Now showing items 1-9 of 9

    • Applications of High-Resolution Observations of Millimeter Wavelengths 

      Rosenfeld, Katherine (2015-12-17)
      nterferometric observations at millimeter wavelengths provide a precious, detailed view of certain astrophysical objects. This thesis is composed of studies that both rely on and enable this technique to study the structure ...
    • Chemical Imaging of the CO Snow Line in the HD 163296 Disk 

      Qi, Chunhua; Oberg, Karin; Andrews, Sean M.; Wilner, David J.; Bergin, Edwin A.; Hughes, Amy L; Hogherheijde, Michiel; D’Alessio, Paola (IOP Publishing, 2015)
      The condensation fronts (snow lines) of H2O, CO, and other abundant volatiles in the midplane of a protoplanetary disk affect several aspects of planet formation. Locating the CO snow line, where the CO gas column density ...
    • The comet-like composition of a protoplanetary disk as revealed by complex cyanides 

      Oberg, Karin; Guzmán, Viviana V.; Furuya, Kenji; Qi, Chunhua; Aikawa, Yuri; Andrews, Sean M.; Loomis, Ryan; Wilner, David J. (Nature Publishing Group, 2015)
      Observations of comets and asteroids show that the Solar Nebula that spawned our planetary system was rich in water and organic molecules. Bombardment brought these organics to the young Earth's surface, seeding its early ...
    • The distribution and chemistry of H2CO in the DM Tau protoplanetary disk 

      Loomis, Ryan; Cleeves, Lauren Ilsedore; Oberg, Karin; Guzman, Viviana V.; Andrews, Sean M. (IOP Publishing, 2015)
      H2CO ice on dust grains is an important precursor of complex organic molecules (COMs). H2CO gas can be readily observed in protoplanetary disks and may be used to trace COM chemistry. However, its utility as a COM probe ...
    • Double DCO+ rings reveal CO ice desorption in the outer disk around IM Lup 

      Oberg, Karin; Furuya, Kenji; Loomis, Ryan; Aikawa, Yuri; Andrews, Sean M.; Qi, Chunhua; Dishoeck, Ewine F. van; Wilner, David J. (IOP Publishing, 2015)
      In a protoplanetary disk, a combination of thermal and non-thermal desorption processes regulate where volatiles are liberated from icy grain mantles into the gas phase. Non-thermal desorption should result in volatile-enriched ...
    • The Fundamental Properties of Young Stars 

      Czekala, Ian (2016-05-18)
      Accurate knowledge of the fundamental properties of stars--mass, temperature, and luminosity--is key to our understanding of stellar evolution. In particular, empirical measurements of stellar mass are difficult to make ...
    • Imaging of the CO Snow Line in a Solar Nebula Analog 

      Qi, Chunhua; Oberg, Karin; Wilner, David J.; D'Alessio, Paola; Bergin, E.; Andrews, Sean M.; Blake, G. A.; Hogerheijde, M. R.; van Dishoeck, E. F. (American Association for the Advancement of Science (AAAS), 2013)
      Planets form in the disks around young stars. Their formation efficiency and composition are intimately linked to the protoplanetary disk locations of “snow lines” of abundant volatiles. We present chemical imaging of the ...
    • An Old Disk Still Capable of Forming a Planetary System 

      Bergin, Edwin A.; Cleeves, L. Ilsedore; Gorti, Uma; Zhang, Ke; Blake, Geoffrey A.; Green, Joel D.; Andrews, Sean M.; Evans II, Neal J.; Henning, Thomas; Oberg, Karin; Pontoppidan, Klaus; Qi, Chunhua; Salyk, Colette; van Dishoeck, Ewine F. (Nature Publishing Group, 2013)
      From the masses of the planets orbiting the Sun, and the abundance of elements relative to hydrogen, it is estimated that when the Solar System formed, the circumstellar disk must have had a minimum mass of around 0.01 ...
    • Protoplanetary Disks in Multiple Star Systems 

      Harris, Robert Jason (2013-10-18)
      Most stars are born in multiple systems, so the presence of a stellar companion may commonly influence planet formation. Theory indicates that companions may inhibit planet formation in two ways. First, dynamical ...