Infrared radial velocities of giant stars

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Infrared radial velocities of giant stars

Post by Lazarus on 21st August 2015, 2:35 am

Trifonov et al. "Precise radial velocities of giant stars VIII. Testing for the presence of planets with CRIRES Infrared Radial Velocities"
http://arxiv.org/abs/1508.04769

Testing whether the infrared radial velocities agree with the optical ones. Eight systems for which planets have been reported pass the IR test.
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Re: Infrared radial velocities of giant stars

Post by Sirius_Alpha on 22nd August 2015, 2:37 am

The eight systems in Table 2 are Eta Cet, Eps Tau, 7 CMa, Tau Gem, Pollux, 11 Com, Nu Oph, and 91 Aqr.

For Pollux, whose existence has been questioned recently, they write
For HIP 37826, the near-IR velocity amplitude is larger than the predicted amplitude with KIR/Kopt=1.520.27, but the near-IR value is still within 2-sigma from the best optical semi-amplitude. The reason for the larger KIR/Kopt is most likely the relatively large near-IR RV errors compared to the optical semi-amplitude for HIP 37826. Another complication may be the phase coverage; there are several measurements around the minimum and maximum RV, but in between there is a gap.

Imho, this is positive news for Pollux b.

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