Vincent Minier | CEA - Academia.edu (original) (raw)

Papers by Vincent Minier

The data were observed over ~10 weeks during an intermittent observing period that spanned from 2... more The data were observed over ~10 weeks during an intermittent observing period that spanned from 2004 July to 2004 October. (3 data files).

New Astronomy Reviews, 1999

Toute la vie d'une etoile est determinee par sa masse. C'est pourquoi les astrophysiciens... more Toute la vie d'une etoile est determinee par sa masse. C'est pourquoi les astrophysiciens s'interessent maintenant aux moments de la naissance des astres, recherchant ce qui definit leur masse. De nouveaux instruments d'observation, comme le telescope spatial Herschel, vont participer a cette etude demographique.

Astronomy & Astrophysics, 2012

We report on recent multi-scale observational stud-ies of the earliest stages of high mass (>8... more We report on recent multi-scale observational stud-ies of the earliest stages of high mass (>8 M) star formation using methanol MASERs as astronomical probes. Methanol masers can provide unique informa-tion about densely populated, embedded protoclusters in which precursors of O and B stars form. Tracers of high mass star-forming complexes in the Galactic plane: The brightest methanol masers are detected in radio frequencies at 6.7 and 12.2 GHz and are not affected by extinction in high mass star-forming regions. They were originally detected in the environment of very active star-forming complexes of HII regions a decade ago [1]. Since their discovery, more than 500 methanol maser sites have been located in the Galactic plane through searches toward IRAS colour selected sources [2], OH and H 2 O masers [3] as well as through unbiased full-sampling surveys [4,5]. Interestingly, 6.7-GHz methanol masers have not been detected toward low mass star-forming regions despite very sensit...

Inventing a Space Mission, 2017

The implementation of Herschel as one of the most powerful space telescopes ever built was possib... more The implementation of Herschel as one of the most powerful space telescopes ever built was possible thanks to key inventions and innovations. They result from a long-term process, leading to the required scientific performances and an efficient mission management. The innovation process started during the design of the mission and finished with the final breath of the cryostat. This chapter examines the concept of innovation and apply it to the system design process and management that shaped the success of the Herschel mission.

Peter Barnes (U Sydney), Kate Brooks (ATNF), Michael Burton (UNSW), Maria Cunningham (UNSW), John... more Peter Barnes (U Sydney), Kate Brooks (ATNF), Michael Burton (UNSW), Maria Cunningham (UNSW), John Dickey (U Tasmania), Phil Edwards (ISAS), Ron Ekers (ATNF), Yasuo Fukui (U Nagoya), Annie Hughes (Swinburne U), Ilana Klamer (U Sydney / ATNF), Vincent Minier (CEA Saclay), Erik Mueller (ATNF), Juergen Ott (ATNF), Bob Sault (ATNF), Mark Thompson (U Hertfordshire), Andrew Walsh (UNSW), Tony Wong (UNSW / ATNF).

Here we describe the various elements of the Herschel cryogenic concept and its evolution since t... more Here we describe the various elements of the Herschel cryogenic concept and its evolution since the first proposal submitted to ESA in 1982, following developments from previous cryogenic missions, and continuous adaptation to the evolving needs of the focal plane instruments, ending in a substantially different concept. A temperature below 2 K was necessary for the Herschel instruments to achieve the required sensitivity. Herschel therefore carried a liquid He cryostat of 2300 l capacity, with the liquid in the superfluid phase at a temperature of 1.6 K. This temperature was optimum for the photoconductive detectors of the PACS spectrometer and for the SIS mixers of the heterodyne HIFI instrument. The detectors of the PACS camera and of the SPIRE camera and spectrometer were bolometers, which required an even lower operating temperature. To achieve this, PACS and SPIRE had their own 3He sorption coolers to reach a temperature of 0.3 K. The telescope was launched warm and, once in o...

This chapter outlines the diagnostic importance of the far-infrared and submillimetre spectral ra... more This chapter outlines the diagnostic importance of the far-infrared and submillimetre spectral range and presents the evolution of the mission’s science objectives from the time of its original conception and goes on to describe the results and scientific achievements of Herschel. It shows how the opening of a spectral window, previously poorly studied, has changed our view of the most important components of our Universe, from galaxies and stars and the processes of their formation to planetary systems and the ‘water trail ’. The last section is a bibliometric analysis of the scientific return of Herschel and how it has interconnected the scientific community, illustrated by a new and original co-citation mapping. The quantity and quality of the data coming from Herschel during its almost 4-year observing lifetime will remain unique for a long time, casting new light on astronomical phenomena and processes never seen before.

Symposium - International Astronomical Union, 2004

The newly upgraded Australia Telescope Compact Array (ATCA) at millimetre wavelengths is the firs... more The newly upgraded Australia Telescope Compact Array (ATCA) at millimetre wavelengths is the first millimetre interferometer to be built in the Southern Hemisphere. The full array will be operational in 2004-2005 and will provide arcsec angular resolution at 3 mm and 12 mm. This will be a unique instrument to study at high angular resolution the interstellar chemistry and more generally the star formation process, especially in the bulk of the galactic plane and in the Magellanic Clouds. The upgraded ATCA will also be an excellent tool to detect dust emission from nearby protoplanetary disks. In this paper I will present the first results from the upgraded ATCA at 3 mm and 12 mm. The result review will cover the topics of massive star formation and hot molecular cores dust emission from star-forming regions and detection of protoplanetary disks.

Experimental Astronomy, 2018

Encyclopedia of Astrobiology, 2015

EAS Publications Series, 2009

SPIE Proceedings, 2014

ABSTRACT We illustrate the status of the international infra-red telescope IRAIT-ITM, a project d... more ABSTRACT We illustrate the status of the international infra-red telescope IRAIT-ITM, a project developed thanks to an Italian- Spanish-French collaboration and now sited at the Dome C Antarctic base. The telescope and its subsystems were installed at DomeC by a team of Italian and French scientists. The 80 cm telescope is placed on a small snow hill next to a laboratory of astronomy. The operations started in January 2013, with the Nasmyth focal planes equipped with the midinfrared camera AMICA for 1.25 to 25 μm and the sub-millimetre camera CAMISTIC for observation of the sky noise at 200 and 350 μm using a bolometer camera. During 2013 the two winter-overs worked mainly on technological duties, learning how to operate the telescope, while temperatures decreased down to -80°C. The cryogenic systems could be operated respectively at 0.25K and 4K at all times, with satisfactory use of the heat from the compressors of the cryocoolers to the warm-up the laboratory through a closed loop glycol system. The lack of tests and reliability in extreme conditions of some components and difficult access to maintenance hampered regular observations below -50°C. Using the lessons of this first winter, the summer team improves the robustness of the failing systems and ease the access to maintenance. The winter 2014 is the first one with programmed observations. Because of power restrictions, the two instruments are used each one at a time by periods of 2 weeks. The Camistic camera continues to observe the stability of the sky at a fixed altitude in chopping mode and performs skydips. The TCS is being upgraded in order to prepare the next summer season with extensive observations of the sun with Camistic.