Multiplanet system imaged at HR 8799

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Re: Multiplanet system imaged at HR 8799

Post by Led_Zep on 10th February 2016, 3:22 pm

http://arxiv.org/abs/1602.02856

High-Cadence, High-Contrast Imaging for Exoplanet Mapping: Observations of the HR 8799 Planets with VLT/SPHERE Satellite Spot-Corrected Relative Photometry


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Re: Multiplanet system imaged at HR 8799

Post by Lazarus on 17th March 2016, 7:43 pm

Booth et al. (2016) "Resolving the Planetesimal Belt of HR 8799 with ALMA"
http://arxiv.org/abs/1603.04853

Some tension between the derived location of the inner edge of the disc and the orbit of the outermost planet HR 8799 b. This could be resolved if the orbit of HR 8799 b reaches eccentricities of 0.3 (e.g. due to perturbations from the other planets), or if there is an additional planet located between HR 8799 b and the inner edge of the disc.
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Re: Multiplanet system imaged at HR 8799

Post by Sirius_Alpha on 27th April 2016, 8:38 pm

Astrometric Monitoring of the HR 8799 Planets: Orbit Constraints from Self-Consistent Measurements
http://arxiv.org/abs/1604.08157

More monitoring of their positions and orbits. They tentatively suggest that the planets may have higher inclinations than reported before, which might make it more consistent with the inclination of the disk from ALMA observations, as well as from asteroseismology results for the stellar inclination.

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Re: Multiplanet system imaged at HR 8799

Post by Lazarus on 18th October 2016, 5:41 pm

Another orbit analysis, this time allowing for both eccentric and misaligned orbits. Seems to be a 2-sigma case for a misalignment between b and c, and planet d appears to have a non-zero eccentricity.

Wertz et al. "VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit"
https://arxiv.org/abs/1610.04014
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Re: Multiplanet system imaged at HR 8799

Post by Led_Zep on 10th November 2016, 9:31 pm

http://subarutelescope.org/Topics/2016/11/09/index.html

First light of CHARIS (Coronagraphic High Angular Resolution Imaging Spectrograph),
a new instrument for the Subaru Telescope



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