No polarized light from HD 189733 b

Go down

No polarized light from HD 189733 b

Post by Sirius_Alpha on 4th February 2009, 9:58 pm

Non-Detection of Polarized, Scattered Light from the HD 189733b Hot Jupiter

Abstract wrote:Using the POLISH instrument, I am unable to reproduce the large-amplitude polarimetric observations of Berdyugina et al. (2008) to the >99.99% confidence level. I observe no significant polarimetric variability in the HD 189733 system, and the upper limit to variability from the exoplanet is Delta_P < 7.9 x 10^(-5) with 99% confidence in the 400 nm to 675 nm wavelength range. Berdyugina et al. (2008) report polarized, scattered light from the atmosphere of the HD 189733b hot Jupiter with an amplitude of two parts in 10^4. Such a large amplitude is over an order of magnitude larger than expected given a geometric albedo similar to other hot Jupiters. However, my non-detection of polarimetric variability phase-locked to the orbital period of the exoplanet, and the lack of any significant variability, shows that the polarimetric modulation reported by Berdyugina et al. (2008) cannot be due to the exoplanet.

Caps Lock: Cruise control for 'Cool'!

Number of posts : 3605
Location : Earth
Registration date : 2008-04-06

View user profile

Back to top Go down

Back to top

Permissions in this forum:
You cannot reply to topics in this forum