SuperWASP Results

Page 9 of 12 Previous  1, 2, 3 ... 8, 9, 10, 11, 12  Next

View previous topic View next topic Go down

Re: SuperWASP Results

Post by jyril on 15th September 2011, 5:26 am

Although 70 transiting planets is a truly respectable number, it is nowhere near to the thousands of planets they expected to see in the beginning. See for example this PR release.

Hot Jupiters are not common, and it's terribly tricky to weed out the false positives.

I remember seeing a figure of a total of only 200 planets the project (with HatNET) should be able to detect. That would mean half of the detectable planets have been already found. Has somebody have seen this figure, or am I imagining things?

_________________
The universe is not only stranger than we imagine, it is stranger than we can imagine.
avatar
jyril
Planetesimal
Planetesimal

Number of posts : 133
Registration date : 2008-06-09

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Edasich on 23rd September 2011, 3:40 am

Some updates for WASP-10 b

Analysis of new high-precision transit light curves of WASP-10 b: starspot occultations, small planetary radius, and high metallicity

The WASP-10 planetary system is intriguing because different values of radius have been reported for its transiting exoplanet. The host star exhibits activity in terms of photometric variability, which is caused by the rotational modulation of the spots. Moreover, a periodic modulation has been discovered in transit timing of WASP-10 b, which could be a sign of an additional body perturbing the orbital motion of the transiting planet. We attempt to refine the physical parameters of the system, in particular the planetary radius, which is crucial for studying the internal structure of the transiting planet. We also determine new mid-transit times to confirm or refute observed anomalies in transit timing. We acquired high-precision light curves for four transits of WASP-10 b in 2010. Assuming various limb-darkening laws, we generated best-fit models and redetermined parameters of the system. The prayer-bead method and Monte Carlo simulations were used to derive error estimates. Three transit light curves exhibit signatures of the occultations of dark spots by the planet during its passage across the stellar disk. The influence of stellar activity on transit depth is taken into account while determining system parameters. The radius of WASP-10 b is found to be no greater than 1.03 Jupiter radii, a value significantly smaller than most previous studies indicate. We calculate interior structure models of the planet, assuming a two-layer structure with one homogeneous envelope atop a rock core. The high value of the WASP-10 b's mean density allows one to consider the planet's internal structure including 270 to 450 Earth masses of heavy elements. Our new mid-transit times confirm that transit timing cannot be explained by a constant period if all literature data points are considered. They are consistent with the ephemeris assuming a periodic variation of transit timing.
avatar
Edasich
dM star
dM star

Number of posts : 1510
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: SuperWASP Results

Post by tommi59 on 23rd September 2011, 5:26 am

The radius of the planet 1.03 is the greatest possible because there can be still some star spots left not included in calculation
avatar
tommi59
Jovian
Jovian

Number of posts : 546
Age : 39
Location : Baile Atha Cliath
Registration date : 2010-07-31

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 24th October 2011, 8:15 pm

WASP-36b: A new transiting planet around a metal-poor G-dwarf, and an analysis of correlated noise in transit light curves

http://arxiv.org/abs/1110.5313
We report the discovery, from WASP and CORALIE, of a transiting exoplanet in a 1.54-d orbit. The host star, WASP-36, is a magnitude 12.7, metal-poor G2 dwarf (Teff = 5881 +/- 137 K), with [Fe/H] = -0.31 +/- 0.12. We determine the planet to have mass and radius respectively 2.27 +/- 0.07 and 1.27 +/- 0.03 times that of Jupiter. We have eight partial or complete transit light curves, from four different observatories, which allows us to investigate the extent to which red noise in follow-up light curves affects the fitted system parameters. We find that the solutions obtained by analysing each of these light curves independently are consistent with our global fit to all the data, despite the apparent presence of correlated noise in at least two of the light curves.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Edasich on 25th October 2011, 4:20 am

At last!! It was one year and more after early release with a simple poster!

I see the radius significantly scaled down from 1.4 to 1.27 Jupiter radii. Still a partly inflated hot Jupiter btw Smile
avatar
Edasich
dM star
dM star

Number of posts : 1510
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 13th November 2011, 1:37 am

Another counterexample to the idea that all very highly irradiated planets have thermal inversions, and cooler ones don't: WASP-14 b.
http://arxiv.org/abs/1111.2363

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 17th January 2012, 10:39 pm

Sirius_Alpha wrote:Measurements of Transit Timing Variations for WASP-5b
http://arxiv.org/abs/1009.5769

Guess not.

Transit Monitoring in the South (TraMoS) project: Discarding Transit Timing Variations in WASP-5b
http://arxiv.org/abs/1201.3616

We report nine new transit epochs of the extrasolar planet, observed in the Bessell-I band with SOAR at the Cerro Pachon Observatory and with the SMARTS 1-m Telescope at CTIO, between August 2008 and October 2009. The new transits have been combined with all previously published transit data for this planet to provide a new Transit Timing Variations (TTVs) analysis of its orbit. We find no evidence of TTVs RMS variations larger than 1 min over a 3 year time span. This result discards the presence of planets more massive than about 5 M_earth, 1 M_earth and 2 M_earth around the 1:2, 5:3 and 2:1 orbital resonances. These new detection limits exceed by ~5-30 times the limits imposed by current radial velocity observations in the Mean Motion Resonances of this system. Our search for the variation of other parameters, such as orbital inclination and transit depth also yields negative results over the total time span of the transit observations. This result supports formation theories that predict a paucity of planetary companions to Hot Jupiters.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 18th January 2012, 3:21 am

Another study of several transits of a WASP planet:

The TRAPPIST survey of southern transiting planets. I. Thirty eclipses of the ultra-short period planet WASP-43 b
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 22nd March 2012, 8:28 pm

Spin-orbit alignment constraints for WASP-16, WASP-25 and WASP-31
http://arxiv.org/abs/1203.4971

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 23rd April 2012, 8:15 pm

Seven transiting hot-Jupiters from WASP-South, Euler and TRAPPIST: WASP-47b, WASP-55b, WASP-61b, WASP-62b, WASP-63b, WASP-66b & WASP-67b
http://arxiv.org/abs/1204.5095

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Edasich on 24th April 2012, 8:47 am

The same paper also hints about additional - yet unpublished - WASP planets up to WASP-84 b.

Check: http://www.astro.keele.ac.uk/~ch/wasps.html

So far SuperWASP Survey is the one so far having the highest number of confirmed transiting planets. More than CoRoT and Kepler as well.
avatar
Edasich
dM star
dM star

Number of posts : 1510
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 15th May 2012, 2:18 am

WASP-42 b and WASP-49 b: two new transiting Saturns

A couple of hot, sub-Jupiter-mass planets.
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 22nd May 2012, 8:30 pm

Probing the extreme planetary atmosphere of WASP-12b
http://arxiv.org/abs/1205.4736

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 24th May 2012, 4:59 pm

Comprehensive time series analysis of the transiting extrasolar planet WASP-33b

There appears to be a belt of starspots causing a brightening during the transit, which is odd for a metallic line star (spectral type kA5hA8mF4). Radial velocity measurements have also been used to get a value for the mass (as opposed to the upper limit previously obtained) of 3.180.82 Jupiter masses.
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 6th June 2012, 4:08 am

Secondary Eclipse measurements: Poor heat redistribution in WASP-33 b, orbit is likely circular.
http://arxiv.org/abs/1206.0774

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 6th June 2012, 8:14 pm

Wow, very large giant planets!

WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus
http://arxiv.org/abs/1206.1177

We report the discovery of WASP-78b and WASP-79b, two highly-bloated Jupiter-mass exoplanets orbiting F-type host stars. WASP-78b orbits its V=12.0 host star (TYC 5889-271-1) every 2.175 days and WASP-79b orbits its V=10.1 host star (CD-30 1812) every 3.662 days. A simultaneous fit to WASP and TRAPPIST transit photometry and CORALIE radial-velocity measurements yields planetary masses of 0.89 +/- 0.08 M_Jup and 0.90 +/- 0.08 M_Jup, and radii of 1.70 +/- 0.11 R_Jup and 2.09 +/- 0.14 R_Jup, for WASP-78b and WASP-79b, respectively. The planetary equilibrium temperature of T_P = 2350 +/- 80 K for WASP-78b makes it one of the hottest of the currently known exoplanets. The radius of WASP-79b suggests that it is potentially the largest known exoplanet.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Szaniu on 7th June 2012, 4:47 pm

So many different values of planets radius in this paper Rolling Eyes .

_________________
http://exoplanet-spot.blogspot.com/
avatar
Szaniu
Meteor
Meteor

Number of posts : 19
Age : 28
Location : Poland
Registration date : 2012-02-22

View user profile http://exoplanet-spot.blogspot.com/

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 7th June 2012, 7:05 pm

For each planet, two solutions are given. One assumes the star is a Main-Sequence star, the other assumes it's heading off the Main Sequence. It's important to take this into account because it affects assumptions about the stellar radius, and in turn, the planetary radius. Apparently for both stars, it's not exactly clear if it's moving off the main sequence, so they're taking the side of caution and presenting both solutions.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 19th June 2012, 2:04 pm

arXiv:1206.3585v1 [astro-ph.EP]: z'-band Ground-Based Detection of the Secondary Eclipse of WASP-19b
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 26th July 2012, 3:18 pm

Yes, WASP-17b is a large planet.

High-precision photometry by telescope defocussing. IV. Confirmation of the huge radius of WASP-17b
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 8th October 2012, 8:13 pm

WASP-54b, WASP-56b and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP
http://arxiv.org/abs/1210.2329

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 9th October 2012, 3:57 pm

The hot sub-Jupiters don't seem to be playing ball with the ohmic heating hypothesis for inflating planetary radii.

Seems we still don't know very much about the fundamentals of hot Jupiter physics...
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 11th October 2012, 8:30 pm

TASTE. III. A homogeneous study of transit time variations in WASP-3b
http://arxiv.org/abs/1210.3045

Unable to confirm the previously reported TTV's for WASP-3, but the TTVs are not consistent with a constant period.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Sirius_Alpha on 16th October 2012, 8:54 pm

WASP-64b and WASP-72b
http://arxiv.org/abs/1210.4257

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: SuperWASP Results

Post by Lazarus on 20th October 2012, 5:48 am

Re-Evaluating WASP-12b: Strong Emission at 2.315 micron, Deeper Occultations, and an Isothermal Atmosphere
http://arxiv.org/abs/1210.4836

There is another star that was contaminating the light. Bergfors-6 may be a foreground red dwarf, but the RV is similar to WASP-12 so it could be associated with the system if it is actually an unresolved binary.

High C/O ratio appears to be excluded.
Regardless, our narrowband measurement alone excludes the models used to infer this high C/O ratio at > 3σ. The lack of absorption at a wavelength where CO, a dominant species in any atmospheric model, should exhibit strong absorption is further evidence for a near-isothermal photosphere. Thus secondary eclipse observations are ill-suited to determine WASP-12bs atmospheric composition, and ultimately transmission spectroscopy may be a more successful approach in pursuit of this goal.
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: SuperWASP Results

Post by Sponsored content


Sponsored content


Back to top Go down

Page 9 of 12 Previous  1, 2, 3 ... 8, 9, 10, 11, 12  Next

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum