Laura Ketzer committed May 07, 2020 1 # PLATYPOS - PLAneTarY PhOtoevaporation Simulator  Laura Ketzer committed Jun 19, 2020 2 Tool to estimate the atmospheric mass loss of planets induced by the stellar X-ray and extreme UV irradiance.  Laura Ketzer committed May 07, 2020 3   Laura Ketzer committed May 07, 2020 4   Laura Ketzer committed Jun 19, 2020 5 ![](./supplementary_files/V1298Tau_press_release.png)  Laura Ketzer committed Jun 19, 2020 6 7   Laura Ketzer committed Jun 19, 2020 8 9 ## Our Model Assumptions We do not make use of full-blown hydrodynamical simulations, but instead couple existing parametrizations of planetary mass-radius relations with an energy-limited hydrodynamic escape model to estimate the mass-loss rate over time.  Laura Ketzer committed May 07, 2020 10   Laura Ketzer committed Jun 19, 2020 11 12 ### Mass-loss description:
 Laura Ketzer committed May 07, 2020 13   Laura Ketzer committed Jun 19, 2020 14 15 16 17 18 19 20 21 22 23 24 25 26 27 where is the flux impinging on the planet, and are the planetary radii at optical and XUV wavelengths, respectively ( ). is the mass and the density of the planet, is the efficiency of the atmospheric escape with a value between 0 and 1, and K is a factor representing the impact of Roche lobe overflow (Erkaev et al., 2007), which can take on values of 1 for no Roche lobe influence and <1 for planets filling significant fractions of their Roche lobes.  Laura Ketzer committed May 07, 2020 28   Laura Ketzer committed Jun 19, 2020 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46  ### Planet Model description:
To be implemented... ## Repository Structure: * **platypos_package**: contains the planet classes & all the necessary funtions to construct a planet and make it evolve  Laura Ketzer committed Jun 19, 2020 47  (LoF014 planet with rocky core & gaseous envelope OR planet based on mass-radius relation for mature planets (Ot20))  Laura Ketzer committed Jun 19, 2020 48 49 50 51 52 53  * **supplementary_files**: contains some extra files for plotting (Tu et al., 2015 model tracks for the X-ray luminosity evolution, Jackson et al., 2012 sample of X-ray measurements in young clusters) * **example_V1298Tau**: evolve the four young V1298 Tau planets as shown in "X-ray irradiation and evaporation of the four young planets around V1298 Tau" (Poppenhaeger, Ketzer, Mallon 2020)  Laura Ketzer committed Jun 19, 2020 54  [Link to our paper: ](https://arxiv.org/abs/2005.10240)  Laura Ketzer committed Jun 19, 2020 55 56  * **population_evolution**: evolve a whole population of planets (to be fully implemented in the future)