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Featured researches published by Y. André.


Proceedings of SPIE | 2014

PILOT: a balloon-borne experiment to measure the polarized FIR emission of dust grains in the interstellar medium

R. Misawa; J.-P. Bernard; Peter A. R. Ade; Y. André; P. de Bernardis; M. Bouzit; M. Charra; B. Crane; Jean-Pierre Dubois; C. Engel; Matthew Joseph Griffin; Peter Charles Hargrave; B. Leriche; Y. Longval; S. Maes; C. Marty; W. Marty; S. Masi; B. Mot; J. Narbonne; F. Pajot; Giampaolo Pisano; N. Ponthieu; I. Ristorcelli; L. Rodriguez; G. Roudil; M. Salatino; G. Savini; Carole Tucker

Future cosmology space missions will concentrate on measuring the polarization of the Cosmic Microwave Back- ground, which potentially carries invaluable information about the earliest phases of the evolution of our universe. Such ambitious projects will ultimately be limited by the sensitivity of the instrument and by the accuracy at which polarized foreground emission from our own Galaxy can be subtracted out. We present the PILOT balloon project which will aim at characterizing one of these foreground sources, the polarization of the dust continuum emission in the diffuse interstellar medium. The PILOT experiment will also constitute a test-bed for using multiplexed bolometer arrays for polarization measurements. We present the results of ground tests obtained just before the first flight of the instrument.


International Conference on Space Optics — ICSO 2014 | 2017

PILOT: optical performance and end-to-end characterisation

Y. Longval; Peter A. R. Ade; Y. André; F. Bousquet; V. Buttice; M. Charra; Jean-Pierre Dubois; C. Engel; Matthew Joseph Griffin; Peter Charles Hargrave; S. Maestre; W. Marty; S. Masi; B. Mot; Giampaolo Pisano; I. Ristorcelli; L. Rodriguez; G. Roudil; O. Simonella; M. Salatino; G. Savini; C. Tucker; J.-P. Bernard; R. Misawa; P. deBernardis; M. Bouzit; B. Crane; B. Leriche; C. Marty; J. Narbonne

PILOT (Polarized Instrument for the Long-wavelength Observations of the Tenuous ISM), is a balloon-borne astronomy experiment dedicated to study the polarization of dust emission from the diffuse ISM in our Galaxy [1]. The observations of PILOT have two major scientific objectives. Firstly, they will allow us to constrain the large-scale geometry of the magnetic field in our Galaxy and to study in details the alignment properties of dust grains with respect to the magnetic field. In this domain, the measurements of PILOT will complement those of the Planck satellite at longer wavelengths. In particular, they will bring information at a better angular resolution, which is critical in crowded regions such as the Galactic plane. They will allow us to better understand how the magnetic field is shaping the ISM material on large scale in molecular clouds, and the role it plays in the gravitational collapse leading to star formation. Secondly, the PILOT observations will allow us to measure for the first time the polarized dust emission towards the most diffuse regions of the sky, where the measurements are the most easily interpreted in terms of the physics of dust. In this particular domain, PILOT will play a role for future CMB missions similar to that played by the Archeops experiment for Planck. The results of PILOT will allow us to gain knowledge about the magnetic properties of dust grains and about the structure of the magnetic field in the diffuse ISM that is necessary to a precise foreground subtraction in future polarized CMB measurements. The PILOT measurements, combined with those of Planck at longer wavelengths, will therefore allow us to further constrain the dust models. The outcome of such studies will likely impact the instrumental and technical choices for the future space missions dedicated to CMB polarization. The PILOT instrument will allow observations in two photometric channels at wavelengths 240 μm and 550 μm, with an angular resolution of a few arcminutes. We will make use of large format bolometer arrays, developed for the PACS instrument on board the Herschel satellite. With 1024 detectors per photometric channel and photometric band optimized for the measurement of dust emission, PILOT is likely to become the most sensitive experiment for this type of measurements. The PILOT experiment will take advantage of the large gain in sensitivity allowed by the use of large format, filled bolometer arrays at frequencies more favorable to the detection of dust emission. This paper presents the optical design, optical characterization and its performance. We begin with a presentation of the instrument and the optical system and then we summarise the main optical tests performed. In section III, we present preliminary end-to-end test results.


International Conference on Space Optics 2016 | 2017

Pilot optical alignment

B. Mot; Y. Longval; J. Aumont; N. Bray; Olivier Boulade; M. Bouzit; V. Buttice; A. Caillat; M. Charra; M. Chaigneau; C. Coudournac; J.-P. Crussaire; F. Douchin; Peter Charles Hargrave; A. Hughes; Y. Lepennec; S. Maestre; B. Maffei; J. Martignac; W. Marty; R. Misawa; L. Montier; F. Pajot; G. Parot; Giampaolo Pisano; N. Ponthieu; I. Ristorcelli; M. Salatino; M. Saccoccio; P. Tapie

PILOT (Polarized Instrument for Long wavelength Observations of the Tenuous interstellar medium) is a balloonborne astronomy experiment designed to study the polarization of dust emission in the diffuse interstellar medium in our Galaxy. The PILOT instrument allows observations at wavelengths 240 μm (1.2THz) with an angular resolution about two arc-minutes. The observations performed during the first flight in September 2015 at Timmins, Ontario Canada, have demonstrated the optical performances of the instrument.


Proceedings of SPIE | 2016

Inflight performance of the PILOT balloon-borne experiment

J.-Ph. Bernard; Peter A. R. Ade; Y. André; J. Aumont; L. Bautista; N. Bray; P. de Bernardis; O. Boulade; F. Bousquet; M. Bouzit; V. Buttice; A. Caillat; M. Charra; M. Chaigneau; B. Crane; J.-P. Crussaire; F. Douchin; E. Doumayrou; Jean-Pierre Dubois; C. Engel; P. Etcheto; P. Gélot; Matthew Joseph Griffin; G. Foenard; S. Grabarnik; Peter Charles Hargrave; A. Hughes; R. J. Laureijs; Y. Lepennec; B. Leriche

PILOT is a stratospheric experiment designed to measure the polarization of dust FIR emission, towards the diffuse interstellar medium. The first PILOT flight was carried out from Timmins in Ontario-Canada on September 20th 2015. The flight has been part of a launch campaign operated by the CNES, which has allowed to launch 4 experiments, including PILOT. The purpose of this paper is to describe the performance of the instrument in flight and to perform a first comparison with those achieved during ground tests. The analysis of the flight data is on-going, in particular the identification of instrumental systematic effects, the minimization of their impact and the quantification of their remaining effect on the polarization data. At the end of this paper, we shortly illustrate the quality of the scientific observations obtained during this first flight, at the current stage of systematic effect removal.


Proceedings of SPIE | 2016

PILOT optical alignment

Y. Longval; B. Mot; Peter A. R. Ade; Y. André; J. Aumont; L. Baustista; J.-Ph. Bernard; N. Bray; P. de Bernardis; O. Boulade; F. Bousquet; M. Bouzit; V. Buttice; A. Caillat; M. Charra; M. Chaigneau; B. Crane; J.-P. Crussaire; F. Douchin; E. Doumayrou; Jean-Pierre Dubois; C. Engel; P. Etcheto; P. Gélot; Matthew Joseph Griffin; G. Foenard; S. Grabarnik; Peter Charles Hargrave; A. Hughes; R. J. Laureijs

PILOT is a balloon-borne astronomy experiment designed to study the polarization of dust emission in the diffuse interstellar medium in our Galaxy at wavelengths 240 μm with an angular resolution about two arcminutes. Pilot optics is composed an off-axis Gregorian type telescope and a refractive re-imager system. All optical elements, except the primary mirror, are in a cryostat cooled to 3K. We combined the optical, 3D dimensional measurement methods and thermo-elastic modeling to perform the optical alignment. The talk describes the system analysis, the alignment procedure, and finally the performances obtained during the first flight in September 2015.


arXiv: Instrumentation and Methods for Astrophysics | 2018

PILOT balloon-borne experiment in-flight performance

G. Foenard; A. Mangilli; J. Aumont; A. Hughes; B. Mot; J.-P. Bernard; A. Lacourt; I. Ristorcelli; Y. Longval; Peter A. R. Ade; Y. André; L. Bautista; P. deBernardis; O. Boulade; F. Bousqet; M. Bouzit; V. Buttice; M. Charra; B. Crane; E. Doumayrou; Jean-Pierre Dubois; C. Engel; Matthew Joseph Griffin; S. Grabarnik; Peter Charles Hargrave; R. J. Laureijs; B. Leriche; S. Maestre; B. Maffei; C. Marty


Experimental Astronomy | 2017

The optical performance of the PILOT instrument from ground end-to-end tests

R. Misawa; J.-P. Bernard; Y. Longval; I. Ristorcelli; Peter A. R. Ade; D. Alina; Y. André; J. Aumont; L. Bautista; P. de Bernardis; O. Boulade; F. Bousqet; M. Bouzit; V. Buttice; A. Caillat; M. Chaigneau; M. Charra; B. Crane; F. Douchin; E. Doumayrou; J. P. Dubois; C. Engel; Matthew Joseph Griffin; G. Foenard; S. Grabarnik; Peter Charles Hargrave; A. Hughes; R. J. Laureijs; B. Leriche; S. Maestre


Ceas Space Journal | 2017

The PILOT optical alignment for its first flight

B. Mot; Y. Longval; J.-Ph. Bernard; Peter A. R. Ade; Y. André; J. Aumont; L. Bautista; N. Bray; P. deBernardis; O. Boulade; F. Bousquet; M. Bouzit; V. Buttice; A. Caillat; M. Chaigneau; C. Coudournac; B. Crane; F. Douchin; E. Doumayrou; J.-P. Dubois; C. Engel; P. Etcheto; P. Gélot; Matthew Joseph Griffin; G. Foenard; S. Grabarnik; Peter Charles Hargrave; A. Hughes; R. J. Laureijs; Y. Lepennec


Archive | 2015

PILOT end-to-end calibration results

R. Misawa; J.-P. Bernard; Peter A. R. Ade; Y. André; P. deBernardis; L. Bautista; Olivier Boulade; E. Bousquet; M. Bouzit; N. Bray; C. Brysbaert; V. Buttice; A. Caillat; M. Chaigneau; M. Charra; B. Crane; F. Douchin; E. Doumayrou; Jean-Pierre Dubois; C. Engel; P. Etcheto; J. Evrard; P. Gélot; A. Gomes; S. Grabarnik; Matthew John Griffin; Peter Charles Hargrave; A. Jonathan; R. J. Laureijs; A. Laurens


Archive | 2010

PILOT: measuring the FIR astrophysical dust emission

Jean-Phillipe Bernard; Peter A. R. Ade; Y. André; P. deBernardis; Olivier Boulade; M. Bouzit; N. Brais; A. Caillat; T. Camus; R. Daddato; Jean-Pierre Dubois; F. Douchin; E. Doumayrou; C. Engel; J. Evrard; A. Gomes; Peter Charles Hargrave; R. J. Laureijs; Y. Lepennec; B. Leriche; Y. Longval; S. Maestre; J. Martingnac; C. Marty; W. Marty; S. Masi; F. Mirc; J. Narbonne; G. Otrio; F. Pajot

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F. Douchin

Centre National D'Etudes Spatiales

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Jean-Pierre Dubois

Centre national de la recherche scientifique

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B. Crane

University of Paris-Sud

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C. Engel

Paul Sabatier University

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V. Buttice

Université Paris-Saclay

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S. Grabarnik

European Space Research and Technology Centre

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A. Caillat

Aix-Marseille University

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