Bulletin of the American Physical Society
88th Annual Meeting of the Southeastern Section of the APS
Volume 66, Number 16
Thursday–Saturday, November 18–20, 2021; University Center Club, Florida State University, Tallahassee, Florida
Session K04: Exoplanets I |
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Chair: Cassandra Hall, University of Georgia Room: Pensacola |
Friday, November 19, 2021 11:00AM - 11:30AM |
K04.00001: Characterizing exoplanets and brown dwarfs Invited Speaker: Theodora Karalidi In the 25 years since the discovery of the first exoplanet and brown dwarf,our atmospheric models have developed considerably. We are in the era wheredevelopments in atmospheric models are data driven. In this talk, I will discusshow high signal-to-noise-ratio observations of brown dwarfs have informed ourmodels in the last decade and why these model updates are crucial for ourunderstanding of imaged atmospheres. I will discuss how the knowledge we get frombrown dwarfs today, can be used in the coming era when JWST and the largeground-based telescopes will get comparable quality data for imaged exoplanets towhat we already get for brown dwarfs. Finally, I will discuss how high-resolutionobservations will help us constrain the 3D structure of brown dwarf andexoplanet atmospheres. [Preview Abstract] |
Friday, November 19, 2021 11:30AM - 12:00PM |
K04.00002: The Lifetimes of Planetary Systems around Small Stars Invited Speaker: Sarah Ballard The Solar System furnishes our most familiar planetary architecture: many planets, orbiting nearly coplanar to one another. However, a typical system of planets in the Milky Way orbits a much smaller M dwarf. These stars present a very different blueprint in key ways when compared to the conditions that nourished evolution of life on Earth. Using ensemble studies of hundreds-to-thousands of exoplanets orbiting small stars, my research program investigates the links between planet formation from disks, orbital dynamics and stability of planetary systems, and the presence and observability of their atmospheres. These processes bear upon the potential for M dwarf systems to evolve and sustain living things. Studies of exoplanets with the James Webb Space Telescope comprise the clear next step toward understanding the hospitability of the Milky Way to life. Our success hinges upon leveraging the many thousands of planet discoveries in hand to determine how to use this precious and limited resource. [Preview Abstract] |
Friday, November 19, 2021 12:00PM - 12:15PM |
K04.00003: Constraining Protoplanetary Disc Mass Using the GI Wiggle Jason Terry, Cassandra Hall, Cristiano Longarini, Giuseppe Lodato, Claudia Toci, Benedetta Veronesi, Teresa Paneque-CarreƱo, Christophe Pinte Exoplanets form in protoplanetary accretion discs. The total protoplanetary disc mass is the most fundamental parameter, since it sets the mass budget for planet formation. Although observations with the Atacama Large Millimeter/Submillimeter array (ALMA) have dramatically increased our understanding of these discs, total protoplanetary disc mass remains difficult to measure. If a disc is sufficiently massive ($\gtrsim$ 10\% of the host star mass), it can excite gravitational instability (GI). Recently, it has been revealed that GI leaves kinematic imprints of its presence known as the ``GI Wiggle.'' In this work, we use numerical simulations to determine an approximately linear relationship between the amplitude of the wiggle and the host disc-to-star mass ratio, and show that measurements of the amplitude are possible with the spatial and spectral capabilities of ALMA. These measurements can therefore be used to constrain disc-to-star mass ratio. [Preview Abstract] |
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