Resolving Structure in the Debris Disk around HD 206893 with ALMA

Live Poster Session: Zoom Link
Thursday, July 30th 1:15-2:30pm EDT

Ava Nederlander

Ava Nederlander is a rising junior (‘22) from New York City. She is a CIS major in Computer Science and Astronomy with a minor in IDEAS/Digital Design. Ava is a member of WesMaSS and WesWIS. She is also a Photo Editor for The Wesleyan Argus and serves as a co-director of the dance group Collective Motion. Ava was a research intern at the American Museum of Natural History. After Wesleyan, Ava plans to go to graduate school.

Abstract: Debris disks are tenuous, dusty belts surrounding main sequence stars generated by collisions between planetesimals. HD 206893 is one of only two stars known to host a directly imaged brown dwarf orbiting interior to its debris ring, in this case at a projected separation of 10.4 au. A brown dwarf is an object between 15 and 75 times the mass of Jupiter. I resolve the structure in the debris disk around HD 206893 at an angular resolution of 24 pc and wavelength of 1.3mm with the Atacama Large Millimeter/submillimeter Array (ALMA). I observe a broad disk using parametric MCMC models to fit the structure of the disk and find strong evidence for a gap in the disk, suggestive of an additional planetary-mass companion. The inner edge of the debris disk is only marginally resolved, yielding a constraint on the mass of the directly imaged companion.

Ava_Summer_Poster2020-Ava-Nederlander

Live Poster Session: Zoom Link
Thursday, July 30th 1:15-2:30pm EDT

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