منابع مشابه
Starspots and Spin-orbit Alignment in the Wasp-4 Exoplanetary System
We present photometry of 4 transits of the exoplanet WASP-4b, each with a precision of approximately 500 ppm and a time sampling of 40-60 s. We have used the data to refine the estimates of the system parameters and ephemerides. During two of the transits we observed a short-lived, low-amplitude anomaly that we interpret as the occultation of a starspot by the planet. We also found evidence for...
متن کاملStarspots and Exoplanets
The discovery of exoplanets has resulted from a significant increase in the precision of stellar radial velocity measurements. In the past decade this precision has improved from several hundreds of m s 1 to a few m s 1. In the near future astrometric measurements will make a similar increase in their precision by factors of several hundred. Although discovering exoplanets is driving the need f...
متن کاملMeasuring starspots on magnetically active stars with the VLTI
We present feasibility studies to directly image stellar surface features, which are caused by magnetic activity, with the Very Large Telescope Interferometer (VLTI). We concentrate on late type magnetically active stars, for which the distribution of starspots on the surface has been inferred from photometric and spectroscopic imaging analysis. The study of the surface spot evolution during co...
متن کاملMagnetic activity on AB Doradus: Temporal evolution of starspots
Surface brightness maps for the young K0 dwarf AB Doradus are reconstructed from archival data sets for epochs spanning 1988 to 1994. By using the signal-to-noise enhancement technique of Least-Squares Deconvolution, our results show a greatly increased resolution of spot features than obtained in previously published surface brightness reconstructions. These images show that for the exception ...
متن کاملThe effect of starspots on eclipse timings of binary stars
We investigate the effects that starspots have on the light curves of eclipsing binaries and in particular how they may affect the accurate measurement of eclipse timings. Concentrating on systems containing a low-mass main-sequence star and a white dwarf, we find that if starspots exhibit the Wilson depression they can alter the times of primary eclipse ingress and egress by several seconds fo...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2016
ISSN: 1538-3881
DOI: 10.3847/0004-6256/151/6/150