Spitzer Observations and Dynamical Modeling of Two Multi-planet Systems with Dust
First Author:
Moro-Martin Amaya
Email: amaya AT astro.princeton.edu
CAB-CSIC and Princeton University
Centro de Astrobiología (CSIC/INTA), Instituto Nacional de Técnica Aeroespacial, Ctra de Torrejón a Ajalvir, km 4
28850 Torrejón de Ardoz, Madrid, Spain
Coauthors:
Malhotra, R., University of Arizona
Carpenter, J. M., Caltech
Hillenbrand, L.A., Caltech
Wolf, S., Christian-Albrechts-Universitaet zu Kiel
Meyer, M.R., University of Arizona
Hollenbach, D., NASA Ames
Najita, J., NOAO
Henning, T., MPIA
Bryden, G., JPL
Beichman, C., Michelson Science Center - Caltech
Lawler, S., JPL
Abstract
In the search for Solar system analogs, the study of planetary systems with multiple planets and dust emission is of critical importance. Only five of these systems have been identified so far: HD69830, HD10647, HD 82943, HD38529 and HD128311. Here we summarize the study of the later two. Spitzer/MIPS observations show spatially unresolved excess emission above the stellar photosphere at 70 μm with S/N = 4.7 (HD38529) and ~4 (HD128311). No dust excess is detected at shorter wavelengths. We discuss the distribution of the potential dust-producing planetesimals from the study of the dynamical perturbations of the two known planets, considering in particular the effect of secular resonances, and from the modeling of the spectral energy distributions. We find that the configuration might resemble that of the Jovian planets + Kuiper Belt in our Solar System.
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