Characterizing the Inner Disk of SY CHA with JWST MIRI

Kamber R. Schwarz, Giulia Perotti, Sierra L. Grant, Matthias Samland, Valentine Christiaens, Benoit Tabone, Aditya Arabhavi, Thomas Henning, Inga Kamp, Ewine F. van Dishoeck, Danny Gasman, Alain Abergel, Olivier Absil, Ioannis Argyriou, David Barrado, Anthony Boccaletti, Jeroen Bouwman, Alessio Caratti o Garatti, Vincent Geers, Adrian Glauser, Manuel Gudel, Rodrigo Guadarrama, Hyerin Jang, Jayatee Kanwar, Pierre-Oliver Lagage, Fred Lahuis, Maria Morales-Calderon, Michael Mueller, Cyrine Nehme, Goran Olofsson, Eric Pantin, Nicole Pawellek, Tom Ray, Silvia Scheithauer, Jurgen Schreiber, Milo Temmink, Bart Vandenbussche, Marissa Vlasblom, Christoffel Waelkens, L.B.F.M. Waters, Gillian Wright

SY Cha is a transition disk with an inner dust cavity of ~53 au in the millimeter continuum. Analysis of the SED and past observations with Spitzer provide evidence for an additional hot inner disk component. If the dust cavity is formed by a pressure trap, the inner disk should have a different chemical composition compared to disks without large gaps. Here we present MIRI-MRS observations of SY Cha taken as part of the MIRI mid-INfrared Disk Survey (MINDS) GTO program. We identify emission lines from multiple gas species, including H2O, CO2, CO, and C2H2. We use radiative transfer modeling to characterize the temperature, abundance, and emitting area of these species.