Now showing items 1-18 of 18

    • A proposed new diagnostic for Herbig disc geometry FWHM versus J of CO ro-vibrational lines 

      Bertelsen, R.; Kamp, I.; Van der Plas, Gerrit; Van der Ancker, M. E.; Waters, L. B. F. M.; Thi, W. F.; Woitke, P. (EDP Sciences, 2016)
      Aims. The CO ro-vibrational lines observed from Herbig group II discs are often seen to be broad, while the same lines observed from group I discs are often narrow. This difference is not well understood. In this paper we ...
    • Accretion kinematics through the warped transition disk in hd142527 from resolved CO(6-5) observations 

      Casassus Montero, Simón; Marino Estay, Sebastián; Pérez, S.; Román, P.; Dunhill, A.; Armitage, P. J.; Cuadra, J.; Wootten, A.; Van der Plas, Gerrit; Cieza, L.; Moral, Víctor; Christiaens, V.; Montesinos, Matías (IOP Publishing, 2015)
      The finding of residual gas in the large central cavity of the HD 142527 disk motivates questions regarding the origin of its non-Keplerian kinematics and possible connections with planet formation. We aim to understand ...
    • An ALMA survey for disks orbiting low-mass stars in the TW Hya Association 

      Rodríguez, David; Van der Plas, Gerrit; Kastner, Joel; Schneider, Adam; Faherty, Jacqueline K.; Mardones Pérez, Diego; Mohanty, Subhanjoy; Principe, David (EDP Sciences, 2015)
      We carried out an ALMA survey of 15 confirmed or candidate low-mass (<0.2 M ) members of the TW Hya Association (TWA) with the goal of detecting molecular gas in the form of CO emission, as well as of providing constraints ...
    • An ALMA survey for disks orbiting low-mass stars in the TW Hya Association 

      Rodríguez, David; Van der Plas, Gerrit; Kastner, Joel; Schneider, Adam; Faherty, Jacqueline; Mardones Pérez, Diego; Mohanty, Subhanjoy; Principe, David (EDP Sciences, 2015)
      We carried out an ALMA survey of 15 confirmed or candidate low-mass (<0.2 M ) members of the TW Hya Association (TWA) with the goal of detecting molecular gas in the form of CO emission, as well as of providing constraints ...
    • An 80 au cavity in the disk around HD 34282 

      Van der Plas, Gerrit; Menard, F.; Canovas, H.; Avenhaus, H.; Casassus Montero, Simón; Pinte, Christophe; Cáceres, C.; Cieza, L. (EDP Sciences, 2017)
      Context. Large cavities in disks are important testing grounds for the mechanisms proposed to drive disk evolution and dispersion, such as dynamical clearing by planets and photoevaporation. Aims. We aim to resolve the ...
    • Co gas inside the protoplanetary disk cavity in HD142527: disk structure from ALMA 

      Pérez, S.; Casassus Montero, Simón; Ménard, Francois; Román, P.; Van der Plas, Gerrit; Cieza, L.; Pinte, Christophe; Christiaens, V.; Hales, A. (IOP Pub, 2015)
      Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD142527 hosts a massive protoplanetary disk with a large cavity that extends up to 140 AU from the ...
    • A Compact Concentration of Large Grains in the HD 142527 Protoplanetary Dust Trap 

      Casassus Montero, Simón; Wright, Chris; Marino, Sebastian; Maddison, Sarah; Wootten, Al; Roman, Pablo; Pérez, Sebastian; Pinilla, Paola; Wyatt, Mark; Moral, Victor; Ménard, Francois; Christiaens, Valentin; Cieza, Lucas; Van der Plas, Gerrit (The American Astronomical Society, 2015-10-20)
      A pathway to the formation of planetesimals, and eventually giant planets, may occur in concentrations of dust grains trapped in pressure maxima. Dramatic crescent-shaped dust concentrations have been seen in recent ...
    • A compact concentration of large grains in the HD 142527 protoplanetary dust trap 

      Casassus Montero, Simón; Wright, Chris; Marino Estay, Sebastián; Maddison, Sarah T.; Wootten, Al; Román Asenjo, Pablo; Pérez, Sebastián; Pinilla, Paola; Wyatt, Mark; Moral, Víctor; Ménard, Francois; Christiaens, Valentín; Cieza, Lucas; Van der Plas, Gerrit (IOP Publishing, 2015)
      A pathway to the formation of planetesimals, and eventually giant planets, may occur in concentrations of dust grains trapped in pressure maxima. Dramatic crescent-shaped dust concentrations have been seen in recent radio ...
    • Dust modeling of the combined ALMA and SPHERE datasets of HD 163296. Is HD 163296 really a Meeus group II disk? 

      Muro Arena, G. A.; Dominik, C.; Waters, L. B. F. M.; Min, M.; Klarmann, L.; Ginski, C.; Isella, A.; Benisty, M.; Pohl, A.; Garufi, A.; Hagelberg, J.; Langlois, M.; Menard, F.; Pinte, Christophe; Sezestre, E.; Van der Plas, Gerrit; Villenave, M.; Delboulbe, A.; Magnard, Y.; Moeller Nilsson, O.; Pragt, J.; Rabou, P.; Roelfsema, R. (ESO, 2018-06)
      Context. Multiwavelength observations are indispensable in studying disk geometry and dust evolution processes in protoplanetary disks. Aims. We aim to construct a three-dimensional model of HD163296 that is capable ...
    • Homogeneous analysis of the dust morphology of transition disks observed with ALMA: investigating dust trapping and the origin of the cavities 

      Pinilla, P.; Tazzari, M.; Pascucci, I.; Youdin, A. N.; Garufi, A.; Manara, C. F.; Testi, L.; Van der Plas, Gerrit; Barenfeld, S. A.; Canovas, H.; Cox, E. G.; Hendler, N. P.; Pérez, L. M.; van der Marel, N. (Iop Publishing LTD., 2018-05-20)
      We analyze the dust morphology of 29 transition disks (TDs) observed with Atacama Large (sub-)Millimeter Array (ALMA) at (sub-)millimeter emission. We perform the analysis in the visibility plane to characterize the total ...
    • Millimeter spectral indices and dust trapping by planets in brown dwarf disks 

      Pinilla, P.; Quiroga Núñez, L. H.; Benisty, M.; Natta, A.; Ricci, L.; Henning, Thomas; Van der Plas, Gerrit; Birnstiel, T.; Testi, L.; Ward Duon, K. (IOP Publishing Ltd, 2017)
      Disks around brown dwarfs (BDs) are excellent laboratories to study the first steps of planet formation in cold and low-mass disk conditions. The radial-drift velocities of dust particles in BD disks higher than in disks ...
    • Observations of gas flows inside a protoplanetary gap 

      Van der Plas, Gerrit; Pérez M., Sebastián; Dent, William R. F.; Fomalont, Ed; Hagelberg, Janis; Hales, Antonio; Jordán, Andrés; Mawet, Dimitri; Ménard, Francois; Wootten, Al; Wilner, David; Hughes, A. Meredith; Schreiber, Matthias R.; Girard, Julien H.; Ercolano, Bárbara; Canovas, Héctor; Román, Pablo E.; Casassus Montero, Simón; Salinas, Vachail (Nature Publishing Group, 2013-01-10)
      The formation of gaseous giant planets is thought to occur in the first few million years after stellar birth. Models1 predict that the process produces a deep gap in the dust component (shallower in the gas2, 3, 4). ...
    • Radiation thermo-chemical models of protoplanetary discs IV. Modelling CO ro-vibrational emission from Herbig Ae discs 

      Thi, W. F.; Kamp, I.; Woitke, P.; Van der Plas, Gerrit; Bertelsen, R.; Wiesenfeld, L. (EDP Sciences, 2013)
      Context. The carbon monoxide (CO) ro-vibrational emission from discs around Herbig Ae stars and T Tauri stars with strong ultraviolet emissions suggests that fluorescence pumping from the ground X1Σ+ to the electronic A1Π ...
    • Spatially resolved HCN J = 4-3 and CS J = 7-6 emission from the disk around HD 142527 

      Van der Plas, Gerrit; Casassus Montero, Simón; Ménard, Francois; Pérez, Sebastián; Thi, W. F.; Pinte, Christophe; Christiaens, Valentin (The American Astronomical Society, 2014-09-10)
      The disk around HD 142527 attracts a great amount of attention compared to others because of its resolved (sub-)millimeter dust continuum that is concentrated into the shape of a horseshoe toward the north of the star. ...
    • Spiral Arms in the Disk of HD 142527 from CO Emission Lines with ALMA 

      Christiaens, Valentin; Casassus Montero, Simón; Pérez, Sebastián; Van der Plas, Gerrit; Ménard, Francois (2014-04-10)
      In view of both the size of its gap and the previously reported asymmetries and near-infrared spiral arms, the transition disk of the Herbig Fe star HD 142527 constitutes a remarkable case study. This paper focuses on ...
    • The structure of disks around Herbig Ae/Be stars as traced by CO ro-vibrational emission 

      Van der Plas, Gerrit; Ancker, M. E. van den; Waters, L. B. F. M.; Dominik, C. (EDP Sciences, 2015)
      Aims. We study the emission and absorption of CO ro-vibrational lines in the spectra of intermediate mass pre-main-sequence stars with the aim to determine both the spatial distribution of the CO gas and its physical ...
    • The Taurus Boundary of stellar/substellar (TBOSS) survey. II. Disk masses from ALMA continuum observations 

      Ward Duong, K.; Patience, J.; Bulger, J.; Van der Plas, Gerrit; Menard, F.; Pinte, Christophe; Jackson, A. P.; Bryden, G.; Turner, N. J.; Harvey, P.; Hales, A.; Rosa, R. J. de (IOP Publishing Ltd, 2018)
      We report 885 mu m ALMA continuum flux densities for 24 Taurus members spanning the stellar/substellar boundary with spectral types from M4 to M7.75. Of the 24 systems, 22 are detected at levels ranging from 1.0 to 55.7 ...
    • Variability in the CO ro-vibrational lines from HD163296 

      Hein Bertelsen, Rosina P.; Kamp, I.; Van der Plas, Gerrit; Van den Ancker, M. E.; Waters, L. B. F. M.; Thi, W.-F.; Woitke, P. (Oxford Univ Press, 2016)
      We present for the first time a direct comparison of multi-epoch (2001-2002 and 2012) CO ro-vibrational emission lines from HD 163296. We find that both the line shapes and the FWHM (full width at half-maximum) differ ...