IR RV VB 10 b detection

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IR RV VB 10 b detection

Post by Sirius_Alpha on 27th August 2009, 9:02 am

Infrared radial velocities of vB 10
http://arxiv.org/abs/0908.3751

Abstract wrote:We present radial velocities of the M8V-type, very low-mass star vB 10 that have been obtained at four different epochs of observations between 2001 and 2008. We use high-resolution (R ~ 20,000) near-infrared (J-band) spectra taken with the NIRSPEC instrument on the Keck II telescope. Our data suggest that vB 10 shows radial velocity variability with an amplitude of ~1 km/s, a result that is consistent with the recent finding of a massive planet companion around the star by Pravdo & Shaklan (2009). More velocity measurements and a better sampling of the orbital phase are required to precisely constrain the orbital parameters and the individual masses of the pair.

(and yes, I did have fun thinking up the thread title =P)

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Re: IR RV VB 10 b detection

Post by Lazarus on 28th August 2009, 6:12 pm

Infrared radial velocities? Nice stuff... if the infrared radial velocity measurements can reach comparable precision to the visible wavelengths stuff, things start to look promising for detecting planets around late-type stars of spectral types M and L.

For example the star 55 Cancri B has a V-band magnitude of 13.15, which is very dim, not good for making radial velocity measurements. In the J-band it is a much more promising 8.560, and in the K-band is 7.666. And with 55 Cancri A harbouring so many massive planets, you've got to wonder what's in orbit around the companion.
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Re: IR RV VB 10 b detection

Post by Sirius_Alpha on 28th August 2009, 11:21 pm

I've always wondered about 55 Cnc B myself as well. Maybe 55 Cnc B will make as much a mockery of planet formation theories as Gliese 876.

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