XO-4 b and XO-5 b announced.

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XO-4 b and XO-5 b announced.

Post by Sirius_Alpha on 20th May 2008, 7:08 pm

Two new XO planets,

XO-4 b http://fr.arxiv.org/abs/0805.2921
XO-5 b http://fr.arxiv.org/abs/0805.2399

They're the usual standard hot Jupiter kind of planet, here's the statistics:

Star[br] XO-4 XO-5
Distance (ly) 950 880
Spectral F5V G8V
Mass (x Sol) 1.32 1.0
Visual Mag 11 12.1
[Fe/H] -0.04 0.25
Temp K 6397 5510
Radius 1.56 1.11
Age (Gyr) 2.1 8.5
Planet XO-4 b XO-5 b
Mass (x Jupiter) 1.72 1.15
Period (days) 4.12502 4.187732
Semi-major axis (AU) 0.0555 0.0508
eccentricity 0 0?
inclination 88.7 86.8
radius (x Jupiter) 1.34 1.15
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Re: XO-4 b and XO-5 b announced.

Post by Edasich on 16th June 2008, 6:24 am

XO-5 is fairly old. Close to evolve off the main sequence Smile
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Re: XO-4 b and XO-5 b announced.

Post by Lazarus on 1st October 2008, 8:12 pm

HATNet has observed XO-5b (they discovered it independently but got scooped) and have released a paper which gives refined parameters based on the combined XO+HATNet dataset.
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Re: XO-4 b and XO-5 b announced.

Post by Sirius_Alpha on 1st October 2008, 8:39 pm

I find it interesting that all of these transiting planet scoops are going on. One of the 1SWASP candidates a while back was an XO planet, and there's this recent HAT-P-10/WASP-11 thing, and now HATnet/XO-5b.

Transiting planets may be rarer than I figured, or at least around the visual magnitudes typically searched.

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Re: XO-4 b and XO-5 b announced.

Post by Lazarus on 2nd October 2008, 7:18 am

Actually the independent observation of the planet is a good thing: it means we can regard the planet as "independently confirmed", which makes it far less likely it is some artifact of data reduction. I wonder if XO-5b would have been the mysteriously-missing HAT-P-8b...

One of the things that may cause problems with extending the sample of transiting planets is that there appears to be a "planet desert" at intermediate periods. Since transit probability goes down as orbital period increases, this may significantly slow down the rate.
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Re: XO-4 b and XO-5 b announced.

Post by Sirius_Alpha on 2nd October 2008, 7:04 pm

Lazarus wrote:Actually the independent observation of the planet is a good thing: it
means we can regard the planet as "independently confirmed", which
makes it far less likely it is some artifact of data reduction.
Oh yes, indeed. I meant not to suggest that this was so much a bad thing.

Lazarus wrote:I wonder if XO-5b would have been the mysteriously-missing HAT-P-8b...
My thoughts exactly.

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Re: XO-4 b and XO-5 b announced.

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