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

Abstract

HD 95086 is a young early-type star that hosts (1) a 5 MJ planet at the projected distance of 56 AU revealed by direct imaging, and (2) a prominent debris disk. Here we report the detection of 69 um crystalline olivine feature from the disk using the Spitzer/MIPS-SED data covering 55-95 um. Due to the low resolution of MIPS-SED mode, this feature is not spectrally resolved, but is consistent with the emission from crystalline forsterite contributing 5% of the total dust mass. We also 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, a cold (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 young analog of HR 8799. We further investigate and constrain single-planet, two-planet, three-planet and four-planet architectures that can account for the observed debris structure and are compatible with dynamical stability constraints. We find that equal-mass four-planet configurations of geometrically spaced orbits, with each planet of mass 5 MJ, could maintain the gap between the warm and cold debris belts, and also be just marginally stable for timescales comparable to the age of the system.

accepted for publication in ApJ

References in corpus (14)

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• Long-term stability of the HR 8799 planetary system without resonant lock
• Herschel Observations of Dusty Debris Disks
• Clearing residual planetesimals by sweeping secular resonances in transitional disks: a lone-planet scenario for the wide gaps in debris disks around Vega and Fomalhaut
• Mid-infrared Studies of HD 113766 and HD 172555: Assessing Variability in the Terrestrial Zone of Young Exoplanetary Systems
• The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- IV. Aperture Masking Interferometry
• Shaping HR8799's outer dust belt with an unseen planet
• In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
• Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks
• Limits on the presence of planets in systems with debris disks: HD 92945 and HD 107146
• Seeking echoes of circumstellar disks in Kepler light curves
• VLT/SPHERE survey for exoplanets around young, early-type stars including systems with multi-belt architectures
• A WISE View of IRAS Debris Disks: Revising the Dust Properties
• Constraints on HD113337 fundamental parameters and planetary system. Combining long-base visible interferometry, disk imaging and high-contrast imaging