Short-period super-Earth at GJ 3634

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Short-period super-Earth at GJ 3634

Post by Lazarus on 5th February 2011, 3:05 pm

From the A&A Forthcoming list:

X. Bonfils, M. Gillon, T. Forveille, X. Delfosse, D. Deming, B.-O. Demory, C. Lovis, M. Mayor, V. Neves, C. Perrier, N. C. Santos, S. Seager, S. Udry, I. Boisse, M. Bonnefoy, "A short-period super-Earth orbiting the M2.5 dwarf GJ 3634. Detection with Harps velocimetry and transit search with Spitzer photometry"
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Re: Short-period super-Earth at GJ 3634

Post by tommi59 on 5th February 2011, 4:55 pm

Do you have any details?? transit??where can I find more info
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Re: Short-period super-Earth at GJ 3634

Post by Sirius_Alpha on 5th February 2011, 5:03 pm

I get the idea that if it transited, it would say so in the title instead of just "transit search."

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Re: Short-period super-Earth at GJ 3634

Post by Lazarus on 5th February 2011, 5:44 pm

It doesn't transit (PowerPoint presentation)

Minimum mass 6.6 Earth masses at 0.0278 AU.
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Re: Short-period super-Earth at GJ 3634

Post by Edasich on 7th February 2011, 5:37 am

http://exoplanet.eu/star.php?st=GJ+3634

But no preprint for the moment.
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Re: Short-period super-Earth at GJ 3634

Post by Edasich on 7th February 2011, 11:28 am

Updated page with preprint. Still no transit, but true mass and orbital inclination determined and hints of a second planetary companion, perhasp within the star's habitable zone

http://exoplanet.eu/star.php?st=GJ+3634
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Re: Short-period super-Earth at GJ 3634

Post by Lazarus on 7th February 2011, 3:26 pm

Determination of the inclination from the light curve despite the lack of transits? Pretty neat!
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Re: Short-period super-Earth at GJ 3634

Post by Sirius_Alpha on 7th February 2011, 7:45 pm

Unless I'm not getting something, you could only get a lower limit to the inclination since you don't know the infrared brightness of the night side. Using the infrared phase curve to get an inclination would depend on the amplitude of course, but there are effects other than inclination that can dilute the amplitude.

Edit: Why hasn't this been done for υ And b? There's a lot of phase curve data for that non-transiting planet.


Last edited by Sirius_Alpha on 7th February 2011, 7:47 pm; edited 2 times in total (Reason for editing : Reworded.)

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Re: Short-period super-Earth at GJ 3634

Post by Edasich on 8th February 2011, 5:53 am

It is a mystery. At least we won't complain about GJ 3634 b revised as a ...SuperJovian planet from astrometry Laughing
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Re: Short-period super-Earth at GJ 3634

Post by tommi59 on 14th February 2011, 11:14 am

Super jovian Very Happy this is good and seriously any chance for transit??Planet is so close to the star it should transit
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Re: Short-period super-Earth at GJ 3634

Post by Edasich on 14th February 2011, 1:44 pm

tommi59 wrote:Super jovian Very Happy this is good and seriously any chance for transit??Planet is so close to the star it should transit

Not seriously. Hoperfully true mass seems ascertained to be 8.4 Earth masses and since no transit has been so far observed, the planet's radius has a lower limit of 1.2 Earth radii. More likely 1.5 Earth radii for a iron-rich to pure iron composition, perhaps dealing with a Kepler-10 b's more nearby analogue. Rolling Eyes
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Re: Short-period super-Earth at GJ 3634

Post by Sirius_Alpha on 14th February 2011, 3:17 pm

Considering what Gliese 1214 b and the Kepler-11 planets have shown us, it would not be unreasonable to expect a thick H/He envelope to drive the radius up beyond that.

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