SIMBAD references

2014ApJ...795...12W - Astrophys. J., 795, 12 (2014/November-1)

Toward the detection of exoplanet transits with polarimetry.

WIKTOROWICZ S.J. and LAUGHLIN G.P.

Abstract (from CDS):

In contrast to photometric transits, whose peak signal occurs at mid-transit due to occultation of the brightest region of the disk, polarimetric transits provide a signal upon ingress and egress due to occultation of the polarized stellar limb. Limb polarization, the bright corollary to limb darkening, arises from the 90° scattering angle and low optical depth experienced by photons at the limb. In addition to the ratio Rp/R*, the amplitude of a polarimetric transit is expected to be controlled by the strength and width of the stellar limb polarization profile, which depend on the scattering-to-total opacity ratio at the stellar limb. We present a short list of the systems providing the highest expected signal-to-noise ratio for detection of this effect, and we draw particular attention to HD 80606b. This planet is spin/orbit misaligned, has a three-hour ingress, and has a bright parent star, which make it an attractive target. We report on test observations of an HD 80606b ingress with the POLISH2 polarimeter at the Lick Observatory Shane 3 m telescope. We conclude that unmodeled telescope systematic effects prevented polarimetric detection of this event. We outline a roadmap for further refinements of exoplanet polarimetry, whose eventual success will require a further factor of ten reduction in systematic noise.

Abstract Copyright:

Journal keyword(s): planets and satellites: general - planets and satellites: individual: HD 80606b - polarization - stars: atmospheres - stars: individual: HD 80606 - techniques: polarimetric

Simbad objects: 18

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2020.01.22-13:18:25

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