Browsing by Author "Casassus Montero, Simón"

Now showing items 21-40 of 41

    • Interstellar (12)C/(13)C ratios through CH(+) lambda lambda 3957,4232 absorption in local clouds: incomplete ... 
      Casassus Montero, Simón; Stahl, O.; Wilson, T. L. (EDP SCIENCES S A, 2005-10)
      The (12)C/(13)C isotope ratio is a tracer of stellar yields and the efficiency of mixing in the ISM. (12)CH(+)/(13)CH(+) is not affected by interstellar chemistry, and is the most secure way of measuring (12)C/(13)C in the ...
    • Molecular Gas Clumps from the Destruction of Icy Bodies in the β Pictoris Debris Disk 
      Dent, William R. F.; Wyatt, M. C.; Roberge, A.; Augereau, J. C.; Casassus Montero, Simón; Corder, C.; Greaves, J. S.; De Gregorio Monsalvo, Itziar; Hales, A.; Jackson, A. P.; Meredith Hughes, A.; Lagrange, Anne Marie; Matthews, B.; Wilner, D. (2014-03-28)
      Many stars are surrounded by disks of dusty debris formed in the collisions of asteroids, comets, and dwarf planets, but is gas also released in such events? Observations at submillimeter wavelengths of the archetypal ...
    • Morphological analysis of the centimeter-wave continuum in the dark cloud LDN 1622 
      Casassus Montero, Simón; Cabrera, G. F.; Förster, Francisco; Pearson, Timothy J.; Readhead, A. C. S.; Dickinson, Clive (UNIV CHICAGO PRESS, 2006-03-10)
      The spectral energy distribution of the dark cloud LDN 1622, as measured by Finkbeiner using WMAP data, drops above 30 GHz and is suggestive of a Boltzmann cutoff in grain rotation frequencies, characteristic of spinning ...
    • Physical conditions and kinematics in protoplanetary disks through line emission 
      Alarcón Peña, Felipe Mauricio (Universidad de Chile, 2019)
      Planetary Sciences are constantly progressing. Current facilities have allowed the discovery of a considerable amount of exoplanets and a more detailed study of protoplanetary disks, which is where planets are thought to ...
    • Planck intermediate results. XVIII. The millimetre and sub-millimetre emission from planetary nebulae 
      Arnaud, M.; Atrio-Barandela, F.; Aumont, J.; Baccigalupi, C.; Banday, A.; Barreiro, R.; Battaner, E.; Benabed, K.; Benoit-Lévy, A.; Bernard, J. P.; Bersanelli, M.; Bielewicz, P.; Bonaldi, A.; Bond, J. R.; Borrill, J.; Bouchet, F.; Buemi, C. S.; Burigana, C.; Cardoso, J.; Casassus Montero, Simón; Catalano, A.; Cerrigone, L.; Chamballu, A.; Chiang, H.; Colombi, S.; Colombo, L.; Couchot, F.; Crill, B.; Curto, A.; Cuttaia, F.; Davies, R. D.; Davis, R. J.; Bernardis, P. de; Rosa, A. de; Zotti, G. de; Delabrouille, J.; Dickinson, C.; Diego, J.; Donzelli, S.; Doré, O.; Dupac, X.; Enblin, T. A.; Eriksen, H. K.; Finelli, F.; Frailis, M.; Franceschi, E.; Galeotta, S.; Ganga, K.; Giard, M.; González-Nuevo, J.; Górski, K.; Gregorio, A.; Gruppuso, A.; Hansen, F.; Harrison, D.; Hildebrandt, S. R.; Hivon, E.; Holmes, W.; Hora, J. L.; Hornstrup, A.; Hovest, W.; Huffenberger, K. M.; Jaffe, T.; Jones, W.; Juvela, M.; Keihänen, E.; Keskitalo, R.; Kisner, T.; Knoche, J.; Kunz, M.; Kurki-Suonio, H.; Lähteenmäki, A.; Lamarre, J.-M.; Lasenby, A.; Lawrence, C. R.; Leonardi, R.; Leto, P.; Lilje, P.; Linden-Vornle, M.; López-Caniego, M.; Macías-Pérez, J.; Maffei, B.; Maino, D.; Mandolesi, N.; Martin, P. G.; Masi, S.; Massardi, M.; Matarrese, S.; Mazzotta, P.; Mendes, L.; Mennella, A.; Migliaccio, M.; Miville-Deschênes, M.-A.; Moneti, A.; Montier, L.; Morgante, G.; Mortlock, D.; Munshi, D.; Murphy, J.; Naselsky, P.; Nati, F.; Natoli, P.; Noviello, F.; Novikov, D.; Novikov, I.; Pagano, L.; Pajot, F.; Paladini, R.; Paoletti, D.; Peel, Murray C.; Perdereau, O.; Perrotta, F.; Piacentini, F.; Piat, M.; Pietrobon, D.; Plaszczynski, S.; Pointecouteau, E.; Polenta, G.; Popa, L.; Pratt, G. W.; Procopio, P.; Prunet, S.; Puget, J.-L.; Rachen, J.; Reinecke, M.; Remazeilles, M.; Ricciardi, S.; Riller, T.; Ristorcelli, I.; Rocha, G.; Rosset, C.; Roudier, G.; Rubiño-Martín, J.; Rusholme, B.; Sandri, M.; Savini., G.; Scott, D.; Spencer, L.; Stolyarov, V.; Sutton, D.; Suur-Uski, A.-S.; Sygnet, J.; Tauber, J. A.; Terenzi, L.; Toffolatti, L.; Tomasi, M.; Trigilio, C.; Tristram, M.; Trombetti, T.; Tucci, M.; Umana, G.; Valiviita, J.; Van Tent, B.; Vielva, P.; Villa, F.; Wade, L.; Wandelt, B.; Zacchei, A.; Zijlstra, A.; Zonca, A. (EDP Sciences, 2015)
      Late stages of stellar evolution are characterized by copious mass-loss events whose signature is the formation of circumstellar envelopes (CSE). Planck multi-frequency measurements have provided relevant information on ...
    • Radiative transfer in protoplanetary discs 
      Martínez Brunner, Rafael José (Universidad de Chile, 2022)
      Gracias a los importantes avances tecnológicos, el estudio de los discos protoplanetarios se ha desarrollado rápidamente en las dos últimas décadas. Con instrumentos cada vez mejores, observatorios como ALMA y el VLT han ...
    • Resolved carbon monoxide observations of protoplanetary discs in ophiuchus 
      Antilén Romero, Juanita Andrea (Universidad de Chile, 2022)
      The $^{12}$CO rotational lines in protoplanetary discs are good tracers of the total spatial extension of the gas component and potentially planet-disc interactions. This work analyses ALMA long-baseline observations of ...
    • Shadows Cast by a Warp in the HD 142527 Protoplanetary Disk 
      Marino Estay, Sebastián; Pérez, Sebastián; Casassus Montero, Simón (The American Astronomical Society, 2015-01-10)
      Detailed observations of gaps in protoplanetary disks have revealed structures that drive current research on circumstellar disks. One such feature is the two intensity nulls seen along the outer disk of the HD 142527 ...
    • Sparse aperture masking observations of the FL Cha pre-transitional disk 
      Cieza, Lucas A.; Lacour, Sylvestre; Schreiber, Matthias R.; Casassus Montero, Simón; Jordán, Andrés; Mathews, Geoffrey S.; Cánovas, Héctor; Ménard, Francois; Kraus, Adam L.; Pérez, Sebastián; Tuthill, Peter; Ireland, Michael J. (The American Astronomical Society, 2013)
      We present deep Sparse Aperture Masking (SAM) observations obtained with the ESO Very Large Telescope of the pre-transitional disk object FL Cha (SpT = K8, d = 160 pc), the disk of which is known to have a wide optically thin ...
    • 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 ...
    • Spitzer characterization of dust in an anomalous emission region: the Perseus cloud 
      Tibbs, C. T.; Flagey, N.; Paladini, R.; Compiègne, M.; Shenoy, S.; Carey, S.; Noriega Crespo, A.; Dickinson, C.; Ali Haïmoud, Y.; Casassus Montero, Simón; Cleary, K.; Davies, R. D.; Hirata, C. M.; Watson, R. A. (2011)
      Anomalous microwave emission is known to exist in the Perseus cloud. One of the most promising candidates to explain this excess of emission is electric dipole radiation from rapidly rotating very small dust grains, ...
    • STRUCTURE AND COMPOSITION OF TWO TRANSITIONAL CIRCUMSTELLAR DISKS IN CORONA AUSTRALIS 
      Hughes, A. M.; Andrews, S. M.; Wilner, D. J.; Meyer, M. R.; Carpenter, J. M.; Qi, C.; Hales, A.; Casassus Montero, Simón; Hogerheijde, M. R.; Mamajek, E. E.; Wolf, S.; Henning, Thomas; Silverstone, M. D. (IOP PUBLISHING LTD, 2010-09)
      The late stages of evolution of the primordial circumstellar disks surrounding young stars are poorly understood, yet vital to constraining theories of planet formation. We consider basic structural models for the disks ...
    • The anisotropy of the microwave background to l = 3500: Deep field observations with the cosmic background imager 
      Mason, B. S.; Pearson, T. J.; Readhead, A. C.S.; Shepherd, M. C.; Sievers, J.; Udomprasert, P. S.; Cartwright, J. K.; Farmer, A. J.; Padin, S.; Myers, S. T.; Bond, J. R.; Contaldi, C. R.; Pen, U.; Prunet, S.; Pogosyan, D.; Carlstrom, J. E.; Kovac, J.; Leitch, E. M.; Pryke. C.; Halverson, N.W.; Holzapfel, W. L.; Altamirano, P.; Bronfman Aguiló, Leonardo; Casassus Montero, Simón; May, J.; Joy, M. (Institute of Physics Publishing, 2003)
      We report measurements of anisotropy in the cosmic microwave background radiation over the multipole range l ∼ 200-3500 with the Cosmic Background Imager based on deep observations of three fields. These results confirm ...
    • The anisotropy of the microwave background to l = 3500: Mosaic observations with the cosmic background imager 
      Pearson, T. J.; Mason, B. S.; Readhead, A. C.S.; Shepherd, M. C.; Sievers, J. L.; Udomprasert, P. S.; Cartwright, J. K.; Farmer, A. J.; Padin, S.; Myers, S. T.; Bond, J. R.; Contaldi, C. R.; Pen, U. L.; Prunet, S.; Pogosyan, D.; Carlstrom, J. E.; Kovac, J.; Leitch, E. M.; Pryke. C.; Halverson, N. W.; Holzapfel, W. L.; Altamirano, P.; Bronfman Aguiló, Leonardo; Casassus Montero, Simón; May, J.; Joy, M. (Institute of Physics Publishing, 2003)
      Using the Cosmic Background Imager (CBI), a 13-element interferometer array operating in the 26-36 GHz frequency band, we have observed 40 deg 2 of sky in three pairs of fields, each ∼1457prime; × 165′, using overlapping ...
    • The dynamically disrupted GAP in HD 142527 
      Casassus Montero, Simón; Pérez M., S.; Jordán, A.; Ménard, Francois; Cuadra, J.; Schreiber, M. R.; Hales, A.; Ercolano, B. (IOP PUBLISHING LTD, 2012-08-01)
      The vestiges of planet formation have been observed in debris disks harboring young and massive gaseous giants. The process of giant planet formation is terminated by the dissipation of gas in the protoplanetary disk. The ...
    • The Galactic disc distribution of planetary nebulae with warm dust emission features - I 
      Casassus Montero, Simón; Roche, P. F.; Aitken, D. K.; Smith, C. H. (BLACKWELL SCIENCE LTD, 2001-02-01)
      We investigate the Galactic disc distribution of a sample of planetary nebulae characterized in terms of their mid-infrared spectral features. The total number of Galactic disc PNe with 8-13 mum spectra is brought up to ...
    • The Galactic disc distribution of planetary nebulae with warm dust emission features - II 
      Casassus Montero, Simón; Roche, P. F. (BLACKWELL SCIENCE LTD, 2001-02-01)
      We address the question of whether the distribution of warm-dust compositions in IR-bright Galactic disc PNe (Paper I, Casassus et al.) can be linked to the underlying stellar population. The PNe with warm dust emission ...
    • An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96] 201.663+1.643 
      Dickinson, C.; Casassus Montero, Simón; Pineda, J. L.; Pearson, T. J.; Readhead, A. C. S.; Davies, R. D. (UNIV CHICAGO PRESS, 2006-06-01)
      [ LPH96] 201.663 + 1.643, a diffuse H II region, has been reported to be a candidate for emission from rapidly spinning dust grains. We present Cosmic Background Imager (CBI) observations at 26 - 36 GHz that show no evidence ...
    • Vela X at 31 GHz 
      Hales, A. S.; Casassus Montero, Simón; Álvarez Moreno, Héctor Julio; May Humeres, Jorge; Bronfman Aguiló, Leonardo; Readhead, A. C. S.; Pearson, T. J.; Mason, B. S.; Dodson, R. (IOP PUBLISHING LTD, 2004-10-01)
      We present observations of the Vela X region at 31 GHz using the Cosmic Background Imager ( CBI). We find a strong compact radio source (5.'9 x 4.'1, FWHM) about the Vela pulsar, which we associate with the Vela pulsar ...