Exoplanet Community Report

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Exoplanet Community Report

Post by Sirius_Alpha on 13th July 2008, 6:14 pm

Some interesting stuff from a draft of the "Exoplanet Community Report".
http://exep.jpl.nasa.gov/documents/Forum2008_010_pub.pdf

The paper wrote:Single-telescope ground-based astrometry has had success in discovering stellar and brown dwarf companions and measuring their dynamical masses (e.g. Pravdo et al. 2004, Pravdo, Shaklan, Lloyd 2005, Pravdo et al. 2006), but no exoplanet has been astronomically discovered yet. The reasons for this are simple: lack of support for observing time and lack of funding for instruments.
So... it looks like the possible astrometric detection of a hypothetical LHS 288 b either turned out to be false, or the paper doesn't take it into account.

But finding planets via astrometry may not be too hard.
The paper wrote:A modest fraction, e.g. 10% of the time currently granted to radial-velocity (RV) observations would result in the first astrometric discoveries of exoplanets.

The paper goes on to say
The paper wrote:Dynamical mass measurements could be made of >50 of the currently known exoplanets with ambiguous mass measurements (due to unknown inclination angles) with a new ground-based system featuring a detector with high dynamic range. Such an instrument could use current technology either in the visible or infrared.

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Re: Exoplanet Community Report

Post by Lazarus on 13th July 2008, 7:05 pm

Sirius_Alpha wrote:So... it looks like the possible astrometric detection of a hypothetical LHS 288 b either turned out to be false, or the paper doesn't take it into account.
...assuming the star in question was LHS 288 in the first place...
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Re: Exoplanet Community Report

Post by Sirius_Alpha on 13th July 2008, 7:14 pm

Lazarus wrote:...assuming the star in question was LHS 288 in the first place...
Yes, of course.

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Re: Exoplanet Community Report

Post by Sirius_Alpha on 14th July 2008, 11:37 pm

Astrometric Detection of exo-Earths in the Presence of Stellar Noise
http://arxiv.org/abs/0807.1930

Abstract wrote:Space astrometry is capable of sub-microarcsecond measurements of star positions. A hundred visits over several years could yield relative astrometric precision of ~0.1 uas, below the astrometric signature (0.3 uas) of a Sun-Earth system at a distance of 10 parsecs. We investigate the impact of starspots on the detectability, via astrometric and radial velocity techniques, of Earthlike planets orbiting Sunlike stars. We find that for nearby stars, although starspot noise imposes severe restrictions on detectability by the radial velocity technique, it does not significantly affect astrometric detectability of habitable zone planets down to below an Earth mass.

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