نتایج جستجو برای: kepler
تعداد نتایج: 3116 فیلتر نتایج به سال:
To date, only 18 exoplanets with radial velocity (RV) semi-amplitudes $<2$ m/s have had their masses directly constrained. The biggest obstacle to RV detection of such is variability intrinsic stars themselves, e.g. nuisance signals arising from surface magnetic activity as rotating spots and plages, which can drown out or even mimic planetary signals. We use Kepler-37 - known host three transi...
The MEarth Project is a ground-based photometric survey intended to find planets transiting the closest and smallest main-sequence stars. In its first four years, MEarth discovered one transiting exoplanet, the 2.7R⊕ planet GJ1214b. Here, we answer an outstanding question: in light of the bounty of small planets transiting small stars uncovered by the Kepler mission, should MEarth have found mo...
Context. The Kepler space mission led to a large number of high-precision time series of solar-like oscillators. Using a Bayesian analysis that combines asteroseismic techniques and additional ground-based observations, the mass, radius, luminosity, and distance of these stars can be estimated with good precision. This has given a new impetus to the research field of galactic archeology. Aims. ...
The nearly circular (mean eccentricity [Formula: see text]) and coplanar (mean mutual inclination [Formula: see text]) orbits of the solar system planets motivated Kant and Laplace to hypothesize that planets are formed in disks, which has developed into the widely accepted theory of planet formation. The first several hundred extrasolar planets (mostly Jovian) discovered using the radial veloc...
We perform a homogeneous search for and analysis of optical occultations phase variations the most favorable ultra-short-period (USP) ($P<1$~d) sub-Neptunes ($R_{p}<4 R_{\oplus}$) observed by $\textit{Kepler}$ K2, with aim better understanding their nature. first selected 16 K2 USP sub-Neptunes, based on expected occultation signal. filtered out stellar variability in light curves, using slidin...
We have searched the Kepler light curves of ∼ 3900 M-star targets for evidence of periodicities that indicate, by means of the effects of starspots, rapid stellar rotation. Several analysis techniques, including Fourier transforms, inspection of folded light curves, ‘sonograms’, and phase tracking of individual modulation cycles, were applied in order to distinguish the periodicities due to rap...
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