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Activity Number: 154 - Statistical and Imaging Methods in Astronomy and Astrophysics
Type: Topic Contributed
Date/Time: Monday, July 31, 2017 : 10:30 AM to 12:20 PM
Sponsor: Astrostatistics Special Interest Group
Abstract #322961
Title: Disentangling Stellar Spectra
Author(s): Jessi Cisewski* and Allen Davis and Debra Fischer and Eric Ford and Xavier Dumusque
Companies: Yale University and Yale and Yale and Penn State and Université de Genève
Keywords: Astrostatistics ; Exoplanets ; Signal separation

The Radial Velocity (RV) Method for uncovering exoplanets relies on the detection of subtle shifts in the stellar spectra due to the Doppler effect caused by an orbiting object. The Earth's pull on the Sun results in radial velocity (RV) of about 10 cm/sec. To measure RV's at this level -- when stars of interest are light years away -- requires extraordinary engineering and design beyond the most powerful spectrographs currently in existence. And astronomers are currently building spectrographs that may be capable of achieving this precision. However, stellar activity can cause distortions in the spectra that mimic the RV of an orbiting exoplanet. I will discuss some statistical methods that can be used for characterizing the sources of variability in the spectra.

Authors who are presenting talks have a * after their name.

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