Browsing by Author "Wahhaj, Zahed"

Now showing items 1-6 of 6

    • Fast-moving features in the debris disk around AU Microscopii 
      Boccaletti, Anthony; Thalmann, Christian; Lagrange, Anne Marie; Janson, Markus; Augereau, Jean Charles; Schneider, Glenn; Milli, Julien; Grady, Carol; Debes, John; Langlois, Maud; Mouillet, David; Henning, Thomas; Dominik, Carsten; Maire, Anne-Lise; Beuzit, Jean-Luc; Carson, Joseph; Dohlen, Kjetil; Engler, Natalia; Feldt, Markus; Fusco, Thierry; Ginski, Christian; Girard, Julien H.; Hines, Dean; Kasper, Markus; Mawet, Dimitri; Ménard, Francois; Meyer, Michael R.; Moutou, Claire; Olofsson, Johan; Rodigas, Timothy; Sauvage, Jean Francois; Schlieder, Joshua; Martin Schmid, Hans; Turatto, Massimo; Udry, Stephane; Vakili, Farrokh; Vigan, Arthur; Wahhaj, Zahed; Wisniewski, John (Nature Publishing, 2015)
      In the 1980s, excess infrared emission was discovered around main-sequence stars; subsequent direct-imaging observations revealed orbiting disks of cold dust to be the source(1). These 'debris disks' were thought to be ...
    • Imaging of interactions between circumstellar disks and extrasolar planets 
      Christiaens, Valentín André (Universidad de Chile, 2018)
      Se necesitan observaciones para restringir los mecanismos involucrados en el proceso de formación de planetas. Los discos circunestelares ricos en gas y polvo, llamados discos protoplanetarios, son el lugar esperado de ...
    • Improving signal-to-noise in the direct imaging of exoplanets and circumstellar disks with MLOCI 
      Wahhaj, Zahed; Cieza, Lucas; Mawet, Dimitri; Yang, Bin; Canovas, Héctor; Boer, Jozua de; Casassus Montero, Simón; Ménard, Francois; Schreiber, Matthias; Liu, Michael; Biller, Beth; Nielsen, Eric; Hayward, Thomas (EDP Sciences, 2015)
      We present a new algorithm designed to improve the signal-to-noise ratio (S/N) of point and extended source detections around bright stars in direct imaging data. One of our innovations is that we insert simulated point ...
    • Lessons learned from SPHERE for the astrometric strategy of the next generation of exoplanet imaging instruments 
      Maire, Anne-Lise; Langlois, Maud; Delorme, Philippe; Chauvin, Gael; Gratton, Raffaele; Vigan, Arthur; Girard, Julien H.; Wahhaj, Zahed; Pott, Jorg-Uwe; Burtscher, Leonard; Boccaletti, Anthony; Carlotti, Alexis; Henning, Thomas; Kenworthy, Matthew A.; Kervella, Pierre; Rickman, Emily L.; Schmidt, Tobias O. B. (Spie-Soc Photo-Optical Instrumentation Engineers, 2021)
      Measuring the orbits of directly imaged exoplanets requires precise astrometry at the milliarcsec level over long periods of time due to their wide separation to the stars (greater than or similar to 10 au) and long orbital ...
    • On the nature of the tertiary companion to FW Tau: ALMA CO observations and SED modeling 
      Cáceres, Claudio; Hardy, Adam; Schreiber, Matthias R.; Cánovas, Héctor; Cieza, Lucas A.; Williams, Jonathan P.; Hales, Antonio; Pinte, Christophe; Ménard, Francois; Wahhaj, Zahed (IOP Publishing, 2015)
      It is thought that planetary mass companions may form through gravitational disk instabilities or core accretion. Identifying such objects in the process of formation would provide the most direct test for the competing ...
    • Probing the final stages of protoplanetary disk evolution with ALMA 
      Hardy, Adam; Cáceres, C.; Schreiber, Matthias R.; Cieza González, Lucas; Alexander, R. D.; Cánovas, H.; Williams, Jonathan P.; Wahhaj, Zahed; Ménard, Francois (EDP Sciences, 2015)
      Context. The evolution of a circumstellar disk from its gas-rich protoplanetary stage to its gas-poor debris stage is not understood well. It is apparent that disk clearing progresses from the inside-out on a short time ...