scholarly journals Kepler - 411 stellar activity from the modeling of planetary transits.

2020 ◽  
Author(s):  
Alexandre Araujo ◽  
Adriana Valio
Keyword(s):  
Stellar Activity ◽  
Planetary Transits

scholarly journals Study of stellar activity through transit mapping of starspots

2010 ◽  
Vol 6 (S273) ◽  
pp. 96-103
Author(s):  
Adriana Valio
Keyword(s):  
Magnetic Field ◽  
Light Curve ◽  
Differential Rotation ◽  
Stellar Rotation ◽  
Stellar Activity ◽  
Active Star ◽  
Planetary Transits

AbstractDuring the eclipse of a planet, spots and other features on the surface of the host star may be occulted. This will cause small variations in the light curve of the star. Detailed studies of these variations during planetary transits provide a wealth of information about the starspots properties such as size, position, temperature (i.e. intensity), and magnetic field. If observation of multiple transits is available, the spots lifetime can be estimated. Moreover it may also be possible to determine the stellar rotation and whether differential rotation is present. Here, the study is performed using a method that simulates the passage of a planet (dark disk) in front of a star with multiple spots of different sizes, intensities, and positions on its surface. The data variations in the light curve of the star are fit using this method, yielding the starspots properties. Results are presented for solar-like stars, such as the active star CoRoT-2a.

scholarly journals Polarimetry of Exoplanetary System CoRoT-2

2011 ◽  
Vol 7 (S282) ◽  
pp. 209-210
Author(s):  
N. M. Kostogryz ◽  
T. M. Yakobchuk ◽  
A. P. Vidmachenko
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Stellar Activity ◽  
The Monte Carlo Method ◽  
Planetary Transits

AbstractWe present the results of modelling the polarization resulting from the planetary transits and stellar spots in the system Corot-2 using the Monte Carlo method. The planetary transit was estimated to produce a polarization maximum at the limb of ~5 × 10−6, adopting solar center-to-limb polarization. Assuming different parameters of the spots, we evaluated the flux and polarization changes due to the stellar activity.

Stellar Activity in Coeval Open Clusters: Praesepe and the Hyades

1998 ◽  
Vol 506 (1) ◽  
pp. 347-359 ◽  
Author(s):  
David Barrado y Navascués ◽  
John R. Stauffer ◽  
Sofia Randich
Keyword(s):  
Open Clusters ◽  
Stellar Activity

scholarly journals Stellar activity and magnetic shielding

2009 ◽  
Vol 5 (S264) ◽  
pp. 385-394 ◽  
Author(s):  
J.-M. Grießmeier ◽  
M. Khodachenko ◽  
H. Lammer ◽  
J. L. Grenfell ◽  
A. Stadelmann ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Direct Interaction ◽  
Planetary Atmosphere ◽  
Stellar Activity ◽  
Planetary Environment ◽  
Atmospheric Loss ◽  
Planetary Magnetic Field ◽  
Planetary Habitability

AbstractStellar activity has a particularly strong influence on planets at small orbital distances, such as close-in exoplanets. For such planets, we present two extreme cases of stellar variability, namely stellar coronal mass ejections and stellar wind, which both result in the planetary environment being variable on a timescale of billions of years. For both cases, direct interaction of the streaming plasma with the planetary atmosphere would entail servere consequences. In certain cases, however, the planetary atmosphere can be effectively shielded by a strong planetary magnetic field. The efficiency of this shielding is determined by the planetary magnetic dipole moment, which is difficult to constrain by either models or observations. We present different factors which influence the strength of the planetary magnetic dipole moment. Implications are discussed, including nonthermal atmospheric loss, atmospheric biomarkers, and planetary habitability.

scholarly journals Stellar activity, differential rotation, and exoplanets

2010 ◽  
Vol 6 (S273) ◽  
pp. 89-95 ◽  
Author(s):  
A. F. Lanza
Keyword(s):  
Time Series ◽  
Differential Rotation ◽  
Solar Irradiance ◽  
Giant Planet ◽  
Total Solar Irradiance ◽  
Short Term ◽  
Stellar Activity ◽  
Transiting Planets ◽  
Spot Model ◽  
Spot Activity

AbstractThe photospheric spot activity of some of the stars with transiting planets discovered by the CoRoT space experiment is reviewed. Their out-of-transit light modulations are fitted by a spot model previously tested with the total solar irradiance variations. This approach allows us to study the longitude distribution of the spotted area and its variations versus time during the five months of a typical CoRoT time series. The migration of the spots in longitude provides a lower limit for the surface differential rotation, while the variation of the total spotted area can be used to search for short-term cycles akin the solar Rieger cycles. The possible impact of a close-in giant planet on stellar activity is also discussed.

scholarly journals Polar stellar-spots and grazing planetary transits

2015 ◽  
Vol 583 ◽  
pp. L1 ◽  
Author(s):  
M. Oshagh ◽  
N. C. Santos ◽  
P. Figueira ◽  
V. Zh. Adibekyan ◽  
A. Santerne ◽  
...  
Keyword(s):  
Planetary Transits

scholarly journals DISENTANGLING PLANETS AND STELLAR ACTIVITY FOR GLIESE 667C

2014 ◽  
Vol 793 (2) ◽  
pp. L24 ◽  
Author(s):  
Paul Robertson ◽  
Suvrath Mahadevan
Keyword(s):  
Stellar Activity
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