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 Post subject: News
PostPosted: Fri, 23-08-13, 17:57 GMT 
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News



The problem that a group e.g. of collaborating EXO-fans are permitted to edit jointly e.g. such a listing of EXO resources, is still unsolved. Good ideas are highly appreciated. This post is just a placeholder and should eventually be replaced by the real thing.

Perhaps the moderator could try keeping the listing up-to-date until we have found a better solution?

The version of this phpbb forum is the latest one, 3.0.11.

Fridger

PS: Same holds for the Spice Kernel Workshop


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 Post subject: Re: News
PostPosted: Fri, 30-08-13, 19:56 GMT 
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Nothing new, recently? ;-)

Fridger


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 Post subject: Re: News
PostPosted: Sat, 31-08-13, 0:06 GMT 
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i would have thought that there would be a "group" permission like the "owner" and "other"

now a 777 would not be good but a 664 would

but i have not played with phpbb so...


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 Post subject: Re: News
PostPosted: Sat, 31-08-13, 7:33 GMT 
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John Van Vliet wrote:
i would have thought that there would be a "group" permission like the "owner" and "other"

now a 777 would not be good but a 664 would

but i have not played with phpbb so...


Perhaps you slightly misunderstood: we are working to bring such a group permission into operation. But so far it seems that this issue remains still unsolved within the phpbb framework (unless everyone gets moderator rights ;-) ). Until a solution is found, we would therefore ask the moderators to update the scientific resource listings... Thanks!

Fridger


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PostPosted: Sun, 01-09-13, 10:01 GMT 
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When I asked "Nothing new?" above I was alluding to the fact that the science media currently publish at full load about our Sun's older twin, HIP 102152, while here nothing was even mentioned...

In terms of mass, temperature and chemical composition, the star HIP 102152 located at ~ 250 ly distance, is the closest match to our Sun ever found! But it’s also almost 4 billion years older, providing a most revealing glimpse of what might happen to our 4.6-billion-year-old sun as it ages.

++++++++++++++++++++++++++++++++++++++
While this story has not yet led to direct evidence for EXO planets around HIP 102152, the quest for the existence and properties of possible planets and their comparison with those of our Sun seems most exciting and definitely worth being watched in this new department!
++++++++++++++++++++++++++++++++++++++

Note that like the Sun, HIP 102152 has relatively low amounts of iron, magnesium and silicon, elements that tend to make up the bulk of the mass of rocky planets such as Earth. That could be a first (indirect) sign that the newly discovered star hosts planets.

The story about the Lithium content is also very illuminating (statement by lead author TalaWanda Monroe):
"The group found that HIP 102152 has very low levels of lithium. This demonstrates clearly for the first time that older solar twins do indeed have less lithium than our own sun or younger solar twins. We can now be certain that stars somehow destroy their lithium as they age, and that the sun's lithium content appears to be normal for its age.”

Anyway, here are a couple of interesting links to original papers (available to everyone):

TalaWanda R. Monroe, Jorge Meléndez et al:
Departamento de Astronomia do IAG/USP, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brasil

HIGH PRECISION ABUNDANCES OF THE OLD SOLAR TWIN HIP 102152: INSIGHTS ON Li DEPLETION FROM THE OLDEST SUN*

ApJ 774 L32, 2013
and free of charge
http://arxiv.org/abs/arXiv:1308.5744

and
Jorge Melendez (Universidade de São Paulo)
http://arxiv.org/abs/1307.5274v1
The Sun. A typical star in the solar neighborhood?


Fridger

PS: An image of HIP 102152 (center) from ESO/Digitized Sky Survey 2. Acknowledgement: Davide De Martin

Attachment:
hip-102152.jpg
hip-102152.jpg [ 58.2 KiB | Viewed 2714 times ]


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 Post subject: Re: News
PostPosted: Tue, 03-09-13, 0:44 GMT 
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POTS-1b: A hot Jupiter transiting a dim mid-K dwarf
http://arxiv.org/abs/1308.6574


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 Post subject: Re: News
PostPosted: Wed, 04-09-13, 14:36 GMT 
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Further Evidence of the Planetary Nature of HD 95086 b from Gemini/NICI H-band Data
T. Meshkat, et al.
The failure to detect the companion to HD 95086 reported by Rameau, et al in the H-band (~1.6µm) provides an upper-mass limit to the planet that supports its nature as a planetary companion.


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 Post subject: Re: News
PostPosted: Wed, 04-09-13, 14:58 GMT 
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Blue Light Observations Indicate Water-Rich Atmosphere of a Super-Earth
Narita, N, et al.

The absence of strong Rayleigh scattering in shorter wavelengths argues against a cloudless, H-dominated model for the planetary atmosphere.
Image


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 Post subject: Re: News
PostPosted: Wed, 04-09-13, 15:42 GMT 
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I particularly like the latter news and presentation. It's cute to correlate the transit depth (and hence the apparent planetary radius (fraction)) in various colors with the amount of atmospheric Rayleigh scattering at respective wavelengths.

Looks like a very interesting start of this workshop... ;-)

Fridger


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 Post subject: Re: News
PostPosted: Mon, 09-09-13, 0:57 GMT 
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A resolved debris disk around the candidate planet-hosting star HD95086
A. Moór, et al.
The planet imaged at HD 95086 seems to orbit its host star along the inner edge of a disk inclined at 25 degrees.

--

Star - Planet - Debris Disk Alignment in the HD 82943 system: Is planetary system coplanarity actually the norm?
G M Kennedy, et al.
HD 82943, host of two planets with an inclination of 20±4 degrees, has a debris disk that is found to be inclined by 27±4 degrees, suggesting the planets and debris disk are coplanar. The stellar equator is also inferred to be 28±4 degrees, suggesting that the whole system is coplanar like the Solar system.


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 Post subject: Re: News
PostPosted: Wed, 11-09-13, 0:31 GMT 
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Transit Timing Variation of Near-Resonance Planetary Pairs. II. Confirmation of 30 planets in 15 Multiple Planet Systems
Ji-Wei Xie

By observing transit times for four years measured by Kepler, transit timing variations for several multi-planet systems have allowed for the confirmation of fifteen pairs of planets.

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A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive
Yasuhiro H. Takahashi, et al.

Follow-up observation discovers a secondary star in the system, and finds evidence that all four planet candidates at KOI-94 are real planets.


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 Post subject: Re: News
PostPosted: Mon, 16-09-13, 0:51 GMT 
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The Kappa Andromedae System: New Constraints on the Companion Mass, System Age & Further Multiplicity
Sasha Hinkley, et al.

Previous studies like Bonnefoy et al (2013) have suggested the mass of the companion to κ And could be much higher than first suggested by J. Carson et al (2012). The mass of the companion no longer appears to be in the planetary regime.


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 Post subject: Re: News
PostPosted: Mon, 30-09-13, 0:19 GMT 
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Influence of Stellar Multiplicity On Planet Formation. I. An Insight From Kepler Multiple Planet Candidate Systems
Ji Wang, et al.

Planetary systems seem to be truncated in multi-stellar systems with separations less than 10 AU, suggesting the presence of such a close companion star interferes with planet formation. Also, four KOI planets are validated.


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 Post subject: Re: News
PostPosted: Tue, 01-10-13, 7:16 GMT 
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Inference of Inhomogeneous Clouds in an Exoplanet Atmosphere
Demory, et al.

The visible light phase curve of the hot Jupiter Kepler-7b has revealed that the planet is more reflective westward of the substellar point, indicative of cloud features there.

JPL Release:
http://www.jpl.nasa.gov/news/news.php?release=2013-296

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MOA-2010-BLG-328Lb: a sub-Neptune orbiting very late M dwarf?
Furusawa, et al.

A sub-Neptune orbiting an M dwarf discovered via microlensing.


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 Post subject: Re: News
PostPosted: Wed, 02-10-13, 0:36 GMT 
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MOA-2011-BLG-322 - a "second generation survey" microlensing planet
Shvartzvald, et al.

Another candidate planet from microlensing. This is the first time a planet has been found from microlensing using a pure survey technique as opposed to alerting other assets to assist in observing when a microlensing event is first detected.


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