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Proceedings Paper

First Keck Interferometer measurements in self-phase referencing mode: spatially resolving circum-stellar line emission of 48 Lib
Author(s): J-U. Pott; J. Woillez; S. Ragland; P. L. Wizinowich; J. A. Eisner; J. D. Monnier; R. L. Akeson; A. M. Ghez; J. R. Graham; L. A. Hillenbrand; R. Millan-Gabet; E. Appleby; B. Berkey; M. M. Colavita; A. Cooper; C. Felizardo; J. Herstein; M. Hrynevych; D. Medeiros; D. Morrison; T. Panteleeva; B. Smith; K. Summers; K. Tsubota; C. Tyau; E. Wetherell
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Paper Abstract

Recently, the Keck interferometer was upgraded to do self-phase-referencing (SPR) assisted K-band spectroscopy at R ~ 2000. This means, combining a spectral resolution of 150 km/s with an angular resolution of 2.7 mas, while maintaining high sensitiviy. This SPR mode operates two fringe trackers in parallel, and explores several infrastructural requirements for off-axis phase-referencing, as currently being implemented as the KI-ASTRA project. The technology of self-phasereferencing opens the way to reach very high spectral resolution in near-infrared interferometry. We present the scientific capabilities of the KI-SPR mode in detail, at the example of observations of the Be-star 48 Lib. Several spectral lines of the cirumstellar disk are resolved. We describe the first detection of Pfund-lines in an interferometric spectrum of a Be star, in addition to Br γ. The differential phase signal can be used to (i) distinguish circum-stellar line emission from the star, (ii) to directly measure line asymmetries tracing an asymetric gas density distribution, (iii) to reach a differential, astrometric precision beyond single-telescope limits sufficient for studying the radial disk structure. Our data support the existence of a radius-dependent disk density perturbation, typically used to explain slow variations of Be-disk hydrogen line profiles.

Paper Details

Date Published: 21 July 2010
PDF: 6 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77340P (21 July 2010); doi: 10.1117/12.856922
Show Author Affiliations
J-U. Pott, Max-Planck-Institut für Astronomie (Germany)
W. M. Keck Observatory (United States)
Univ. of California, Los Angeles (United States)
J. Woillez, Max-Planck-Institut für Astronomie (Germany)
S. Ragland, Max-Planck-Institut für Astronomie (Germany)
P. L. Wizinowich, Max-Planck-Institut für Astronomie (Germany)
J. A. Eisner, Steward Observatory, The Univ. of Arizona (United States)
J. D. Monnier, Univ. of Michigan (United States)
R. L. Akeson, NASA Exoplanet Science Institute (United States)
A. M. Ghez, Univ. of California, Los Angeles (United States)
J. R. Graham, Univ. of California, Berkeley (United States)
L. A. Hillenbrand, NASA Exoplanet Science Institute (United States)
R. Millan-Gabet, NASA Exoplanet Science Institute (United States)
E. Appleby, Max-Planck-Institut für Astronomie (Germany)
B. Berkey, Max-Planck-Institut für Astronomie (Germany)
M. M. Colavita, Jet Propulsion Lab. (United States)
A. Cooper, Max-Planck-Institut für Astronomie (Germany)
C. Felizardo, NASA Exoplanet Science Institute (United States)
J. Herstein, NASA Exoplanet Science Institute (United States)
M. Hrynevych, Max-Planck-Institut für Astronomie (Germany)
D. Medeiros, Max-Planck-Institut für Astronomie (Germany)
D. Morrison, Max-Planck-Institut für Astronomie (Germany)
T. Panteleeva, Max-Planck-Institut für Astronomie (Germany)
B. Smith, Max-Planck-Institut für Astronomie (Germany)
K. Summers, Max-Planck-Institut für Astronomie (Germany)
K. Tsubota, Max-Planck-Institut für Astronomie (Germany)
C. Tyau, Max-Planck-Institut für Astronomie (Germany)
E. Wetherell, Max-Planck-Institut für Astronomie (Germany)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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