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Browsing by Author "Bergin, Edwin"

Browsing by Author "Bergin, Edwin"

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  • Deep observations of O2 toward a low-mass protostar with Herschel-HIFI 
    Yildiz, Umut A.; Acharyya, Kinsuk; Goldsmith, Paul F.; van Dishoeck, Ewine F.; Melnick, Gary; Snell, Ronald; Liseau, René; Chen, Jo-Hsin; Pagani, Laurent; Bergin, Edwin; Caselli, Paola; Herbst, Eric; Kristensen, Lars E.; Visser, Ruud; Lis, Dariusz C.; Gerin, Maryvonne (2013)
    Context. According to traditional gas-phase chemical models, O<SUB>2</SUB> should be abundant in molecular clouds, but until recently, attempts to detect interstellar O<SUB>2</SUB> line emission with ground- and space-based ...
  • Evolution of X-ray and Far-ultraviolet Disk-dispersing Radiation Fields 
    Ingleby, Laura; Calvet, Nuria; Hernández, Jesus; Briceño, Cesar; Espaillat, Catherine; Miller, Jon; Bergin, Edwin; Hartmann, Lee (2011)
    We present new X-ray and far-ultraviolet (FUV) observations of T Tauri stars covering the age range 1-10 Myr. Our goals are to observationally constrain the intensity of radiation fields responsible for evaporating gas ...
  • The Far-ultraviolet &quot;Continuum&quot; in Protoplanetary Disk Systems. II. Carbon Monoxide Fourth Positive Emission and Absorption 
    France, Kevin; Schindhelm, Eric; Burgh, Eric B.; Herczeg, Gregory J.; Harper, Graham M.; Brown, Alexander; Green, James C.; Linsky, Jeffrey L.; Yang, Hao; Abgrall, Hervé; Ardila, David R.; Bergin, Edwin; Bethell, Thomas; Brown, Joanna M.; Calvet, Nuria; Espaillat, Catherine; Gregory, Scott G.; Hillenbrand, Lynne A.; Hussain, Gaitee; Ingleby, Laura; Johns-Krull, Christopher M.; Roueff, Evelyne; Valenti, Jeff A.; Walter, Frederick M. (2011)
    We exploit the high sensitivity and moderate spectral resolution of the Hubble Space Telescope Cosmic Origins Spectrograph to detect <br/>far-ultraviolet (UV) spectral features of carbon monoxide (CO) present in the inner ...
  • Herschel HIFI Observations of O2 toward Orion: Special Conditions for Shock Enhanced Emission 
    Chen, Jo-Hsin; Goldsmith, Paul F.; Viti, Serena; Snell, Ronald; Lis, Dariusz C.; Benz, Arnold; Bergin, Edwin; Black, John; Caselli, Paola; Encrenaz, Pierre; Falgarone, Edith; Goicoechea, Javier R.; Hjalmarson, Åke; Hollenbach, David; Kaufman, Michael; Melnick, Gary; Neufeld, David; Pagani, Laurent; van der Tak, Floris; van Dishoeck, Ewine; Yildiz, Umut A. (2014)
    We report observations of molecular oxygen (O<SUB>2</SUB>) rotational transitions at 487 GHz, 774 GHz, and 1121 GHz toward Orion Peak A. The O<SUB>2</SUB> lines at 487 GHz and 774 GHz are detected at velocities of 10-12 ...
  • Herschel Measurements of Molecular Oxygen in Orion 
    Goldsmith, Paul F.; Liseau, René; Bell, Tom A.; Black, John H.; Chen, Jo-Hsin; Hollenbach, David; Kaufman, Michael J.; Li, Di; Lis, Dariusz C.; Melnick, Gary; Neufeld, David A.; Pagani, Laurent; Snell, Ronald; Benz, Arnold O.; Bergin, Edwin; Bruderer, Simon; Caselli, Paola; Caux, Emmanuel; Encrenaz, Pierre; Falgarone, Edith; Gerin, Maryvonne; Goicoechea, Javier R.; Hjalmarson, Åke; Larsson, Bengt; Le Bourlot, Jacques; Le Petit, Franck; De Luca, Massimo; Nagy, Zsofia; Roueff, Evelyne; Sandqvist, Aage; van der Tak, Floris; van Dishoeck, Ewine F.; Vastel, Charlotte; Viti, Serena; Yildiz, Umut (2011)
    We report observations of three rotational transitions of molecular oxygen (O<SUB>2</SUB>) in emission from the H<SUB>2</SUB> Peak 1 position of vibrationally excited molecular hydrogen in Orion. We observed the 487 GHz, ...
  • Hot Gas Lines in T Tauri Stars 
    Ardila, David R.; Herczeg, Gregory J.; Gregory, Scott G.; Ingleby, Laura; France, Kevin; Brown, Alexander; Edwards, Suzan; Johns-Krull, Christopher M.; Linsky, Jeffrey L.; Yang, Hao; Valenti, Jeff A.; Abgrall, Hervé; Alexander, Richard D.; Bergin, Edwin; Bethell, Thomas; Brown, Joanna M.; Calvet, Nuria; Espaillat, Catherine; Hillenbrand, Lynne A.; Hussain, Gaitee; Roueff, Evelyne; Schindhelm, Eric R.; Walter, Frederick M. (2013)
    For Classical T Tauri Stars (CTTSs), the resonance doublets of N V, Si IV, and C IV, as well as the He II 1640 Å line, trace hot gas flows and act as diagnostics of the accretion process. In this paper we assemble a large ...
  • Ly? Dominance of the Classical T Tauri Far-ultraviolet Radiation Field 
    Schindhelm, Eric; France, Kevin; Herczeg, Gregory J.; Bergin, Edwin; Yang, Hao; Brown, Alexander; Brown, Joanna M.; Linsky, Jeffrey L.; Valenti, Jeff (2012)
    Far-ultraviolet (FUV) radiation plays an important role in determining chemical abundances in protoplanetary disks. H I Lyman ? (Ly?) is suspected to be the dominant component of the FUV emission from Classical T Tauri ...
  • Molecules with ALMA at Planet-forming Scales (MAPS): Complex Kinematics in the AS 209 Disk Induced by a Forming Planet and Disk Winds 
    Galloway-Sprietsma, Maria; Bae, Jaehan; Teague, Richard; Benisty, Myriam; Facchini, Stefano; Aikawa, Yuri; Alarcón, Felipe; Andrews, Sean M.; Bergin, Edwin; Cataldi, Gianni; Cleeves, L. Ilsedore; Czekala, Ian; Guzmán, Viviana V.; Huang, Jane; Law, Charles J.; Le Gal, Romane; Liu, Yao; Long, Feng; Ménard, François; Öberg, Karin I.; Walsh, Catherine; Wilner, David J. (2023)
    We study the kinematics of the AS 209 disk using the J = 2-1 transitions of <sup>12</sup>CO, <sup>13</sup>CO, and C<sup>18</sup>O. We derive the radial, azimuthal, and vertical velocity of the gas, taking into account the ...
  • Near-ultraviolet Excess in Slowly Accreting T Tauri Stars: Limits Imposed by Chromospheric Emission 
    Ingleby, Laura; Calvet, Nuria; Bergin, Edwin; Herczeg, Gregory; Brown, Alexander; Alexander, Richard; Edwards, Suzan; Espaillat, Catherine; France, Kevin; Gregory, Scott G.; Hillenbrand, Lynne; Roueff, Evelyne; Valenti, Jeff; Walter, Frederick; Johns-Krull, Christopher M.; Brown, Joanna M.; Linsky, Jeffrey; McClure, Melissa; Ardila, David; Abgrall, Hervé; Bethell, Thomas; Hussain, Gaitee; Yang, Hao (2011)
    Young stars surrounded by disks with very low mass accretion rates are likely in the final stages of inner disk evolution and therefore particularly interesting to study. We present ultraviolet (UV) observations of the ...
  • Origins Space Telescope science drivers to design traceability 
    Meixner, Margaret; Cooray, Asantha; Leisawitz, David T.; Staguhn, Johannes G.; Armus, Lee; Battersby, Cara; Bauer, James; Benford, Dominic; Bergin, Edwin; Bradford, Charles Matt; Burgarella, Denis; Carey, Sean; De Beck, Elvire; Ennico-Smith, Kimberly; Fortney, Jonathan J.; Gerin, Maryvonne; Helmich, Frank P.; Kataria, Tiffany; Mamajek, Eric E.; Melnick, Gary J.; Milam, Stefanie N.; Moseley, Samuel Harvey; Narayanan, Desika; Neff, Susan G.; Padgett, Deborah; Pontoppidan, Klaus; Pope, Alexandra; Roellig, Thomas L.; Sakon, Itsuki; Sandstrom, Karin; Scott, Douglas; Sheth, Kartik; Stevenson, Kevin B.; Su, Kate Y.; Vieira, Joaquin; Wiedner, Martina C.; Wright, Edward; Zmuidzinas, Jonas; Origins Study Team (2021)
    The Origins Space Telescope (Origins) concept is designed to investigate the creation and dispersal of elements essential to life, the formation of planetary systems, and the transport of water to habitable worlds and the ...
  • The TW Hya Rosetta Stone Project. III. Resolving the Gaseous Thermal Profile of the Disk 
    Calahan, Jenny K.; Bergin, Edwin; Zhang, Ke; Teague, Richard; Cleeves, Ilsedore; Bergner, Jennifer; Blake, Geoffrey A.; Cazzoletti, Paolo; Guzmán, Viviana; Hogerheijde, Michiel R.; Huang, Jane; Kama, Mihkel; Loomis, Ryan; Öberg, Karin; Qi, Charlie; van Dishoeck, Ewine F.; Terwisscha van Scheltinga, Jeroen; Walsh, Catherine; Wilner, David (2021)
    The thermal structure of protoplanetary disks is a fundamental characteristic of the system that has wide-reaching effects on disk evolution and planet formation. In this study, we constrain the 2D thermal structure of the ...
  • An Unbiased ALMA Spectral Survey of the LkCa 15 and MWC 480 Protoplanetary Disks 
    Loomis, Ryan A.; Öberg, Karin I.; Andrews, Sean M.; Bergin, Edwin; Bergner, Jennifer; Blake, Geoffrey A.; Cleeves, L. Ilsedore; Czekala, Ian; Huang, Jane; Le Gal, Romane; Ménard, Francois; Pegues, Jamila; Qi, Chunhua; Walsh, Catherine; Williams, Jonathan P.; Wilner, David J. (2020)
    The volatile contents of protoplanetary disks both set the potential for planetary chemistry and provide valuable probes of defining disk system characteristics such as stellar mass, gas mass, ionization, and temperature ...

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