Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-10-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted by A&A; 2 additional figures, extended discussion
Scientific paper
Close-in, giant planets are expected to influence their host stars via tidal or magnetic interaction. But are these effects strong enough in suitable targets known so far to be observed with today's instrumentation? The upsilon And system, an F8V star with a Hot Jupiter, was claimed to undergo cyclic changes in chromospheric activity indicators with its innermost planet's period. We want to investigate the stellar chromospheric and coronal activity over several months. We therefore monitored the star in X-rays as well as at optical wavelengths to test coronal and chromospheric activity indicators for planet-induced variability, making use of the Chandra X-ray Observatory as well as the echelle spectrographs FOCES and HRS at Calar Alto (Spain) and the Hobby-Eberly Telescope (Texas, US). The stellar activity level is low, as seen both in X-rays as in Ca II line fluxes; the chromospheric data show variability with the stellar rotation period. We do not find activity variations in X-rays or in the optical which can be traced back to the planet. Gaining observational evidence for star-planet interactions in X-rays remains challenging.
Lenz L. F.
Poppenhaeger Katja
Reiners Ansgar
Schmitt Juergen H. M. M.
Shkolnik Evgenya
No associations
LandOfFree
A search for star-planet interactions in the upsilon Andromedae system at X-ray and optical wavelengths does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A search for star-planet interactions in the upsilon Andromedae system at X-ray and optical wavelengths, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A search for star-planet interactions in the upsilon Andromedae system at X-ray and optical wavelengths will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-485353