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Models of the η Corvi Debris Disk from the Keck Interferometer, Spitzer, and Herschel

Lebreton, J. and Beichman, C. and Bryden, G. and Defrère, D. and Mennesson, B. and Millan-Gabet, R. and Boccaletti, A. (2016) Models of the η Corvi Debris Disk from the Keck Interferometer, Spitzer, and Herschel. Astrophysical Journal, 817 (2). Art. No. 165. ISSN 0004-637X.

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Debris disks are signposts of analogs to small-body populations of the solar system, often, however, with much higher masses and dust production rates. The disk associated with the nearby star η Crv is especially striking, as it shows strong mid- and far-infrared excesses despite an age of ~1.4 Gyr. We undertake constructing a consistent model of the system that can explain a diverse collection of spatial and spectral data. We analyze Keck Interferometer Nuller measurements and revisit Spitzer and additional spectrophotometric data, as well as resolved Herschel images, to determine the dust spatial distribution in the inner exozodi and in the outer belt. We model in detail the two-component disk and the dust properties from the sub-AU scale to the outermost regions by fitting simultaneously all measurements against a large parameter space. The properties of the cold belt are consistent with a collisional cascade in a reservoir of ice-free planetesimals at 133 AU. It shows marginal evidence for asymmetries along the major axis. KIN enables us to establish that the warm dust consists of a ring that peaks between 0.2 and 0.8 AU. To reconcile this location with the ~400 K dust temperature, very high albedo dust must be invoked, and a distribution of forsterite grains starting from micron sizes satisfies this criterion, while providing an excellent fit to the spectrum. We discuss additional constraints from the LBTI and near-infrared spectra, and we present predictions of what James Webb Space Telescope can unveil about this unusual object and whether it can detect unseen planets.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Lebreton, J.0000-0003-1476-5963
Beichman, C.0000-0002-5627-5471
Defrère, D.0000-0003-3499-2506
Mennesson, B.0000-0003-4205-4800
Millan-Gabet, R.0000-0003-0447-5866
Boccaletti, A.0000-0001-9353-2724
Alternate Title:Models of the Eta Corvi debris disk from the Keck Interferometer, Spitzer and Herschel
Additional Information:© 2016 American Astronomical Society. Received 2014 December 10; accepted 2015 November 9; published 2016 January 29. We thank Kate Su, who provided the MIPS-SED data. We are grateful to Grant Kennedy and Gaspard Duchêne for their comments on IRS spectrum and photosphere models and to Casey Lisse for his insights on dust properties and models. We also thank Dimitra Touli for her help with the data analysis. Finally, we acknowledge Jean-Charles Augereau and Olivier Absil, who are the original developpers of the GRaTer code and the KIN simulator, respectively. This paper was based on observations taken with the Spitzer Space Telescope and the Keck Interferometer Nuller, both funded by NASA. Herschel Space Observatory is an ESA space observatory with important participation from NASA. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:circumstellar matter; infrared: planetary systems; planetary systems; stars: individual (Corvi, HD 109085) ; zodiacal dust
Issue or Number:2
Record Number:CaltechAUTHORS:20160316-063550427
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Official Citation:J. Lebreton et al 2016 ApJ 817 165
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65378
Deposited By: Ruth Sustaita
Deposited On:16 Mar 2016 16:11
Last Modified:09 Mar 2020 13:18

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