Multi-epoch observations of HD 69830: high-resolution spectroscopy and limits to variability

Beichman, C. A. and Lisse, C. M. and Tanner, A. M. and Bryden, G. and Akeson, R. L. and Ciardi, D. R. and Boden, A. F. and Dodson-Robinson, S. E. and Salyk, C. and Wyatt, M. C. (2011) Multi-epoch observations of HD 69830: high-resolution spectroscopy and limits to variability. The Astrophysical Journal, 743 (1). pp. 85-100. ISSN 0004-637X

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Abstract

The main-sequence solar-type star HD 69830 has an unusually large amount of dusty debris orbiting close to three planets found via the radial velocity technique. In order to explore the dynamical interaction between the dust and planets, we have performed multi-epoch photometry and spectroscopy of the system over several orbits of the outer dust. We find no evidence for changes in either the dust amount or its composition, with upper limits of 5%-7% (1σ per spectral element) on the variability of the dust spectrum over 1year, 3.3% (1σ) on the broadband disk emission over 4years, and 33% (1σ) on the broadband disk emission over 24years. Detailed modeling of the spectrum of the emitting dust indicates that the dust is located outside of the orbits of the three planets and has a composition similar to main-belt, C-type asteroids in our solar system. Additionally, we find no evidence for a wide variety of gas species associated with the dust. Our new higher signal-to-noise spectra do not confirm our previously claimed detection of H2O ice leading to a firm conclusion that the debris can be associated with the break-up of one or more C-type asteroids formed in the dry, inner regions of the protoplanetary disk of the HD 69830 system. The modeling of the spectral energy distribution and high spatial resolution observations in the mid-infrared are consistent with a ∼1AU location for the emitting material.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 05 Jun 2017 23:04
Last Modified: 27 Jun 2017 02:47
Uncontrolled Keywords: infrared: planetary systems; Kuiper belt: general; planet-disk interactions; planets and satellites: dynamical evolution and stability; individual stars (HD 69830); zodiacal dust;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/743/1/85
URI: http://eprints.usq.edu.au/id/eprint/32154

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