Browsing by Subject "Accretion disks"

Now showing items 1-13 of 13

    • 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 ...
    • 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. ...
    • MUSE reveals a recent merger in the post-starburst host galaxy of the TDE ASASSN-14li 
      Prieto, J. L.; Kruehler, T.; Anderson, J. P.; Galbany, Lluis; Kochanek, C. S.; Aquino, E.; Brown, J. S.; Dong, Subo; Forster, Francisco; Holoien, T. W.-S.; Kuncarayakti, H.; Maureira, J. C.; Rosales Ortega, F. F.; Sánchez, S. F.; Shappee, B. J.; Stanek, K. Z. (IOP Publishing, 2016)
      We present Multi Unit Spectroscopic Explorer (MUSE) integral field spectroscopic observations of the host galaxy (PGC 043234) of one of the closest (z = 0.0206, D similar or equal to 90 Mpc) and best-studied tidal disruption ...
    • 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 ...
    • Radiation hydrodynamical turbulence in protoplanetary disks: Numerical models and observational constraints 
      Flock, Mario; Nelson, Richard P.; Turner, Neal J.; Bertrang, Gesa H.-M.; Carrasco González, Carlos; Henning, Thomas; Lyra, Wladimir; Teague, Richard (IOP Publishing Ltd, 2017)
      Planets are born in protostellar disks, which are now observed with enough resolution to address questions about internal gas flows. Magnetic forces are possibly drivers of the flows, but ionization state estimates suggest ...
    • Size and structures of disks around very low mass stars in the taurus star-forming region 
      Kurtovic, N. T.; Pinilla, P.; Long, F.; Benisty, Myriam; Manara, C. F.; Natta, A.; Pascucci, I.; Ricci, L.; Scholz, A.; Testi, L. (EDP Sciences, 2021)
      Context. The discovery of giant planets orbiting very low mass stars (VLMS) and the recent observed substructures in disks around VLMS is challenging planet formation models. Specifically, radial drift of dust particles ...
    • Spiral waves triggered by shadows in transition disks 
      Montesinos, Matías; Pérez, Sebastián; Casassus Montero, Simón; Marino, Sebastián; Cuadra, Jorge; Christiaens, Valentín (IOP Publishing, 2016)
      Circumstellar asymmetries such as central warps have recently been shown to cast shadows on outer disks. We investigate the hydrodynamical consequences of such variable illumination on the outer regions of a transition ...
    • Stochastic electron acceleration by the whistler instability in a growing magnetic field 
      Riquelme Hernández, Mario; Osorio, Alvaro; Quataert, Eliot (IOP Publishing Ltd., 2017)
      We use 2D particle-in-cell simulations to study the effect of the saturated whistler instability on the viscous heating and nonthermal acceleration of electrons in a shearing, collisionless plasma with a growing magnetic ...
    • The GRAVITY young stellar object survey: IV. The CO overtone emission in 51 Oph at sub-au scales 
      Koutoulaki, M.; García López, R.; Natta, A.; Fedriani, R.; Garatti, A. Caratti O.; Ray, T. P.; Coffey, D.; Brandner, W.; Dougados, C.; García, P. J. V.; Klarmann, L.; Labadie, L.; Perraut, K.; Sánchez Bermúdez, J.; Lin, C. C.; Amorim, A.; Bauböck, M.; Benisty, Myriam; Berger, J. P.; Buron, A.; Caselli, P.; Clénet, Y.; Coudé Du Foresto, V.; De Zeeuw, P. T.; Duvert, G.; De Wit, W.; Eckart, A.; Eisenhauer, F.; Filho, M.; Gao, F.; Gendron, E.; Genzel, R.; Gillessen, S.; Grellmann, R.; Habibi, M.; Haubois, X.; Haussmann, F.; Henning, T.; Hippler, S.; Hubert, Z.; Horrobin, M.; Jiménez Rosales, A.; Jocou, L.; Kervella, P.; Kolb, J.; Lacour, S.; Le Bouquin, J. B.; Léna, P.; Linz, H.; Ott, T.; Paumard, T.; Perrin, G.; Pfuhl, O.; Ramírez Tannus, M. C.; Rau, C.; Rousset, G.; Scheithauer, S.; Shangguan, J.; Stadler, J.; Straub, O.; Straubmeier, C.; Sturm, E.; Van Dishoeck, E.; Vincent, F.; Von Fellenberg, S.; Widmann, F.; Wieprecht, E.; Wiest, M.; Wiezorrek, E.; Yazici, S.; Zins, G. (EDP Sciences, 2021)
      Context. 51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO ro-vibrational emission at 2.3 mu m, most likely originating in the innermost regions of a circumstellar disc.Aims. We aim to obtain the physical ...