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Climate variations on Earth-like circumbinary planets

View Article: PubMed Central - PubMed

ABSTRACT

The discovery of planets orbiting double stars at close distances has sparked increasing scientific interest in determining whether Earth-analogues can remain habitable in such environments and how their atmospheric dynamics is influenced by the rapidly changing insolation. In this work we present results of the first three-dimensional numerical experiments of a water-rich planet orbiting a double star. We find that the periodic forcing of the atmosphere has a noticeable impact on the planet's climate. Signatures of the forcing frequencies related to the planet's as well as to the binary's orbital periods are present in a variety of climate indicators such as temperature and precipitation, making the interpretation of potential observables challenging. However, for Earth-like greenhouse gas concentrations, the variable forcing does not change the range of insolation values allowing for habitable climates substantially.

No MeSH data available.


Related in: MedlinePlus

Amplitudes of the oscillations of zonal-mean quantities.(a) Shows the amplitude of zonal-mean TSI for OB (blue) and OP (red) as a function of latitude, (b) the amplitude of zonal-mean surface temperature, (c) the amplitude of the zonal-mean OLR and (d) the amplitude of the zonal-mean precipitation. The temporal spectrum was taken over 10,800 Earth-days in steady state. Note that the horizontal axes are scaled with the cosine of latitude.
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f4: Amplitudes of the oscillations of zonal-mean quantities.(a) Shows the amplitude of zonal-mean TSI for OB (blue) and OP (red) as a function of latitude, (b) the amplitude of zonal-mean surface temperature, (c) the amplitude of the zonal-mean OLR and (d) the amplitude of the zonal-mean precipitation. The temporal spectrum was taken over 10,800 Earth-days in steady state. Note that the horizontal axes are scaled with the cosine of latitude.

Mentions: Not only does the global-mean response to the double_periodic forcing differ for the aforementioned quantities, but also the meridional contribution of the quantities to the global-mean varies (Fig. 4). The largest amplitudes of the surface temperature are found at high latitudes, whereas in the case of the precipitation the amplitudes are largest close to the equator. The meridional distribution of surface-temperature amplitude is also different for the periods OB and OP. The contribution from low-latitudes to the global-mean amplitude of surface temperature is substantially larger for OP than for OB.


Climate variations on Earth-like circumbinary planets
Amplitudes of the oscillations of zonal-mean quantities.(a) Shows the amplitude of zonal-mean TSI for OB (blue) and OP (red) as a function of latitude, (b) the amplitude of zonal-mean surface temperature, (c) the amplitude of the zonal-mean OLR and (d) the amplitude of the zonal-mean precipitation. The temporal spectrum was taken over 10,800 Earth-days in steady state. Note that the horizontal axes are scaled with the cosine of latitude.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384241&req=5

f4: Amplitudes of the oscillations of zonal-mean quantities.(a) Shows the amplitude of zonal-mean TSI for OB (blue) and OP (red) as a function of latitude, (b) the amplitude of zonal-mean surface temperature, (c) the amplitude of the zonal-mean OLR and (d) the amplitude of the zonal-mean precipitation. The temporal spectrum was taken over 10,800 Earth-days in steady state. Note that the horizontal axes are scaled with the cosine of latitude.
Mentions: Not only does the global-mean response to the double_periodic forcing differ for the aforementioned quantities, but also the meridional contribution of the quantities to the global-mean varies (Fig. 4). The largest amplitudes of the surface temperature are found at high latitudes, whereas in the case of the precipitation the amplitudes are largest close to the equator. The meridional distribution of surface-temperature amplitude is also different for the periods OB and OP. The contribution from low-latitudes to the global-mean amplitude of surface temperature is substantially larger for OP than for OB.

View Article: PubMed Central - PubMed

ABSTRACT

The discovery of planets orbiting double stars at close distances has sparked increasing scientific interest in determining whether Earth-analogues can remain habitable in such environments and how their atmospheric dynamics is influenced by the rapidly changing insolation. In this work we present results of the first three-dimensional numerical experiments of a water-rich planet orbiting a double star. We find that the periodic forcing of the atmosphere has a noticeable impact on the planet's climate. Signatures of the forcing frequencies related to the planet's as well as to the binary's orbital periods are present in a variety of climate indicators such as temperature and precipitation, making the interpretation of potential observables challenging. However, for Earth-like greenhouse gas concentrations, the variable forcing does not change the range of insolation values allowing for habitable climates substantially.

No MeSH data available.


Related in: MedlinePlus