Abstract Details
| Name: Trisha Bhowmik Affiliation: Universidad Diego Portales Conference ID: ASI2025_411 Title : Understanding planet and satellite formation with ALMA and VLT Authors and Co-Authors : Trisha Bhowmik 1,2, Lucas Cieza 1,2, Anuroop Dasgupta 1,2, Prachi Chavan 1,2 Abstract Type : Oral Abstract Category : Sun, Solar System, Exoplanets, and Astrobiology Abstract : In our solar system, terrestrial and giant planets differ in architecture and chemistry. To understand this, we must study planet-forming disks and their structural variation. As part of the ODISEA project (Ophiuchus DIsk Survey Employing ALMA), I present 55 faint disks at 0.05” (7 au) resolution and 45 brighter disks at 0.2” (28 au) resolution at 400 GHz. This study uniquely analyzes the images and radial profiles of 100 disks in a single molecular cloud, investigating how disk substructures evolve with disk sizes, mass, and SED Class. Theoretically, we anticipate a higher population of young embedded (≤ 1 Myr) featureless disks compared to evolved Class II (a few Myr) featureless disks. However, we observe a similar population of embedded (52%) and Class II (48%) featureless disks (Bhowmik et al in prep.). One explanation could be the presence of pressure bumps that halt grain growth and structural evolution in the disks. Further insight into our solar system’s 200+ moons suggests that giant exoplanets may also have exo-satellites. Despite successful high-contrast imaging (HCI) of giant planets and brown dwarfs (BDs), exo-satellites remain undetected. Recently observed triple systems like ε Indi and GJ569 inspire searches for massive exo-satellites, particularly around BDs. We employ a negative fake injection technique to suppress companions’ (BD or planet) brightness using observed stellar PSFs in the search for exo-satellites. Our sample includes over ten BDs and exoplanets observed by SPHERE/VLT’s integral field spectrograph (IFS), targeting objects like GQ Lup B and PZ Tel B. I will present post-processed residual images treated with angular spectral differential imaging and negative fake injection. I will focus on companion surroundings, contrast curves, and mass-limited plots to identify exo-satellites around these companions. |