PI: Alexandra Greenbaum, Johns Hopkins U., email@example.com
Address: Department of Physics and Astronomy, Charles and 34th Street, Bloomberg Center, Baltimore, MD, 21218 USA
CoI: Katherine Follette, Stanford U.
CoI: Peter Tuthill, U. of Sydney
CoI: Anand Sivaramakrishnan, STScI
CoI: Laurent Pueyo, STScI
CoI: Fredrik Rantakyro, Gemini Observatory
CoI: Julien Rameau, University of Montreal
CoI: Pascale Hibon, Gemini Observatory
CoI: Adam Burrows, Princeton U.
CoI: Gaspard Duchene, UC Berkeley
CoI: Jeffrey Chilcote, University of Toronto
Title: Probing the inner regions of HD142527 and HD100546
Abstract: The critical inner 2-10 AU of many planet forming systems lies obscured beneath the coronagraphic occulter on extreme-AO sytstems like the Gemini Planet Imager. To probe these otherwise-inaccessible regions, we propose to use GPI's non-redundant mask (NRM) to characterize or detect companions in the inner regions of HD142527 and HD100546 spectroscopically and map disk structure close in with polarimetry. This study aims to provide evidence for accretion onto low mass companions within the circumstellar disk. Studying transitional disk systems, which have a cleared gap and possible massive bodies responsible for clearing it, provide a laboratory for testing giant planet and disk evolution mechanisms. We will detect and characterize the known transitional disk companion HD142527B in J and K1 bands to contrain its mass and accretion properties. Our observations will provide an additional astrometric point at high precision for constraining its orbit. We will detect substellar companions or rule out masses > ~45 Mj in the gap of HD100546, which is a strong candidate for hosting a companion close in. We will be able to detect a polarized signal of a few % from scattered light by inner disks in both systems on AU scales. These observations will allow us to study the interaction between transitional disk companions and disks on the angular scales of planet formation, putting wider coronagraphic studies in context.
Program Type: Standard/Galactic
Run 1 (2016A): GEM-SQ/GPI -- 4.5hrs band 1 (GS-2016A-Q-30)
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360