Giant planets at HD 2952, HD 120084, Ome Ser

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Giant planets at HD 2952, HD 120084, Ome Ser

Post by Sirius_Alpha on 16th April 2013, 8:14 pm

Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and o Serpentis
http://arxiv.org/abs/1304.4328

We report the detections of planetary companions orbiting around three evolved intermediate-mass stars from precise radial velocity measurements at Okayama Astrophysical Observatory. HD 2952 (K0III, 2.5 M_sun) and o Ser (G8III, 2.2 M_sun) host a relatively low mass planet with minimum mass of m_2sin i=1.6 M_J and 1.7 M_J in nearly circular orbits with period of P=312 and 277 d, respectively. HD 120084 (G7 III, 2.4 M_sun) hosts an eccentric planet with m_2sin i=4.5 M_J in an orbit with P=2082 d and eccentricity of e=0.66. The planet has one of the largest eccentricities among those ever discovered around evolved intermediate-mass stars, almost all of which have eccentricity smaller than 0.4. We also show that radial velocity variations of stellar oscillations for G giants can be averaged out below a level of a few m/s at least in timescale of a week by high cadence observations, which enables us to detect a super-Earth and a Neptune-mass planet in short-period orbits even around such giant stars.


Last edited by Sirius_Alpha on 17th April 2013, 7:58 am; edited 1 time in total

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Re: Giant planets at HD 2952, HD 120084, Ome Ser

Post by Edasich on 17th April 2013, 4:18 am

Omicron Serpentis is an A-type delta scuti star. HR 5888 mentioned in the paper indeed matches with Omega Serpentis, which is a G8III giant star.

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Re: Giant planets at HD 2952, HD 120084, Ome Ser

Post by Sirius_Alpha on 17th April 2013, 7:58 am

Edasich wrote:Omicron Serpentis is an A-type delta scuti star. HR 5888 mentioned in the paper indeed matches with Omega Serpentis, which is a G8III giant star.

Wow. Good call. I'll change the thread title.
Edit: I e-mailed Bun'ei Sato about it and got a positive response back.

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Re: Giant planets at HD 2952, HD 120084, Ome Ser

Post by Lazarus on 18th April 2013, 2:16 am

http://arxiv.org/abs/1304.4328v2

It's fixed.

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Re: Giant planets at HD 2952, HD 120084, Ome Ser

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