R
Ronald Roelfsema
Researcher at ASTRON
Publications - 84
Citations - 6898
Ronald Roelfsema is an academic researcher from ASTRON. The author has contributed to research in topics: Exoplanet & Planet. The author has an hindex of 32, co-authored 83 publications receiving 5534 citations. Previous affiliations of Ronald Roelfsema include Nova Southeastern University & University of Groningen.
Papers
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Journal ArticleDOI
Shadows cast on the transition disk of HD 135344B. Multiwavelength VLT/SPHERE polarimetric differential imaging
Tomas Stolker,Carsten Dominik,Henning Avenhaus,Michiel Min,Michiel Min,J. de Boer,Christian Ginski,H. M. Schmid,Attila Juhasz,A. Bazzon,L. B. F. M. Waters,L. B. F. M. Waters,Antonio Garufi,Jean-Charles Augereau,Jean-Charles Augereau,Myriam Benisty,Myriam Benisty,Anthony Boccaletti,Thomas Henning,Maud Langlois,Maud Langlois,Anne-Lise Maire,François Ménard,François Ménard,Michael R. Meyer,C. Pinte,C. Pinte,Sascha P. Quanz,Christian Thalmann,J. L. Beuzit,J. L. Beuzit,Marcel Carbillet,Anne Costille,Kjetil Dohlen,Markus Feldt,D. Gisler,David Mouillet,David Mouillet,A. Pavlov,D. Perret,Cyril Petit,J. Pragt,S. Rochat,S. Rochat,Ronald Roelfsema,Bernardo Salasnich,C. Soenke,Francois Wildi +47 more
TL;DR: In this article, the authors studied the morphology and surface brightness of the disk in scattered light to gain insight into the innermost disk regions, the formation of protoplanets, planet-disk interactions traced in the surface and midplane layers, and the dust grain properties of disk surface.
Journal ArticleDOI
Shadows and spirals in the protoplanetary disk HD 100453
Myriam Benisty,Tomas Stolker,Adriana Pohl,J. de Boer,Geoffroy Lesur,Carsten Dominik,Cornelis P. Dullemond,Maud Langlois,Maud Langlois,Michiel Min,Michiel Min,Kevin Wagner,Thomas Henning,Attila Juhasz,Paola Pinilla,Paola Pinilla,Stefano Facchini,Daniel Apai,R. van Boekel,Antonio Garufi,Christian Ginski,François Ménard,Christophe Pinte,Sascha P. Quanz,Alice Zurlo,Alice Zurlo,Alice Zurlo,Anthony Boccaletti,M. Bonnefoy,Jean-Luc Beuzit,Gael Chauvin,M. Cudel,Silvano Desidera,Markus Feldt,C. Fontanive,Raffaele Gratton,M. Kasper,M. Kasper,A-M. Lagrange,H. LeCoroller,David Mouillet,Dino Mesa,E. Sissa,Arthur Vigan,Jacopo Antichi,T. Buey,Thierry Fusco,D. Gisler,M. Llored,Yves Magnard,O. Moeller-Nilsson,J. Pragt,Ronald Roelfsema,Jean-François Sauvage,Francois Wildi +54 more
TL;DR: In this article, the authors observed and spatially resolved the disk around the ~10 Myr old protoplanetary disk HD 100453 in polarized scattered light with SPHERE/VLT at optical and near-infrared wavelengths, reaching an angular resolution of ~0.02", and an inner working angle of ~ 0.09".
Proceedings ArticleDOI
Tests of the demodulating CCDs for the SPHERE / ZIMPOL imaging polarimeter
H. M. Schmid,Mark Downing,Ronald Roelfsema,Andreas Bazzon,D. Gisler,Johan Pragt,Claudio Cumani,Bernardo Salasnich,A. Pavlov,Andrea Baruffolo,Jean-Luc Beuzit,Anne Costille,S. Deiries,Kjetil Dohlen,Carsten Dominik,Eddy Elswijk,Markus Feldt,Markus Kasper,David Mouillet,Christian Thalmann,Francois Wildi +20 more
TL;DR: In this article, the authors describe the on-chip demodulation and the different detector read-out modes which are implemented for the ZIMPOL polarimeter, and test results are presented which allow an evaluation of the performance of the CCD detectors.
Journal ArticleDOI
Dynamical masses of M-dwarf binaries in young moving groups: I. The case of TWA 22 and GJ 2060
L. Rodet,Mickael Bonnefoy,Stephen Durkan,Stephen Durkan,H. Beust,Anne-Marie Lagrange,Joshua E. Schlieder,Joshua E. Schlieder,Markus Janson,A. Grandjean,Gael Chauvin,Gael Chauvin,Sergio Messina,Anne-Lise Maire,Wolfgang Brandner,Julien Girard,Julien Girard,P. Delorme,Beth Biller,C. Bergfors,C. Bergfors,Sylvestre Lacour,Markus Feldt,Thomas Henning,A. Boccaletti,J.-B. Le Bouquin,Jean-Philippe Berger,Jean-Louis Monin,Stéphane Udry,S. Peretti,Damien Ségransan,F. Allard,Derek Homeier,Arthur Vigan,Maud Langlois,Janis Hagelberg,François Ménard,A. Bazzon,J.-L. Beuzit,A. Delboulbé,Silvano Desidera,Raffaele Gratton,J. Lannier,Roxanne Ligi,D. Maurel,Dino Mesa,Michael Meyer,A. Pavlov,Joany Andreina Manjarres Ramos,R. Rigal,Ronald Roelfsema,Graeme Salter,Matthias Samland,T. Schmidt,Eric Stadler,L. Weber +55 more
TL;DR: Teff et al. as discussed by the authors used a Markov chain Monte-Carlo (MCMC) module to estimate posteriors on the orbital parameters and dynamical masses of GJ 2060 AB and TWA 22 AB from the astrometry and RVs.
Proceedings ArticleDOI
System study of EPICS: the exoplanets imager for the E-ELT
Christophe Vérinaud,Markus Kasper,Jean-Luc Beuzit,Raffaele Gratton,Dino Mesa,Emmanuel Aller-Carpentier,Enrico Fedrigo,Lyu Abe,Pierre Baudoz,Anthony Boccaletti,Mariangela Bonavita,Kjetil Dohlen,Norbert Hubin,Florian Kerber,Visa Korkiakoski,J. Antichi,Patrice Martinez,Patrick Rabou,Ronald Roelfsema,Hans Martin Schmid,Niranjan Thatte,G. Salter,Matthias Tecza,Lars Venema,H. Hanenburg,Rieks Jager,Natalia Yaitskova,Olivier Preis,Mélanie Orecchia,Eric Stadler +29 more
TL;DR: In this article, the authors designed a common path and diffraction suppression system for the EELT in order to maximize the efficiency of quasi-static speckles rejection by calibration and post-processing using the spectral and polarization dependency of light waves.