Debris Distribution in HD 95086—A Young Analog of HR 8799

Su Kate, Y. L. and Morrison, Sarah and Malhotra, Renu and Smith, Paul S. and Balog, Zoltán (2015) Debris Distribution in HD 95086—A Young Analog of HR 8799. ASTROPHYSICAL JOURNAL, 799 (2). ISSN 1538-4357

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Abstract

HD 95086 is a young early-type star that hosts (1) a 5 MJ planet at the projected distance of56 AU revealed by direct imaging, and (2) a prominent debris disk. Here we report the detectionof 69 μm crystalline olivine feature from the disk using the Spitzer/MIPS-SED data covering 55–95μm. Due to the low resolution of MIPS-SED mode, this feature is not spectrally resolved, but isconsistent with the emission from crystalline forsterite contributing ∼5% of the total dust mass. Wealso present detailed analysis of the disk SED and re-analysis of resolved images obtained by Herschel.Our results suggest that the debris structure around HD 95086 consists of a warm (∼175 K) belt, acold (∼55 K) disk, and an extended disk halo (up to ∼800 AU), and is very similar to that of HR 8799.We compare the properties of the three debris components, and suggest that HD 95086 is a younganalog of HR 8799. We further investigate and constrain single-planet, two-planet, three-planet andfour-planet architectures that can account for the observed debris structure and are compatible withdynamical stability constraints. We find that equal-mass four-planet configurations of geometricallyspaced orbits, with each planet of mass ∼5 MJ , could maintain the gap between the warm and colddebris belts, and also be just marginally stable for timescales comparable to the age of the system.Subject headings: circumstellar matter – infrared: stars, planetary systems – stars: individual (HD95086)

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