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Published January 10, 2015 | Published + Submitted
Journal Article Open

ALMA Observations of the Debris Disk around the Young Solar Analog HD 107146


We present the Atacama Large Millimeter/submillimeter Array (ALMA) continuum observations at a wavelength of 1.25 mm of the debris disk surrounding the ~100 Myr old solar analog HD 107146. The continuum emission extends from about 30 to 150 AU from the central star with a decrease in the surface brightness at intermediate radii. We analyze the ALMA interferometric visibilities using debris disk models with radial profiles for the dust surface density parameterized as (1) a single power law, (2) a single power law with a gap, and (3) a double power law. We find that models with a gap of radial width ~8 AU at a distance of ~80 AU from the central star, as well as double power-law models with a dip in the dust surface density at ~70 AU provide significantly better fits to the ALMA data than single power-law models. We discuss possible scenarios for the origin of the HD 107146 debris disk using models of planetesimal belts in which the formation of Pluto-sized objects trigger disruptive collisions of large bodies, as well as models that consider the interaction of a planetary system with a planetesimal belt and spatial variation of the dust opacity across the disk. If future observations with higher angular resolution and sensitivity confirm the fully depleted gap structure discussed here, a planet with a mass of approximately a few Earth masses in a nearly circular orbit at ~80 AU from the central star would be a possible explanation for the presence of the gap.

Additional Information

© 2015 American Astronomical Society. Received 13 August 2014. Published 8 January 2015. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00470.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. J.M.C. acknowledges support from NSF grant AST-1109334. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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Published - 0004-637X_798_2_124.pdf

Submitted - 1410.8265v1.pdf


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