Scientific Commons: Pierre Magain

New Insights into the Quasar Type1/Type2 Dichotomy from Correlations between Quasar Host Orientation and Polarization (2009)

Borguet, Benoît, Hutsemekers, Damien, Letawe, Géraldine, Letawe, Yannick, Magain, Pierre

Astronomical Polarimetry 2008: Science from Small to Large Telescopes

Near-intrared observations of the HE 0450-2958 system: discovery of a second active galactic nucleus? (2009)

Letawe, Géraldine, Magain, Pierre, Chantry, Virginie, Letawe, Yannick

The quasi-stellar object (QSO) HE 0450−2958 was brought to the front scene by the non-detection of its host galaxy and strong upper limits on the latter's luminosity. The QSO is also a powerful...

Transiting exoplanets from the CoRoT space mission. V. CoRoT-Exo-4b: stellar and planetary parameters (2008)

Moutou, C, Bruntt, H, Guillot, T, Shporer, A, Guenther, E, Aigrain, S, ...

Aims. The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system...

Transiting exoplanets from the CoRoT space mission. IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit (2008)

Aigrain, S, Collier Cameron, A, Ollivier, M, Pont, F, Jorda, L, Almenara, J M, ...

CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets...

Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star (2008)

Alonso, R, Auvergne, M, Baglin, A, Ollivier, M, Moutou, C, Rouan, D, ...

Context: The CoRoT mission, a pioneer in exoplanet searches from space, has completed its first 150 days of continuous observations of ~12 000 stars in the galactic plane. An analysis of the raw data...

Evidence of a type 1/type 2 dichotomy in the correlation between quasar optical polarization and host-galaxy/extended emission position angles (2008)

Borguet, Benoît, Hutsemekers, Damien, Letawe, Géraldine, Letawe, Yannick, Magain, Pierre

Aims.For Seyfert galaxies, the AGN unification model provides a simple and well-established explanation of the type 1/type 2 dichotomy through orientation-based effects. The generalization of this...

Quasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy (2008)

Borguet, Benoît, Hutsemekers, Damien, Letawe, Géraldine, Letawe, Yannick, Magain, Pierre

The Nuclear Region, Host Galaxy and Environment of Active Galaxies

Slit and integral-field optical spectroscopy of the enigmatic quasar HE 0450-2958 (2008)

Letawe, Géraldine, Magain, Pierre, Courbin, Frederic

On-axis spectroscopy of the host galaxies of 20 optically luminous quasars at z similar to 0.3 (2007)

Letawe, Géraldine, Magain, Pierre, Courbin, F, Jablonka, P, Jahnke, K, Meylan, G, ...

We present the analysis of a sample of 20 bright low-redshift quasars (M-B < -23 and z < 0.35) observed spectroscopically with the Very Large Telescope (VLT). The Focal Reducer/low dispersion...

Deconvolution of HST images of the Cloverleaf gravitational lens - Detection of the lensing galaxy and a partial Einstein ring (2007)

Chantry, Virginie, Magain, Pierre

Archival HST/NICMOS-2 images of the Cloverleaf gravitational lens ( H1413+ 117), a quadruply-imaged quasar, were analysed with a new method derived from the MCS deconvolution algorithm (Magain et al....

Deconvolution of HST images of the Cloverleaf gravitational lens : detection of the lensing galaxy and a partial Einstein ring (2006)

Chantry, Virginie, Magain, Pierre

Archival HST/NICMOS-2 images of the Cloverleaf gravitational lens (H1413+117), a quadruply imaged quasar, have been analysed with a new method derived from the MCS deconvolution algorithm (Magain et...

High accuracy transit photometry of the planet OGLE-TR-113b with a new deconvolution-based method (2006)

Gillon, Michaël, Pont, F, Moutou, C, Bouchy, F, Courbin, F, Sohy, Sandrine, ...

A high accuracy photometry algorithm is needed to take full advantage of the potential of the transit method for the characterization of exoplanets, especially in deep crowded fields. It has to...

High precision determination of the atmospheric parameters and abundances of the COROT main targets (2006)

Gillon, Michaël, Magain, Pierre

Context: .One of the main goals of the COROT mission is to get precise photometric observations of selected bright stars in order to allow the modelling of their interior through asteroseismology....

The host galaxies of the brightest quasars: Gas-rich galaxies, mergers, and young stars (2006)

Courbin, Frédéric, Letawe, Géraldine, Meylan, Georges, Magain, Pierre, Jablonka, Pascale, Jahnke, Knud, ...

On the potential of extrasolar planet transit surveys (2005)

Gillon, Michaël, Courbin, F, Magain, Pierre, Borguet, Benoît

We analyse the respective benefits and drawbacks of ground-based and space-based transit surveys for extrasolar planets. Based on simple but realistic assumptions about the fraction of lower main...

Photometric monitoring of the doubly imaged quasar UM 673: possible evidence for chromatic microlensing (2005)

Nakos, Th, Courbin, F, Poels, Joël, Libbrecht, C, Magain, Pierre, Surdej, Jean, ...

We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the Gunn...

Discovery of a bright quasar without a massive host galaxy (2005)

Magain, Pierre, Letawe, Geraldine, Courbin, Frederic, Jablonka, Pascale, Jahnke, Knud, Wisotzki, Lutz, ...

Quasars are thought to be powered by the infall of matter onto a supermassive black hole at the centre of massive galaxies. As the optical luminosity of quasars exceeds that of their host galaxy,...

Chemical abundances in 43 metal-poor stars (2005)

Jonsell, Karin, Edvardsson, Bengt, Gustafsson, Bengt, Magain, Pierre, Nissen, Poul Erik, Asplund, Martin

We have derived abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Fe, Ni and Ba for 43 metal-poor field stars in the solar neighbourhood with iron abundances [Fe/H] ranging from -0.4 to -3.0. Total...

The Influence of Blends on the Potential of Extrasolar Planets Transit Surveys (2005)

Gillon, Michaël, Magain, Pierre, Guillot, T, Fressin, F

Due to their low geometric probability, planetary transits are rare, and photometric surveys searching for such events have to observe many stars at once and, thus, deal with rather crowded fields....

Abundance analysis of targets for the COROT/MONS asteroseismology missions. II. Abundance analysis of the COROT main targets (2004)

Bruntt, H, Bikmaev, I F, Catala, C, Solano, E, Gillon, Michaël, Magain, Pierre, ...

One of the goals of the ground-based support program for the COROT and MONS/RÖMER satellite missions is to characterize suitable target stars for the part of the missions dedicated to...

Deep Imaging of AXJ2019+112: The Luminosity of a ``Dark Cluster'' (1998)

Benitez, Narciso, Broadhurst, Tom, Rosati, Piero, Courbin, Fred, Squires, Gordon, Lidman, Chris, ...

We detect a distant cluster of galaxies centered on the QSO lens and luminous X-ray source AXJ2019+112, a.k.a. ``The Dark Cluster'' (Hattori et al 1997). Using deep V,I Keck images and wide-field K_s...

ESO & NOT photometric monitoring of the Cloverleaf quasar (1997)

Ostensen, R, Remy, M, Lindblad, P O, Refsdal, S, Stabell, R, Surdej, Jean, ...

The Cloverleaf quasar, H1413+117, has been photometrically monitored at ESO (La Silla, Chile) and with the NOT (La Palma, Spain) during the period 1987--1994. All good quality CCD frames have been...

The LMC transition star R 84 and the core of the LH 39 OB association. (1997)

Heydari-Malayeri, M, Courbin, F, Rauw, Grégor, Esslinger, O, Magain, Pierre

On the basis of sub-arcsecond imaging obtained at the ESO NTT with SUSI and the ESO ADONIS adaptive optics system at the 3.6m telescope, we resolve and study the core components of the LMC OB...

WR22: the most massive Wolf-Rayet star ever weighed. (1996)

Rauw, Grégor, Vreux, J-M, Gosset, Eric, Hutsemekers, Damien, Magain, Pierre, Rochowicz, K

The results of an extensive spectroscopic campaign on the eclipsing binary WR22 are presented. A new radial velocity curve is deduced for the WN7 component, allowing us to improve the parameters of...

WR22 as a core hydrogen-burning Wolf-Rayet star (1995)

Rauw, Grégor, Vreux, Jean-Marie, Gosset, Eric, Hutsemekers, Damien, Magain, Pierre

The analysis of an extensive sample of high resolution spectra of the Wolf-Rayet binary WR22 recently allowed us to determine a minimum mass of 72 M_solar for the WN7 star. With such a high mass,...

A seven year campaign on WR 22 (1995)

Rauw, Grégor, Vreux, J-M, Gosset, Eric, Hutsemekers, Damien, Magain, Pierre, Manfroid, Jean, ...

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A seven year campaign on WR 22 (1995)

Rauw, Grégor, Vreux, J-M, Gosset, Eric, Hutsemekers, Damien, Magain, Pierre, Manfroid, Jean, ...

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Gravitational lensing statistics based on a large sample of highly luminous quasars (1993)

Surdej, Jean, Claeskens, J F, Crampton, D, Filippenko, A V, Hutsemekers, Damien, Magain, Pierre, ...

Results on gravitational lensing statistics applied to a sample of 469 highly luminous quasars are reported. The objects were directly imaged, either from the ground under optimal seeing conditions,...

Erratum - Q:1208+1011 - the Most Distant Multiply Imaged Quasar or a Binary (1993)

Magain, Pierre, Surdej, Jean, Vanderriest, C, Pirenne, B, Hutsemekers, Damien

In the title of this Letter, the word "multiply" was accidentally omitted. The correct title is shown above.

Two new very close pairs of quasars with discordant redshifts and a gravitational lens candidate. (1993)

Surdej, Jean, Remy, M, Smette, A, Claeskens, J-F, Magain, Pierre, Refsdal, S, ...

Gravitational Lenses in the Universe

Two new very close pairs of quasars with discordant redshifts and a gravitational lens candidate (1993)

Surdej, Jean, Remy, M, Smette, A, Magain, Pierre, Refsdal, S, ...