Dust entrainment in photoevaporative winds: The impact of Xrays
Abstract
Xray and EUV (XEUV) driven photoevaporative winds acting on protoplanetary disks around young TTauri stars may crucially impact disk evolution, affecting both gas and dust distributions. We investigate the dust entrainment in XEUVdriven photoevaporative winds and compare our results to existing MHD and EUVonly models. For an Xray luminosity of $L_X = 2 \cdot 10^{30}\,\mathrm{erg/s}$ emitted by a $M_* = 0.7\,\mathrm{M}_\odot$ star, corresponding to a wind massloss rate of $\dot{M}_\mathrm{w} \simeq 2.6 \cdot 10^{8} \,\mathrm{M_\odot/yr}$, we find dust entrainment for sizes $a_0 \lesssim 11\,\mu$m ($9\,\mu$m) from the inner $25\,$AU ($120\,$AU). This is an enhancement over dust entrainment in less vigorous EUVdriven winds with $\dot{M}_\mathrm{w} \simeq 10^{10}\,\mathrm{M_\odot/yr}$. Our numerical model also shows deviations of dust grain trajectories from the gas streamlines even for $\mu$msized particles. In addition, we find a correlation between the size of the entrained grains and the maximum height they reach in the outflow.
 Publication:

arXiv eprints
 Pub Date:
 January 2020
 arXiv:
 arXiv:2001.10545
 Bibcode:
 2020arXiv200110545F
 Keywords:

 Astrophysics  Earth and Planetary Astrophysics;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 Accepted for publication in A&