Re: Significant exoplanet finding announcement on Monday

Borislav · by Borislav on Mon Oct 19, 2009 11:34 am

http://exoplanet.eu/planet.php?p1=HD+85390&p2=b
0.14 M_J
781 days
0.76 M_sun

How much half-amplitude К m/s ?

Borislav · by Borislav on Mon Oct 19, 2009 11:40 am

Possible continuation of the holiday?

http://www.astro.up.pt/investigacao/conferencias/toe2009/index.php?opt=programme
Monday, 19th October

09:45 - 10:20

IR

RV planet search around solar-type stars: The HARPS GTO legacy

S. Udry

11:20 - 11:45

IT

GJ 581, the M dwarf forerunner

X. Bonfils

15:45 - 16:00

Ground Based Detection of Transiting Hot Earths

C. Burke

Sirius_Alpha · by Sirius_Alpha on Mon Oct 19, 2009 12:07 pm

Borislav wrote:How much half-amplitude К m/s ?

Using those values, it would exert a semi-amplitude of K = 3.7 m/s.

Borislav · by Borislav on Mon Oct 19, 2009 12:18 pm

Borislav · by Borislav on Mon Oct 19, 2009 12:22 pm

Sirius_Alpha wrote:
Borislav wrote:How much half-amplitude К m/s ?
Using those values, it would exert a semi-amplitude of K = 3.7 m/s.

Thank you! I forgot how to count. This opens the way to the discovery of terrestrial worlds in stable stars!

Sirius_Alpha · by Sirius_Alpha on Mon Oct 19, 2009 12:30 pm

Thanks for putting up all the links ^.^

Borislav wrote:This opens the way to the discovery of terrestrial worlds in stable stars!

Gliese 581 e exerts a K = 1.6 m/s signal =o.

Edit: regarding HD 125612 c, it lies more in the Neptune-mass range than the super-Earth range.
Edit2: Gliese 676 Ab, with a mass of 4 Jupiters, is the most massive planet yet detected around a red dwarf (unless you wish to count HD 41004 Bb).

Edasich · by Edasich on Mon Oct 19, 2009 1:25 pm

I'm still intrigued by the "MORE THAN 30 PLANETS". Are there other worlds to upcome?

Lazarus · by Lazarus on Mon Oct 19, 2009 4:35 pm

Hmmm... clearly we've got to the stage where individual detections are not nearly so paper-worthy...

Sirius_Alpha wrote:Edit2: Gliese 676 Ab, with a mass of 4 Jupiters, is the most massive planet yet detected around a red dwarf (unless you wish to count HD 41004 Bb).

Or if you wish to count VB 10b...

Another point... press release mentions that "As with the previously detected super-Earths, most of the new low-mass candidates reside in multi-planet systems, with up to five planets per system." Whether this is a reference to 55 Cancri I don't know (it isn't entirely clear whether that last clause refers to just the new low-mass candidates or the previously-detected super-Earths as well)... certainly it doesn't seem like any of the new systems have more than 3 planets, but I guess we wait for the papers to come out.

lodp · by lodp on Mon Oct 19, 2009 8:04 pm

Doesn't appear to be anything on arXiV for 20th October

Borislav · by Borislav on Tue Oct 20, 2009 12:05 am

Sirius_Alpha wrote:So this is it? This is the results of the HARPS GTO programme?

In GTO sample enter 4 stars, plus 4 red dwarf sample, rest similars

http://arxiv.org/abs/0704.0917
Another programme carried out by the HARPS-GTO is a lower RV precision planet search. It is a survey of about 850 Solar-type stars at a precision better than 3ms. The sample is a volume-limited complement (up to 57.5 pc) of the СORALIE sample (Udry et al. 2000). The goal of this subprogramme is to obtain improved Jupiter-sized planets orbital elements distributions by substantially increasing the size of the exoplanets sample. Statistically robust orbital elements distributions put strong constraints on the various planet formation scenarios.

Sirius_Alpha · by Sirius_Alpha on Tue Oct 20, 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

Edasich · by Edasich on Tue Oct 20, 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

Sirius_Alpha · by Sirius_Alpha on Tue Oct 20, 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).

Lazarus · by Lazarus on Tue Oct 20, 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.

Edasich · by Edasich on Tue Oct 20, 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.