Browsing by Subject "Accretion"

Now showing items 1-20 of 26

    • A bright inner disk and structures in the transition disk around the very low-mass star CIDA1 
      Pinilla, P.; Kurtovic, N. T.; Benisty, Myriam; Manara, C. F.; Natta, A.; Sanchis, E.; Tazzari, M.; Stammler, S. M.; Ricci, L.; Testi, L. (EDP Sciences, 2021)
      The frequency of Earth-sized planets in habitable zones appears to be higher around M-dwarfs, making these systems exciting laboratories to investigate planet formation. Observations of protoplanetary disks around very ...
    • A highly non-keplerian protoplanetary disc spiral structure in the gas disc of CQ tau 
      Wölfer, L.; Facchini, S.; Kurtovic, N. T.; Teague, R.; Van Dishoeck, E. F.; Benisty, Myriam; Ercolano, B.; Lodato, G.; Miotello, A.; Rosotti, G.; Testi, L.; Ubeira Gabellini, M. G. (EDP Sciences, 2021)
      Context. In recent years high-angular-resolution observations have revealed that circumstellar discs appear in a variety of shapes with diverse substructures being ubiquitous. This has given rise to the question of whether ...
    • A highly settled disk around Oph163131 
      Villenave, M.; Stapelfeldt, K. R.; Duchêne, G.; Ménard, F.; Lambrechts, M.; Sierra Morales, Anibal; Flores, C.; Dent, W. R. F.; Wolff, S.; Ribas, A.; Benisty, Myriam; Cuello, N.; Pinte, C. (IOP, 2022)
      High dust density in the midplane of protoplanetary disks is favorable for efficient grain growth and can allow fast formation of planetesimals and planets, before disks dissipate. Vertical settling and dust trapping in ...
    • Active galactic nuclei at z ∼ 1.5 – III. Accretion discs and black hole spin 
      Capellupo, Daniel; Netzer, Hagai; Lira Teillery, Paulina; Trakhtenbrot, Benny; Mejía Restrepo, Julián (Oxford University Press, 2016)
      This is the third paper in a series describing the spectroscopic properties of a sample of 39 AGN at z similar to 1.5, selected to cover a large range in black hole mass (M-BH) and Eddington ratio (L/L-Edd). In this paper, ...
    • ALMA survey of Orion planck galactic cold clumps (ALMASOP): evidence for a molecular jet launched at an ... 
      Dutta, Somnath; Lee, Chin-Fei; Hirano, Naomi; Liu, Tie; Johnstone, Doug; Liu, Sheng-Yuan; Tatematsu, Ken'ichi; Goldsmith, Paul F.; Sahu, Dipen; Evans, Neal J.; Sanhueza, Patricio; Kwon, Woojin; Qin, Sheng-Li; Samal, Manash Ranjan; Zhang, Qizhou; Kim, Kee-Tae; Shang, Hsien; Lee, Chang Won; Moraghan, Anthony; Jhan, Kai-Syun; Li, Shanghuo; Lee, Jeong-Eun; Traficante, Alessio; Juvela, Mika; Bronfman Aguiló, Leonardo Jaime; Eden, David; Soam, Archana; He, Jinhua; Liu, Hong-li; Kuan, Yi-Jehng; Pelkonen, Veli-Matti; Luo, Qiuyi; Yi, Hee-Weon; Hsu, Shih-Ying (IOP, 2022)
      Protostellar outflows and jets play a vital role in star formation as they carry away excess angular momentum from the inner disk surface, allowing the material to be transferred toward the central protostar. Theoretically, ...
    • An inner warp in the DoAr 44 T Tauri transition disc 
      Casassus Montero, Simón; Avenhaus, Henning; Pérez, Sebastián; Navarro, Víctor; Cárcamo, Miguel; Marino, Sebastián; Cieza, Luca; Quanz, Sascha P.; Alarcón, Felipe; Zurlo, Alice; Osses Alvarado, Axel; Rannou, Fernando R.; Román, Pablo E.; Barraza, Marcelo (Oxford University Press, 2018-07)
      Optical/IR images of transition discs (TDs) have revealed deep intensity decrements in the rings of HAeBes HD 142527 and HD 100453 that can be interpreted as shadowing from sharply tilted inner discs, such that the outer ...
    • Circumbinary, not transitional: on the spiral arms, cavity, shadows, fast radial flows, streamers, and ... 
      Price, Daniel J.; Cuello, Nicolás; Pinte, Christophe; Mentiplay, Daniel; Casassus Montero, Simón; Christiaens, Valentin; Kennedy, Grant M.; Cuadra, Jorge; Pérez M., Sebastián; Marino, Sebastian; Armitage, Philip J.; Zurlo, Alice; Juhasz, Attila; Ragusa, Enrico; Laibe, Guillaume; Lodato, Giuseppe (Oxford University Press, 2018)
      We present 3D hydrodynamical models of the HD 142527 protoplanetary disc, a bright and well-studied disc that shows spirals and shadows in scattered light around a 100 au gas cavity, a large horseshoe dust structure in mm ...
    • Classical T-Tauri stars with VPHAS+: II: NGC6383 in Sh 2-012 
      Kalari, V. M. (Oxford Univ Press, 2019)
      This paper presents optical (ugriH alpha)-infrared (JHKs, 3.6-8.0 mu m) photometry and Gaia astrometry of 55 Classical T-Tauri stars (CTTS) in the star-forming region Sh 2-012 and its central cluster NGC6383. The sample ...
    • Cooling in the shade of warped transition discs 
      Casassus Montero, Simón; Pérez, Sebastián; Osses, Axel; Marino, Sebastián (Oxford University Press, 2019)
      © 2019 The Author(s).The mass of the gaseous reservoir in young circumstellar discs is a crucial initial condition for the formation of planetary systems, but estimates vary by orders of magnitude. In some discs with ...
    • Erratum: Cooling in the shade of warped transition disks 
      Casassus Montero, Simón; Pérez, Sebastián; Osses Alvarado, Axel; Marino, Sebastián (Oxford University Press, 2020)
      This is an Erratum to the paper ‘Cooling in the shade of warped transition disks’ that was published in MNRAS, 486, L58-L62 (2019). The x-axis of Fig. 1 in the original version of the paper is incorrectly labeled, the ...
    • Homogeneous analysis of the dust morphology of transition disks observed with ALMA: investigating dust ... 
      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 ...
    • Investigating the magnetospheric accretion process in the young pre-transitional disk system DoAr 44 (V2062 ... 
      Bouvier, J.; Alecian, E.; Alencar, S. H. P.; Sousa, A.; Donati, J. F.; Perraut, K.; Bayo, A.; Rebull, L. M.; Dougados, C.; Duvert, G.; Berger, J. P.; Benisty, M.; Pouilly, K.; Folsom, C.; Moutou, C. (EDP, 2020)
      Context. Young stars interact with their accretion disk through their strong magnetosphere.Aims. We aim to investigate the magnetospheric accretion/ejection process in the young stellar system DoAr 44 (V2062 Oph).Methods. ...
    • Massive protostars in a protocluster-a multi-scale ALMA view of G35.20-0.74N 
      Zhang, Yichen; Tanaka, Kei E. I.; Tan, Jonathan C.; Yang, Yao-Lun; Greco, Eva; Beltrán, María T.; Sakai, Nami; De Buizer, James M.; Rosero, Viviana; Fedrian, Rubén; Garay Brignardello, Guido Alejandro (IOP, 2022)
      We present a detailed study of the massive star-forming region G35.2-0.74N with Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm multi-configuration observations. At 0.'' 2 (440 au) resolution, the continuum ...
    • Molecules with ALMA at Planet-forming Scales (MAPS). IV. Emission Surfaces and Vertical Distribution of Molecules 
      Law, Charles J.; Teague, Richard; Loomis, Ryan A.; Bae, Jaehan; Oberg, Karin; Czekala, Ian; Andrews, Sean M.; Aikawa, Yuri; Alarcón, Felipe; Bergin, Edwin A.; Bergner, Jennifer B.; Booth, Alice S.; Bosman, Arthur D.; Calahan, Jenny K.; Cataldi, Gianni; Cleeves, Ilsedore; Furuya, Kenji; Guzmán, Viviana V.; Huang, Jane; Ilee, John D.; Le Gal, Romane; Liu, Yao; Long, Feng; Menard, Francois; Nomura, Hideko; Pérez Muñoz, Laura; Qi, Chunhua; Schwarz, Kamber R.; Soto, Daniela; Tsukagoshi, Takashi; Yamato, Yoshihide; Van 't Hoff, Merel L. R.; Walsh, Catherine; Wilner, David J.; Zhang, Ke (IOP, 2021)
      The Molecules with ALMA at Planet-forming Scales (MAPS) Large Program provides a unique opportunity to study the vertical distribution of gas, chemistry, and temperature in the protoplanetary disks around IM Lup, GM Aur, ...
    • Molecules with ALMA at Planet-forming Scales (MAPS). V. CO Gas Distributions 
      Zhang, Ke; Booth, Alice S.; Law, Charles J.; Bosman, Arthur D.; Schwarz, Kamber R.; Bergin, Edwin A.; Oberg, Karin; Andrews, Sean M.; Guzmán, Viviana V.; Walsh, Catherine; Qi, Chunhua; van 't Hoff, Merel L. R.; Long, Feng; Wilner, David J.; Huang, Jane; Czekala, Ian; Ilee, John D.; Cataldi, Gianni; Bergner, Jennifer B.; Aikawa, Yuri; Teague, Richard; Bae, Jaehan; Loomis, Ryan A.; Calahan, Jenny K.; Alarcón, Felipe; Menard, Francois; Le Gal, Romane; Sierra, Aníbal; Yamato, Yoshihide; Nomura, Hideko; Tsukagoshi, Takashi; Pérez Muñoz, Laura; Trapman, León; Liu, Yao; Furuya, Kenji (IOP, 2021)
      Here we present high-resolution (15–24 au) observations of CO isotopologue lines from the Molecules with ALMA on Planet-forming Scales (MAPS) ALMA Large Program. Our analysis employs observations of the (J = 2–1) and (1–0) ...
    • A New Look at Quasar Accretion Disks 
      Capellupo, Daniel M.; Netzer, Hagai; Lira Teillery, Paulina; Trakhtenbrot, Benny; Mejía Restrepo, Julián (International Astronomical Union, 2013)
      The physics of active black holes (BHs) is governed by three key parameters: their mass, spin, and accretion rate. Understanding the cosmic evolution of these parameters is crucial for tracing back the growth of the BHs ...
    • Particle-in-Cell Simulations of Continuosly Driven Mirror and Ion cycloton Instability in High Beta ... 
      Riquelme Hernández, Mario; Quataert, Eliot; Verscharen, Daniel (American Astronomical Society, 2015)
      We use particle-in-cell simulations to study the nonlinear evolution of ion velocity space instabilities in an idealized problem in which a background velocity shear continuously amplifies the magnetic field. We simulate the ...
    • Pic simulations of the effect of velocity space instabilities on electron viscosity and thermal conduction 
      Riquelme Hernández, Mario; Quataert, Eliot; Verscharen, Daniel (IOP Publishing, 2016)
      In low-collisionality plasmas, velocity-space instabilities are a key mechanism providing an effective collisionality for the plasma. We use particle-in-cell (PIC) simulations to study the interplay between electron-and ...
    • Precession and accretion in circumbinary discs: the case of HD 104237 
      Dunhill, A. C.; Cuadra, J.; Dougados, Catherine (Royal Astronomical Society, 2015)
      We present the results of smoothed particle hydrodynamics (SPH) simulations of the disc around the young, eccentric stellar binary HD 104237. We find that the binary clears out a large cavity in the disc, driving a ...
    • Publisher Note: Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, ... 
      Price, Daniel J.; Cuello, Nicolás; Pinte, Christophe; Mentiplay, Daniel; Casassus Montero, Simón; Christiaens, Valentin; Kennedy, Grant M.; Cuadra, Jorge; Sebastian Perez, M.; Marino, Sebastian; Armitage, Philip J.; Zurlo, Alice; Csendes Juhasz, Attila; Ragusa, Enrico; Laibe, Guillaum (Oxford University Press, 2018)