SIMBAD references

2019ApJ...872...17R - Astrophys. J., 872, 17-17 (2019/February-2)

HAZMAT. V. The ultraviolet and X-ray evolution of K stars.

RICHEY-YOWELL T., SHKOLNIK E.L., SCHNEIDER A.C., OSBY E., BARMAN T. and MEADOWS V.S.

Abstract (from CDS):

Knowing the high-energy radiation environment of a star over a planet's formation and evolutionary period is critical in determining if that planet is potentially habitable and if any biosignatures could be detected, as UV radiation can severely change or destroy a planet's atmosphere. Current efforts for finding a potentially habitable planet are focused on M stars, yet K stars may offer more habitable conditions due to decreased stellar activity and more distant and wider habitable zones (HZs). While M star activity evolution has been observed photometrically and spectroscopically, there has been no dedicated investigation of K star UV evolution. We present the first comprehensive study of the near-UV, far-UV, and X-ray evolution of K stars. We used members of young moving groups and clusters ranging in age from 10 to 625 Myr combined with field stars and their archived GALEX UV and ROSAT X-ray data to determine how the UV and X-ray radiation evolve. We find that the UV and X-ray flux incident on an HZ planet is 5-50 times lower than that of HZ planets around early-M stars and 50-1000 times lower than those around late-M stars, due to both an intrinsic decrease in K dwarf stellar activity occurring earlier than for M dwarfs and the more distant location of the K dwarf HZ.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: evolution - stars: low-mass

Status in Simbad:  waiting for electronic table

Simbad objects: 10

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2019.12.06-04:07:46

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