Jean‐Philippe Beaulieu
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View article: MOA-2010-BLG-328: Keck and HST Expose the Limits of Occams Razor in Microlensing
MOA-2010-BLG-328: Keck and HST Expose the Limits of Occams Razor in Microlensing Open
We present high-resolution follow-up data of the microlensing event MOA-2010-BLG-328, using Keck and the Hubble Space Telescope. Keck data, taken 8 yr after the event, reveal a strong lens detection enabling measurement of lens flux and so…
View article: Constraints on the possible atmospheres on TRAPPIST-1 b: insights from 3D climate modeling
Constraints on the possible atmospheres on TRAPPIST-1 b: insights from 3D climate modeling Open
JWST observations of the secondary eclipse of TRAPPIST-1 b at 12.8 and 15 microns revealed a very bright dayside. These measurements are consistent with an absence of atmosphere. Previous 1D atmospheric modeling also excludes -- at first s…
View article: OGLE-2014-BLG-1760: A Jupiter–Sun Analogue Residing in the Galactic Bulge
OGLE-2014-BLG-1760: A Jupiter–Sun Analogue Residing in the Galactic Bulge Open
We present the analysis of OGLE-2014-BLG-1760, a planetary system in the galactic bulge. We combine Keck Adaptive Optics follow-up observations in K -band with re-reduced light-curve data to confirm the source and lens star identifications…
View article: Constraints on the possible atmospheres on TRAPPIST-1 b: insights from 3D climate modeling
Constraints on the possible atmospheres on TRAPPIST-1 b: insights from 3D climate modeling Open
Context. JWST observations of the secondary eclipse of TRAPPIST-1 b at 12.8 and 15 µm revealed a very bright dayside. These measurements are consistent with an absence of atmosphere. Previous 1D atmospheric modeling also excludes – at firs…
View article: Analysis of disequilibrium chemistry in five exoplanets’ atmosphere
Analysis of disequilibrium chemistry in five exoplanets’ atmosphere Open
Studying chemical composition is fundamental to model the formation history of planets and planetary systems. With the first JWST data and the upcoming Ariel satellite, we expect a leap forward in the exoplanet’s atmosphere field. Most cur…
View article: Assessing the impact of instrumental systematics on Ariel spectrometer performance using simulated observations
Assessing the impact of instrumental systematics on Ariel spectrometer performance using simulated observations Open
Ariel is a European Space Agency (ESA) mission that aims to study the atmospheres of a large and diverse sample of transiting exoplanets (Tinetti et al. 2021). Scheduled for launch in 2029 to the L2 Lagrange point. Ariel will observe exopl…
View article: From atmospheres to exospheres in exoplanets
From atmospheres to exospheres in exoplanets Open
Interaction phenomena between atmospheric layers in planetary atmospheres give rise to highly complex exchanges influencing thermal structure, composition and dynamics. In particular, the question of hydrodynamic escape in exoplanet atmosp…
View article: ML approaches for exoplanet atmosphere characterization and detrending methods in the Ariel space mission
ML approaches for exoplanet atmosphere characterization and detrending methods in the Ariel space mission Open
The Ariel space mission is a European Space Agency (ESA) mission that aims to study the atmospheres of a large and diverse sample of transiting exoplanets (Tinetti et al. 2021). Scheduled for launch in 2029 to the L2 Lagrange point, Ariel …
View article: OGLE-2016-BLG-1195Lb: A Sub-Neptune Beyond the Snow Line of an M-dwarf Confirmed by Keck Adaptive Optics
OGLE-2016-BLG-1195Lb: A Sub-Neptune Beyond the Snow Line of an M-dwarf Confirmed by Keck Adaptive Optics Open
We present the analysis of high-resolution follow-up observations of OGLE-2016-BLG-1195 using Laser Guide Star Adaptive Optics with Keck, seven years after the event’s peak. We resolve the lens, measuring its flux and the relative source-l…
View article: TASSIE: a TASmanian Search for Inclined Exoplanets
TASSIE: a TASmanian Search for Inclined Exoplanets Open
We present the first results of a pilot 'TASmanian Search for Inclined Exoplanets' (TASSIE) program. This includes observations and analysis of five short-period exoplanet candidates using data from TESS and the Harlingten 50 cm telescope …
View article: Analysing the flux stability of stellar calibrator candidates with TESS
Analysing the flux stability of stellar calibrator candidates with TESS Open
Context . The ESA space mission Ariel requires bright sources that are stable at the level of 100 ppm over 6 hours in order to accurately measure exoplanet atmospheres through transmission spectroscopy. To ensure this, in-flight instrument…
View article: OGLE-2014-BLG-1760: A Jupiter-Sun analogue residing in the Galactic Bulge
OGLE-2014-BLG-1760: A Jupiter-Sun analogue residing in the Galactic Bulge Open
We present the analysis of OGLE-2014-BLG-1760, a planetary system in the galactic bulge. We combine Keck Adaptive Optics follow-up observations in $K$-band with re-reduced light curve data to confirm the source and lens star identification…
View article: A Candidate High-velocity Exoplanet System in the Galactic Bulge
A Candidate High-velocity Exoplanet System in the Galactic Bulge Open
We present an analysis of adaptive optics images from the Keck I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. reports two possibilities for the lens system: a nearby gas giant lens wi…
View article: TASSIE: a TASmanian Search for Inclined Exoplanets
TASSIE: a TASmanian Search for Inclined Exoplanets Open
We present the first results of a pilot ‘TASmanian Search for Inclined Exoplanets’ (TASSIE) program. This includes observations and analysis of five short-period exoplanet candidates using data from TESS and the Harlingten 50 cm telescope …
View article: Image-Constrained Modeling with Hubble and Keck Images Reveals that OGLE-2012-BLG-0563Lb is a Jupiter-Mass planet Orbiting a K Dwarf
Image-Constrained Modeling with Hubble and Keck Images Reveals that OGLE-2012-BLG-0563Lb is a Jupiter-Mass planet Orbiting a K Dwarf Open
We present high angular resolution imaging from the {\sl Hubble Space Telescope} combined with adaptive optics imaging results from the {\sl Keck}-II telescope to determine the mass of the OGLE-2012-BLG-0563L host star and planet to be $M_…
View article: A Candidate High-Velocity Exoplanet System in the Galactic Bulge
A Candidate High-Velocity Exoplanet System in the Galactic Bulge Open
We present an analysis of adaptive optics (AO) images from the Keck-I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. 2014 reports two distinct possibilities for the lens system; a nearb…
View article: <i>Euclid</i>
<i>Euclid</i> Open
The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015–2025…
View article: Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth
Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth Open
We present an analysis of high-angular-resolution images of the microlensing target MOA-2007-BLG-192 using Keck adaptive optics and the Hubble Space Telescope. The planetary host star is robustly detected as it separates from the backgroun…
View article: Keck and Hubble Observations Show that MOA-2008-BLG-379Lb is a Super-Jupiter Orbiting an M Dwarf
Keck and Hubble Observations Show that MOA-2008-BLG-379Lb is a Super-Jupiter Orbiting an M Dwarf Open
We present high angular resolution imaging that detects the MOA-2008-BLG-379L exoplanet host star using Keck adaptive optics and the Hubble Space Telescope. These observations reveal host star and planet masses of M host = 0.434 ± 0.065 M …
View article: Euclid. I. Overview of the Euclid mission
Euclid. I. Overview of the Euclid mission Open
The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015-2025…
View article: Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth
Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth Open
We present an analysis of high angular resolution images of the microlensing target MOA-2007-BLG-192 using Keck adaptive optics and the Hubble Space Telescope. The planetary host star is robustly detected as it separates from the backgroun…
View article: A re-analysis of equilibrium chemistry in five exoplanets' atmosphere
A re-analysis of equilibrium chemistry in five exoplanets' atmosphere Open
Studying chemical composition is fundamental to modeling the formation history of planets and planetary systems. With the first JWST data and the upcoming Ariel satellite, we expect a leap forward in the exoplanet’s atmosphere field.…
View article: Precise Mass Measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: A Saturn-mass Planet Orbiting an M Dwarf
Precise Mass Measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: A Saturn-mass Planet Orbiting an M Dwarf Open
We revisit the planetary microlensing event OGLE-2013-BLG-0132/MOA-2013-BLG-148 using Keck adaptive optics imaging in 2013 with NIRC2 and in 2020, 7.4 yr after the event, with OSIRIS. The 2020 observations yield a source and lens separatio…
View article: Euclid Spectroscopic Image Simulations and Reconstruction
Euclid Spectroscopic Image Simulations and Reconstruction Open
Parallel Talk presented at the XX International Workshop on Neutrino Telescopes - Venice 23-27 October 2023 Abstract: Euclid is a European Space Agency (ESA) mission, designed to investigate the nature of Dark Energy and Dark Matter. It wi…
View article: Precise mass measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: a Saturn mass planet orbiting an M-dwarf
Precise mass measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: a Saturn mass planet orbiting an M-dwarf Open
We revisit the planetary microlensing event OGLE-2013-BLG-0132/MOA-2013-BLG-148 using Keck adaptive optics imaging in 2013 with NIRC2 and in 2020, 7.4 years after the event, with OSIRIS. The 2020 observations yield a source and lens separa…
View article: ARES VI: Viability of one-dimensional retrieval models for transmission spectroscopy characterization of exo-atmospheres in the era of JWST and Ariel
ARES VI: Viability of one-dimensional retrieval models for transmission spectroscopy characterization of exo-atmospheres in the era of JWST and Ariel Open
Observed exoplanet transit spectra are usually retrieved using 1D models to determine atmospheric composition while planetary atmospheres are 3D. With the JWST and future space telescopes such as Ariel, we will be able to obtain increasing…
View article: ARES
ARES Open
Observed exoplanet transit spectra are usually retrieved using 1D models to determine atmospheric composition. However, planetary atmospheres are 3D. With the new state-of-the-art James Webb Space Telescope (JWST) and future space telescop…
View article: Keck and Hubble Observations Show That MOA-2008-BLG-379Lb Is a Super-Jupiter Orbiting an M Dwarf
Keck and Hubble Observations Show That MOA-2008-BLG-379Lb Is a Super-Jupiter Orbiting an M Dwarf Open
We present high angular resolution imaging that detects the MOA-2008-BLG-379L exoplanet host star using Keck adaptive optics and the Hubble Space Telescope. These observations reveal host star and planet masses of $M_{\rm host}=0.434\pm0.0…
View article: Hunting for Cold Exoplanets via Microlensing
Hunting for Cold Exoplanets via Microlensing Open
Microlensing can detect planets at distances ranging from a few hundred parsecs all the way to the Galactic center. The maximum sensitivity is reached for systems that are located half way to the galactic center, with planets orbiting the …
View article: A re-analysis of equilibrium chemistry in five hot Jupiters
A re-analysis of equilibrium chemistry in five hot Jupiters Open
Aims. Studies of chemistry and chemical composition are fundamental to exploring the formation histories of planets and planetary systems. We propose having another look at five targets to better determine their composition and the chemica…