Emmanuël Jehin
A5023266968- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Space Exploration and Technology
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- History and Developments in Astronomy
- Spacecraft and Cryogenic Technologies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Astronomical and nuclear sciences
- Geomagnetism and Paleomagnetism Studies
- Radioactive contamination and transfer
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
University of Liège
2015-2024
McDonald's (United States)
2023
Adıyaman University
2023
Odlewnie Polskie (Poland)
2023
Campbell Collaboration
2022
Centre de Recherche en Astronomie Astrophysique et Géophysique
2013-2021
Royal Observatory of Belgium
2020
Institut d'Astrophysique Spatiale
2011-2019
Manchester Metropolitan University
2019
Keele University
2019
Abstract We have collected transit times for the TRAPPIST-1 system with Spitzer Space Telescope over four years. add to these ground-based, HST, and K2 transit-time measurements, revisit an N -body dynamical analysis of seven-planet using our complete set from which we refine mass ratios planets star. next carry out a photodynamical light curves derive density host star planet densities. find that all seven planets’ densities may be described single rocky mass–radius relation is depleted in...
Context. The TRAPPIST-1 system hosts seven Earth-sized, temperate exoplanets orbiting an ultra-cool dwarf star. As such, it represents a remarkable setting to study the formation and evolution of terrestrial planets that formed in same protoplanetary disk. While sizes are all known better than 5% precision, their densities have significant uncertainties (between 28% 95%) because poor constraints on planet's masses. Aims.The goal this paper is improve our knowledge planetary masses using...
We present the discovery by WASP-South survey, in close collaboration with Euler and TRAPPIST telescopes, of WASP-121 b, a new remarkable short-period transiting hot Jupiter, whose planetary nature has been statistically validated PASTIS software. The planet mass $1.183_{-0.062}^{+0.064}$ $M_{\mathrm{Jup}}$, radius 1.865 $\pm$ 0.044 $R_{\mathrm{Jup}}$, transits every $1.2749255_{-0.0000025}^{+0.0000020}$ days an active F6-type main-sequence star ($V$=10.4, $1.353_{-0.079}^{+0.080}$...
Determining the architecture of multi-planetary systems is one cornerstones understanding planet formation and evolution. Resonant are especially important as fragility their orbital configuration ensures that no significant scattering or collisional event has taken place since earliest phase when parent protoplanetary disc was still present. In this context, TOI-178 been subject particular attention first TESS observations hinted at a 2:3:3 resonant chain. Here we report results from...
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, DART spacecraft impacted Dimorphos, secondary member Didymos near-Earth binary system, demonstrating an autonomously navigated kinetic impact into with limited prior knowledge for defense. Months subsequent Earth-based...
On 4 July 2005, many observatories around the world and in space observed collision of Deep Impact with comet 9P/Tempel 1 or its aftermath. This was an unprecedented coordinated observational campaign. These data show that (i) there new material after impact compositionally different from seen before impact; (ii) ratio dust mass to gas ejecta much larger than (iii) activity did not last more a few days, by 9 comet's behavior indistinguishable pre-impact behavior; (iv) were interesting...
We report on the discovery of GJ 3470 b, a transiting hot Uranus mass mp = 14.0 ± 1.8 M⊕, radius Rp 4.2 0.6 R⊕ and period P 3.3371 0.0002 day. Its host star is nearby (d 25.2 2.9 pc) M1.5 dwarf M⋆ 0.54 0.07 M⊙ R⋆ 0.50 0.06 R⊙. The detection was made during radial-velocity campaign with Harps that focused search for short-period planets orbiting M dwarfs. Once planet discovered transit-search window narrowed to about 10% an orbital period, photometric started Trappist quickly detected ingress...
The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding these planets' compositions, energy budgets, and dynamics, we are carrying out an intensive photometric monitoring campaign their transits $\textit{Spitzer Space Telescope}$. In this context, present 60 new observed $\textit{Spitzer}$/IRAC in...
We present TRICERATOPS, a new Bayesian tool that can be used to vet and validate TESS Objects of Interest (TOIs). test the on 68 TOIs have been previously confirmed as planets or rejected astrophysical false positives. By looking in positive probability (FPP) -- nearby (NFPP) plane, we define criteria must meet classified validated (FPP < 0.015 NFPP 10^-3), likely 0.5 positives (NFPP > 10^-1). apply this procedure 384 unclassified statistically 12, classify 125 planets, 52 Of 12 9 are newly...
We observed the transiting super-Earth exoplanet GJ1214b using warm Spitzer at 4.5 μm wavelength during a 20 day quasi-continuous sequence in 2011 May. The goals of our long observation were to accurately define infrared transit radius this nearby super-Earth, search for secondary eclipse, and other planets habitable zone GJ1214. here report results from monitoring GJ1214b, including reanalysis previous observations by Désert et al. In total, we analyze 14 transits μm, 3 3.6 7 new...