TOI-849b is one of the few planets populating hot-Neptune desert and it densest Neptune-sized discovered so far. Its extraordinary proximity to host star, together with absence a massive H/He envelope on top $40.8 ~M_{\oplus}$ rocky core calls into question role played by star in evolution system. We aim study impact star's rotational history TOI-849b, focussing planetary migration due dynamica...

It is commonly accepted that exoplanets with orbital periods shorter than 1 day, also known as ultra-short period (USP) planets, formed further out within their natal protoplanetary disk, before migrating to current-day orbits via dynamical interactions. One of the most theories suggests a violent scenario involving high-eccentricity migration followed by tidal circularization. Here, we present...

K2-136 is a late-K dwarf ($0.742\pm0.039$ M$_\odot$) in the Hyades open cluster with three known, transiting planets and an age of $650\pm70$ Myr. Analyzing K2 photometry, we found that K2-136b, c, d have periods $8.0$, $17.3$, $25.6$ days radii $1.014\pm0.050$ R$_\oplus$, $3.00\pm0.13$ $1.565\pm0.077$ respectively. We collected 93 radial velocity measurements (RVs) HARPS-N spectrograph (TNG) 2...

Studies of close-in planets orbiting M dwarfs have suggested that the dwarf radius valley may be well-explained by distinct formation timescales between enveloped terrestrials, and rocky form at late times in a gas-depleted environment. This scenario is odds with picture primordial gaseous envelope subsequently stripped away some thermally-driven mass loss process. These two physical scenarios ...

We develop a representation theoretic technique for detecting closed orbits that is applicable in all characteristics. Our based on Kempf’s theory of optimal subgroups and we make some improvements simplify the from computational perspective. exhibit our many examples particular, give an algorithm to decide if symmetric polynomial $n$-variables has $\operatorname{SL}\_n$-orbit. As important app...

One of the long-term goals exoplanet science is atmospheric characterization dozens small exoplanets in order to understand their diversity and search for habitable worlds potential biosignatures. Achieving this goal requires a space mission sufficient scale. We seek quantify detection performance space-based mid-infrared nulling interferometer that measures thermal emission exoplanets. For thi...

The number of potentially habitable planets continues to increase, but we lack the time and resources characterize all them. With $\sim$30 known an ever-growing candidate confirmed planets, a robust statistical framework for prioritizing characterization these is desirable. Using $\sim$2 Gy it took life on Earth make detectable impact atmosphere as benchmark, use Bayesian method determine proba...