/12.856418

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title = "Science with the Keck Interferometer ASTRA program",

abstract = "The ASTrometric and phase-Referenced Astronomy (ASTRA) project will provide phase referencing and astrometric observations at the Keck Interferometer, leading to enhanced sensitivity and the ability to monitor orbits at an accuracy level of 30-100 microarcseconds. Here we discuss recent scientific results from ASTRA, and describe new scientific programs that will begin in 2010-2011. We begin with results from the {"}self phase referencing{"} (SPR) mode of ASTRA, which uses continuum light to correct atmospheric phase variations and produce a phase-stabilized channel for spectroscopy. We have observed a number of protoplanetary disks using SPR and a grism providing a spectral dispersion of ∼ 2000. In our data we spatially resolve emission from dust as well as gas. Hydrogen line emission is spectrally resolved, allowing differential phase measurements across the emission line that constrain the relative centroids of different velocity components at the 10 microarcsecond level. In the upcoming year, we will begin dual-field phase referencing (DFPR) measurements of the Galactic Center and a number of exoplanet systems. These observations will, in part, serve as precursors to astrometric monitoring of stellar orbits in the Galactic Center and stellar wobbles of exoplanet host stars. We describe the design of several scientific investigations capitalizing on the upcoming phase-referencing and astrometric capabilities of ASTRA.",

keywords = "Interferometry",

author = "Eisner, {J. A.} and R. Akeson and M. Colavita and A. Ghez and J. Graham and L. Hillenbrand and R. Millan-Gabet and Monnier, {J. D.} and Pott, {J. U.} and S. Ragland and P. Wizinowich and J. Woillez",

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T1 - Science with the Keck Interferometer ASTRA program

AU - Eisner, J. A.

AU - Akeson, R.

AU - Colavita, M.

AU - Ghez, A.

AU - Graham, J.

AU - Hillenbrand, L.

AU - Millan-Gabet, R.

AU - Monnier, J. D.

AU - Pott, J. U.

AU - Ragland, S.

AU - Wizinowich, P.

AU - Woillez, J.

PY - 2010

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N2 - The ASTrometric and phase-Referenced Astronomy (ASTRA) project will provide phase referencing and astrometric observations at the Keck Interferometer, leading to enhanced sensitivity and the ability to monitor orbits at an accuracy level of 30-100 microarcseconds. Here we discuss recent scientific results from ASTRA, and describe new scientific programs that will begin in 2010-2011. We begin with results from the "self phase referencing" (SPR) mode of ASTRA, which uses continuum light to correct atmospheric phase variations and produce a phase-stabilized channel for spectroscopy. We have observed a number of protoplanetary disks using SPR and a grism providing a spectral dispersion of ∼ 2000. In our data we spatially resolve emission from dust as well as gas. Hydrogen line emission is spectrally resolved, allowing differential phase measurements across the emission line that constrain the relative centroids of different velocity components at the 10 microarcsecond level. In the upcoming year, we will begin dual-field phase referencing (DFPR) measurements of the Galactic Center and a number of exoplanet systems. These observations will, in part, serve as precursors to astrometric monitoring of stellar orbits in the Galactic Center and stellar wobbles of exoplanet host stars. We describe the design of several scientific investigations capitalizing on the upcoming phase-referencing and astrometric capabilities of ASTRA.

AB - The ASTrometric and phase-Referenced Astronomy (ASTRA) project will provide phase referencing and astrometric observations at the Keck Interferometer, leading to enhanced sensitivity and the ability to monitor orbits at an accuracy level of 30-100 microarcseconds. Here we discuss recent scientific results from ASTRA, and describe new scientific programs that will begin in 2010-2011. We begin with results from the "self phase referencing" (SPR) mode of ASTRA, which uses continuum light to correct atmospheric phase variations and produce a phase-stabilized channel for spectroscopy. We have observed a number of protoplanetary disks using SPR and a grism providing a spectral dispersion of ∼ 2000. In our data we spatially resolve emission from dust as well as gas. Hydrogen line emission is spectrally resolved, allowing differential phase measurements across the emission line that constrain the relative centroids of different velocity components at the 10 microarcsecond level. In the upcoming year, we will begin dual-field phase referencing (DFPR) measurements of the Galactic Center and a number of exoplanet systems. These observations will, in part, serve as precursors to astrometric monitoring of stellar orbits in the Galactic Center and stellar wobbles of exoplanet host stars. We describe the design of several scientific investigations capitalizing on the upcoming phase-referencing and astrometric capabilities of ASTRA.

KW - Interferometry

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

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Science with the Keck Interferometer ASTRA program

Abstract

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Keywords

ASJC Scopus subject areas

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