Browsing by Subject "Circumstellar matter"

Now showing items 1-20 of 50

    • A direct imaging survey of spitzer-detected debris disks: occurrence of giant planets in dusty systems 
      Meshkat, Tiffany; Mawet, Dimitri; Bryan, Marta L.; Hinkley, Sasha; Bowler, Brendan P.; Stapelfeldt, Karl R.; Batygin, Konstantin; Padgett, Deborah; Morales, Farisa Y.; Serabyn, Eugene; Christiaens, Valentin; Brandt, Timothy D.; Wahhaj, Zahed (IOP Publishing Ltd., 2017)
      We describe a joint high-contrast imaging survey for planets at the Keck and Very Large Telescope of the last large sample of debris disks identified by the Spitzer Space Telescope. No new substellar companions were ...
    • A family portrait of disk inner rims around Herbig Ae/Be stars. Hunting for warps, rings, self shadowing, ... 
      Kluska, J.; Berger, J. P.; Malbet, F.; Lazareff, B.; Benisty, Myriam; Le Bouquin, J. B.; Absil, O.; Baron, F.; Delboulbé, A.; Duvert, G.; Isella, A.; Jocou, L.; Juhasz, A.; Kraus, S.; Lachaume, R.; Ménard, F.; Millan-Gabet, R.; Monnier, J. D.; Moulin, T.; Perraut, K.; Rochat, S.; Pinte, C.; Soulez, F.; Tallon, M.; Thi, W. F.; Thiébaut, E.; Traub, W.; Zins, G. (EDP Sciences, 2020)
      Context. The innermost astronomical unit (au) in protoplanetary disks is a key region for stellar and planet formation, as exoplanet searches have shown a large occurrence of close-in planets that are located within the ...
    • A gap in the planetesimal disc around HD 107146 and asymmetric warm dust emission revealed by ALMA 
      Marino, S.; Carpenter, J.; Wyatt, M.; Booth, M.; Casassus Montero, Simón; Faramaz, V.; Guzman, V.; Hughes, A.; Isella, A.; Kennedy, G.; Matra, L.; Ricci, L.; Corder, S. (Oxford University Press, 2018)
      While detecting low mass exoplanets at tens of au is beyond current instrumentation, debris discs provide a unique opportunity to study the outer regions of planetary systems. Here we report new ALMA observations of the ...
    • A low-mass stellar companion to the young variable star RZ Psc 
      Kennedy, Grant M.; Ginski, Christian; Kenworthy, Matthew A.; Benisty, Myriam; Henning, Thomas; van Holstein, Rob G.; Kral, Quentin; Ménard, Francois; Milli, Julien; Quiroga Núñez, Luis Henry; Rab, Christian; Stolker, Tomas; Sturm, Ardjan (Oxford, 2020)
      RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest that the dimming events do not probe a ...
    • A proposed new diagnostic for Herbig disc geometry FWHM versus J of CO ro-vibrational lines 
      Bertelsen, R.; Kamp, I.; Van der Plas, Gerrit; Van der Ancker, M. E.; Waters, L. B. F. M.; Thi, W. F.; Woitke, P. (EDP Sciences, 2016)
      Aims. The CO ro-vibrational lines observed from Herbig group II discs are often seen to be broad, while the same lines observed from group I discs are often narrow. This difference is not well understood. In this paper we ...
    • ALMA 1.3 mm map of the HD 95086 system 
      Su, Kate Y. L.; MacGregor, Meredith A.; Booth, Mark; Wilner, David J.; Flaherty, Kevin; Hughes, A. Meredith; Phillips, Neil M.; Malhotra, Renu; Hales, Antonio S.; Morrison, Sarah; Ertel, Steve; Matthews, Brenda C.; Dent, William R. F.; Casassus Montero, Simón (IOP Publishing Ltd., 2017)
      Planets and minor bodies such as asteroids, Kuiper-Belt objects, and comets are integral components of a planetary system. Interactions among them leave clues about the formation process of a planetary system. The signature ...
    • ALMA discovery of dust belts around proxima centauri 
      Anglada, Guillem; Amado, Pedro J.; Ortiz, Jose L.; Berdinas, Zaira M.; Jenkins, James Stewart (IOP Publishing Ltd., 2017)
      Proxima Centauri, the star closest to our Sun, is known to host at least one terrestrial planet candidate in a temperate orbit. Here we report the Atacama Large Millimeter/submillimeter Array (ALMA) detection of the star ...
    • ALMA observations of the nearby AGB star L-2 Puppis I. Mass of the central star and detection of a candidate planet 
      Kervella, Pierre; Richards, A. M. S.; Decin, L.; McDonald, I.; Montargès, M.; Ohnaka, K. (EDP Sciences, 2016)
      Six billion years from now, while evolving on the asymptotic giant branch (AGB), the Sun will metamorphose from a red giant into a beautiful planetary nebula. This spectacular evolution will impact the solar system planets, ...
    • ALMA observations of the nearby AGB star L2 Puppis II. Gas disk properties derived from 12CO and 13CO J = ... 
      Homan, Ward; Richards, Anita; Decin, Leen; Kervella, Pierre; Koter, Alex de; McDonald, Iain; Ohnaka, Keiichi (EDP Sciences, 2017-05)
      The circumstellar environment of the AGB star L-2 Puppis was observed with ALMA in cycle 3, with a resolution of 15 x 18 mas. The molecular emission shows a differentially rotating disk, inclined to a nearly edge-on position. ...
    • ALMA observations of the Th 28 protostellar disk A new example of counter-rotation between disk and optical jet 
      Louvet, Fabien; Dougados, Catherine; Cabrit, S.; Hales, A.; Pinte, Christophe; Ménard, F.; Bacciotti, F.; Coffey, D.; Mardones Pérez, Diego; Bronfman Aguiló, Leonardo; Gueth, F. (EDP Sciences, 2016)
      Aims. Recently, differences in Doppler shifts across the base of four close classical T Tauri star jets have been detected with the HST in optical and near-ultraviolet (NUV) emission lines, and these Doppler shifts were ...
    • Atomic gas in debris discs 
      Hales, Antonio S.; Barlow, M. J.; Crawford, I. A.; Casassus Montero, Simón (Oxford University, 2017)
      We have conducted a search for optical circumstellar absorption lines in the spectra of 16 debris disc host stars. None of the stars in our sample showed signs of emission line activity in either Hα, CaII or Na I, confirming ...
    • Azimuthal asymmetries in the debris disk around HD61005 A massive collision of planetesimals? 
      Olofsson, J.; Samland, M.; Avenhaus, Henning; Cáceres, C.; Henning, Thomas; Moor, A.; Milli, Julien; Cánovas, Héctor; Quanz, Sascha; Schreiber, Matthias; Augereau, J. C.; Bayo, A.; Bazzon, A.; Beuzit, J.L.; Boccaletti, Anthony; Buenzli, E.; Casassus Montero, Simón; Chauvin, G.; Dominik, C.; Desidera, S.; Feldt, M.; Gratton, R.; Janson, M.; Lagrange, Anne Marie; Langlois, Maud; Lannier, J.; Maire, Anne-Lise; Mesa, D.; Pinte, Christophe; Rouan, D.; Salter, G.; Thalmann, Christian; Vigan, A. (EDP Sciences, 2016)
      Context. Debris disks off er valuable insights into the latest stages of circumstellar disk evolution, and can possibly help us to trace the outcomes of planetary formation processes. In the age range 10 to 100 Myr, most ...
    • Cepheid distances from the SpectroPhoto-Interferometry of Pulsating Stars (SPIPS) Application to the ... 
      Mérand, A.; Kervella, Pierre; Breitfelder, J.; Gallenne, A.; Coudé du Foresto, V.; Brummelaar, T. A. ten; McAlister, H. A.; Ridgway, S.; Sturmann, L.; Sturmann, J.; Turner, N. H. (EDP Sciences, 2015)
      Context. The parallax of pulsation, and its implementations such as the Baade-Wesselink method and the infrared surface brightness technique, is an elegant method to determine distances of pulsating stars in a quasi-geometrical ...
    • Chemical composition of the circumstellar disk around AB Aurigae 
      Pacheco Vázquez, S.; Fuente, A.; Agúndez, M.; Pinte, Christophe; Alonso Albi, T.; Neri, R.; Cernicharo, J.; Goicoechea, J. R.; Berné, O.; Wiesenfeld, L.; Bachiller, R.; Lefloch, B. (ESO, 2015)
      Aims. Our goal is to determine the molecular composition of the circumstellar disk around AB Aurigae (hereafter, AB Aur). AB Aur is a prototypical Herbig Ae star and the understanding of its disk chemistry is paramount for ...
    • Does the presence of planets affect the frequency and properties of extrasolar kuiper belts? Results from ... 
      Moro Martín, A.; Marshall, J. P.; Kennedy, G.; Sibthorpe, B.; Mattheus, B. C.; Eiroa, C.; Wyatt, M. C.; Lestrade, J. F.; Maldonado, J.; Rodríguez, D.; Greaves, J. S.; Montesinos, B.; Mora, A.; Booth, M.; Duchene, G.; Wilner, D.; Horner, J. (The American Astronomical Society, 2015)
      The study of the planet–debris disk connection can shed light on the formation and evolution of planetary systemsand may help “predict” the presence of planets around stars with certain disk characteristics. In preliminary ...
    • A double plateau and unprecendented circumstellar variable sodium in the transient SN 2011A 
      De Jaeger, Thomas; Anderson, J.; Pignata Libralato, Giuliano; Hamuy Wackenhut, Mario (International Astronomical Union, 2013)
      We present optical photometry and spectrosopy of the transient SN 2011A. Our data spans 140 days after discovery including BVRIu’g’r’i’z’ photometry and a sequence of 11 spectra. First classified as a type IIn supernova ...
    • The dust disk and companion of the nearby AGB star L-2 Puppis SPHERE/ZIMPOL polarimetric imaging at visible ... 
      Kervella, Pierre; Montargès, M.; Lagadec, E.; Ridgway, S. T.; Haubois, X.; Girard, J. H.; Ohnaka, K.; Perrin, G.; Gallenne, A. (ESO, 2015)
      The bright southern star L-2 Pup is a particularly prominent asymptotic giant branch (AGB) star, located at a distance of only 64 pc. We report new adaptive optics observations of L2 Pup at visible wavelengths with 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 ...
    • Mid-infrared circumstellar emission of the long-period Cepheid Carinae resolved with VLTI/MATISSE 
      Hocdé, V.; Nardetto, N.; Matter, A.; Lagadec, E.; Mérand, A.; Cruzalèbes, P.; Meilland, A.; Millour, F.; Lopez, B.; Berio, P.; Weigelt, G.; Petrov, R.; Isbell, J.W.; Jaffe, W.; Kervella, P.; Glindemann, A.; Schöller, M.; Allouche, F.; Gallenne, Alexandre; De Souza, A. Domiciano; Niccolini, G.; Kokoulina, E.; Varga, J.; Lagarde, S.; Augereau, J.C.; Van Boekel, R.; Bristow, P.; Henning, Th.; Hofmann, K.-H.; Zins, G.; Danchi, W.-C; Delbo, M.; Dominik, C.; Gámez Rosas, V.; Klarmann, L.; Hron, J.; Hogerheijde, M. R.; Meisenheimer, K.; Pantin, E.; Paladini, C.; Robbe Dubois, S.; Schertl, D.; Stee, P.; Waters, R.; Lehmitz, M.; Bettonvil, F.; Heininger, M.; Bristow, P.; Woillez, J.; Wolf, S.; Yoffe, G.; Szabados, L.; Chiavassa, A.; Borgniet, S.; Breuval, L.; Javanmardi, B.; Ábrahám, P.; Abadie, S.; Abuter, R.; Accardo, M.; Adler, T.; Agócs, T.; Alonso, J.; Antonelli, P.; Böhm, A.; Bailet, C.; Bazin, G.; Beckmann, U.; Beltrán, J.; Boland, W.; Bourget, P.; Brast, R.; Bresson, Y.; Burtscher, L.; Buter, R.; Castillo, R.; Chelli, A.; Cid, C.; Clausse, J. M.; Connot, C.; Conzelmann, R.D.; Haan, M. de; Ebert, M.; Elswijk, E.; Fantei, Y.; Frahm, R.; Gabasch, A.; Garcés, E.; Girard, P.; Glazenborg, A.; Gonté, F. Y. J.; González Herrera, J. C.; Graser, U.; Guajardo, P.; Guitton, F.; Hanenburg, H.; Haubois, X.; Hubin, N.; Huerta, R.; Idserda, J.; Ives, D.; Jakob, G.; Jaskó, A.; Jochum, L.; Klein, R.; Kragt, J.; Kroes, G.; Kuindersma, S.; Labadie, L.; Laun, W.; Le Poole, R.; Leinert, C.; Lizon, J. L.; López, M.; Marcotto, A.; Mauclert, N.; Maurer, T.; Mehrgan, L. H.; Meisner, J.; Meixner, K.; Mellein, M.; Mohr, L.; Morel, S.; Mosoni, L.; Navarro, R.; Neumann, U.; Nußbaum, E.; Pallanca, L.; Pasquini, L.; Percheron, I.; Phan Duc, T.; Pott, J.U.; Pozna, E.; Ridinger, A.; Rigal, F.; Riquelme, M.; Rivinius, Th.; Roelfsema, R.; Rohloff, R. R.; Rousseau, S.; Schuhler, N.; Schuil, M.; Shabun, K.; Soulain, A.; Stephan, C.; Horst, R. ter; Tromp, N.; Vakili, F.; Van Duin, A.; Venema, L.B.; Vinther, J.; Wittkowski, M.; Wrhel, F. (EDP Sciences, 2021)
      Context. The nature of circumstellar envelopes (CSEs) around Cepheids is a matter of ongoing debate. The physical origin of their infrared (IR) excess could be shown to either be made up of a shell of ionized gas, a dust ...
    • Millimeter spectral indices and dust trapping by planets in brown dwarf disks 
      Pinilla, P.; Quiroga Núñez, L. H.; Benisty, Myriam; Natta, A.; Ricci, L.; Henning, Thomas; Van der Plas, Gerrit; Birnstiel, T.; Testi, L.; Ward Duon, K. (IOP Publishing Ltd, 2017)
      Disks around brown dwarfs (BDs) are excellent laboratories to study the first steps of planet formation in cold and low-mass disk conditions. The radial-drift velocities of dust particles in BD disks higher than in disks ...