Jean‐Philippe Beaulieu
A5062938947- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Historical and Literary Studies
- Historical and Literary Analyses
- History and Developments in Astronomy
- Historical Studies and Socio-cultural Analysis
- French Urban and Social Studies
- Renaissance Literature and Culture
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric Ozone and Climate
- Medieval European Literature and History
- European Political History Analysis
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Linguistics and Discourse Analysis
- French Literature and Criticism
- Psychoanalysis and Psychopathology Research
Centre National de la Recherche Scientifique
2015-2024
Institut d'Astrophysique de Paris
2015-2024
Sorbonne Université
2015-2024
University of Tasmania
2016-2024
Université de Montréal
1998-2023
Observatoire de Paris
2015-2017
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2015-2017
Janssen (France)
2015-2017
Université Paris Cité
2017
Ministère des Ressources naturelles et des Forêts
2017
Aims. The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called "machos") could be a major component of dark matter Milky Way galaxy. To this end, monitored over 6.7 years stars in Magellanic clouds for microlensing events caused by such objects.
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing all except Mercury. We report detection a with microlensing. identify two masses ∼0.71 and ∼0.27 times mass Jupiter orbital separations ∼2.3 ∼4.6 astronomical units orbiting primary star ∼0.50 at distance ∼1.5 kiloparsecs. This...
Thousands of exoplanets have now been discovered with a huge range masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface their host star. However, essential nature these remains largely mysterious: there is no known, discernible pattern linking presence, size, or orbital parameters planet its parent We little idea whether chemistry linked formation environment, type star drives physics planet's birth, evolution. ARIEL was conceived observe number...
We present the first measurement of planet frequency beyond "snow line," for planet-to-star mass-ratio interval −4.5 < log q −2, corresponding to range ice giants gas giants. find at mean mass ratio = 5 × 10−4 with no discernible deviation from a flat (Öpik's law) distribution in log-projected separation s. The determination is based on sample six planets detected intensive follow-up observations high-magnification (A>200) microlensing events during 2005–2008. sampled host stars have typical...
Abstract We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). used Hubble Space Telescope (HST) to carry out precise astrometry source star long-duration ( t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in direction Galactic bulge. HST imaging, conducted at eight epochs over interval 6 yr, reveals a clear relativistic astrometric deflection...
The current standard model of cosmology successfully describes a variety measurements, but the nature its main ingredients, dark matter and energy, remains unknown. is medium-class mission in Cosmic Vision 2015--2025 programme European Space Agency (ESA) that will provide high-resolution optical imaging, as well near-infrared imaging spectroscopy, over about 14\,000\,deg$^2$ extragalactic sky. In addition to accurate weak lensing clustering measurements probe structure formation half age...
We report the discovery of a several-Jupiter-mass planetary companion to primary lens star in microlensing event OGLE-2005-BLG-071. Precise (≲1%) photometry at peak yields an extremely high signal-to-noise ratio detection deviation from light curve expected isolated lens. The character this is easily and unambiguously discernible gross features curve. Detailed modeling tightly constrained planet-star mass q = mp/M 0.0071 ± 0.0003. This second robust planet with microlensing, demonstrating...
We report the detection of an extrasolar planet mass ratio q ~ 2 x 10^(-4) in microlensing event MOA-2007-BLG-192. The best fit model shows both parallax and finite source effects, these can be combined to obtain lens masses M = 0.060 (+0.028 -0.021) M_sun for primary m 3.3 (+4.9 -1.6) M_earth planet. However, observational coverage planetary deviation is sparse incomplete, radius was estimated without benefit a star color measurement. As result, 2-sigma limits on measurements are weak....
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with planet–star mass ratio q = [9.5 ± 2.1] × 10−5 via gravitational microlensing. The planetary deviation was detected in real-time thanks to high cadence Microlensing Observations Astrophysics survey, light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns stellar distance at Ml 0.64+0.21−0.26 M☉ Dl 5.9+0.9−1.4 kpc, respectively, so separation are Mp 20+7−8 M⊕ 3.3+1.4−0.8 AU,...
The EROS and MACHO collaborations have each published upper limits on the amount of planetary mass dark matter in Galactic Halo obtained from gravitational microlensing searches. In this paper two are combined to give a much stronger constraint abundance low MACHOs.
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, second planet discovered by microlensing and first in a high-magnification event. These include photometric astrometric measurements from Hubble Space Telescope, as well constraints higher order effects extracted ground-based light curve, such microlens parallax, planetary orbital motion finite-source effects. Our primary analysis leads conclusion that host Jovian OGLE-2005-BLG-071Lb is an M dwarf foreground...
We present the first microlensing candidate for a free-floating exoplanet–exomoon system, MOA-2011-BLG-262, with primary lens mass of Mhost ∼ 4 Jupiter masses hosting sub-Earth moon. The argument an exomoon hinges on system being relatively close to Sun. data constrain product MLπrel where ML is and πrel lens–source relative parallax. If nearby (large πrel), then small (a few masses) companion sub-Earth-mass exomoon. best-fit solution has large proper motion, μrel = 19.6 ± 1.6 mas yr−1,...
Aims. We report the discovery of a planet with high planet-to-star mass ratio in microlensing event MOA-2009-BLG-387, which exhibited pronounced deviations over 12-day interval, one longest for any planetary event. The host is an M dwarf, range 0.07 M⊙ < Mhost 0.49 at 90% confidence. planet-star q = 0.0132 ± 0.003 has been measured extremely well, so best-estimated mass, mp 2.6 Jupiter masses median 0.19 M⊙.
We present the first example of binary microlensing for which parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible a confluence two relatively unusual circumstances. First, lens bright enough (I=15.6) to permit measurements. Second, we measure not only usual 7 binary-lens parameters, but also 'microlens parallax' (which yields mass) and components instantaneous orbital velocity. Thus measure, effectively, 6 'Kepler+1' parameters...
We present Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) observations of the source and lens stars for planetary microlensing event OGLE-2005-BLG-169, which confirm relative proper motion prediction due to light curve signal observed this event. This (and companion Keck result) provide first confirmation a signal, deviation was only 2%. The follow-up determine flux host star in multiple passbands remove model ambiguity caused by sparse sampling part curve. leads precise...
Parallax is the most fundamental technique for measuring distances to astronomical objects. Although terrestrial parallax was pioneered over 2000 years ago by Hipparchus (ca. 140 B.C.E.) measure distance Moon, baseline of Earth so small that can generally only be applied objects in Solar System. However, there exists a class extreme gravitational microlensing events which effects readily detected and permit measurement distance, mass, transverse velocity lens. Here we report observations...
We present the discovery and mass measurement of cold, low-mass planet MOA-2009-BLG-266Lb, performed with gravitational microlensing method. This has a mp = 10.4 ± 1.7 M⊕ orbits star M⋆ 0.56 0.09 M☉ at semimajor axis AU an orbital period yrs. The host measurements are enabled by parallax effect, which is seen primarily in light curve distortion due to motion Earth. But analysis also demonstrates capability measure Deep Impact (or EPOXI) spacecraft heliocentric orbit. distance similar...
We present an analysis of seven primary transit observations the hot Neptune GJ436b at 3.6, 4.5, and 8 μm obtained with Infrared Array Camera on Spitzer Space Telescope. After correcting for systematic effects, we fitted light curves using Markov Chain Monte Carlo technique. Combining these new data EPOXI, Hubble Telescope, ground-based V, I, H, Ks published observations, range 0.5–10 can be covered. Due to low level activity GJ436, effect starspots combination transits different epochs is...
We present Keck NIRC2 high angular resolution adaptive optics observations of the microlensing event OGLE-2005-BLG-169Lb, taken 8.21 years after discovery this planetary system. For first time for a event, source and lens are completely resolved, providing precise measurement their heliocentric relative proper motion, mas yr−1. This confirms refines initial model presented in paper rules out range solutions that were allowed by light curve. is also parameters derived from signal confirmed,...