Mathematics – Probability
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.0403c&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #04.03; Bulletin of the American Astronomical Society, Vol. 26, p.862
Mathematics
Probability
Scientific paper
The collision of a comet-like object with a Jupiter- sized planet orbiting another star may be detectable as a brief increase in the magnitude of the stellar-planet system. The expected increase in magnitude is calculated assuming the star radiates as a blackbody, and the collision event also radiates as a blackbody within an area of radius R on the planet's surface. For a particular R and collision event luminosity, we estimate the collision temperature. Using this temperature we then calculate the blackbody emission at a particular wavelength. Adding this emission to the stellar emission at that wavelength gives the increase in flux, or magnitude. For the local comet-Jupiter collision event we find that a distant observer (say, 10 parsecs) would not detect the occurrence of the comet collision, at any wavelength. The change in magnitude is much less than a millimagnitude at wavelengths from the UV through the FIR. However, when we consider a cool star (3,000 K), and a range of possible collision luminosities and areas of blackbody emission, we find a range of observable magnitude increases, predominantly in the UV. For example, for a collision luminosity only ten times that of the local event (about 10(25) ergs/sec), and blackbody emission over an area of radius 10(-4) Jupiter radii, we find a magnitude increase of 2, seen at 1500 Angstroms. We will present the magnitude changes expected for a range of luminosities, wavelengths, and areas of emission. Also, we will discuss the probability of ever seeing such an event occuring in another stellar system.
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