Bio/Contact

Email: dkpowell AT ucsc DOT edu

I’m a third year PhD student in Astrophysics at UC Santa Cruz and I am particularly interested in exoplanet formation, planetary atmospheres and solar system dynamics. I work with Prof. Xi Zhang and Prof. Ruth Murray-Clay. I graduated from Harvard in 2014 with a BA in Astrophysics & Physics and spent a year traveling throughout Asia.

When I’m not doing research you can find me hiking in the Californian outdoors, experimenting in the kitchen, or lounging about with great tea and good books.

Research

Formation of Titanium and Silicate Clouds on Hot Jupiters

I currently work with Prof. Xi Zhang to constrain cloud formation on tidally locked exoplanets using a 1d microphysical code (CARMA) to model clouds parameters from first principles. This code is particularly powerful as we can uncover the true size distribution of cloud particles and determine their effect on observables with few assumptions.

Using Ice and Dust Lines to Constrain the Surface Densities of Protoplanetary Disks

I currently work with Prof. Ruth Murray-Clay to determine the surface density of protoplanetary disks through the consideration of of disk ‘dust lines’ which indicate the observed disk radial scale at different observational wavelengths. We provide an initial proof of concept of our model through an application to the disk TW Hydra and are able to estimate the disk dust-to-gas ratio, CO abundance, and accretion rate in addition to the total disk surface density. We find that our derived surface density profile and dust-to-gas ratio are consistent with the lower limits found through measurements of the HD gas that our theoretical CO ice line estimates have clear observational analogues.

Publications

Powell, D., Zhang, X., Gao, P., & Parmentier, V., “Formation of Silicate and Titanium Clouds on Hot Jupiters,” submitted to ApJ

Powell, D., Murray-Clay, R., & Schlichting, H.E., 2017, “Using Ice and Dust Lines to Constrain the Surface Densities of Protoplanetary Disks”

Espaillat, C., Andrews, S., Powell, D., et al. 2015, “The Transitional Disk around IRAS 04125+2902”

Kamble, A., Margutti, R., Soderberg, A. M., et al. inc. Powell, D. 2015, “Radio and X-rays From SN 2013df Enlighten Progenitors of Type IIb Supernovae”

Soderberg, A. et al. inc. Powell, D. 2012, The Astronomer’s Telegram, 3968, 1, “Spectroscopic Classification of the SN in NGC 4790”

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i = 0;

while (!deck.isInOrder()) {
    print 'Iteration ' + i;
    deck.shuffle();
    i++;
}

print 'It took ' + i + ' iterations to sort the deck.';

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  • Sagittis adipiscing.
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Name Description Price
Item One Ante turpis integer aliquet porttitor. 29.99
Item Two Vis ac commodo adipiscing arcu aliquet. 19.99
Item Three Morbi faucibus arcu accumsan lorem. 29.99
Item Four Vitae integer tempus condimentum. 19.99
Item Five Ante turpis integer aliquet porttitor. 29.99
100.00

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Name Description Price
Item One Ante turpis integer aliquet porttitor. 29.99
Item Two Vis ac commodo adipiscing arcu aliquet. 19.99
Item Three Morbi faucibus arcu accumsan lorem. 29.99
Item Four Vitae integer tempus condimentum. 19.99
Item Five Ante turpis integer aliquet porttitor. 29.99
100.00

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