lodp Asteroid
Number of posts : 57 Location : Leeds, UK Registration date : 2009-08-11
| Subject: Abstract for "New Detections of Planet-mass Companions to K-giants by the PTPS Survey," by Alex Wolszczan 29th March 2010, 1:21 pm | |
| Poster session at Exoplanets Rising: Astronomy and Planetary Science at the Crossroads - Quote :
- We present discoveries of planet-mass companions to two K-giant
stars, HD 240237, and BD+20 274, by the ongoing Penn State - Torun Planet Search (PTPS) conducted with the 9.2-m Hobby-Eberly Telescope (HET) and the High Resolution Spectrometer (HRS; R=60,000). For the estimated stellar masses of 0.85 M☉ for HD 240237 and 1.8 M☉ for BD+20 274, the corresponding minimum planet masses are 5.3 MJ and 5.5 MJ, respectively. The Keplerian orbits derived from model fits to the radial velocity data are characterized by the respective semi-major axes of 2 AU and 1.5 AU, eccentricities of 0.37 and 0.27, and orbital periods of 740 days and 720 days. Our analysis of the growing population of substellar –mass bodies orbiting giant stars strengthens the existing evidence for a stellar mass – planet mass correlation, a weak or non-existent correlation between stellar metallicity and planet frequency, and the existence of a lower limit to the orbital radius, which is currently constrained by the observations to be ≤0.6 AU. | |
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: Abstract for "New Detections of Planet-mass Companions to K-giants by the PTPS Survey," by Alex Wolszczan 29th March 2010, 2:57 pm | |
| Uhm, interesting find. Hoping it's not embargo breach. A similar case is that for a couple of brown dwarfs around Iota Aurigae, shown in Extreme Solar System Meeting 2008. No discovery abstract so far. There is Extreme Solar System II to come, hoping to hear some news... | |
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lodp Asteroid
Number of posts : 57 Location : Leeds, UK Registration date : 2009-08-11
| Subject: Re: Abstract for "New Detections of Planet-mass Companions to K-giants by the PTPS Survey," by Alex Wolszczan 29th March 2010, 3:12 pm | |
| - Edasich wrote:
- Uhm, interesting find. Hoping it's not embargo breach.
Abstract publicly available on the web by following link and then there's a link to programme from there which contains abstract links | |
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| Subject: Re: Abstract for "New Detections of Planet-mass Companions to K-giants by the PTPS Survey," by Alex Wolszczan | |
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