Browsing by Subject "circumstellar matter"

Now showing items 1-12 of 12

    • ALMA observations of anisotropic dust mass loss in the inner circumstellar environment of the red supergiant ... 
      O'Gorman, E.; Vlemmings, W.; Richards, A.; Baudry, A.; De Beck, E.; Decin, L.; Harper, G.; Humphreys, E.; Kervella, Pierre; Khouri, T.; Muller, S. (EDP Sciences, 2015)
      The processes leading to dust formation and the subsequent role it plays in driving mass loss in cool evolved stars is an area of intense study. Here we present high resolution ALMA Science Verification data of the continuum ...
    • ALMA Observations of Elias 2-24: A Protoplanetary Disk with Multiple Gaps in the Ophiuchus Molecular Cloud 
      Cieza, Lucas; Casassus Montero, Simón; Pérez, Sebastián; Hales, Antonio; Cárcamo, Miguel; Ansdell, Megan; Avenhaus, Henning; Bayo, Amelia; Bertrang, Gesa; Cánovas, Hector; Christiaens, Valentin; Dent, William; Ferrero, Gabriel; Gamen, Roberto; Olofsson, Johan; Orcajo, Santiago; Osses, Axel; Peña-Ramirez, Karla; Principe, David; Ruíz-Rodríguez, Dary; Schreiber, Matthias; Van der Plas, Gerrit; Williams, Jonathan; Zurlo, Alice (Institute of Physics Publishing, 2017)
      We present ALMA 1.3 mm continuum observations at 0."2 (25 au) resolution of Elias 2-24, one of the largest andbrightest protoplanetary disks in the Ophiuchus Molecular Cloud, and we report the presence of three partiallyresolved ...
    • The close circumstellar environment of Betelgeuse III. SPHERE/ZIMPOL imaging polarimetry in the visible 
      Kervella, Pierre; Lagadec, E.; Montarges, M.; Ridgway, S.; Chiavassa, A.; Haubois, X.; Schmid, H.; Langlois, M.; Gallenne, A.; Perrin, G. (EDP SCIENCES, 2016)
      The physical mechanism through which the outgoing material of massive red supergiants is accelerated above the escape velocity is unclear. Thanks to the transparency of its circumstellar envelope, the nearby red supergiant ...
    • A co survey in planet-forming disks: characterizing the gas content in the epoch of planet formation 
      Hales, A.; De Gregorio Monsalvo, Itziar; Montesinos, B.; Casassus Montero, Simón; Dent, William R. F.; Dougados, Catherine; Eiroa, C.; Hughes, A.M.; Garay Brignardello, Guido; Mardones Pérez, Diego; Ménard, Francois; Palau, Aina; Pérez, Sebastián; Phillips, N.; Torrelles, J. M.; Wilner, D. (The American Astronomical Society., 2014-07-31)
      We carried out a 12CO(3-2) survey of 52 southern stars with a wide range of IR excesses (L IR/L *) using the single-dish telescopes APEX and ASTE. The main aims were (1) to characterize the evolution of molecular gas in ...
    • Consistent dust and gas models for protoplanetary disks I. Disk shape, dust settling, opacities, and PAHs 
      Woitke, P.; Min, M.; Pinte, Christophe; Thi, W. F.; Kamp, I.; Rab, C.; Anthonioz, F.; Antonellini, S.; Baldovin Saavedra, C.; Carmona, A.; Dominik, C.; Dionatos, O.; Greaves, J.; Guedel, M.; Ilee, J. D.; Liebhart, A.; Menard, F.; Rigon, L.; Waters, L. B. F. M.; Aresu, G.; Meijerink, R.; Spaans, M. (EDP SCIENCES, 2016)
      We propose a set of standard assumptions for the modelling of Class II and III protoplanetary disks, which includes detailed continuum radiative transfer, thermo-chemical modelling of gas and ice, and line radiative transfer ...
    • Exocometary gas in the HD 181327 debris ring 
      Marino, S.; Matra, L.; Stark, C.; Wyatt, M. C.; Casassus Montero, Simón; Kennedy, G.; Rodríguez, D.; Zuckerman, B.; Pérez, S.; Dent, William R. F.; Kuchner, M.; Hughes, A.M.; Schneider, G.; Steele, A.; Roberge, A.; Donaldson, J.; Nesvold, E. (2016)
      An increasing number of observations have shown that gaseous debris discs are not an exception. However, until now, we only knew of cases around A stars. Here we present the first detection of (CO)-C-12 (2-1) disc emission ...
    • Resolved debris discs around A stars in the Herschel DEBRIS survey 
      Booth, Mark; Kennedy, Grant; Sibthorpe, Bruce; Matthews, Brenda C.; Wyatt, Mark C.; Duchene, Gaspard; Kavelaars, J. J.; Rodriguez, David; Greaves, Jane S.; Koning, Alice; Vican, Laura; Rieke, George H.; Su, Kate Y. L.; Moro Martín, Amaya; Kalas, Paul (Oxford University Press on behalf of the Royal Astronomical Society Downloaded from http://mnras.oxfordjournals.org/ at Universidad de Chile on January 22, 2014, 2013)
      The majority of debris discs discovered so far have only been detected through infrared excess emission above stellar photospheres. While disc properties can be inferred from unresolved photometry alone under various ...
    • Resolving the planet-hosting inner regions of the LkCa 15 disk 
      Thalmann, C.; Janson, M.; Garufi, A.; Boccaletti, A.; Quanz, S. P.; Sissa, E.; Gratton, R.; Salter, G.; Benisty, Myriam; Bonnefoy, M.; Chauvin, G.; Daemgen, S.; Desidera, S.; Dominik, C.; Engler, N.; Feldt, M.; Henning, Thomas; Lagrange, Anne Marie; Langlois, M.; Lannier, J.; Le Coroller, H.; Ligi, R.; Menard, F.; Mesa, D.; Meyer, M. R.; Mulders, G. D.; Olofsson, J.; Pinte, Christophe; Schmid, H.-M.; Vigan, A.; Zurlo, A. (2016)
      LkCa 15 hosts a pre-transitional disk as well as at least one accreting protoplanet orbiting in its gap. Previous disk observations have focused mainly on the outer disk, which is cleared inward of similar to 50 au. The ...
    • 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. ...
    • A statistical analysis of circumstellar material in Type Ia supernovae 
      Maguire, K.; Sullivan, M.; Patat, F.; Gal-Yam, A.; Hook, I. M.; Dhawan, S.; Howell, D. A.; Mazzali, P.; Nugent, P. E.; Pan, Y. C.; Podsiadlowski, P.; Simon, J. D.; Sternberg, A.; Valenti, S.; Baltay, C.; Bersier, D.; Blagorodnova, N.; Chen, T. W.; Ellman, N.; Feindt, U.; Förster, Francisco; Fraser, M.; González Gaitán, Santiago; Graham, M. L.; Gutiérrez, C.; Hachinger, S.; Hadjiyska, E.; Inserra, C.; Knapic, C.; Laher, R. R.; Leloudas, G.; Margheim, S.; McKinnon, R.; Molinaro, M.; Morrell, N.; Ofek, E. O.; Rabinowitz, D.; Rest, A.; Sand, D.; Smareglia, R.; Smartt, S. J.; Taddia, F.; Walker, E. S.; Walton, N. A.; Young, D. R. (Oxford University Press, Royal Astronomical Society, 2013)
      A key tracer of the elusive progenitor systems of Type Ia supernovae (SNe Ia) is the detection of narrow blueshifted time-varying Na I D absorption lines, interpreted as evidence of circumstellar material surrounding the ...
    • 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 Millimeter Continuum Size-Frequency Relationship in the UZ Tau E Disk 
      Tripathi, Anjali; Andrews, Sean; Birnstiel, Tilman; Chandler, Claire; Isella, Andrea; Pérez, Laura; Harris, R.; Ricci, Luca; Wilner, David; Carpenter, John; Calvet, Nuria; Corder, Stuartt; Deller, A.; Dullemond, C.; Greaves, Jane; Henning, Thomas; Kwon, W.; Lazio, J.; Linz, H.; Testi, L. (IOP Publishing, 2018-07-01)
      We present high spatial resolution observations of the continuum emission from the young multiple star system UZ Tau at frequencies from 6 to 340 GHz. To quantify the spatial variation of dust emission in the UZ Tau E ...