NDLI: Removing activity-related radial velocity noise to improve extrasolar planet searches

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Removing activity-related radial velocity noise to improve extrasolar planet searches

Content Provider	NASA Technical Reports Server (NTRS)
Author	Saar, Steven Lindstrom, David M. Technical Monitor
Copyright Year	2004
Description	We have made significant progress towards the proposal goals of understanding the causes and effects of magnetic activity-induced radial velocity (v_r) jitter and developing methods for correcting it. In the process, we have also made some significant discoveries in the fields of planet-induced stellar activity, planet detection methods, M dwarf convection, starspot properties, and magnetic dynamo cycles. We have obtained super high resolution (R approximately 200,000), high S / N (greater than 300) echelle study of joint line bisector and radial velocity variations using the McDonald 2-D coude. A long observing run in October 2002 in particular was quite successful (8 clear nights). We now have close to three years of data, which begins to sample a good fraction of the magnetic cycle timescales for some of our targets (e.g., kappa Ceti; P_cyc = 5.6 yrs). This will be very helpful in unraveling the complex relationships between plage and radial velocity (v-r) changes which we have uncovered. Preliminary analysis (Saar et al. 2003) of the data in hand, reveals correlations between median line bisector displacement and v_r. The correlation appears to be specific the the particular star being considered, probably since it is a function of both spectral type and rotation rate. Further analysis and interpretation will be in the context of evolving plage models and is in progress.
File Size	319871
Page Count	5
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040086551
Archival Resource Key	ark:/13960/t5n926q4r
Language	English
Publisher Date	2004-08-01
Access Restriction	Open
Subject Keyword	Astrophysics High Resolution Vibration Planet Detection Extrasolar Planets Magnetic Variations G Stars Starspots Acoustics Radial Velocity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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