MINDS. Cha H{\alpha} 1, a brown dwarf with a hydrocarbon-rich disk
Mar\'ia Morales-Calder\'on, Hyerin Jang, Aditya M. Arabhavi, Valentin Christiaens, David Barrado, Inga Kamp, Ewine F. van Dishoeck, Thomas Henning, L. B. F. M. Waters, Milou Temmink, Manuel G\"udel, Pierre-Olivier Lagage, Alessio Caratti o Garatti, Adrian M. Glauser, Tom P. Ray

TL;DR
This study uses JWST data to analyze the complex gas and dust chemistry of the brown dwarf Cha Hα 1's disk, revealing diverse hydrocarbons and silicate features that inform planet formation theories.
Contribution
First detailed mid-infrared spectral analysis of a brown dwarf disk showing rich hydrocarbon and silicate chemistry with implications for planet formation.
Findings
Detection of diverse hydrocarbons including C2H2, CH4, and benzene.
Presence of large amorphous silicate grains (~4 μm).
Most chemically rich brown dwarf disk observed to date.
Abstract
Context. Recent JWST observations have shown that brown dwarfs (BD) are chemically rich, offering valuable insights into giant planet formation. Aims. As part of the MIRI mid-INfrared Disk Survey (MINDS) JWST guaranteed time program, we aim to characterize the gas and dust composition of the disk around the brown dwarf [NC98] Cha HA 1, hereafter Cha H 1, in the mid-infrared. Methods. We obtain data from the MIRI Medium Resolution Spectrometer (MRS) from 4.9 to 28m. We use the dust fitting tool DuCK to investigate the dust composition and grain sizes while we identify and fit molecular emission using slab models. Results. Compared with disks around very low mass stars, clear silicate emission features are seen in this BD disk. In addition, JWST reveals a plethora of hydrocarbons, including CH, CCH, CH, CH, CH, CH, CH,…
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