IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
UV habitable zones around M stars
Autor/es:
BUCCINO, A.P.; LEMARCHAND, G.A.; MAUAS, P.J.D.
Revista:
ICARUS
Editorial:
Elsevier
Referencias:
Lugar: New York; Año: 2007 vol. 192 p. 582 - 587
ISSN:
0019-1035
Resumen:
During the last decade there was a change in paradigm, which led to
consider that terrestrial-type planets within liquid-water habitable
zones (LW-HZ) around M stars can also be suitable places for the
emergence and evolution of life. Since many dMe stars emit large amount
of UV radiation during flares, in this work we analyze the UV constrains
for living systems on Earth-like planets around dM stars. We apply our
model of UV habitable zone (UV-HZ; Buccino, A.P., Lemarchand, G.A.,
Mauas, P.J.D., 2006. Icarus 183, 491 503) to the three planetary systems
around dM stars (HIP 74995, HIP 109388 and HIP 113020) observed by IUE
and to two M-flare stars (AD Leo and EV Lac). In particular, HIP 74995
hosts a terrestrial planet in the LW-HZ, which is the exoplanet that
most resembles our own Earth. We show, in general, that during the
quiescent state there would not be enough UV radiation within the LW-HZ
to trigger the biogenic processes and that this energy could be provided
by flares of moderate intensity, while strong flares do not necessarily
rule-out the possibility of life-bearing planets.