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A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project
Paul J. Green, T. L. Aldcroft, G. T. Richards +13
We study the spectral energy distributions and evolution of a large sample of optically selected quasars from the Sloan Digital Sky Survey (SDSS) that were observed in 323 Chandra…
Extrasolar Giant Planets and X-ray Activity
Vinay L. Kashyap, Jeremy J. Drake, Steven H. Saar
We have carried out a survey of X-ray emission from stars with giant planets, combining both archival and targeted surveys. Over 230 stars have been currently identified as possess…
X-Atlas: An Online Archive of Chandra's Stellar High Energy Transmission Gratings Observations
Owen W. Westbrook, Nancy Remage Evans, Scott J. Wolk +6
The high-resolution X-ray spectroscopy made possible by the 1999 deployment of the Chandra X-ray Observatory has revolutionized our understanding of stellar X-ray emission. Many pu…
First Observation of Planet-Induced X-ray Emission: The System HD 179949
S. H. Saar, M. Cuntz, V. L. Kashyap +1
We present the first observation of planet-induced stellar X-ray activity, identified for the HD 179949 system, using Chandra / ACIS-S. The HD 179949 system consists of a close-in…
Short Timescale Coronal Variability in Capella
Vinay L. Kashyap, Jennifer Posson-Brown
We analyze 205 ks of imaging data of the active binary, Capella, obtained with the Chandra High Resolution Camera Imager (HRC-I) to determine whether Capella shows any variability…
Bayesian Estimation of Hardness Ratios: Modeling and Computations
Taeyoung Park, Vinay L. Kashyap, Aneta Siemiginowska +4
A commonly used measure to summarize the nature of a photon spectrum is the so-called Hardness Ratio, which compares the number of counts observed in different passbands. The hardn…