Joseph Roser

Dr. Joseph Roser (SETI Institute) is an experimental molecular physicist with extensive experience in laboratory astrophysics using spectroscopic and surface science experimental techniques. Dr. Roser is actively conducting experimental research with the Astrochemistry Laboratory at NASA-Ames Research Center. His current and past research projects include:

• Infrared complex index of refraction measurements of ammonia ice and ammonia/water ice mixtures
• Infrared spectroscopy of polycyclic aromatic hydrocarbon clusters using the matrix isolation technique
• Investigating the formation of carbon dioxide from carbon monoxide reacting with oxygen atoms within a water ice matrix
• Measuring atomic hydrogen recombination rates on surfaces of interstellar dust grain analogues

Dr. Roser is also the lead author of the Planetary Science and Astrobiology Decadal Survey white paper titled “Optical Constants of Outer Solar System Materials and Radiative Transfer Modeling.”

Recent Peer-Reviewed Publications:

• Cartwright, R. J., Beddingfield, C. B., Nordheim, T. A., Roser, J., Grundy, W. M., Hand, K. P., Emery, J. P., Cruikshank, D. P., & Scipioni, F. 2020, “Evidence for Ammonia-bearing Species on the Uranian Satellite Ariel Supports Recent Geologic Activity,” ApJL, 898, L22
   
• Ricca, A., Roser, J. E., Peeters, E., & Boersma, C. 2019, “Polycyclic Aromatic Hydrocarbons with armchair edges: Potential emitters in class B sources,” ApJ, 882, 56
   
• Ricca, A., Bauschlicher, C. W., Jr., Roser, J. E., & Peeters, E. 2017, “Polycyclic Aromatic Hydrocarbons with Straight Edges and the 7.6/6.2 and 8.6/6.2 Intensity Ratios in Reflection Nebulae,” ApJ, 854, 115
   
• Roser, J. E. & Ricca, A. 2015, “Polycyclic Aromatic Hydrocarbon Clusters as Sources of Interstellar Infrared Emission,” ApJ, 801, 108
   
• Cook, A. M., Ricca, A., Mattioda, A. L., Bouwman, J., Roser, J., Linnartz, H., Bregman, J., & Allamandola, L. J. 2015, “Phtochemistry of Polycyclic Aromatic Hydrocarbons in Cosmic Water Ice: The Role of PAH Ionization and Concentration,” ApJ, 799, 14
   
• Roser, J. E., Ricca, A., & Allamandola, L. J. 2014, “Anthracene Clusters and the Interstellar Infrared Emission Features,” ApJ, 783, 97
   
• Roser, J. E., & Allamandola, L. J. 2010, “Infrared Spectroscopy of Naphthalene Aggregation and Cluster Formation in Argon Matrices,” ApJ, 722, 1932

Science Collaborations:

• The JWST Early Release Science project “Radiative Feedback from Massive Stars as Traced by Multiband Imaging and Spectroscopic Mosaics.”
• The NASA ISFM directed work package “Laboratory Astrophysics – The NASA Ames PAH IR Spectroscopic Database.”