Volume 653, September 2021
|Number of page(s)||11|
|Section||Letters to the Editor|
|Published online||02 September 2021|
Letter to the Editor
Composition of organics on asteroid (101955) Bennu
NASA Goddard Space Flight Center, Greenbelt, MD, USA
2 Southwest Research Institute, Boulder, CO, USA
3 Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USA
4 NASA Ames Research Center, Moffett Field, CA, USA
5 LESIA, Observatoire de Paris, Université PSL, CNRS, Université de Paris, Sorbonne Université, 5 Place Jules Janssen, 92195 Meudon, France
6 Department of Geography, University of Winnipeg, Winnipeg, Canada
7 INAF-Arcetri Astrophysical Observatory, Florence, Italy
8 Department of Physics, Ithaca College, Ithaca, NY, USA
9 Department of Physics, University of Central Florida, Orlando, Florida, USA
10 Northern Arizona University, Flagstaff, AZ, USA
11 Institut Universitaire de France (IUF), Paris, France
12 Planetary Science Institute, Tucson, AZ, USA
13 Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
Accepted: 30 July 2021
Context. The Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission detected an infrared absorption at 3.4 μm on near-Earth asteroid (101955) Bennu. This absorption is indicative of carbon species, including organics, on the surface.
Aims. We aim to describe the composition of the organic matter on Bennu by investigating the spectral features in detail.
Methods. We use a curated set of spectra acquired by the OSIRIS-REx Visible and InfraRed Spectrometer that have features near 3.4 μm (3.2 to 3.6 μm) attributed to organics. We assess the shapes and strengths of these absorptions in the context of laboratory spectra of extraterrestrial organics and analogs.
Results. We find spectral evidence of aromatic and aliphatic CH bonds. The absorptions are broadly consistent in shape and depth with those associated with insoluble organic matter in meteorites. Given the thermal and space weathering environments on Bennu, it is likely that the organics have not been exposed for long enough to substantially decrease the H/C and destroy all aliphatic molecules.
Key words: minor planets, asteroids: individual: (101955) Bennu / techniques: spectroscopic / planets and satellites: composition
© H. H. Kaplan et al. 2021
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.