New HARPS Planets

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Re: New HARPS Planets

Post by Edasich on 23rd December 2014, 4:31 am

New HARPS planets!

The HARPS search for southern extra-solar planets XXXVI: Five new long-period giant planets and a system update

We describe radial-velocity time series obtained by HARPS on the 3.60 m telescope in La Silla (ESO, Chile) over ten years and report the discovery of five new giant exoplanets in distant orbits; these new planets orbit the stars HD 564, HD 30669, HD 108341, and BD-114672. Their periods range from 492 to 1684 days, semi-major axes range from 1.2 to 2.69 AU, and eccentricities range from 0 to 0.85. Their minimum mass ranges from 0.33 to 3.5 Mjup. We also refine the parameters of two planets announced previously around HD 113538, based on a longer series of measurements. The planets have a period of 663+-8 and 1818+-25 days, orbital eccentricities of 0.14+-0.08 and 0.20+-0.04, and minimum masses of 0.36+-0.04 and 0.93+-0.06 Mjup. Finally, we report the discovery of a new hot-Jupiter planet around an active star, HD 103720; the planet has a period of 4.5557+-0.0001 days and a minimum mass of 0.62+-0.025 Mjup. We discuss the fundamental parameters of these systems and limitations due to stellar activity in quiet stars with typical 2m/s radial velocity precision.

Glad to see that BD-11° 4672 b is treated no more as stellar activity but as planet. Very Happy
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Re: New HARPS Planets

Post by Lazarus on 23rd December 2014, 8:08 am

Hmm losing track of which HARPS planets have been published or not... don't think these were in the original batch of 32 though.
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New HARPS Planets

Post by Shellface on 23rd December 2014, 8:46 am

Yes, these are mostly new. They should go in their own thread, like the previous HARPS paper.

All of the results seem fairly ordinary. I did notice the revised period for HD 113538 b earlier this year when working with the archive, but concluded it was dynamically difficult (P2/P1 ≈ 2.7). Now the solution is unambiguous, so I'll have to see if it's less unstable.

Also, they really didn't check whether the Hot Jupiter is transiting? I can't find any transit surveys that have observed the star, so it's not implausible…

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Re: New HARPS Planets

Post by Lazarus on 23rd December 2014, 9:09 am

High eccentricty for HD 108341b (is it just my software, or are various bits of the text non-readable, e.g. most of the star names in table 2) - pity the argument of periastron isn't near 90 degrees which would be most helpful for transits, or 270 degrees for eclipses.
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Re: New HARPS Planets

Post by Sirius_Alpha on 23rd December 2014, 9:30 am

Looks like it's the actual text. I'm unable to read it as well.

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Re: New HARPS Planets

Post by Sirius_Alpha on 24th December 2014, 10:16 am

Follow-up. I've downloaded the paper's source and looked at the LaTeX, fixed some rather sloppy errors/typos and recompiled it. The author defined LaTeX commands \a, \b, \c, \d, ... etc to define each of the star names and it doesn't look like they were particularly consistent between the definitions and how they were called in the paper (for example, even in a definition line, a letter is doubled). Rather than re-post the entire paper, I've taken a screenshot of the relevant table and posted it here.


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Re: New HARPS Planets

Post by Lazarus on 29th December 2014, 2:24 pm

Great, thanks!
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Re: New HARPS Planets

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