New Views into Stellar Rotation from Mixed-Mode Asteroseismology
by
Tsung-Dao Lee Institute/N6F-N600 - Lecture Room
Tsung-Dao Lee Institute
Host: Dong Lai
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Abstract:
Asteroseismology --- the analysis and interpretation of stellar oscillations --- remains the only means by which we may directly inspect the properties of stellar interiors. I will describe new theoretical developments regarding the interpretation of asteroseismic rotational signatures in a particular class of variable stars --- red-giant solar-like oscillators. While waves in most variable stars propagate in a single mode cavity, I formulate a description of multicavity oscillations in these red giants by way of a physical analogy where they behave as "acoustic molecular orbitals". I describe two recent observational results which this formalism has helped us to interpret: 1. the detection of engulfment signatures in evolved red giants, and 2. direct constraints on the misalignment angle between the rotational axis of the core and of the envelope, in the central star of a spin-orbit-misaligned planetary system.
Biography:
Joel Ong is an incoming ARC DECRA Fellow at the University of Sydney. Prior to this, he was a NASA Hubble Fellow at the University of Hawaiʻi --- the first Singaporean to have been awarded a Hubble Fellowship. Dr. Ong received his PhD from Yale University, and his undergraduate education at the National University of Singapore.
