Polarization and SEDs from Microlensing of Circumstellar Envelopes

Details Polarization and SEDs from Microlensing of Circumstellar Envelopes Polarization and SEDs from Microlensing of Circumstellar Envelopes

2008-04-14

arxiv.org/abs/0804.2176v1

PoS GMC8:027,2007

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of The Manchester Microlensing Conference: The 12th International Conference and ANGLES Microlens

Scientific paper

Microlensing surveys have proven to be tremendously fruitful in providing valuable data products for many fields of astrophysics, from eclipse lightcurves for substellar candidates to limb darkening in stellar atmospheres. We report on a program of modeling observables from microlensing of circumstellar envelopes, particularly those of red giant stars that are the most likely to show finite source effects. We will summarize work for how polarization light curves can be used to infer envelope properties and will describe recent modeling of the time dependent spectral energy distributions (SEDs) for microlensing of dusty winds. One of the most exciting developments is the possibility of measuring variable polarization from microlensing in a suitable source using the RINGO polarimeter at La Palma. Also quite interesting is the possibility of probing a dusty wind using IRAC data for a suitable source in the event that Spitzer has a ``warm'' cycle.

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