Natural masers and lasers and bioastronomy

Details Natural masers and lasers and bioastronomy Natural masers and lasers and bioastronomy

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997abos.conf..381s&link_type=abstract

Conference Paper, Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium 161, Publisher: B

Astronomy and Astrophysics

Astronomy

1

Extrasolar Planets, Protoplanets, Exobiology, Interstellar Masers, Stellar Envelopes, Hydrogen Recombinations, H Lines, Planetary Evolution, Molecular Spectra, Radio Astronomy, Project Seti

Scientific paper

We discuss three possible applications of natural masers and lasers of interest to bioastronomy: the study of protoplanetary circumstellar disks; the study of extrasolar planets; and interstellar communications. Masers and lasers in hydrogen recombination lines are observed from the circumstellar disk of a massive star, MWC349 A, and serve as probes of the disk's kinematics and structure. They give, in particular, some indications for a void in the central (R = 40 AU) part of the disk, which may be caused by a forming planetary system. We demonstrate that masers (but not lasers) in molecular lines from the atmospheres of the recently discovered extrasolar planets on close orbits around their suns (51 Peg, Tau Boo) can be detectable with the existing ground-based radioastronomical facilities. The importance of such a detection solicits a deeper analysis of general properties of the planetary masing and lasing and an analysis of the candidate lines to be searched. We argue against the use of natural lasers for SETI.

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