1,810 research outputs found
Using Satellites to Probe Extrasolar Planet Formation
Planetary satellites are an integral part of the heirarchy of planetary
systems. Here we make two predictions concerning their formation. First,
primordial satellites, which have an array of distinguishing characteristics,
form only around giant planets. If true, the size and duration of a planetary
system's protostellar nebula, as well as the location of its snow line, can be
constrained by knowing which of its planets possess primordial satellites and
which do not. Second, all satellites around terrestrial planets form by
impacts. If true, this greatly enhances the constraints that can be placed on
the history of terrestrial planets by their satellites' compositions, sizes,
and dynamics
LASR-Guided Stellar Photometric Variability Subtraction: The Linear Algorithm For Significance Reduction
We develop a technique for removing stellar variability in the light curves
of -Scuti and similar stars. Our technique, which we name the Linear
Algorithm for Significance Reduction (LASR), subtracts oscillations from a time
series by minimizing their statistical significance in frequency space. We
demonstrate that LASR can subtract variable signals of near-arbitrary
complexity and can robustly handle close frequency pairs and overtone
frequencies. We demonstrate that our algorithm performs an equivalent fit as
prewhitening to the straightforward variable signal of KIC 9700322. We also
show that LASR provides a better fit to seismic activity than prewhitening in
the case of the complex -Scuti KOI-976.Comment: 9 pages, 5 figures, accepted for publication in Astronomy &
Astrophysics. Pseudocode and github link to code included in manuscrip
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