Department of Astronomy

Yale University

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I am a Professor in the Department of Astronomy of Yale University and the current Chair of the department. I am also a member of the Board of Directors of the Assiciation of Universities for Research in Astronomy (AURA).

I was educated in  India and held postdoctoral positions in Queen Mary College, London,  U.K. and the Theoretical Astrophysics Centre (TAC) at the University of Aarhus, Denmark before moving to the U.S. to become a member of the Institute for Advanced Study in Princeton. I joined Yale in 2000.


My research interests are solar and stellar astrophysics.. My research about the Sun lies in studying the variations in the structure and dynamics of the Sun over time-scales. I study other stars sinnce I am interested in the properties of stellar materials. The study of stars other than the Sun also allows me to study the structure and evolution of the Galaxy; it also informs my study of the Sun. I specialize in studying solar and stellar properties using data on stellar oscillations. Cool stars oscilate with distinct frequencies, and those frequencies carry information about the interior structure and dynamics of the stars.  I use solar oscillation data avalable from the GONG network, as well as instruments on board SOHO and the Solar Dynamics Observatory. Sun-as-a-star oscillation data are available from the Birmingham Solar Oscillations Network (BiSON). The main source of stellar oscillation data is NASA's Kepler mission.