Many new HARPS discoveries?

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Re: Many new HARPS discoveries?

Post by Michael Johne on 10th December 2008, 6:33 am

Hi!

Sirius_Alpha wrote:YES!!!!!

The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47186 and HD181433
http://arxiv.org/abs/0812.1608

Abstract wrote:This paper reports on the detection of two new multiple planet systems around solar-like stars HD47186 and HD181433. The first system includes a hot NeptunHie of 22.78 M_Earth at 4.08-days period and a Saturn of 0.35 M_Jup at 3.7-years period. The second system includes a Super-Earth of 7.5 M_Earth at 9.4-days period, a 0.64 M$_Jup at 2.6-years period as well as a third companion of 0.54 M_Jup with a period of about 6 years. These detections increase to 20 the number of close-in low-mass exoplanets (below 0.1 M_Jup) and strengthen the fact that 80% of these planets are in a multiple planetary systems.

That's right, a third planet at HD 181433!!!
Also, HD 181433 b seems to be quite eccentric, with e = 0.396.

That' correct: http://exoplanet.eu/planet.php?p1=HD+181433&p2=d

And another new exoplanet: http://exoplanet.eu/planet.php?p1=HD+183263&p2=c

Bye!

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Re: Many new HARPS discoveries?

Post by Lazarus on 10th December 2008, 4:54 pm

HD 181433c a=1.76 AU, e=0.28 --> apastron = 2.25 AU
HD 181433d a=3 AU, e=0.48 --> periastron = 1.56 AU

I'd guess from those figures that the configuration presented is unstable... we must wait for the dynamical analysis paper mentioned to resolve this.

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Re: Many new HARPS discoveries?

Post by Sirius_Alpha on 13th December 2008, 12:21 pm

Lazarus wrote:HD 181433c a=1.76 AU, e=0.28 --> apastron = 2.25 AU
HD 181433d a=3 AU, e=0.48 --> periastron = 1.56 AU

I'd guess from those figures that the configuration presented is unstable... we must wait for the dynamical analysis paper mentioned to resolve this.

Indeed, I look forward to that paper.
Perhaps HD 181433 is similar to Mu Arae. When plugging in the planets into Celestia, it looks very much like the three-planet Mu Arae model (though none of the orbits cross this time), even the masses of the planets are similar though scaled down.

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Re: Many new HARPS discoveries?

Post by Sirius_Alpha on 6th February 2009, 10:05 pm

We might learn about more of these low-mass candidates by July or so.

From an upcomming mid-2009 meeting,
The Dynamics of Early Earth-Like Planets and Super-Earths


Convenors: Nader Haghighipour, Lisa Kaltenegger
Keynote: Diana Valencia (Harvard)
This session explores the dynamics of habitable planets through the questions: Is plate tectonic-like behavior a characterisitic of Super-Earths? Is it an inevitable dynamic regime on terrestrial planets in and outside our Solar System, both big and small? Is it a prerequisite for life? When did plate tectonics begin on Earth (current estimates range from ca. 4.4 to 0.8 Ga), and why does it stop? In 2007, astronomers detected the first Super Earths close to the Habitable Zone around a nearby cool star. Of the 35 known Super-Earth candidates, what are the prospects of their being habitable?

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Re: Many new HARPS discoveries?

Post by Lazarus on 7th February 2009, 11:48 am

Quite an impressive statement to drop into an abstract primarily about a different subject (plate tectonics versus planetary discoveries)...

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Re: Many new HARPS discoveries?

Post by Borislav on 16th September 2009, 6:55 am

post delete


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Re: Many new HARPS discoveries?

Post by Edasich on 16th September 2009, 6:59 am

Link is broken.

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Re: Many new HARPS discoveries?

Post by Borislav on 16th September 2009, 7:03 am

post delete


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Re: Many new HARPS discoveries?

Post by Edasich on 16th September 2009, 7:08 am

If you have got the file, I dunno if you could host it somewhere.

If this doesn't make embargo breach, of course.

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Re: Many new HARPS discoveries?

Post by Lazarus on 16th September 2009, 5:18 pm

Hosting elsewhere is just a means of getting round the embargo. Not kosher.

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Re: Many new HARPS discoveries?

Post by Edasich on 17th September 2009, 4:18 am

However, from what I've read, there's no unpublished discovery.
Just remembers how much planets they have discovered in 2006.

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Re: Many new HARPS discoveries?

Post by Sirius_Alpha on 17th August 2011, 8:11 pm

The HARPS search for Earth-like planets in the habitable zone: I -- Very low-mass planets around HD20794, HD85512 and HD192310
http://arxiv.org/abs/1108.3447

In 2009 we started, within the dedicated HARPS-Upgrade GTO program, an intense radial-velocity monitoring of a few nearby, slowly-rotating and quiet solar-type stars. The goal of this campaign is to gather, with high cadence and continuity, very-precise radial-velocity data in order to detect tiny signatures of very-low-mass stars potentially in the habitable zone of their parent stars. 10 stars have been selected among the most stable stars of the original HARPS high-precision program, uniformly spread in hour angle, such that three to four of them are observable at any time of the year. For each star we record 50 data points spread over the observing season. The data point consists of three nightly observations of a total integration time of 10 minutes each and separated by 2 hours. This is an observational strategy adopted to minimize stellar pulsation and granulation noise. In this paper we present the first results of this ambitious program. The radial-velocity data and the orbital parameters of five new and one confirmed low-mass planets around the stars HD20794, HD85512} and HD192310, respectively, are reported and discussed, among which a system of three super-Earths and one harboring a 3.6-Earth-mass planet at the inner edge of the habitable zone. This result already confirms previous indications that low-mass planets seem to be very frequent around solar-type stars and that this occurrence frequency may be higher than 30%.

I've made a thread here to discuss the (modelling of the) habitability of HD 85512 b, as no doubt more research on that topic will appear.

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Re: Many new HARPS discoveries?

Post by Edasich on 18th August 2011, 2:35 am

Very bearby and some even habitable. The best planets so far found. And it's getting closer some discovery concering stars as Alpha Centauri, Tau Ceti or Zeta Tucanae.

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Re: Many new HARPS discoveries?

Post by Lazarus on 18th August 2011, 2:01 pm

Edasich wrote:And it's getting closer some discovery concering stars as Alpha Centauri, Tau Ceti or Zeta Tucanae.
Talking of the "big name" stars, HD 20794 might be more familiar as 82 Eridani...

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Re: Many new HARPS discoveries?

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