Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
Mark Booth, Grant Kennedy, Bruce Sibthorpe, Brenda C. Matthews, Mark, C. Wyatt, Gaspard Duch\^ene, J. J. Kavelaars, David Rodriguez, Jane S., Greaves, Alice Koning, Laura Vican, George H. Rieke, Kate Y. L. Su, Amaya, Moro-Mart\'in, Paul Kalas

TL;DR
This study uses Herschel's high-resolution imaging to resolve debris discs around A stars, directly measuring dust locations and improving radius estimates over traditional unresolved photometry methods.
Contribution
First resolved imaging of debris discs around A stars in the Herschel DEBRIS survey, providing insights into disc structure and improved radius estimation techniques.
Findings
Resolved discs have radii 1 to 2.5 times larger than blackbody estimates.
Disc radii inversely correlate with stellar luminosity.
Discs show diverse structures, including narrow, wide, or multiple rings.
Abstract
The majority of debris discs discovered so far have only been detected through infrared excess emission above stellar photospheres. While disc properties can be inferred from unresolved photometry alone under various assumptions for the physical properties of dust grains, there is a degeneracy between disc radius and dust temperature that depends on the grain size distribution and optical properties. By resolving the disc we can measure the actual location of the dust. The launch of Herschel, with an angular resolution superior to previous far-infrared telescopes, allows us to spatially resolve more discs and locate the dust directly. Here we present the nine resolved discs around A stars between 20 and 40 pc observed by the DEBRIS survey. We use these data to investigate the disc radii by fitting narrow ring models to images at 70, 100 and 160 {\mu}m and by fitting blackbodies to full…
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