SuperWASP Results

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Re: SuperWASP Results

Post by Sirius_Alpha on 13th April 2010, 1:26 pm

Not a problem =).
That's a very significant fraction of planets.
If planet-planet scattering plus the Kozai mechanism in some cases can explain why the inclinations of the orbits are so non-uniform, how much of a role does planetary migration play in depositing hot Jupiters at their observed location?

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Re: SuperWASP Results

Post by Lazarus on 13th April 2010, 1:42 pm

Significant fraction of hot Jupiters at least, though these are probably not the most common planets. It'll be interesting to see what the distribution is for the more common eccentric Jupiters.

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Re: SuperWASP Results

Post by Sirius_Alpha on 13th April 2010, 1:55 pm

I would expect the eccentric Jupiters to display the same distribution of spin-orbit alignments if the origin of such planet's orbits is indeed planet-planet scattering.

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Re: SuperWASP Results

Post by Lazarus on 13th April 2010, 2:11 pm

According to the paper about the alignment results, it's consistent with predictions of Kozai+tidal friction. Whether this mechanism is also responsible for the eccentric Jupiters is another matter...

On another note, WASP-33b=HD 15802b... so much for the idea that intermediate-mass stars only have planets beyond ~0.6 AU...

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Re: SuperWASP Results

Post by Borislav on 13th April 2010, 2:24 pm

Lazarus wrote:On another note, WASP-33b=HD 15802b... so much for the idea that intermediate-mass stars only have planets beyond ~0.6 AU...

WASP-33 mass star 1.50 ± 0.03 Solar Masses

Similar systems for mass stars from the Encyclopedia
http://exoplanet.eu/planet.php?p1=OGLE2-TR-L9&p2=b
http://exoplanet.eu/planet.php?p1=HAT-P-7&p2=b
http://exoplanet.eu/planet.php?p1=HD+38529&p2=b

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Re: SuperWASP Results

Post by Lazarus on 13th April 2010, 2:38 pm

Ah ha.

kA5hA8mF4

Hydrogen lines and effective temperature class A8, so at the lower end of spectral type A.

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Re: SuperWASP Results

Post by Sirius_Alpha on 13th April 2010, 3:17 pm

Furthermore, most of the intermediate mass stars with planets have been giant stars. I would expect them to have tidally eaten their close-in planets.

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Re: SuperWASP Results

Post by Borislav on 14th April 2010, 6:41 am

read more detailed article

http://www.superwasp.org/documents/bouchy2010_wasp21.pdf
Transiting exoplanets from the lowest metallicity stars [Fe/H]=-0.46

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Re: SuperWASP Results

Post by Sirius_Alpha on 15th April 2010, 12:56 pm

In the paper about the RM effect measurements, WASP-17 b's radius is revised upward to ~1.977 RJ (!!).

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Transit timing variations at WASP-3b -- 15 M_e companion?

Post by Sirius_Alpha on 7th June 2010, 8:15 pm

Transit timing variation in exoplanet WASP-3b
http://arxiv.org/abs/1006.1348

Abstract wrote:Photometric follow-ups of transiting exoplanets may lead to discoveries of additional, less massive bodies in extrasolar systems. This is possible by detecting and then analysing variations in transit timing of transiting exoplanets. We present photometric observations gathered in 2009 and 2010 for exoplanet WASP-3b during the dedicated transit-timing-variation campaign. The observed transit timing cannot be explained by a constant period but by a periodic variation in the observations minus calculations diagram. Simplified models assuming the existence of a perturbing planet in the system and reproducing the observed variations of timing residuals were identified by three-body simulations. We found that the configuration with the hypothetical second planet of the mass of about 15 Earth masses, located close to the outer 2:1 mean motion resonance is the most likely scenario reproducing observed transit timing. We emphasize, however, that more observations are required to constrain better the parameters of the hypothetical second planet in WASP-3 system. For final interpretation not only transit timing but also photometric observations of the transit of the predicted second planet and the high precision radial-velocity data are needed.

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Re: SuperWASP Results

Post by Edasich on 8th June 2010, 10:49 am

Waiting for its confirmation

http://exoplanet.eu/star.php?st=WASP-3

Shouldn't this one be merged with SuperWASP results thread?

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Re: SuperWASP Results

Post by Sirius_Alpha on 8th June 2010, 10:58 am

Edasich wrote:Shouldn't this one be merged with SuperWASP results thread?
Done.

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Re: SuperWASP Results

Post by Edasich on 8th June 2010, 11:03 am

Fine, thanks. Wink

Looks like an interesting system, if confirmed.

Someway similar to Gliese 436, though no 2nd planet so far confirmed (even someone still claiming that there is evidence of a close, low-mass 2nd planet).

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Re: SuperWASP Results

Post by Lazarus on 8th June 2010, 3:34 pm

Well Exoplanets Data Explorer says there are only 20 Doppler observations so far, wonder how well this proposed companion will hold up.

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Re: SuperWASP Results

Post by Edasich on 8th June 2010, 4:36 pm

As long as HD 17156 c, perhaps. Let's cross fingers.

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Re: SuperWASP Results

Post by lodp on 9th June 2010, 3:40 pm

Line-profile tomography of exoplanet transits – II. A gas-giant planet
transiting a rapidly rotating A5 star:

ABSTRACT




Most of our knowledge of extrasolar planets rests on
precise radial-velocity measurements, either for direct detection or for
confirmation of the planetary origin of photometric transit signals.
This has limited our exploration of the parameter space of exoplanet
hosts to solar- and later-type, sharp-lined stars. Here we extend the
realm of stars with known planetary companions to include hot,
fast-rotating stars. Planet-like transits have previously been reported
in the light curve obtained by the SuperWASP survey of the A5 star
HD 15082 (WASP–33; V=
8.3, v sin i= 86 km s−1 ).
Here we report further photometry and time-series spectroscopy through
three separate transits, which we use to confirm the existence of a
gas-giant planet with an orbital period of 1.22 d in orbit around
HD 15082. From the photometry and the properties of the planet signal
travelling through the spectral line profiles during the transit, we
directly derive the size of the planet, the inclination and obliquity of
its orbital plane and its retrograde orbital motion relative to the
spin of the star. This kind of analysis opens the way to studying the
formation of planets around a whole new class of young, early-type
stars, hence under different physical conditions and generally in an
earlier stage of formation than in sharp-lined late-type stars. The
reflex orbital motion of the star caused by the transiting planet is
small, yielding an upper mass limit of 4.1 MJupiter
on the planet. We also find evidence of a third body of substellar mass
in the system, which may explain the unusual orbit of the transiting
planet
. In HD 15082, the stellar line profiles also show evidence of
non-radial pulsations, clearly distinct from the planetary transit
signal. This raises the intriguing possibility that tides raised by the
close-in planet may excite or amplify the pulsations in such stars.


http://www3.interscience.wiley.com/journal/123502842/abstract?CRETRY=1&SRETRY=0



Last edited by lodp on 9th June 2010, 3:42 pm; edited 1 time in total (Reason for editing : Highlight Third Body sentance)

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Re: SuperWASP Results

Post by Sirius_Alpha on 14th June 2010, 8:24 pm

WASP-21 b paper now on ArXiv.

WASP-21b: a hot-Saturn exoplanet transiting a thick disc star
http://arxiv.org/abs/1006.2605

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Re: SuperWASP Results

Post by Sirius_Alpha on 28th June 2010, 8:15 pm

WASP-8 paper...
http://arxiv.org/abs/1006.5089

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Re: SuperWASP Results

Post by Borislav on 9th July 2010, 10:23 am

Sirius_Alpha wrote:Transit timing variation in exoplanet WASP-3b
http://arxiv.org/abs/1006.1348


http://www.astrobio.net/pressrelease/3550/a-new-way-to-find-earths Gives virus alert on Avast -- probably a false positive
http://www.alphagalileo.org/ViewItem.aspx?ItemId=80783&CultureCode=en


Last edited by Sirius_Alpha on 9th July 2010, 11:34 am; edited 1 time in total (Reason for editing : Making note of false positive virus identification through Avast -- Sirius Alpha)

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Re: SuperWASP Results

Post by Sirius_Alpha on 9th July 2010, 11:35 am

Looks like they're handling this like Gliese 436 c

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Re: SuperWASP Results

Post by Edasich on 9th July 2010, 12:50 pm

Sirius_Alpha wrote:Looks like they're handling this like Gliese 436 c

And the suggestive fact is that it would a double planet system with low-mass component around a brighter and more massive star than Sol.

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Re: SuperWASP Results

Post by Borislav on 9th July 2010, 1:53 pm

First Source News

http://www.ras.org.uk/news-and-press/157-news2010/1860-discovering-new-earths
http://www.astro.uni-jena.de/wasp-3/


This is the so-called O-C diagram. We plot the difference between observed (O) transit time and calculated (C) expected transit time on the y-axis in minutes versus the time given as orbital periods of the known planet WASP-3b. We plot the previously published transit times as blue dots and our own new measurements as red dots. If there would be only one planet around the star WASP-3, then all points should be on one straight line. If there would be a second planet with 15 Earth masses and 3.75 day orbital period (called WASP-3c), then this second planet would modify the orbital period of the first known planet (WASP-3b, 2 Jupiter masses in 2 day orbit) in such a way as shown by the black line, which we have calculated. This is the best fitting configuration, i.e. indirect

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Re: SuperWASP Results

Post by Borislav on 19th July 2010, 6:02 pm

http://www.obs-hp.fr/ohp2010/submitted_abstracts-1.pdf

Title: New WASP-North discoveries: understanding the structure and evolution of transiting exoplanets.
Abstract:
The WASP project is now in its maturity and it is responsible for the discovery of 42 new confirmed transiting exoplanets (more than 50\% of the total), which establish WASP, as the world's leading project for transiting exoplanets. I will present the WASP-North latest discoveries and I will discuss their implications for
understanding the exoplanets structure and evolution. I will also present results for the known WASP planets with non-zero eccentricities, and our search for secular terms in the star reflex motion, possibly caused by additional planetary companions in the system.

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Re: SuperWASP Results

Post by Borislav on 20th July 2010, 2:47 pm

http://nexsci.caltech.edu/workshop/2010/popschedule.shtml
WASP 36-b: A New Transiting Planet
http://nexsci.caltech.edu/workshop/2010/pops/Schlawin_pop.pdf

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Re: SuperWASP Results

Post by Borislav on 20th July 2010, 4:14 pm

Borislav wrote:Surprised, but now there has information on almost all the planets, except for WASP-20, 27, 30, 31, 32, 34.

WASP-31b
http://nexsci.caltech.edu/workshop/2010/pops/pop-anderson.pdf

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Re: SuperWASP Results

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