Stellar radiation and its influence over the biosphere of planetary bodies

• Grant number: 12/20106-5
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: April 01, 2013
• End date: July 31, 2014
• Field of knowledge: Physical Sciences and Mathematics - Astronomy
• Principal Investigator: Jorge Ernesto Horvath
• Grantee: Ximena Celeste Abrevaya
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The main objective of this plan is to model extraterrestrial environments, taking into account radiation as a factor influencing the origin, evolution and development of life inside or outside the Solar System. This plan involves both theoretical and experimental work. The first part involves theoretical modeling of the potential effects of radiation over the biosphere of terrestrial (primitive Earth, Mars, Europa) or extraterrestrial environments (extrasolar planets) subjected to radiation from different stellar objects (the young Sun and solar stellar analogs and F, K and M stars, respectively).The second part involves experimental work to test the predictions made by the models. These laboratory experiments will be carried out using different radiotolerant or radioresistant microorganisms from different domains of life such as halophilic archaea, cyanobacteria and the radioresistant bacteria Deinococcus radiodurans. The irradiation experiments will be performed using different sources of UV and X-ray radiation. The results of the experimental section will provide more knowledge about the capacity of life to survive in simulated environments. Also, they will provide some important clues about the origin of life on Earth and on other planetary bodies of our Solar System. Conversely, they could be used as input to adjust the models, thus enhancing their accuracy.This work will provide new information related to the origin and evolution of life on Earth and the possibility of existence of life on other planetary bodies, which is of vital importance for the astrobiological community.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ABREVAYA, XIMENA C.; GALANTE, DOUGLAS; TRIBELLI, PAULA M.; OPPEZZO, OSCAR J.; NOBREGA, FELIPE; ARAUJO, GABRIEL G.; RODRIGUES, FABIO; ODERT, PETRA; LEITZINGER, MARTIN; RICARDI, MARTINIANO M.; et al. Protective Effects of Halite to Vacuum and Vacuum-Ultraviolet Radiation: A Potential Scenario During a Young Sun Superflare. ASTROBIOLOGY, v. 23, n. 3, p. 24-pg., 2022-12-27. (12/20106-5)