ALMA 1.3 Millimeter Map of the HD 95086 System

Abstract

Planets and minor bodies such as asteroids, Kuiper-belt objects and comets are integral components of a planetary system. Interactions among them leave clues about the formation process of a planetary system. The signature of such interactions is most prominent through observations of its debris disk at millimeter wavelengths where emission is dominated by the population of large grains that stay close to their parent bodies. Here we present ALMA 1.3 mm observations of HD 95086, a young early-type star that hosts a directly imaged giant planet b and a massive debris disk with both asteroid- and Kuiper-belt analogs. The location of the Kuiper-belt analog is resolved for the first time. The system can be depicted as a broad ($\Delta R/R\sim$0.84), inclined (30\arcdeg$\pm$3\arcdeg) ring with millimeter emission peaked at 200$\pm$6 au from the star. The 1.3 mm disk emission is consistent with a broad disk with sharp boundaries from 106$\pm$6 to 320$\pm$20 au with a surface density distribution described by a power law with an index of --0.5$\pm$0.2. Our deep ALMA map also reveals a bright source located near the edge of the ring, whose brightness at 1.3 mm and potential spectral energy distribution are consistent with it being a luminous star-forming galaxy at high redshift. We set constraints on the orbital properties of planet b assuming co-planarity with the observed disk.

accepted for publication in AJ

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• Insights into the planetary dynamics of HD 206893 with ALMA
• High resolution ALMA and HST images of q${}^1$ Eri: an asymmetric debris disc with an eccentric Jupiter
• The Age of the Carina Young Association and Potential Membership of HD 95086
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Primordial or Secondary? Testing models of debris disk gas with ALMA
• Upper limits on protolunar disc masses using ALMA observations of directly-imaged exoplanets
• Chemical analysis of early-type stars with planets
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) II. The radial structure of debris discs
• In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
• Relating grain size distributions in circumstellar discs to the spectral index at millimetre wavelengths
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Resolving the outer ring of HD 38206 using ALMA and constraining limits on planets in the system
• The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars
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• Narrow belt of debris around the Sco-Cen star HD 141011
• Multi-wavelength, spatially resolved modelling of HD 48682's debris disc
• New constraints on the presence of debris disks around G 196-3 B and VHS J125601.92-125723.9 b
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• HD 44892: The youngest (or oldest?) gas-harbouring debris disc around an intermediate mass star