Applications to faint X-ray spectra in the (2009)
Kaspar Arzner, Manuel Güdel, Kevin Briggs, Ra Telleschi, Manfred Schmidt, Marc Audard, ...
(DOI: will be inserted by hand later) Unbinned maximum-likelihood estimators for low-count data
Dust amorphization in protoplanetary disks (2009)
Glauser, Adrian M., Guedel, Manuel, Watson, Dan M., Henning, Thomas, Schegerer, Alexander A., Wolf, Sebastian, ...
High-energy irradiation of the circumstellar material might impact the structure and the composition of a protoplanetary disk and hence the process of planet formation. In this paper, we present a...
Terebey, Susan, Fich, Michel, Noriega-Crespo, Alberto, Padgett, Deborah L., Fukagawa, Misato, Audard, Marc, ...
We investigate the environment of the very low luminosity object L1521F-IRS using data from the Taurus Spitzer Legacy Survey. The MIPS 160 μm image shows both extended emission from the Taurus cloud...
Structure and Evolution of Pre-Main Sequence Stars (2009)
Schulz, Norbert S., Allen, Glenn, Bautz, Mark W., Canizares, Claude C., Davis, John, Dewey, Dan, ...
Low-mass pre-main sequence (PMS) stars are strong and variable X-ray emitters, as has been well established by EINSTEIN and ROSAT observatories. It was originally believed that this emission was of...
Terebey, Susan, Fich, Michel, Noriega-Crespo, Alberto, Padgett, Deborah L., Fukagawa, Misato, Audard, Marc, ...
We investigate the environment of the very low-luminosity object L1521F IRS using data from the Taurus Spitzer Legacy Survey. The MIPS 160 micron image shows both extended emission from the Taurus...
Astronomy Astrophysics manuscript no. prox2 June 21, 2003 (2008)
Doi Will Be, Manuel Güdel, Marc Audard, Fabio Reale, Stephen L. Skinner, Jeffrey L. Linksy
We report results from a comprehensive study of the nearby M dwarf Proxima Centauri with the XMM-Newton satellite, using simultaneously its X-ray detectors and the Optical Monitor using its U band...
Million-degree plasma pervading the extended Orion Nebula (2008)
Güdel, Manuel, Briggs, Kevin R., Montmerle, Thierry, Audard, Marc, Rebull, Luisa, Skinner, Stephen L.
Most stars form as members of large associations within dense, very cold (10 to 100 kelvin) molecular clouds. The nearby giant molecular cloud in Orion hosts several thousand stars of ages less than...
Grosso, Nicolas, Audard, Marc, Bouvier, Jérôme, Briggs, Kevin, Güdel, Manuel
We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a...
X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud (2007)
Grosso, Nicolas, Briggs, Kevin, Güdel, Manuel, Guieu, Sylvain, Franciosini, Elena, Palla, Francesco, ...
AIMS. We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). METHODS. The XMM-Newton Extended Survey of the TMC (XEST) is a large program...
New Pre-Main Sequence Candidates in the Taurus-Auriga Star Forming Region (2007)
Scelsi, Luigi, Maggio, Antonio, Micela, Giuseppina, Pillitteri, Ignazio, Stelzer, Beate, Briggs, Kevin, ...
We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region. Candidate members have been selected among the...
X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud (2007)
Grosso, Nicolas, Briggs, Kevin, Güdel, Manuel, Guieu, Sylvain, Franciosini, Elena, Palla, Francesco, ...
AIMS. We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). METHODS. The XMM-Newton Extended Survey of the TMC (XEST) is a large program...
Grosso, Nicolas, Audard, Marc, Bouvier, Jérôme, Briggs, Kevin, Güdel, Manuel
We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a...
New Pre-Main Sequence Candidates in the Taurus-Auriga Star Forming Region (2007)
Scelsi, Luigi, Maggio, Antonio, Micela, Giuseppina, Pillitteri, Ignazio, Stelzer, Beate, Briggs, Kevin, ...
We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region. Candidate members have been selected among the...
High-resolution X-ray spectroscopy of T Tauri stars in the Taurus-Auriga complex (2007)
Ra Telleschi, Manuel Güdel, Kevin R. Briggs, Marc Audard, Luigi Scelsi
Context. Differences have been reported between the X-ray emission of accreting and non-accreting stars. Some observations have suggested that accretion shocks could be responsible for part of the...
Hard X-rays and Fluorescent Iron Emission from the Embedded Infrared Cluster in NGC 2071 (2006)
Skinner, Stephen L., Simmons, Audrey E., Audard, Marc, Guedel, Manuel
We present first results of XMM-Newton X-ray observations of the infrared cluster lying near the NGC 2071 reflection nebula in the Orion B region. This cluster is of interest because it is one of the...
The XMM-Newton Optical Monitor Survey of the Taurus Molecular Cloud (2006)
Audard, Marc, Briggs, Kevin, Grosso, Nicolas, Guedel, Manuel, Scelsi, Luigi, Bouvier, Jerome, ...
The Optical Monitor (OM) on-board XMM-Newton obtained optical/ultraviolet data for the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST), simultaneously with the X-ray detectors. With...
The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) (2006)
Güdel, Manuel, Briggs, Kevin, Arzner, Kaspar, Audard, Marc, Bouvier, Jérôme, Feigelson, Eric, ...
(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys the most populated ~5 square degrees of the Taurus star formation region, using the XMM-Newton X-ray...
Arzner, Kaspar, Güdel, Manuel, Briggs, Kevin, Telleschi, Alessandra, Schmidt, Manfred, Audard, Marc, ...
Traditional binned statistics such as $\chi^2$ suffer from information loss and arbitrariness of the binning procedure. We point out that the underlying statistical quantity (the log likelihood $L$)...
Grosso, Nicolas, Audard, Marc, Bouvier, Jérôme, Briggs, Kevin, Güdel, Manuel
We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a...
Grosso, Nicolas, Audard, Marc, Bouvier, Jérôme, Briggs, Kevin, Güdel, Manuel
We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a...
Grosso, Nicolas, Audard, Marc, Bouvier, Jérôme, Briggs, Kevin R., Güdel, Manuel, ...
We aim to characterize the U-band variability of young brown dwarfs in the Taurus Molecular Cloud and discuss its origin. We used the XMM-Newton Extended Survey of the Taurus Molecular Cloud, where a...
X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud (2006)
Grosso, Nicolas, Briggs, Kevin, Güdel, Manuel, Guieu, Sylvain, Franciosini, Elena, Palla, Francesco, ...
AIMS. We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). METHODS. The XMM-Newton Extended Survey of the TMC (XEST) is a large program...
X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud (2006)
Grosso, Nicolas, Briggs, Kevin, Güdel, Manuel, Guieu, Sylvain, Franciosini, Elena, Palla, Francesco, ...
AIMS. We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). METHODS. The XMM-Newton Extended Survey of the TMC (XEST) is a large program...
The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) (2006)
Güdel, Manuel, Briggs, Kevin, Arzner, Kaspar, Audard, Marc, Bouvier, Jérôme, Feigelson, Eric, ...
(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys the most populated ~5 square degrees of the Taurus star formation region, using the XMM-Newton X-ray...
New Pre-Main Sequence Candidates in the Taurus-Auriga Star Forming Region (2006)
Scelsi, Luigi, Maggio, Antonio, Micela, Giuseppina, Pillitteri, Ignazio, Stelzer, Beate, Briggs, Kevin, ...
We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region. Candidate members have been selected among the...
New Pre-Main Sequence Candidates in the Taurus-Auriga Star Forming Region (2006)
Scelsi, Luigi, Maggio, Antonio, Micela, Giuseppina, Pillitteri, Ignazio, Stelzer, Beate, Briggs, Kevin, ...
We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region. Candidate members have been selected among the...
The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) (2006)
Güdel, Manuel, Briggs, Kevin, Arzner, Kaspar, Audard, Marc, Bouvier, Jérôme, Feigelson, Eric, ...
(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys the most populated ~5 square degrees of the Taurus star formation region, using the XMM-Newton X-ray...
NLTE Model Atmosphere Analysis of the LMC Supersoft X-ray Source CAL 83 (2004)
Lanz, Thierry, Telis, Gisela A., Audard, Marc, Paerels, Frits, Rasmussen, Andrew P., Hubeny, Ivan
We present a non-LTE model atmosphere analysis of Chandra HRC-S/LETG and XMM-Newton RGS spectroscopy of the prototypical supersoft source CAL 83 in the Large Magellanic Cloud. Taken with a 16-month...
Observations of magnetically active stars with Chandra and XMM-Newton have deepened our knowledge of the physics of the atmospheres in late-type stars. In this review paper, I discuss two topics that...
A Multiwavelength Study of RZ Cassiopeiae: The XMM-Newton/VLA Campaign (2004)
Audard, Marc, Donisan, Julius R., Guedel, Manuel
XMM-Newton and the VLA simultaneously observed the eclipsing Algol-type binary RZ Cassiopeiae in August 2003. The secondary eclipse (K3 IV companion behind the A3 V primary) was placed at the center...
Audard, Marc, Skinner, Stephen L., Smith, Kester W., Guedel, Manuel, Pallavicini, Roberto
Weak-lined T Tauri stars (WTTS) represent the important stage of stellar evolution between the accretion phase and the zero-age main sequence. At this stage, the star decouples from its accretion...
Some Like it Hot: The X-Ray Emission of The Giant Star YY Mensae (2004)
Audard, Marc, Telleschi, Alessandra, Guedel, Manuel, Skinner, Stephen L., Pallavicini, Roberto, Mitra-Kraev, Urmila
(Abridged abstract) We present an analysis of the X-ray emission of the rapidly rotating giant star YY Mensae observed by Chandra HETGS and XMM-Newton. Although no obvious flare was detected, the...
Resolving X-ray sources from B-stars spectroscopically: The example of mu Lep (2004)
Behar, Ehud, Leutenegger, Maurice, Doron, Rami, Guedel, Manuel, Feldman, Uri, Audard, Marc, ...
We present high-resolution X-ray observations of the chemically peculiar late-type B-star: mu Lep. However, we find spectroscopic and astrometric evidence, which show that the X-rays are not traced...
Separating the X-Ray Emissions of UV Ceti A and B with Chandra (2003)
Audard, Marc, Guedel, Manuel, Skinner, Stephen L.
We present the first spatially separated X-ray observation of the active UV Ceti binary with \textit{Chandra}, providing important new information on the relative X-ray activity levels of its nearly...
Guedel, Manuel, Audard, Marc, Skinner, Stephen L., Horvath, Matthias I.
Using the XMM-Newton X-ray observatory to monitor the nearest star to the Sun, Proxima Centauri, we recorded the weakest X-ray flares on a magnetically active star ever observed. Correlated X-ray and...
Guedel, Manuel, Audard, Marc, Kashyap, Vinay L., Drake, Jeremy J., Guinan, Edward F.
(Abridged) We investigate the EUV and X-ray flare rate distribution in radiated energy of the late-type active star AD Leo using long EUVE and BeppoSAX observations. We compare the observed light...
Flare Heating in Stellar Coronae (2002)
Kashyap, Vinay, Drake, Jeremy, Guedel, Manuel, Audard, Marc
We investigate the contribution of very weak flares to the coronal luminosity of low-mass active stars. We analyze EUVE/DS events data from FK Aqr, V1054 Oph, and AD Leo and conclude that in all...
Elemental Abundances in Stellar Coronae with XMM-Newton (2002)
The XMM-Newton Reflection Grating Spectrometer Team has obtained observations ofa large number of coronal sources of various activity levels, ages, and spectraltypes. In particular, X-ray bright RS...
Thesis (doctoral)--Swiss Federal Institute of Technology Zurich, 2002.
High-resolution X-ray spectroscopy and imaging of supernova remnant N132D (2000)
Behar, Ehud, Rasmussen, Andrew P., Griffiths, R. Gareth, Dennerl, Konrad, Audard, Marc, Aschenbach, Bernd, ...
The observation of the supernova remnant N132D by the scientific instruments on board the XMM-Newton satellite is presented. The X-rays from N132D are dispersed into a detailed line-rich spectrum...
EUV Flare Activity in Late-Type Stars (2000)
Audard, Marc, Guedel, Manuel, Drake, Jeremy J., Kashyap, Vinay L.
\textit{Extreme Ultraviolet Explorer} Deep Survey observations of cool stars (spectral type F to M) have been used to investigate the distribution of coronal flare rates in energy and its relation to...