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See detailThe LEECH Exoplanet Imaging Survey: Characterization of the Coldest Directly Imaged Exoplanet, GJ 504 b, and Evidence for Superstellar Metallicity
Skemer, Andrew J.; Morley, Caroline V.; Zimmerman, Neil T. et al

in Astrophysical Journal (2016), 817

As gas giant planets and brown dwarfs radiate away the residual heat from their formation, they cool through a spectral type transition from L to T, which encompasses the dissipation of cloud opacity and ... [more ▼]

As gas giant planets and brown dwarfs radiate away the residual heat from their formation, they cool through a spectral type transition from L to T, which encompasses the dissipation of cloud opacity and the appearance of strong methane absorption. While there are hundreds of known T-type brown dwarfs, the first generation of directly imaged exoplanets were all L type. Recently, Kuzuhara et al. announced the discovery of GJ 504 b, the first T dwarf exoplanet. GJ 504 b provides a unique opportunity to study the atmosphere of a new type of exoplanet with a ˜500 K temperature that bridges the gap between the first directly imaged planets (˜1000 K) and our own solar system's Jupiter (˜130 K). We observed GJ 504 b in three narrow L-band filters (3.71, 3.88, and 4.00 μm), spanning the red end of the broad methane fundamental absorption feature (3.3 μm) as part of the LBTI Exozodi Exoplanet Common Hunt (LEECH) exoplanet imaging survey. By comparing our new photometry and literature photometry with a grid of custom model atmospheres, we were able to fit GJ 504 b's unusual spectral energy distribution for the first time. We find that GJ 504 b is well fit by models with the following parameters: T[SUB]eff[/SUB] = 544 ± 10 K, g < 600 m s[SUP]-2[/SUP], [M/H] = 0.60 ± 0.12, cloud opacity parameter of f[SUB]sed[/SUB] = 2-5, R = 0.96 ± 0.07 R[SUB]Jup[/SUB], and log(L) = -6.13 ± 0.03 L[SUB]⊙[/SUB], implying a hot start mass of 3-30 M[SUB]jup[/SUB] for a conservative age range of 0.1-6.5 Gyr. Of particular interest, our model fits suggest that GJ 504 b has a superstellar metallicity. Since planet formation can create objects with nonstellar metallicities, while binary star formation cannot, this result suggests that GJ 504 b formed like a planet, not like a binary companion. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are the University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrophisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and the Research Corporation, on behalf of the University of Notre Dame, University of Minnesota, and University of Virginia. [less ▲]

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See detailThe LEECH Exoplanet Imaging Survey: Orbit and Component Masses of the Intermediate-age, Late-type Binary NO UMa
Schlieder, Joshua E.; Skemer, Andrew J.; Maire, Anne-Lise et al

in Astrophysical Journal (2016), 818

We present high-resolution Large Binocular Telescope LBTI/LMIRcam images of the spectroscopic and astrometric binary NO UMa obtained as part of the LBT Interferometer Exozodi Exoplanet Common Hunt ... [more ▼]

We present high-resolution Large Binocular Telescope LBTI/LMIRcam images of the spectroscopic and astrometric binary NO UMa obtained as part of the LBT Interferometer Exozodi Exoplanet Common Hunt exoplanet imaging survey. Our H-, K[SUB]s[/SUB]-, and L‧-band observations resolve the system at angular separations <0.″09. The components exhibit significant orbital motion over a span of ∼7 months. We combine our imaging data with archival images, published speckle interferometry measurements, and existing spectroscopic velocity data to solve the full orbital solution and estimate component masses. The masses of the K2.0 ± 0.5 primary and K6.5 ± 0.5 secondary are 0.83 ± 0.02 M[SUB]⊙[/SUB] and 0.64 ± 0.02 M[SUB]⊙[/SUB], respectively. We also derive a system distance of d = 25.87 ± 0.02 pc and revise the Galactic kinematics of NO UMa. Our revised Galactic kinematics confirm NO UMa as a nuclear member of the ∼500 Myr old Ursa Major moving group, and it is thus a mass and age benchmark. We compare the masses of the NO UMa binary components to those predicted by five sets of stellar evolution models at the age of the Ursa Major group. We find excellent agreement between our measured masses and model predictions with little systematic scatter between the models. NO UMa joins the short list of nearby, bright, late-type binaries having known ages and fully characterized orbits. Based on data obtained with the STELLA robotic telescope in Tenerife, an AIP facility jointly operated by AIP and IAC. [less ▲]

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See detailLeeman Paul
Tomasovic, Dick ULg

in Moins, Philippe (Ed.) Image par image, le cinéma d’animation en communauté Wallonie-Bruxelles (2001)

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See detailHet Leerdercorpus Nederlands in theorie en in de praktijk
Perrez, Julien ULg; Degand, Liesbeth

Conference (2009, August 24)

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See detailHet leerdercorpus Nederlands in theorie en in de praktijk
Perrez, Julien ULg; Degand, Liesbeth

Conference (2009)

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See detailHet Leerdercorpus Nederlands
Degand, Liesbeth; Perrez, Julien ULg

Conference (2003)

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See detailHet Leerdercorpus Nederlands: Perspectieven op de tussentaal van Franstaligen
Degand, Liesbeth; Jansonius, Maarten; Perrez, Julien ULg

Conference (2004)

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See detailLeerdoelen en testformaat : De Europese Talencertificaten : Certificaat Nederlands
Hennen, Karl-Heinz; Vromans, Joseph ULg

Book published by Weiterbildungs-Testsysteme (1999)

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See detailDe leerkrachten en de pedagogisch-didaktische Vernieuwing
de Landsheere, Gilbert ULg

in Doceo (1972), 182

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See detailDe Leeuw van Waterloo. Een trefpunt van verleden, heden en toekomst
Raxhon, Philippe ULg

in Tollebeek, Jo (Ed.) België, een parcours van hennering. Plaatsen van geschiedenis en expansie (2008)

Detailed reference viewed: 37 (3 ULg)
See detailLefort et Althusser : lecteurs de Machiavel
Mancuso, Eva ULg

Scientific conference (2014, February 20)

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See detailLeft atrial dysfunction as a correlate of heart failure symptoms in hypertrophic cardiomyopathy.
Rosca, Monica; Popescu, Bogdan A.; Beladan, Carmen C. et al

in Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography (2010), 23(10), 1090-8

BACKGROUND: Hypertrophic cardiomyopathy (HCM) represents a generalized myopathic process affecting both ventricular and atrial myocardium. We aimed to assess left atrial (LA) function by two-dimensional ... [more ▼]

BACKGROUND: Hypertrophic cardiomyopathy (HCM) represents a generalized myopathic process affecting both ventricular and atrial myocardium. We aimed to assess left atrial (LA) function by two-dimensional speckle tracking echocardiography and its relation with left ventricular (LV) function and clinical status in patients with HCM. METHODS: We prospectively enrolled 37 consecutive patients with HCM and 37 normal subjects with similar age and gender distribution. Longitudinal LV strain (epsilon) and LA epsilon and strain rate (Sr) parameters (systolic, early diastolic, and late diastolic during atrial contraction) were assessed. RESULTS: Peak LAepsilon and LA Sr parameters were significantly lower in patients compared with controls (P </= .001 for all). In patients, all LA function parameters correlated with LVepsilon (P < .003 for all). Indexed LA volume, LA function parameters, and mitral regurgitation degree were the main correlates of New York Heart Association class; late diastolic strain rate during atrial contraction was the only independent predictor of symptomatic status. CONCLUSION: In patients with HCM, LA function is significantly reduced and related to LV dysfunction. Moreover, LA booster pump function emerged as an independent correlate of heart failure symptoms in this setting. [less ▲]

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See detailLeft atrial function and remodelling in aortic stenosis.
O'Connor, K.; Magne, Julien ULg; Rosca, M. et al

in European Journal of Echocardiography (2011), 12(4), 299-305

AIMS: The present study sought to determine the relationship between left atrial (LA) volume (structural changes) and LA function as assessed by strain rate imaging in patients with aortic stenosis (AS ... [more ▼]

AIMS: The present study sought to determine the relationship between left atrial (LA) volume (structural changes) and LA function as assessed by strain rate imaging in patients with aortic stenosis (AS). <br />METHODS AND RESULTS: The study consisted of a total of 64 consecutive patients with severe AS (<1 cm²) and 20 healthy control subjects. The phasic LA volumes and function (tissue Doppler-derived strain) were assessed in all patients. As compared with healthy controls, all strain-derived parameters of LA function were reduced in patients with AS. Conversely, only indexed LA passive volume (increased) (7.6 ± 3.8 vs. 10.5 ± 5.1 ml/m², P= 0.02) and LA active fraction (decreased) (43 ± 6.7 vs. 31 ± 13.3%, P< 0.001) (volume-based parameters) were significantly different between AS and controls. In AS, LA volume-derived function parameters were poorly correlated with LA strain parameters. In fact, by multivariable analysis, no LA phasic strain parameters emerged as independently associated with LA phasic volume parameters. <br />CONCLUSIONS: In AS, changes in LA function did not parallel changes in LA size. Furthermore, the increase in LA volume does not necessarily reflect the presence of intrinsic LA dysfunction [less ▲]

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See detailLeft atrial function: pathophysiology, echocardiographic assessment, and clinical applications.
Rosca, M.; Lancellotti, Patrizio ULg; Popescu, B. A. et al

in Heart (2011), 97(23), 1982-9

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See detailLeft atrial thrombus in a newborn with dilated cardiomyopathy
Rigo, Vincent ULg; Rondia, Gilles; Rigo, Jacques ULg

in Edition Spéciale SBP, Vol 1 (2008, February 29)

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See detailA left atrial thrombus too big to embolize.
Lancellotti, Patrizio ULg; Radermecker, Marc ULg; Pierard, Luc ULg

in European Heart Journal (2007), 28(13), 1660

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See detailThe left atrium: an old 'barometer' which can reveal great secrets.
Lancellotti, Patrizio ULg; Henri, Christine

in European journal of heart failure (2014)

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See detail« Left Behind »? Le rôle des non-migrants dans les dynamiques de soins transnationales
Zickgraf, Caroline ULg

in Bousetta, Hassan; Gsir, Sonia; Jacquemain, Marc (Eds.) et al Villes connectées Pratiques transnationales, dynamiques identitaires et diversité culturelle (2016)

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See detailLeft Behind? A Case Study of Immobile Populations in the Senegalese River Basin
Zickgraf, Caroline ULg

Conference (2014, August)

The Senegalese River Basin has undergone environmental transformations in recent decades that, in combination with poor infrastructure and inadequate resources, has affected the livelihood strategies and ... [more ▼]

The Senegalese River Basin has undergone environmental transformations in recent decades that, in combination with poor infrastructure and inadequate resources, has affected the livelihood strategies and mobility patterns of its residents. As a low-lying city near the mouth of the Senegal River, Saint-Louis is highly vulnerable to flooding. Furthermore, the vulnerability of the city can be attributed to coastal land degradation, high and increasing population density and inadequate infrastructure to manage wastewater, household waste, rain and river water (Dia 2007). In a complex web of migration drivers that include, but are not exclusively linked to, environmental drivers (Black et al. 2011), the region has seen migration out of rural and coastal areas for urban centers and other regions in Senegal. Yet, even if migration is understood as one potential adaptation strategy, not everyone leaves his or her community of origin. In keeping with the themes of this panel, this qualitative case study, conducted in the summer of 2014, explores who stays and why. Furthermore, it asks how the migration of some affects the vulnerability of those who stay. This paper explores alternative hypotheses regarding the impact of migration on communities of origin. Echoing the migration and development debates (de Haas 2009), but expanding them to include the specificities of climate change and, more broadly, environmental transformations, I present data from in-depth interviews with the immobile – shifting the public and academic focus from migrants to those ‘left behind’. This paper explores the relationship between the movers and the stayers within family and household configurations, in which the migration of some may allow others to stay (e.g. through remittances or through the alleviation of pressure on local resources), or may deplete the capital necessary to adapt effectively to environmental changes (e.g. the ‘brain drain’). [less ▲]

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See detailLeft inferior frontal cortex is involved in probabilistic serial reaction time learning
Peigneux, Philippe ULg; Maquet, Pierre ULg; Van der Linden, Martial ULg et al

in Brain and Cognition (1999), 40(1), 215-219

Cerebral blood flow was estimated using positron emission tomography and H2O15 infusions in 12 volunteers while they were trained on the probabilistic serial reaction time task developed by Jimenez ... [more ▼]

Cerebral blood flow was estimated using positron emission tomography and H2O15 infusions in 12 volunteers while they were trained on the probabilistic serial reaction time task developed by Jimenez, Mender, and Cleeremans (1996). Participants' reaction rimes to predictable and nonpredictable stimuli showed increasing sensitivity to the: probabilistic constraints set by previous elements of the sequence. Analysis by statistical parametric mapping showed a significant interaction between participants' performance and time effect in the left inferior frontal cortex. Our results provide the first evidence of this cerebral area being involved in the processing of contextual information in a probabilistic sequence learning task. [less ▲]

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