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Jean Chiar
Senior Research Scientist; Director of SETI Institute's REU program
Institution:
SETI Institute
Summary
Published articles Show More
Observational constraints on methanol production in interstellar and preplanetary ices
Published in The Astrophysical Journal
Methanol (CH 3 OH) is thought to be an important link in the chain of chemical evolution that leads from simple diatomic interstellar molecules to complex organic species in protoplanetary disks that may be delivered to the surfaces of Earthlike planets. Previous research has shown that CH 3 OH forms in the interstellar medium predominantly on the ...
Ices in the quiescent IC 5146 dense cloud
...Published in The Astrophysical Journal
This paper presents spectra in the 2 to 20 μm range of quiescent cloud material located in the IC 5146 cloud complex. The spectra were obtained with NASA s Infrared Telescope Facility SpeX instrument and the Spitzer Space Telescope s Infrared Spectrometer. We use these spectra to investigate dust and ice absorption features in pristine regions of t...
The thermal evolution of ices in the environments of newly formed stars: The CO2 diagnostic
Published in The Astrophysical Journal
Archival data from the Infrared Spectrometer of the Spitzer Space Telescope are used to study the 15 μm absorption feature of solid CO 2 toward 28 young stellar objects (YSOs) of approximately solar mass. Fits to the absorption profile using laboratory spectra enable categorization according to the degree of thermal processing of the ice matrix tha...
Misc. Show More
A Direct Measurement of the CO Depletion in the Elias 18 Circumstellar Disk Astrophysical Journal Letters 547
Circumstellar Carbonaceous Material Associated with Late-Type Dusty WC Wolf-Rayet Stars Astrophysical Journal Letters 55...
A Direct Measurement of the CO Depletion in the Elias 18 Circumstellar Disk The Astrophysical Journal Letters
