Caveats to Exogenous Organic Delivery from Ablation, Dilution, and Thermal Degradation
Abstract
:1. Introduction
1.1. Prior Work
1.2. Meteor Energy Loss Due to Ablation
1.3. Thermal Diffusion and Meteor Ablation
1.4. Meteoroid Source Region and Distributions on Impact
2. Methods
2.1. Ablation Model
2.2. Strewn Field Analysis
2.3. Thermal Diffusion and Chemical Kinetics Model
3. Results
3.1. Strewn Field Mass-Area Relationship
3.2. Radiation Model Results
4. Discussion
4.1. Caveats for Delivery
4.2. Comparison to Natural Samples
4.3. Calculation of Exogenous Material Delivery to the Early Earth
5. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Mass (kg) | kg/year | Intervals between Years |
---|---|---|
0.10 | 110,000.00 | 0.00001 |
0.50 | 52,000.00 | 0.00002 |
1.00 | 37,000.00 | 0.00003 |
5.00 | 12,000.00 | 0.00008 |
100.00 | 800.00 | 0.00130 |
500.00 | 170.00 | 0.01 |
1000.00 | 91.00 | 0.01 |
5000.00 | 21.00 | 0.05 |
10,000.00 | 11.00 | 0.09 |
50,000.00 | 2.40 | 0.42 |
100,000.00 | 1.30 | 0.77 |
500,000.00 | 0.29 | 3.46 |
1,000,000.00 | 0.15 | 6.58 |
5,000,000.00 | 0.02 | 41.32 |
Parameter | Symbol | Value |
---|---|---|
Atmosphere Surface Density | ρatm,Present day | 40.1 moles/m3 |
Scale Height Present Day | H | 7 km |
Thin N2 Atmosphere Surface Density | ρatm,N2 | 20 moles/m3 |
Scale Height | hN2 | 7.5 km |
Thick CO2 Atmosphere Surface Density | ρatm,C02 | 120 moles/m3 |
Scale Height | hCO2 | 5 km |
Starting Altitude | Z | 200,000 km |
Drag Coefficient | cd | 0.47 |
Angle of Entry | θ | 45° |
Density | ρ | 3.5 g/cc |
Ablation Coefficient | ca | 0.014 |
Ch/2Q | N/A | 6.25 × 10−9 s2/m2 |
Initial Velocity (m/s) | Minimum Initial Mass (kg) |
---|---|
10,000 | 0.05 |
14,000 | 0.1 |
18,000 | 0.2 |
22,000 | 0.72 |
26,000 | 2.64 |
30,000 | 13.5 |
34,000 | 132 |
38,000 | 13,000 |
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Mehta, C.; Perez, A.; Thompson, G.; Pasek, M.A. Caveats to Exogenous Organic Delivery from Ablation, Dilution, and Thermal Degradation. Life 2018, 8, 13. https://doi.org/10.3390/life8020013
Mehta C, Perez A, Thompson G, Pasek MA. Caveats to Exogenous Organic Delivery from Ablation, Dilution, and Thermal Degradation. Life. 2018; 8(2):13. https://doi.org/10.3390/life8020013
Chicago/Turabian StyleMehta, Chris, Anthony Perez, Glenn Thompson, and Matthew A. Pasek. 2018. "Caveats to Exogenous Organic Delivery from Ablation, Dilution, and Thermal Degradation" Life 8, no. 2: 13. https://doi.org/10.3390/life8020013