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Browsing by Author "Qi, Chunhua"

Browsing by Author "Qi, Chunhua"

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  • Huang, Jane; Öberg, Karin I.; Qi, Chunhua; Aikawa, Yuri; Andrews, Sean M.; Furuya, Kenji; Guzmán, Viviana V.; Loomis, Ryan A.; van Dishoeck, Ewine F.; Wilner, David J. (2017)
    The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is inherited or reprocessed ...
  • Pegues, Jamila; Öberg, Karin I.; Bergner, Jennifer B.; Loomis, Ryan A.; Qi, Chunhua; Le Gal, Romane; Cleeves, L. Ilsedore; Guzmán, Viviana V.; Huang, Jane; Jørgensen, Jes K.; Andrews, Sean M.; Blake, Geoffrey A.; Carpenter, John M.; Schwarz, Kamber R.; Williams, Jonathan P.; Wilner, David J. (2020)
    H<SUB>2</SUB>CO is one of the most abundant organic molecules in protoplanetary disks and can serve as a precursor to more complex organic chemistry. We present an Atacama Large Millimeter/submillimeter Array survey of ...
  • Aikawa, Yuri; Furuya, Kenji; Nomura, Hideko; Qi, Chunhua (2015)
    We investigate the chemistry of ion molecules in protoplanetary disks, motivated by the detection of the N<SUB>2</SUB>H<SUP>+</SUP> ring around
  • Pegues, Jamila; Öberg, Karin I.; Bergner, Jennifer B.; Huang, Jane; Pascucci, Ilaria; Teague, Richard; Andrews, Sean M.; Bergin, Edwin A.; Cleeves, L. Ilsedore; Guzmán, Viviana V.; Long, Feng; Qi, Chunhua; Wilner, David J. (2021)
    M-stars are the most common hosts of planetary systems in the Galaxy. Protoplanetary disks around M-stars thus offer a prime opportunity to study the chemistry of planet-forming environments. We present an Atacama Large ...
  • Qi, Chunhua; Öberg, Karin I.; Andrews, Sean M.; Wilner, David J.; Bergin, Edwin A.; Hughes, A. Meredith; Hogherheijde, Michiel; D'Alessio, Paola (2015)
    The condensation fronts (snow lines) of H<SUB>2</SUB>O, 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 ...
  • Law, Charles J.; Crystian, Sage; Teague, Richard; Öberg, Karin I.; Rich, Evan A.; Andrews, Sean M.; Bae, Jaehan; Flaherty, Kevin; Guzmán, Viviana V.; Huang, Jane; Ilee, John D.; Kastner, Joel H.; Loomis, Ryan A.; Long, Feng; Pérez, Laura M.; Pérez, Sebastián; Qi, Chunhua; Rosotti, Giovanni P.; Ruíz-Rodríguez, Dary; Tsukagoshi, Takashi; Wilner, David J. (2022)
    High spatial resolution CO observations of midinclination (?30°-75°) protoplanetary disks offer an opportunity to study the vertical distribution of CO emission and temperature. The asymmetry of line emission relative to ...
  • Öberg, Karin I.; Guzmán, Viviana V.; Furuya, Kenji; Qi, Chunhua; Aikawa, Yuri; Andrews, Sean M.; Loomis, Ryan; Wilner, David J. (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&#39;s surface. Unlike asteroids, ...
  • Cleeves, L. Ilsedore; Bergin, Edwin A.; Qi, Chunhua; Adams, Fred C.; Öberg, Karin I. (2015)
    We present an observational and theoretical study of the primary ionizing agents (cosmic rays (CRs) and X-rays) in the TW Hya protoplanetary disk. We use a set of resolved and unresolved observations of molecular ions and ...
  • Furuya, Kenji; Tsukagoshi, Takashi; Qi, Chunhua; Nomura, Hideko; Cleeves, L. Ilsedore; Lee, Seokho; Yoshida, Tomohiro C. (2022)
    The oxygen isotope fractionation scenario, which has been developed to explain the oxygen isotope anomaly in solar system materials, predicts that CO gas is depleted in <SUP>18</SUP>O in protoplanetary disks, where segregation ...
  • Öberg, Karin I.; Qi, Chunhua; Fogel, Jeffrey K. J.; Bergin, Edwin A.; Andrews, Sean M.; Espaillat, Catherine; van Kempen, Tim A.; Wilner, David J.; Pascucci, Ilaria (2010)
    Chemistry plays an important role in the structure and evolution of protoplanetary disks, with implications for the composition of comets and planets. This is the first of a series of papers based on data from DISCS, a ...
  • Öberg, Karin I.; Qi, Chunhua; Fogel, Jeffrey K. J.; Bergin, Edwin A.; Andrews, Sean M.; Espaillat, Catherine; Wilner, David J.; Pascucci, Ilaria; Kastner, Joel H. (2011)
    This is the second in a series of papers based on data from DISCS, a Submillimeter Array observing program aimed at spatially and spectrally resolving the chemical composition of 12 protoplanetary disks. We present data ...
  • Öberg, Karin I.; Furuya, Kenji; Loomis, Ryan; Aikawa, Yuri; Andrews, Sean M.; Qi, Chunhua; van Dishoeck, Ewine F.; Wilner, David J. (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 ...
  • Hughes, A. Meredith; Wilner, David J.; Andrews, Sean M.; Qi, Chunhua; Hogerheijde, Michiel R. (2011)
  • Favre, Cécile; Bergin, Edwin A.; Cleeves, L. Ilsedore; Hersant, Franck; Qi, Chunhua; Aikawa, Yuri (2015)
    In this Letter, we model the chemistry of DCO<SUP>+</SUP> in protoplanetary disks. We find that the overall distribution of the DCO<SUP>+</SUP> abundance is qualitatively similar to that of CO but is dominated by a thin ...
  • Booth, Alice S.; Walsh, Catherine; Ilee, John D.; Notsu, Shota; Qi, Chunhua; Nomura, Hideko; Akiyama, Eiji (2019)
    Measurements of the gas mass are necessary to determine the planet formation potential of protoplanetary disks. Observations of rare CO isotopologues are typically used to determine disk gas masses; however, if the line ...
  • Qi, Chunhua; Öberg, Karin I.; Wilner, David J.; Rosenfeld, Katherine A. (2013)
    We report the first detection of c-C<SUB>3</SUB>H<SUB>2</SUB> in a circumstellar disk. The c-C<SUB>3</SUB>H<SUB>2</SUB> J = 6-5 line (217.882 GHz) is detected and imaged through Atacama Large Millimeter Array (ALMA) Science ...
  • Favre, Cécile; Fedele, Davide; Semenov, Dmitry; Parfenov, Sergey; Codella, Claudio; Ceccarelli, Cecilia; Bergin, Edwin A.; Chapillon, Edwige; Testi, Leonardo; Hersant, Franck; Lefloch, Bertrand; Fontani, Francesco; Blake, Geoffrey A.; Cleeves, L. Ilsedore; Qi, Chunhua; Schwarz, Kamber R.; Taquet, Vianney (2018)
    The formation of asteroids, comets, and planets occurs in the interior of protoplanetary disks during the early phase of star formation. Consequently, the chemical composition of the disk might shape the properties of the ...
  • Cordiner, M. A.; Roth, N. X.; Milam, S. N.; Villanueva, G. L.; Bockelée-Morvan, D.; Remijan, A. J.; Charnley, S. B.; Biver, N.; Lis, D. C.; Qi, Chunhua; Bonev, B. P.; Crovisier, J.; Boissier, J. (2023)
    Gas-phase molecules in cometary atmospheres (comae) originate primarily from (1) outgassing by the nucleus, (2) sublimation of icy grains in the near-nucleus coma, and (3) coma (photo)chemical processes. However, the ...
  • Qi, Chunhua; Öberg, Karin I.; Wilner, David J. (2013)
    We present Submillimeter Array (SMA) observations of H<SUB>2</SUB>CO and N<SUB>2</SUB>H<SUP>+</SUP> emission in the disks around the T Tauri star
  • Öberg, Karin I.; Guzmán, Viviana V.; Merchantz, Christopher J.; Qi, Chunhua; Andrews, Sean M.; Cleeves, L. Ilsedore; Huang, Jane; Loomis, Ryan A.; Wilner, David J.; Brinch, Christian; Hogerheijde, Michiel (2017)
    H<SUB>2</SUB>CO is one of the most readily detected organic molecules in protoplanetary disks. Yet its distribution and dominant formation pathway(s) remain largely unconstrained. To address these issues, we present ALMA ...

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