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Spectral line enhancements as signatures for stellar activity: AD Leonis – an example

Published online by Cambridge University Press:  19 August 2010

M. Leitzinger ,
P. Odert ,
A. Hanslmeier ,
I. Ribas ,
A.A. Konovalenko ,
M. Vanko ,
H. Lammer ,
M.L. Khodachenko  and
H.O. Rucker
M. Leitzinger*
Affiliation:
Institute of Physics/IGAM, University of Graz, Austria
P. Odert
Affiliation:
Institute of Physics/IGAM, University of Graz, Austria
A. Hanslmeier
Affiliation:
Institute of Physics/IGAM, University of Graz, Austria
I. Ribas
Affiliation:
Institut d'Estudis de Espacials de Catalunya, Barcelona, Spain
A.A. Konovalenko
Affiliation:
Institute of Radio Astronomy, Ukrainian Academy of Sciences, Kharkov, Ukraine
M. Vanko
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, Slovakia
H. Lammer
Affiliation:
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
M.L. Khodachenko
Affiliation:
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
H.O. Rucker
Affiliation:
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
*
e-mail: [email protected]
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Abstract

A high level of stellar activity in the form of frequent flaring and frequent mass ejections can lead to the total loss of exoplanetary atmospheres due to evaporation and erosion. Simulations have shown such scenarii for close-in exoplanets orbiting M-stars. Information on stellar flaring activity is accessible more easily than information on stellar mass ejections, simply due to the difference in detection. In the National Aeronautics and Space Administration/Far Ultraviolet Spectroscopic Explorer spectra of the dM star AD Leonis we find an interesting event lasting for only one spectrum. The first component of the OVI (103.19 nm, 103.76 nm) duplet shows an enhancement of the blue wing, shifted by about 90 km s−1. This event occurred one spectrum after a flare. We discuss several solar/stellar phenomena that might produce such a spectral feature and could therefore explain this event.

Keywords

Stellar activitylate-type starsplanet-star interactions
Type
Research Article
Information
International Journal of Astrobiology , Volume 9 , Special Issue 4: Special issue Papers from the Astrobiology Society of Britain Conference 2010 , October 2010 , pp. 235 - 238
Copyright
Copyright © Cambridge University Press 2010

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