32 planets from HARPS

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Re: 32 planets from HARPS

Post by Sirius_Alpha on 20th October 2009, 2:59 am

Edasich wrote:I'm still intrigued by the "MORE THAN 30 PLANETS". Are there other worlds to upcome?
I think sources citing that are referring to the planets + brown dwarfs = 32.

Borislav wrote:Another programe carried out by the HARPS-GTO is a lower RV precision planet search.
Ahh okay. These 30 planets must be the result of that lower-precision tag-along programme.

Lazarus wrote:Or if you wish to count VB 10b...
You know... something told me I should have threw the word "Radial-velocity" in there somewhere, but I couldn't remember the reason. There's too many planets to keep up with

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Re: 32 planets from HARPS

Post by Edasich on 20th October 2009, 4:20 am

However no brown dwarf is actually mentioned. Those systems that seemed to host them (HD 85390 and HD 103197) have turned out hosting low mass planets.

There is HIP 103019 left though
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Re: 32 planets from HARPS

Post by Sirius_Alpha on 20th October 2009, 4:31 am

So HD 103197 b changed parameters too eh? Argh.

When the papers for these systems come out, perhaps there will be more planets in some of them (much like how HD 181433 was announced as a 2 planet system back in June of last year, but the paper showed a third planet).

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Re: 32 planets from HARPS

Post by Lazarus on 20th October 2009, 1:27 pm

Edasich wrote:However no brown dwarf is actually mentioned. Those systems that seemed to host them (HD 85390 and HD 103197) have turned out hosting low mass planets.
If you transpose Jupiter and Earth masses, both of those end up in the brown dwarf mass range. Hmmmm.
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Re: 32 planets from HARPS

Post by Edasich on 20th October 2009, 2:18 pm

So HIP 103019 b could be a 0.149 Jupiter masses planet? Since mass is reported 54.6.

However erroneous communications comes from EPE, since message reported "brown dwarfs", whilst objects were actually dwarf jovians.
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Re: 32 planets from HARPS

Post by lodp on 20th October 2009, 8:14 pm

Cannot find anything on arXiv again tonight - where are the submissions? Also thinking that if sub stellar are given b designation when significantly > 13 Mj yet well below 80 Mj (ongoing fusion approx) how are they to be classified?

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Re: 32 planets from HARPS

Post by Sirius_Alpha on 20th October 2009, 9:16 pm

The HD 40307 et al. systems announced last June took several months for their papers to show up.

lodp wrote:...if sub stellar are given b designation when significantly > 13 Mj
yet well below 80 Mj (ongoing fusion approx) how are they to be
classified?
That's a really good question

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Re: 32 planets from HARPS

Post by Lazarus on 21st October 2009, 3:52 pm

I can't remember if it is COROT or SuperWASP that holds the record for longest time between press release and appearance of the discovery paper.
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Re: 32 planets from HARPS

Post by Edasich on 21st October 2009, 4:19 pm

Surely COROT, which seems is going to announce the millennium discovery, the top-secret facts and then...hot jupiters as usual.

Except the one and only super-earth in tightest orbit.
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Re: 32 planets from HARPS

Post by Sirius_Alpha on 24th October 2009, 3:55 am

In the original text-based table, four systems are listed as having a "curved drift", which may mean another planet: HD 44219, HD 148156, HIP 5158, and HD 104067.

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Re: 32 planets from HARPS

Post by Lazarus on 24th October 2009, 2:41 pm

Steinn Sigur­sson's take on this at Dynamics of Cats has some interesting musings about the implications of this for the planet-metallicity correlation.
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Re: 32 planets from HARPS

Post by Sirius_Alpha on 25th October 2009, 9:55 am

Interesting read. Could it be that gas planets aren't actually preferentially formed around high-metallicity stars? Instead, could it be that high metallicity disks simply help to facilitate migration, leading to more easily detected planets?

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Re: 32 planets from HARPS

Post by Edasich on 16th December 2009, 5:00 pm

Updated. Added semimajor axis and eccentricity:

http://exoplanet.eu/star.php?st=BD-082823
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Re: 32 planets from HARPS

Post by Lazarus on 16th December 2009, 5:11 pm

This thread needed a more descriptive title. Updated.
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Re: 32 planets from HARPS

Post by Sirius_Alpha on 16th December 2009, 10:29 pm

Edasich wrote:Updated. Added semimajor axis and eccentricity: http://exoplanet.eu/star.php?st=BD-082823
For which the paper is now available.
http://arxiv.org/abs/0912.3202

As well as
The HARPS search for southern extrasolar planets XXI. Three new giant planets orbiting the metal-poor stars HD5388, HD181720, and HD190984
http://arxiv.org/abs/0912.3216

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Re: 32 planets from HARPS

Post by Edasich on 17th December 2009, 5:09 am

32 exoplanets? What am I missing?
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Re: 32 planets from HARPS

Post by lodp on 17th December 2009, 6:19 am

These are the planets that were announced by Mayor and co. at a conference back in October, but we've been waiting for the papers for. (Atctually 30 + 2 brown dwarfs if I remember correctly)


Last edited by lodp on 17th December 2009, 6:21 am; edited 1 time in total (Reason for editing : Add comment re Brown Dwarfs)

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Re: 32 planets from HARPS

Post by Lazarus on 17th December 2009, 4:00 pm

Sirius_Alpha wrote:As well as
The HARPS search for southern extrasolar planets XXI. Three new giant planets orbiting the metal-poor stars HD5388, HD181720, and HD190984
http://arxiv.org/abs/0912.3216
The interesting part of the abstract:
Our discoveries suggest that giant planets in long period orbits are not uncommon around moderately
metal-poor stars.
So it seems that metal-poor stars have planetary systems with rather different architectures to those around metal-rich stars of similar masses. If you want your gas giants out beyond the ice line, it seems that going for fewer metals is the way to go.
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Re: 32 planets from HARPS

Post by Lazarus on 2nd February 2010, 7:21 pm

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Re: 32 planets from HARPS

Post by Sirius_Alpha on 3rd February 2010, 6:11 am

The movie with that was a real pleasure to watch.

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Re: 32 planets from HARPS

Post by TheoA on 8th February 2010, 1:28 pm

Sirius_Alpha wrote:The movie with that was a real pleasure to watch.

Quite opinionated arn't they.

Really interesting that they think that on quiet stars they might be able to push the
RV sensitivity down to ~ 0.1 MSec-1 with a brute force sampling method.

Wonder how many observations they would need.

58% having low mass planets is quite the prediction!

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Re: 32 planets from HARPS

Post by Sirius_Alpha on 8th February 2010, 4:08 pm

Given a number of observations, if you quadruple them, you can detect signals with half the RV amplitude. If you take 16 times as many observations, then you can detect signals with 1/4 the RV amplitude.

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Re: 32 planets from HARPS

Post by Lazarus on 8th February 2010, 5:28 pm

Regarding pushing down to low mass planets, it looks like there are a couple of upcoming talks in the same program on the matter of detecting exo-Earths.
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Re: 32 planets from HARPS

Post by exoplanet on 10th February 2010, 1:49 pm

Earth-mass Planets with Radial Velocity Methods
StÚphane Udry, Geneva Univ. & KITP

http://online.itp.ucsb.edu/online/exoplanets10/udry2/rm/flash.html

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Re: 32 planets from HARPS

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