987 research outputs found
On the Inclination and Habitability of the HD 10180 System
There are numerous multi-planet systems that have now been detected via a
variety of techniques. These systems exhibit a range of both planetary
properties and orbital configurations. For those systems without detected
planetary transits, a significant unknown factor is the orbital inclination.
This produces an uncertainty in the mass of the planets and their related
properties, such as atmospheric scale height. Here we investigate the HD~10180
system which was discovered using the radial velocity technique. We provide a
new orbital solution for the system which allows for eccentric orbits for all
planets. We show how the inclination of the system affects the mass/radius
properties of the planets and how the detection of phase signatures may resolve
the inclination ambiguity. We finally evaluate the Habitable Zone properties of
the system and show that the g planet spends 100\% of an eccentric orbit within
the Habitable Zone.Comment: 7 pages, 6 figures, 2 tables, accepted for publication in the
Astrophysical Journa
Phase Curves of the Kepler-11 Multi-Planet System
The Kepler mission has allowed the detection of numerous multi-planet
exosystems where the planetary orbits are relatively compact. The first such
system detected was Kepler-11 which has six known planets at the present time.
These kinds of systems offer unique opportunities to study constraints on
planetary albedos by taking advantage of both the precision timing and
photometry provided by Kepler data to monitor possible phase variations. Here
we present a case study of the Kepler-11 system in which we investigate the
phase modulation of the system as the planets orbit the host star. We provide
predictions of maximum phase modulation where the planets are simultaneously
close to superior conjunction. We use corrected Kepler data for Q1-Q17 to
determine the significance of these phase peaks. We find that data quarters
where maximum phase peaks occur are better fit by a phase model than a "null
hypothesis" model.Comment: 9 pages, 4 figures, 2 tables, accepted for publication in Ap
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