A5049961156- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Technology Assessment and Management
- High-pressure geophysics and materials
Université de Montréal
2024
McGill University
2020-2024
Western University
2020
Space Science Institute
2020
NASA Exoplanet Science Institute
2020
Abstract The two-planet transiting system LHS 1140 has been extensively observed since its discovery in 2017, notably with Spitzer, HST, TESS, and ESPRESSO, placing strong constraints on the parameters of M4.5 host star small temperate exoplanets, b c. Here, we reanalyze ESPRESSO observations novel line-by-line framework designed to fully exploit radial velocity content a stellar spectrum while being resilient outlier measurements. improved velocities, combined updated parameters,...
Abstract Exoplanet demographic surveys have revealed that close-in (≲1 au) small planets orbiting stars in the Milky Way’s thick disk are ∼50% less abundant than those Galactic thin disk. One key difference between two stellar populations is time at which they emerged: thick-disk likely product of cosmic noon (redshift z ∼ 2), an era characterized by high star formation rate, massive and dense molecular clouds, strong supersonic turbulence. Solving for background radiation field these early...
Abstract The sub-Saturn (∼4–8 R ⊕ ) occurrence rate rises with orbital period out to at least ∼300 days. In this work we adopt and test the hypothesis that decrease in their toward star is a result of atmospheric mass loss, which can transform sub-Saturns into sub-Neptunes (≲4 more efficiently shorter periods. We show under mass-loss hypothesis, be leveraged infer underlying core function, and, by extension, gas giants. determine lognormal functions peaked near ∼10–20 M are compatible...
Abstract The low velocity of interstellar asteroid 1I/’Oumuamua with respect to our galaxy’s local standard rest implies that it is young. Adopting the young age hypothesis, we assess possible origin systems for this and 2I/Borisov, though latter’s higher speed means unlikely be First, their past trajectories are modeled under gravitational scattering by galactic components (“disk heating”) how far back one can trace them. stochastic nature disk heating a integration only expect accurate...
Abstract The giant planet occurrence rate rises with orbital period out to at least ∼300 days. Large-scale planetary migration through the disk has long been suspected be origin of this feature, as timescale standard Type I in a solar nebula is longer farther from star. These calculations also find that typical Jupiter-bearing cores shuttle toward inner edge on timescales orders magnitude shorter than gas lifetime. presence giants myriad distances requires mechanisms slow large-scale...
Exoplanet demographic surveys have revealed that close-in (${\lesssim}$1 au) small planets orbiting stars in the Milky Way's thick disk are ${\sim}50\%$ less abundant than those Galactic thin disk. One key difference between two stellar populations is time at which they emerged: likely product of cosmic noon (redshift $z {\sim}2$), an era characterized by high star formation rate, massive and dense molecular clouds, strong supersonic turbulence. Solving for background radiation field these...
The two-planet transiting system LHS 1140 has been extensively observed since its discovery in 2017, notably with $Spitzer$, HST, TESS, and ESPRESSO, placing strong constraints on the parameters of M4.5 host star small temperate exoplanets, b c. Here, we reanalyse ESPRESSO observations novel line-by-line framework designed to fully exploit radial velocity content a stellar spectrum while being resilient outlier measurements. improved velocities, combined updated parameters, consolidate our...