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25 results

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  • DIVISION G COMMISSION 21: GALACTIC AND EXTRAGALACTIC BACKGROUNDS RADIATION

  • Jayant Murthy, Adolf Witt, W. Jack Baggaley, Eli Dwek, Anny-Chantal Levasseur-Regourd, Ingrid Mann, Kalevi Mattila, Jun-ichi Watanabe
  • Journal: Proceedings of the International Astronomical Union / Volume 11 / Issue T29A / August 2015
  • Published online by Cambridge University Press: 13 April 2016, pp. 522-524
  • Print publication: August 2015
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  • Commission 21 was one of the oldest and smallest in the IAU yet one which underwent the most evolution since its inception. It began in 1955 as Light of the Night Sky (Lumière du Ciel Nocturne) under the Presidentship of Jean Dufay (University Observatory at Lyon). As the name suggested, in the years before space observations, its focus was on observations of atmospheric light which, at the time, was the domain of astronomers. Thus the early proceedings of the Commission were dominated by reports of the daytime and nighttime emission as observed from different locations and different conditions. Our knowledge of the Earth's atmosphere is still shaped by these early observations (Meier R.R., 1991, Space Sci. Rev. 58, 1). Members of Commission 21 were key to organizing interational collaborations to set up atmospheric stations at different latitudes, including in the Souther hemisphere and in ensuring a consistent calibration between the instruments. The Commission also bought in results from Soviet scientists in an era where communication was limited by both politics and language.

Polarimetry of Stars and Planetary Systems
  • Edited by Ludmilla Kolokolova, James Hough, Anny-Chantal Levasseur-Regourd
  • Published online: 05 May 2015
  • Print publication: 14 May 2015
  • Summarising the striking advances of the last two decades, this reliable introduction to modern astronomical polarimetry provides a comprehensive review of state-of-the-art techniques, models and research methods. Focusing on optical and near-infrared wavelengths, each detailed, up-to-date chapter addresses a different facet of recent innovations, including new instrumentation, techniques and theories; new methods based on laboratory studies, enabling the modelling of polarimetric characteristics for a wide variety of astronomical objects; emerging fields of polarimetric exploration, including proto-planetary and debris discs, icy satellites, transneptunian objects, exoplanets, and the search for extraterrestrial life; and unique results produced by space telescopes, and polarimeters aboard exploratory spacecraft. With contributions from an international team of accomplished researchers, this is an ideal resource for astronomers and researchers working in astrophysics, earth sciences, and remote sensing keen to learn more about this valuable diagnostic tool. The book is dedicated to the memory of renowned polarimetrist Tom Gehrels.

  • COMMISSION 51: BIOASTRONOMY

  • William Irvine, Pascale Ehrenfreund, Alan Boss, Cristiano Cosmovici, Sun Kwok, Anny-Chantal Levasseur-Regourd, David Morrison, Stephane Udry
  • Journal: Proceedings of the International Astronomical Union / Volume 6 / Issue T27B / December 2010
  • Published online by Cambridge University Press: 14 May 2010, pp. 180-181
  • Print publication: December 2010
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  • Commission 51 met on August 12, 2009. Outgoing President Alan Boss chaired the meeting, and there were several dozen members present, including incoming President William Irvine, incoming Vice President Pascale Ehrenfreund, and outgoing Past President Karen Meech. Commission 51 (C51) was re-authorized for a term of six more years at the 2006 Prague General Assembly of the IAU, and hence comes up for renewal at the 2012 IAU General Assembly in Beijing, China.

  • Recent polarimetric observations of comet 67 P/Churyumov-Gerasimenko

  • Anny-Chantal Levasseur-Regourd, Edith Hadamcik, Asoke K. Sen, Ranjan Gupta, Jeremie Lasue
  • Journal: Proceedings of the International Astronomical Union / Volume 5 / Issue S263 / August 2009
  • Published online by Cambridge University Press: 06 April 2010, pp. 259-262
  • Print publication: August 2009
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  • Remote observations of solar light scattered by dust in comet 67P/Churyumov-Gerasimenko coma are of major importance to assess the properties of the dust and thus to prepare the rendezvous of the Rosetta spacecraft with comet 67P/Churyumov-Gerasimenko. We present polarimetric data obtained from India in December 2008 and France in March 2009. Compared with previous observations of this comet and of other Jupiter family comets, they confirm that it is dust-poor, although it may exhibit outbursts leading to the ejection of dust particles from its subsurface, especially after its perihelion passage.

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