Now showing items 1-20 of 30

  • The accretion dynamics of EX Lupi in quiescence : the star, the spot, and the accretion column 

    Sicilia-Aguilar, Aurora; Fang, Min; Roccatagliata, Veronica; Collier Cameron, Andrew; Kóspál, Ágnes; Henning, Thomas; Ábrahám, Peter; Sipos, Nikoletta (2015-08-06) - Journal article
    Context. EX Lupi is a young, accreting M0 star and the prototype of EXor variable stars. Its spectrum is very rich in emission lines, including many metallic lines with narrow and broad components. The presence of a close ...
  • The accumulation and trapping of grains at planet gaps : effects of grain growth and fragmentation 

    Gonzalez, J.-F.; Laibe, G.; Maddison, S.T.; Pinte, C.; Ménard, F. (2015) - Journal article
    We model the dust evolution in protoplanetary disks with full 3D, Smoothed Particle Hydrodynamics (SPH), two-phase (gas+dust) hydrodynamical simulations. The gas+dust dynamics, where aerodynamic drag leads to the vertical ...
  • CO ro-vibrational lines in HD 100546 A search for disc asymmetries and the role of fluorescence 

    Hein Bertelsen, R.P.; Kamp, I.; Goto, M.; Van Der Plas, G.; Thi, W.-F.; Waters, L.B.F.M.; Van Den Ancker, M.E.; Woitke, P. (2014-01-14) - Journal article
    Aims. We have studied the emission of CO ro-vibrational lines in the disc around the Herbig Be star HD 100546 to determine physical properties, disc asymmetries, the CO excitation mechanism, and the spatial extent of the ...
  • Constraining the structure of the transition disk HD 135344B (SAO 206462) by simultaneous modeling of multiwavelength gas and dust observations 

    Carmona, A.; Pinte, C.; Thi, W.F.; Benisty, M.; Ménard, F.; Grady, C.; Kamp, I.; Woitke, P.; Olofsson, J.; Roberge, A.; Brittain, S.; Duchêne, G.; Meeus, G.; Martin-Zaïdi, C.; Dent, B.; Le Bouquin, J.B.; Berger, J.P. (2014-07-10) - Journal article
    Context. Constraining the gas and dust disk structure of transition disks, particularly in the inner dust cavity, is a crucial step toward understanding the link between them and planet formation. HD 135344B is an accreting ...
  • CSI 2264 : Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer - Evidence for multiple origins of variability 

    Cody, A.M.; Stauffer, J.; Baglin, A.; Micela, G.; Rebull, L.M.; Flaccomio, E.; Morales-Calderón, M.; Aigrain, S.; Bouvier, J.; Hillenbrand, L.A.; Gutermuth, R.; Song, I.; Turner, N.; Alencar, S.H.P.; Zwintz, K.; Plavchan, P.; Carpenter, J.; Findeisen, K.; Carey, S.; Terebey, S.; Hartmann, L.; Calvet, N.; Teixeira, P.; Vrba, F.J.; Wolk, S.; Covey, K.; Poppenhaeger, K.; Günther, H.M.; Forbrich, J.; Whitney, B.; Affer, L.; Herbst, W.; Hora, J.; Barrado, D.; Holtzman, J.; Marchis, F.; Wood, K.; Guimarães, M.M.; Lillo Box, J.; Gillen, E.; McQuillan, A.; Espaillat, C.; Allen, L.; D'Alessio, P.; Favata, F. (2014-04-01) - Journal article
    We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30 day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination ...
  • The disk around the brown dwarf KPNO TAU 3 

    Broekhoven-Fiene, H.; Matthews, B.; Duchêne, G.; Di Francesco, J.; Scholz, A.; Chrysostomou, A.; Jayawardhana, R. (2014-07-10) - Journal article
    We present submillimeter observations of the young brown dwarfs KPNO Tau 1, KPNO Tau 3, and KPNO Tau 6 at 450 μm and 850 μm taken with the Submillimetre Common-User Bolometer Array on the James Clerk Maxwell Telescope. ...
  • Diversity in the outcome of dust radial drift in protoplanetary discs 

    Pinte, C.; Laibe, G. (2014-05-01) - Journal article
    The growth of dust particles into planet embryos needs to circumvent the "radial-drift barrier", i.e. the accretion of dust particles onto the central star by radial migration. The outcome of the dust radial migration is ...
  • Dust and gas mixtures with multiple grain species - a one-fluid approach 

    Laibe, Guillaume; Price, Daniel J. (2014-10-21) - Journal article
    We derive the single-fluid evolution equations describing a mixture made of a gas phase and an arbitrary number of dust phases, generalizing the approach developed by Laibe & Price. A generalization for continuous dust ...
  • An enigmatic pointlike feature within the HD 169142 transitional disk 

    Biller, Beth A.; Males, Jared; Rodigas, Timothy; Morzinski, Katie; Close, Laird M.; Juhász, Attila; Follette, Katherine B.; Lacour, Sylvestre; Benisty, Myriam; Sicilia-Aguilar, Aurora; Hinz, Philip M.; Weinberger, Alycia; Henning, Thomas; Pott, Jörg-Uwe; Bonnefoy, Mickaël; Köhler, Rainer (2014-08-20) - Journal article
    We report the detection of a faint pointlike feature possibly related to ongoing planet-formation in the disk of the transition disk star HD 169142. The pointlike feature has a Delta-mag(L) ∼ 6.4, at a separation of ∼ 0" ...
  • Gas lines from the 5-Myr old optically thin disk around HD 141569A Herschel observations and modeling 

    Thi, W.-F.; Pinte, C.; Pantin, E.; Augereau, J.C.; Meeus, G.; Ménard, F.; Martin-Zaïdi, C.; Woitke, P.; Riviere-Marichalar, P.; Kamp, I.; Carmona, A.; Sandell, G.; Eiroa, C.; Dent, W.; Montesinos, B.; Aresu, G.; Meijerink, R.; Spaans, M.; White, G.; Ardila, D.; Lebreton, J.; Mendigutía, I.; Brittain, S. (2014-01) - Journal article
    Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99–116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by ...
  • Herschel evidence for disk flattening or gas depletion in transitional disks 

    Keane, J.T.; Pascucci, I.; Espaillat, C.; Woitke, P.; Andrews, S.; Kamp, I.; Thi, W.-F.; Meeus, G.; Dent, W.R.F. (2014-06-01) - Journal article
    Transitional disks are protoplanetary disks characterized by reduced near- and mid-infrared emission, with respect to full disks. This characteristic spectral energy distribution indicates the presence of an optically thin ...
  • The Herschel/PACS view of the Cep OB2 region : global protoplanetary disk evolution and clumpy star formation 

    Sicilia-Aguilar, Aurora; Roccatagliata, Veronica; Getman, Konstantin; Rivière-Marichalar, Pablo; Birnstiel, Tilman; Merín, Bruno; Fang, Min; Henning, Thomas; Eiroa, Carlos; Currie, Thayne (2015-01) - Journal article
    Context. The Cep OB2 region, with its two intermediate-aged clusters Tr 37 and NGC7160, is a paradigm of sequential star formation and an ideal site for studies of protoplanetary disk evolution. Aims. We use Herschel data ...
  • Lights and shadows : multi-wavelength analysis of young stellar objects and their protoplanetary discs 

    Rigon, Laura (University of St Andrews, 2016-03) - Thesis
    Stars form from the collapse of molecular clouds and evolve in an environment rich in gas and dust before becoming Main Sequence stars. During this phase, characterised by the presence of a protoplanetary disc, stars ...
  • An M-dwarf star in the transition disk of Herbig HD142527; Physical parameters and orbital elements 

    Lacour, S.; Biller, B.; Cheetham, A.; Greenbaum, A.; Pearce, T.; Marino, S.; Tuthill, P.; Pueyo, L.; Mamajek, E. E.; Girard, J. H.; Sivaramakrishnan, A.; Bonnefoy, M.; Baraffe, I.; Chauvin, G.; Olofsson, J.; Juhasz, A.; Benisty, M.; Pott, J.-U.; Sicilia-Aguilar, A.; Henning, T.; Cardwell, A.; Goodsell, S.; Graham, J. R.; Hibon, P.; Ingraham, P.; Konopacky, Q.; Macintosh, B.; Oppenheimer, R.; Perrin, M.; Rantakyrö, F.; Sadakuni, N.; Thomas, S. (2016-06) - Journal article
    HD 142527A is one of the most studied Herbig Ae/Be stars with a transitional disk, as it has the largest imaged gap in any protoplanetary disk: the gas is cleared from 30 to 90 AU. The HD 142527 system is also unique in ...
  • Mid-IR spectra of pre-main sequence Herbig stars : an explanation for the non-detections of water lines 

    Antonellini, S.; Kamp, I.; Lahuis, F.; Woitke, Peter; Thi, W. -F.; Meijerink, R.; Aresu, G.; Spaans, M.; Güdel, M.; Liebhart, A. (2016-01) - Journal article
    Context. The mid-IR detection rate of water lines in disks around Herbig stars disks is about 5%, while it is around 50% for disks around T Tauri stars. The reason for this is still unclear. Aims. In this study, we want ...
  • Monte Carlo radiation transfer studies of protoplanetary environments 

    Walker, Christina H. (University of St Andrews, 2007-06-19) - Thesis
    Monte Carlo radiation transfer provides an efficient modelling tool for probing the dusty local environment of young stars. Within this thesis, such theoretical models are used to study the disk structure of objects across ...
  • Multiwavelength optical properties of compact dust aggregates in protoplanetary disks 

    Min, M.; Rab, Ch; Woitke, Peter; Dominik, C.; Ménard, F. (2016-01) - Journal article
    Context. In protoplanetary disks micron-size dust grains coagulate to form larger structures with complex shapes and compositions. The coagulation process changes the absorption and scattering properties of particles in ...
  • Nature of the gas and dust around 51 Ophiuchi : modelling continuum and Herschel line observations 

    Thi, W.F.; Ménard, F.; Meeus, G.; Carmona, A.; Riviere-Marichalar, P.; Augereau, J.-C.; Kamp, I.; Woitke, P.; Pinte, C.; Mendigutía, I.; Eiroa, C.; Montesinos, B.; Britain, S.; Dent, W. (2013-09-12) - Journal article
    Context. Circumstellar disc evolution is paramount for the understanding of planet formation. The gas in protoplanetary discs large program (GASPS) aims at determining the circumstellar gas and solid mass around ~250 ...
  • [OI] disk emission in the Taurus star-forming region 

    Aresu, G.; Kamp, I.; Meijerink, R.; Spaans, M.; Vicente, S.; Podio, L.; Woitke, P.; Menard, F.; Thi, W.-F.; Güdel, M.; Liebhart, A. (2014-06-01) - Journal article
    Context. The structure of protoplanetary disks is thought to be linked to the temperature and chemistry of their dust and gas. Whether the disk is flat or flaring depends on the amount of radiation that it absorbs at a ...
  • On the structure of the transition disk around TW Hydrae 

    Menu, J.; Van Boekel, R.; Henning, T.; Chandler, C.J.; Linz, H.; Benisty, M.; Lacour, S.; Min, M.; Waelkens, C.; Andrews, S.M.; Calvet, N.; Carpenter, J.M.; Corder, S.A.; Deller, A.T.; Greaves, J.S.; Harris, R.J.; Isella, A.; Kwon, W.; Lazio, J.; Le Bouquin, J.-B.; Ménard, F.; Mundy, L.G.; Pérez, L.M.; Ricci, L.; Sargent, A.I.; Storm, S.; Testi, L.; Wilner, D.J. (2014-04-14) - Journal article
    Context. For over a decade, the structure of the inner cavity in the transition disk of TW Hydrae has been a subject of debate. Modeling the disk with data obtained at different wavelengths has led to a variety of proposed ...