Numerical modeling of impact survival and atmospheric escape shows Mars ejecta smaller than 0.03 m rarely deliver viable microbes to Phobos orbit due to drag and heating.
Strength parameters are taken from the work for basalt (Ivanov et al., 2010)
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Assessment of the probability of microbial contamination for sample return from Martian moons I: Departure of microbes from Martian surface
Numerical modeling of impact survival and atmospheric escape shows Mars ejecta smaller than 0.03 m rarely deliver viable microbes to Phobos orbit due to drag and heating.