scholarly journals Impact flux of asteroids and water transport to the habitable zone in binary star systems

2014 ◽  
Vol 9 (S310) ◽  
pp. 86-87
Author(s):  
D. Bancelin ◽  
E. Pilat-Lohinger ◽  
S. Eggl ◽  
R. Dvorak
Keyword(s):  
Binary Star ◽  
Stellar System ◽  
Terrestrial Planet ◽  
Solar Neighborhood ◽  
Planetary Motion ◽  
Habitable Zone ◽  
Star System ◽  
Single Star ◽  
Multiple Systems ◽  
Binary Star System

AbstractBy now, observations of exoplanets have found more than 50 binary star systems hosting 71 planets. We expect these numbers to increase as more than 70% of the main sequence stars in the solar neighborhood are members of binary or multiple systems. The planetary motion in such systems depends strongly on both the parameters of the stellar system (stellar separation and eccentricity) and the architecture of the planetary system (number of planets and their orbital behaviour). In case a terrestrial planet moves in the so-called habitable zone (HZ) of its host star, the habitability of this planet depends on many parameters. A crucial factor is certainly the amount of water. We investigate in this work the transport of water from beyond the snow-line to the HZ in a binary star system and compare it to a single star system.

scholarly journals A terrestrial planet in a ~1-AU orbit around one member of a ∼15-AU binary

Science ◽  
2014 ◽  
Vol 345 (6192) ◽  
pp. 46-49 ◽  
Author(s):  
A. Gould ◽  
A. Udalski ◽  
I.-G. Shin ◽  
I. Porritt ◽  
J. Skowron ◽  
...  
Keyword(s):  
Binary Systems ◽  
Planet Formation ◽  
Binary Star ◽  
Terrestrial Planet ◽  
Search Strategies ◽  
The Sun ◽  
Star System ◽  
Low Mass ◽  
Formation And Evolution ◽  
Binary Star System

Using gravitational microlensing, we detected a cold terrestrial planet orbiting one member of a binary star system. The planet has low mass (twice Earth’s) and lies projected at ~0.8 astronomical units (AU) from its host star, about the distance between Earth and the Sun. However, the planet’s temperature is much lower, <60 Kelvin, because the host star is only 0.10 to 0.15 solar masses and therefore more than 400 times less luminous than the Sun. The host itself orbits a slightly more massive companion with projected separation of 10 to 15 AU. This detection is consistent with such systems being very common. Straightforward modification of current microlensing search strategies could increase sensitivity to planets in binary systems. With more detections, such binary-star planetary systems could constrain models of planet formation and evolution.

scholarly journals An Important Binary Star System

Nature ◽  
1942 ◽  
Vol 150 (3810) ◽  
pp. 545-545
Keyword(s):  
Binary Star ◽  
Star System ◽  
Binary Star System

scholarly journals Surface flux patterns on planets in circumbinary systems and potential for photosynthesis

2014 ◽  
Vol 14 (3) ◽  
pp. 465-478 ◽  
Author(s):  
Duncan H. Forgan ◽  
Alexander Mead ◽  
Charles S. Cockell ◽  
John A. Raven
Keyword(s):  
Binary Star ◽  
Surface Flux ◽  
Close Binary ◽  
Mass Motion ◽  
Single Star ◽  
Photosynthetic Organisms ◽  
Spatial And Temporal Distributions ◽  
Close Binary Star ◽  
Binary Star System ◽  
Circumbinary Planets

AbstractRecently, the Kepler Space Telescope has detected several planets in orbit around a close binary star system. These so-called circumbinary planets will experience non-trivial spatial and temporal distributions of radiative flux on their surfaces, with features not seen in their single-star orbiting counterparts. Earth-like circumbinary planets inhabited by photosynthetic organisms will be forced to adapt to these unusual flux patterns. We map the flux received by putative Earth-like planets (as a function of surface latitude/longitude and time) orbiting the binary star systems Kepler-16 and Kepler-47, two star systems which already boast circumbinary exoplanet detections. The longitudinal and latitudinal distribution of flux is sensitive to the centre-of-mass motion of the binary, and the relative orbital phases of the binary and planet. Total eclipses of the secondary by the primary, as well as partial eclipses of the primary by the secondary add an extra forcing term to the system. We also find that the patterns of darkness on the surface are equally unique. Beyond the planet's polar circles, the surface spends a significantly longer time in darkness than latitudes around the equator, due to the stars’ motions delaying the first sunrise of spring (or hastening the last sunset of autumn). In the case of Kepler-47, we also find a weak longitudinal dependence for darkness, but this effect tends to average out if considered over many orbits. In the light of these flux and darkness patterns, we consider and discuss the prospects and challenges for photosynthetic organisms, using terrestrial analogues as a guide.

scholarly journals KOI-3278: A Self-Lensing Binary Star System

Science ◽  
2014 ◽  
Vol 344 (6181) ◽  
pp. 275-277 ◽  
Author(s):  
E. Kruse ◽  
E. Agol
Keyword(s):  
Binary Star ◽  
Star System ◽  
Binary Star System

scholarly journals The first magnetic maps of a pre-main-sequence binary star system – HD 155555

2008 ◽  
Vol 387 (2) ◽  
pp. 481-496 ◽  
Author(s):  
N. J. Dunstone ◽  
G. A. J. Hussain ◽  
A. Collier Cameron ◽  
S. C. Marsden ◽  
M. Jardine ◽  
...  
Keyword(s):  
Main Sequence ◽  
Binary Star ◽  
Star System ◽  
Binary Star System
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