HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

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HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Lazarus on 18th November 2010, 3:16 pm

ESO Press Release

HIP 13044 is a horizontal branch star which is part of the Helmi stream. The planet orbits the star with a 16.2-day period.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Edasich on 18th November 2010, 4:39 pm

Extragalactic visitor.alien

And we're ever closer to 500 exoplanets too... Very Happy

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Sirius_Alpha on 18th November 2010, 4:48 pm

Wow! Very interesting find.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Edasich on 19th November 2010, 4:52 am

More infos about the host star are deductable from this paper:

Line Broadening in Field Metal-Poor Red Giant and Red Horizontal Branch Stars

d= 720 pc
M = ? Msol
R = 6.7 Rsol
Teff = 5980 (6020 K)
HZ = 7.3 AUs

Quite a photoevaporating planet then.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Borislav on 19th November 2010, 5:10 am

http://exoplanet.eu/planet.php?p1=HIP+13044&p2=b
[Fe/H]=-2.1
This is a record?

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Lazarus on 19th November 2010, 1:53 pm

I think so. I was wondering about B1620-26, but the metallicity of the Messier 4 globular cluster is around -1.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Sirius_Alpha on 20th November 2010, 11:03 am

An interesting Dynamics of Cats entry on this planet.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Lazarus on 24th November 2010, 3:55 am

The discovery paper is now available on arXiv.

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No planet around HIP 13044?

Post by Lazarus on 17th December 2013, 5:39 pm

Spotted in A&A forthcoming:

No evidence of the planet orbiting the extremely metal-poor extragalactic star HIP13044
M. I. Jones,J. S. Jenkins
Received: 25 June 2013 / Accepted: 25 August 2013
DOI: http://dx.doi.org/10.1051/0004-6361/201322132

Sad

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Lazarus on 30th December 2013, 12:35 pm

And now bumped down into the "unconfirmed, controversial or retracted" section of EPE.
http://exoplanet.eu/catalog/hip_13044_b/

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Stalker on 30th December 2013, 1:13 pm

I will do the same.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Sirius_Alpha on 2nd January 2014, 9:25 pm

No evidence of the planet orbiting the extremely metal-poor extragalactic star HIP13044
http://arxiv.org/abs/1401.0517

CONTEXT: The recent discovery of three giant planets orbiting the extremely metal-poor stars HIP11952 and HIP13044 have challenged theoretical predictions of the core-accretion model. According to this, the metal content of the protoplanetary disk from which giant planets are formed is a key ingredient for the early formation of planetesimals prior to the runaway accretion of the surrounding gas.
AIMS: We reanalyzed the original FEROS data that were used to detect the planets to prove or refute their existence, employing our new reduction and analysis methods.
METHOD: We applied the cross-correlation technique to FEROS spectra to measure the radial velocity variation of HIP13044 and HIP11952. We reached a typical precision of ∼ 35 \ms\, for HIP13044 and ∼ 25 \ms\, for HIP11952, which is significantly superior to the uncertainties presented previously.
RESULTS: We found no evidence of the planet orbiting the metal-poor extragalactic star HIP13044. We show that given our radial velocity precision, and considering the large number of radial velocity epochs, the probability for a non-detection of the radial velocity signal recently claimed is lower than 10−4. Finally, we also confirm findings that the extremely metal-poor star HIP11952 does not contain a system of two gas giant planets. These results reaffirm the expectations from the core-accretion model of planet formation.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

Post by Lazarus on 3rd January 2014, 5:13 am

Reburying HIP 11952 as well, ouch.
Looks like the FEROS-DRS barycentric correction, and taking the time to be the start of the observation rather than the centre may be to blame.

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Re: HIP 13044 - Exoplanet of extragalactic origin? (DISCONFIRMED)

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