Population synthesis is very demanding in terms of computing power. These planetary systems can however provide access to correlations, as predicted in a given numerical framework, between the properties of planets in the same system. Using AI, we can leverage such correlations that, in return, can be used to guide and prioritize observational campaigns aiming at discovering certain types of...
In recent years, transiting circumstellar (or S-type) exoplanets in binary star systems have experienced a significant expansion, notably thanks to the successful TESS space mission. Binarity is expected to impact the formation and evolution of planets, particularly when the binary separation is smaller than a few hundred astronomical units, due to the truncation of the protoplanetary disk...
The characterization of exoplanetary masses is essential for understanding their composition and potential for atmospheric studies. The Tracking Hydrates In Refined Small Transiting Exo-Earths (THIRSTEE) programme aims to study the composition of sub-Neptunes planets. THIRSTEE is seacrhing the answers about the composition and formation of these planets around M dwarfs or Sun-like stars, their...
The search for exoplanets, planets orbiting stars outside our Solar System, has become a major focus in modern astronomy. One of the most effective techniques for detecting exoplanets is the radial velocity (RV) method, which tracks tiny shifts in a starโs RV caused by the gravitational pull of orbiting planets. The goal of this project is to compute planetary detection rates, by developing a...
Hot Jupiters are gas giant exoplanets that orbit their parent stars at very close distances, experiencing intense stellar irradiation. These extreme conditions lead to inflated radii, with most HJs exhibiting sizes larger than predicted by standard planetary cooling models. One possible mechanism contributing to this inflation is Ohmic heating, driven by the dissipation of currents generated...
Magnetic fields remain one of the least understood aspects of exoplanetary systems. A deeper understanding of planetary dynamos and the evolution of surface magnetic properties throughout a planet's lifetime is a key scientific purpose, with implications for planetary evolution, habitability, and atmospheric dynamics. This study models the evolution of magnetic fields generated by dynamo...
Due to the availability of high-performance computers and the data release from big-scale sky survey projects, the machine learning has been employed in many fields in astronomy. We have developed a numerical procedure of machine learning to search for transiting exoplanets from several survey data. Our procedure employs the convolutional neural network of deep learning techniques. In...
The search for and characterisation of extra-solar planets is at the forefront of scientific research. My research project aims to investigate astrometric possibilities for the identification of exoplanets, to get ready to fully exploit the forthcoming huge Gaia data release, foreseen to deliver thousands of new exoplanet candidates. In the anticipation of this dataset, astrometric...
TTVs provide an excellent resource to probe the dynamics of resonant exoplanet systems and characterize the masses of transiting planets. However, the masses of transiting planets can be biased by the presence of non-transiting planets in the system, leading to outliers of $ >5 \sigma$. Although existing robustness criteria based on mass and eccentricity priors work well for systems with only...
The NASA Landolt mission is an astrophysics PIONEERS program small satellite that will provide significant improvement in the accuracy of photometric measurements of absolute stellar fluxes. This will be accomplished with a NIST-calibrated suite of single-mode fiber-fed laser beacons. The satellite will be placed in a near-geosynchronous orbit with a one-year primary mission with launch no...
PLATOSpec is a new echelle spectrograph with resolving power of 70,000, installed at former ESO 1.52-m telescope at La Silla. We would like to present new results from the science verification which include observing of Rossiter-Mclaughlin effect of selected systems and also stellar activity characterisation.
Young planets form great objects to study the early stages of planetary evolution. Due to the high activity of their host stars however, they are difficult to detect observationally. Using observations from the TESS satellite, we have compiled a list of candidate planets transiting young stars. We perform vetting through several steps such as checking background flux from nearby stars for...
When a star is born, a protoplanetary disk made of gas and dust surrounds the star. The disk can show gaps opened by different astrophysical mechanisms. The gap has a wall emitting radiation which contributes to the spectral energy distribution (SED) of the whole system (star, disk and planet) in the IR band. As these new-born stars are far away from us, it is difficult to know whether the gap...
Interiors of hot stars are able to conserve their angular momentum for longer time, keeping rotational velocities high for whole lifetime. If there is a planet orbiting such star, its orbit may change significantly over time. The planet may become highly eccentric, misaligned with respect to the rotational axis of the star or even undergo tidally-induced precession. Up to date, only 4...
New computational capabilities allow now to squeeze existing data to explore other parameter spaces of the exoplanet population. Despite the extensive amount of Kepler data available, systematic searches for co-orbital exoplanets (exotrojans) remain unexplored. In this work, as part of the TROY project, we present a new detection method based on the dynamical properties of these systems. We...
The V1298 Tau system is a young, four-planet system orbiting a ~20 Myr-old star, making it an ideal laboratory for studying the formation and early evolution of planetary systems. However, current estimates of the systemโs orbital architecture remain poorly constrained. In particular, planetary eccentricities are largely unconstrained, and mass measurements have large uncertainties. Assuming...
My PhD research investigates the study of young planets from both observational and theoretical perspectives. These planets are undergoing various dynamic evolutionary processes, such as orbital migration, thermal contraction, and atmospheric loss, which provide valuable insights into the formation and early evolution of planetary systems. From the observational aspect, my research focuses on...
Variation in hot Jupiter occurrence rates across different stellar environments provides valuable insights into the formation and survival of these extreme planets. In this poster, I will present new results on the impact of the dynamical environment on hot Jupiter demographics and share preliminary findings from ongoing numerical studies exploring their formation in dense stellar systems.
Recent studies on the Solar System have shown that the ergodic assumption is not verified for the secular chaos, with quantities being almost conserved over planetary systems' lifetime. In particular, the total inclination angular momentum deficit (AMD), which describes the average mutual inclination of the orbits is almost conserved. This is an unexpected result since the variables are...
The European Space Agencyโs (ESAโs) CHaracterising ExOPlanet Satellite (CHEOPS) is the first space mission dedicated to the search for exoplanetary transits through high-precision photometry of bright stars already known to host planets. This mission enables precise radius measurements for small exoplanets (super-Earths and sub-Neptunes), mass determinations for systems with transit timing...
Aprecise transit ephemeris serves as the premise for follow-up exoplanet observations. We compare TESS Object of Interest (TOI) transit timings of 262 hot Jupiters with the archival ephemeris and find 31 of them having TOI timing offsets, among which WASP-161b shows the most significant offset of โ203.7 ยฑ4.1 minutes. The median value of these offsets is 17.8 minutes, equivalent to 3.6ฯ. We...
The increasing discovery of extrasolar systems has made it necessary to study their stability. In this work, we present a generalization of the AMD-stability criterion defined by Laskar and Petit (2017), which defines a critical AMD-value below which close encounters are prevented and the system can be considered stable. This secular approach does not take into account mean-motion resonance...
Using the software REBOUND [1] we explore the possible stable configurations for the 2/1, 1/2 and 1/1 retrograde mean motion resonances in planetary systems with arbitrary masses through a Monte Carlo method. The simulations were divided in two different cases: 1) varying mass of one planet; 2) varying masses for both planets. The upper limit for the masses was set to 0.012 Msun as this is...
Binary stars are common and the number of systems with circumbinary planets is bound to increase with the advent of new missions like TESS, JWST. The indirect inference of planets around post-common envelope (CE) binaries has motivated investigations into their origin and survival in such violent environments. The potential existence of planets raises the question of whether the planets...
In the coming months, the first programmable liquid-crystal active coronagraph imager will begin operations at the DAO telescope (PLACID; Tandon et al. 2024). This instrument will potentially expand the capabilities for imaging planets and discs in complex environments, such as multiple star systems. This poster presents the framework of an observational program aimed at detecting planets and...
The Galactic Center contains a dense cluster of massive stars orbiting the central supermassive black hole, Sagittarius A$^\star$, collectively known as the S-cluster. While massive stars elsewhere in the Galaxy frequently reside in binary systems, the S-cluster appears to lack such companions. Among the S-cluster stars is S2, one of the most well-studied due to its close approach to...
