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K2-25
Red dwarf star located in the Hyades cluster From Wikipedia, the free encyclopedia
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K2-25 is a young red dwarf star located in the Hyades cluster. There is a single known Neptune-sized planet in a 3.5 day orbit.
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Hyades cluster
Using proper motion measurements in a search for low-luminosity members of the Hyades cluster, William van Altena first identified the star vA 50 (later known as K2-25) as a probable cluster member.[12] Membership in the Hyades cluster was later confirmed.[13][14][4]
Properties
K2-25 is a red dwarf that is only 26% the mass of the Sun and less than 1% of the luminosity.[6] As a member of the Hyades cluster, it is only 650 million years old as compared to the Sun's 4.5 billion.[8]
There is clear evidence for starspot activity in both the Kepler data and radial velocities as well as the associated activity indicators.[15]
Planetary system
The star has one known planet, K2-25b, with searches of the Kepler space telescope data for transits of additional planets being negative.[4] Analysis of transit-timing variations from the Spitzer Space Telescope as well as the MEarth Project also found no evidence of additional planets.[16]
Discovery
Brightness measurements of K2-25 taken by the Kepler space telescope during its extended K2 mission led to the discovery of the transiting planet K2-25b.[4][10]
Characteristics
K2-25b is a Hot Neptune type planet in an eccentric 3.48 day orbit.[15]
Due to its proximity and the activity levels of its host star, K2-25b should be losing some of its atmosphere to space; however, observations of two transits by the Hubble Space Telescope to search for escaping neutral hydrogen were negative.[17]
Gallery
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References
External links
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