CoRoT Results

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Re: CoRoT Results

Post by Lazarus on 4th October 2008, 12:42 pm

Well, it is amusing to note that after the initial "have we discovered a new class of object?" announcement and discussions of "compact brown dwarfs"...
As illustrated in Fig 10, CoRoT-Exo-3b parameters are in good agreement with the expected mass-radius relationship on the low-mass tail of these substellar objects.
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Re: CoRoT Results

Post by jyril on 5th October 2008, 3:34 pm

Planet news from the Dynamics of Cats blog... COROT has apparently found a planet with radius < 2 Re!

What's more, HARPS has detected tens of new planets with m < 50 Me and 40+ with m < 30 Me.

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Re: CoRoT Results

Post by Sirius_Alpha on 5th October 2008, 6:48 pm

jyril wrote:Planet news from the Dynamics of Cats blog... COROT has apparently found a planet with radius < 2 Re!

Yeah those guys from CoRoT have been teasing us with that for a long time. I've decided to quit biting. You'll find that specific object was the topic of discussion earlier in this thread, where I posted its light curve. About the HARPS stuff, yeah, we were told about ~30 candidates like that a while ago, which apparently HD 40307 and company were supposed to be the first taste of.

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Re: CoRoT Results

Post by Darkness nova on 18th October 2008, 2:27 pm

I fail to understand why they tease us with these things so?

If they don't want to publish it in fear of it being stolen by others keep it under wraps if they've taken care of that THEN TELL US ALREADY!!!!

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Re: CoRoT Results

Post by Sirius_Alpha on 18th October 2008, 5:10 pm

They're trying to make certain that their conclusions are accurate.

I think the failing with the CoRoT team is not publishing their data too late, but telling us of it too early.

Remember that HD 40307 was studied for like two years even after they believed they had a 3-planet model, all for the sake of gathering more data to be sure.

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Re: CoRoT Results

Post by Lazarus on 18th October 2008, 5:19 pm

The annoying thing is the press releases announcing the discoveries long before any kind of paper appears, which leaves the details sketchy.

I was going to say that at least HD 40307 didn't have this problem, but there was a delay between the announcement and the discovery. And whatever happened to HD 181433 and HD 47186?
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Re: CoRoT Results

Post by Sirius_Alpha on 18th October 2008, 5:34 pm

Lazarus wrote: And whatever happened to HD 181433 and HD 47186?
That's been on my mind a lot, too. Less than a month after HD 40307 b and company was announced, a paper on Arxiv about it.

While we're on the topic of waiting, we're supposed to get HD 80606 b data sometime... data that was gathered last year. Apparently the planet was observed to undergo secondary transits.

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Re: CoRoT Results

Post by Darkness nova on 19th October 2008, 6:00 pm

Thats true.

Hence why they should just keep quiet about it till a bit later.

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Re: CoRoT Results

Post by Sirius_Alpha on 27th October 2008, 9:01 pm

Darkness nova wrote:Hence why they should just keep quiet about it till a bit later.

Agreed.

Though it's not quite exoplanet related, it is CoRoT related. It seems CoRoT was used to determine the interior structures of three type F stars, HD 49933, HD 181420, and HD 181906.
http://www.sciencedaily.com/releases/2008/10/081023144044.htm

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Re: CoRoT Results

Post by Darkness nova on 28th October 2008, 5:57 pm

Hmm granulation is three times finer eh?

Okay please put up with the stupididty in this question but:What do they mean by finer? As in you can see it better or that it's smaller?

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Re: CoRoT Results

Post by Sirius_Alpha on 28th October 2008, 8:00 pm

Honestly, I don't know.

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Re: CoRoT Results

Post by Sirius_Alpha on 4th November 2008, 9:09 pm

Hmm. Perhaps some planet-induced activity on CoRoT-Exo-2.

Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star
http://arxiv.org/abs/0811.0461

Abstract wrote:The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoT-Exo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 Gyr. We present a spot modelling of the optical variability of the star during 142 days of uninterrupted observations performed by CoRoT with unprecedented photometric precision. We apply spot modelling approaches previously tested in the case of the Sun by modelling total solar irradiance variations. To model the light curve of CoRoT-Exo-2a, we take into account both the photometric effects of cool spots as well as those of solar-like faculae, adopting solar analogy. Two active longitudes initially on opposite hemispheres are found on the photosphere of CoRoT-Exo-2a with a rotation period of 4.522 $\pm$ 0.024 days. Their separation changes by approximately 80 degrees during the time span of the observations. From this variation, a relative amplitude of the surface differential rotation lower than about 1 percent is estimated. Individual spots form within the active longitudes and show an angular velocity about 1 percent smaller than that of the longitude pattern. The total spotted area shows a cyclic oscillation with a period of 28.9 $\pm$ 4.3 days, which is close to 10 times the synodic period of the planet as seen by the rotating active longitudes. The implications of such results for the internal rotation of CoRoT-Exo-2a are discussed on the basis of solar analogy. A possible magnetic star-planet interaction is suggested by the cyclic variation of the spotted area. Alternatively, the 28.9-d cycle may be related to Rossby-type waves propagating in the subphotospheric layers of the star.

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Re: CoRoT Results

Post by Sirius_Alpha on 27th November 2008, 9:04 pm

Concerning the 2009 CoRoT conference...

CoRoT - List of submitted abstracts
(from http://www.symposiumcorot2009.fr/ )


  • Analysis of Power Spectra of Sun-Like Stars Using a Bayesian Approach
  • Observations of Transiting Extrasolar Planets with the Aiu Jena Telescope in Grossschwabhausen.
  • Plato: Planetary Transits And Oscillations of Stars
  • Photospheric Activity And Surface Differential Rotaion in the Planet Hosting Stars Corot-Exo-2a & 4a
  • Stellar Activity and Spectral Classification: A quantitative Analysis from the Corot Light Curves
  • Short Flux Rixes During Transit Events: Starspots or a Second Transiting Planet
  • The HD49933 Case
  • Stellar Metallicities and Planet Migration in Corot-Exo Systems
  • New Insight on Photometric Perturbations of Corot Light Curbes
  • Dynamical Modelling of Asteroseismic Targets Combining 3d and 1d Models
  • Searching for Transiting Circumbinary Planets in Corot Data using Cb-Bls
  • Exoplanets Channel Point Spread Function Estimation
  • Solar-Like Oscillations in the F Star HD 181420 as Observed by Corot
  • Solar-Like Oscillations in Red Giants as Observed by Corot: The Case of HD 50890
  • Transiting Exoplanets from the Corot Space Mission VII: Corot-Exo-6b: A Giant Planet in a 9d Orbit
  • Corot Data Production and Distribution: Past and Future
  • The Corot Planetary Transit Detection Threshold
  • First Seismic Modelling of Corot Be Stars
  • HD 51106: An ellipsoidal Binary observed with Corot
  • HD 50747: Analysis of Corot Data
  • Brite-Constellation on the Shoulders of Corot
  • Frequency Analysis of the Sismo Field Gamma Dorados Star: HD 49434
  • Gamma Doradus in the Exoplanet Fields: First Inspection
  • Planetary Transit Candidates in the Corot-Ira-01 Field
  • Preliminary Results for HgMn stars from the Corot observations
  • Theories of planet formation and migration
  • Carmenes: A new nir eschelle spectrograph for exoplanet and asteroseismology research
  • Bayesian approach for the identification of solar like star oscillations, with a maximum A posterior
  • Mode identification in rapidly rotating stars.
  • Evolutionary status determination from detection of Nir excesses in the seds
  • Noise in the Corot Exo-field lightcurves
  • Spectroscopic study of solar-like stars selected for candidates for Kepler Asteroseismic targets
  • Spectroscopic characterization of early-type kepler targets candidates
  • Radial Velocity Follow-up of Corot candidates: Strategy, facilities, and results
  • Characterization of a planet's parameters using the Rossiter-McLaughlin Effect
  • Corot Additional Programs on Binary stars
  • The Domain of Delta Scuti Stars: Corot Ira01 Results
  • On Extracting signatures of small convective cores from Space-based data
  • Short run data analysis of two delta scuti stars: HD 174936 & HD 174966
  • The Asteroseismic ground-based observational counterpart of Corot
  • The Be star HD 50209: Results from the seismology field data
  • Hydrodynamical secular transport processes in rotating stars
  • Identifying red giants in the corot exofield data
  • Exodat: Exo-planets information system: Evolutions
  • Properties of binary systems found in the Corot exoplanet search
  • Improving transit search algorithms by appropriate prefiltering of Corot lightcurves
  • The mass loss boundary for hot gas giants: what can we learn from transit observations.
  • An efficient algorithm for analysis of stellar light curves and detection of transits
  • New analysis of the evolved, semi-detached massive binary AU Mon baesd on Corots first observations.
  • Theoretical amplitudes and life-times of non-radial solar-like oscillations in red giants
  • Characterisation of stellar variability in the corot fields with Best/Best Ii
  • Characterization of Corot variaible stars with flames adn statistical study of pulsations of Be stars
  • Cleaning Corot lightcurves with polyfit and sysrem
  • Seismic analysis of HD 49330 from Corot and spectroscopic data
  • Which constraints can we set on the convective core of HD 49933?
  • Analysis of the Corot results: Statistical study of the underlying planet population
  • Timing variations on binaries with Corot
  • The enigmatic granulation background of HD 49933
  • Improving corot planets parameters with transit reconstruction in the presence of stellar activity
  • Initial run of Corot: How we learned and what we learned
  • HD 50844: A new look to delta scuti stars from space
  • Analysis and modelling of the Delta Scuti stars ID7528 and ID7613
  • Discovery of Low-Amplitude periodic variables with 0.1 Millimag amplitude in Corot lightcurves
  • A spectroscopic survey of B-type stars in the Corot fields
  • The sacy project in the Corot windows
  • Development of a hybrid algorithm for time-resolved stellar photometry from space images.
  • Accurate fundamental parameters of Corot asteroseismic targets
  • The compositions of Corot giant planets: implications for planet formation
  • Corots view on Strange-mode oscillatons: The case of the B6I supergiant HD 50064
  • Pulsating B stars in Corot's exofield data: Discoveries, frequencies, and general properties.
  • A complex asteroseismic analysis of the Beta Cephei star Theta Ophiuchi
  • The Beta Cephei star HD 180642: Full integration of Corot and Ground data for mode identification
  • Progress in front of Extreme Horizontal Branch Stars Asteroseismology
  • Red noise properties of the Corot exoplanet data
  • Young low mass eclipsing binaries in NGC 2264
  • New models for the Corot primary target HD 52265, including core overshooting.
  • Automated classification of light curves in the corot exoplanet database
  • The Beta Cephei star HD 180642: Analysis of the Corot Light Curve
  • Exofield oscillationg red giants: Fundamental parameters and First results from Asteroseismology
  • Automated frequency analysis and light curve modelling for Corot exofield data
  • Exofield red giants: Fundamental parameters and first results from asteroseismic modelling
  • From imagette to lightcurve: The exo-imagette pipeline
  • Spectroscopic analysis for the Corot planet host stars
  • Searching for trojan asteroids in the HD 209458 and other exoplanetary systems.
  • Interferences from Adiabatic analysis of Solar-like oscillations in Red giants
  • Seismic modelling of the Red-giant Corot Target HD 181907
  • Slowly pulsating B stars in the Corot Sismo fields
  • Excitation of G-modes in He burning blue supergiants
  • Interpretating the observations of HD 49933
  • GSC 06272-01557, the First Beta Cephei star discovered with MOST
  • Fitting multi-planet models to Corot time-data series by evolutionary algorithms.
  • Multi-object spectroscopy in the Corot Lra01 field: The stellar content in the anti-center direction
  • A simulator of photometric surveys: Application to Corot in the exoplanet field
  • Planet formation and the Corot planet census
  • Planet formation byy Nucleated instability: predictions for Corot
  • Time autocorrelation as a diagnostic of solar-like stars
  • Modelling Corot's solar like stars
  • Small separations and phase shifts differences of $\EII=0,1$ P-Modes
  • Asteroseismology of intermediate mass stars in NGC 2264
  • Saimois: Ground-based asteroseismic observations in 1 Site in Antarctica
  • Photometric magnetic structures: Spot modelling and analysis of the Fourier spectrum
  • The photometric follow-up of Corot planet candidates
  • Solar-like oscillations and activity in HD 175726
  • Modelling of pulsations of giant stars
  • Time-frequency analysis of light curves of Corot Be stars
  • The Procyon campaign: Frequency analysis and maximum likelihood estimation of mode parameters
  • First RR Lyrae light curves from Corot: multiperiodicity and Blazhko phenomenon
  • Structure and composition of Super-Earths
  • Vlt High-Precision Transit Photometry for Corot planets
  • Asteroseismic modelling of Procyon A based on the Recent Frequency analysis
  • Atmospheric study of the young Corot-Exo-2b planet with Spitzer
  • P-mode characteristics of HD 181906
  • Enhancing the Signal-to-noise ratio of solar-like targets
  • Solar-like oscillatons in the red giants with Corot
  • Spectroscopic analysis of a large sample Corot/Exoplanet targets using the Flames instrument
  • Planetary transit discrimination with the help of color information in Corot Light curves
  • Rotation, convetion and activity on giant stars: Corot preliminary results
  • Laser adn Z Pinch experiments revealing plasma properties of seismic probes through the HR diagram
  • Assessing the confience of low signal-to-noise transit candidates from Corot Light Curves
  • Selection of most promising candidates in the Corot mission for radial-velocity follow-up
  • Corot-Exo-2 starspots physical characteristics.
  • Exploration of parameter space for modelling Corot targets with Cesam/Cles Codes
  • Thorough analysis of seismic properties of the solar-like Corot target HD 49933
  • The Corot secondary target HD 174884: A serendipitious EB-SB2
  • The transiting exoplanet Corot-Exo-5b
  • Structure and evolution of Corot planets. Probing the brown dwarf - Panet overlapping domain.
  • How can we detect planets in exchange orbits
  • Accretion dynamics and star-disk interaction in NGC 2264
  • Spectroscopic determination of physical parameters of stars in planetary systems
  • Young planetary systems and the Corot satellite
  • Analysis of Corot Be star 102761769
  • Theoretical Gamma-Dorados instability strip and first comparisons with Corot data
  • The Beta Cephei star HD 180642: Seismic modelling
  • Amplitudes of Solar-like oscillations in Red giants: comparison with an adiabatic scaling law
So we can expect at least one planet from this... a Hot Jupiter.

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Re: CoRoT Results

Post by Lazarus on 16th January 2009, 1:02 pm

Exciting bits in there about using CoRoT to find planets around pulsating stars by timing, both compact stars like sdB stars and around stars such as Delta Scuti variables. If that is possible it might be a way to find planets around massive stars where radial velocity doesn't work so well. There's also some circumbinary planets stuff (both transits and timing variations) and the bit about exchange orbits (analogue of the Janus/Epimetheus configuration) gives an example of another configuration which RV wouldn't do so well at.

Also from "SEARCHING FOR THE MOONS OF EXOPLANETS"...
Direct detection of an exomoon is beyond the capabilities of current instruments, but the motion of a transiting exoplanet could offer a short-cut. In this work [3], we consider the wobble of an exoplanet due to an orbiting moon and conclude that a transiting planet will exhibit two measureable effects: i) mid-transit time variation (TTV) ii) transit duration variation (TDV). We evaluate the magnitude of these observables and demonstrate that CoROT could detect an Earth-like moon around a Neptune-like planet.
(emphasis mine)


Last edited by Lazarus on 23rd January 2009, 4:23 pm; edited 1 time in total
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Re: CoRoT Results

Post by Lazarus on 23rd January 2009, 4:23 pm

According to the exoplanet.org 2009 website, there's an upcoming CoRoT announcement due on 3rd February.

I think they might have something pretty interesting...
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Re: CoRoT Results

Post by Sirius_Alpha on 23rd January 2009, 6:28 pm

Based on...?

I know they have CoRoT-Exo-6 to announce, this seems to be just another Jovian though.

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Re: CoRoT Results

Post by Lazarus on 23rd January 2009, 6:44 pm

Well I might be wrong and the announcement of the "pretty interesting" stuff might be delayed a while further. I'm not saying any more about this until February... I'm not saying any more about stuff which isn't currently up on the CoRoT symposium website until February.
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Re: CoRoT Results

Post by Lazarus on 26th January 2009, 5:26 pm

There is an item with no description titled "The Smallest CoRot Planet" listed on the website... draw your own conclusions from that.
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Re: CoRoT Results

Post by Sirius_Alpha on 26th January 2009, 10:24 pm

Oh yes, that planet again.
Here's a page that may have the light curve of a 1.7 Earth-radius planet.
http://www.obspm.fr/actual/nouvelle/may08/corot.en.shtml

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Re: CoRoT Results

Post by Borislav on 27th January 2009, 7:48 am

embargo


Last edited by Borislav on 27th January 2009, 10:45 am; edited 1 time in total

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Re: CoRoT Results

Post by Sirius_Alpha on 27th January 2009, 9:54 am

Um... embargo breach?

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Re: CoRoT Results

Post by Edasich on 27th January 2009, 10:16 am

Well, Borislav has only said the planetary candidate will be announced in February 3rd, but he said nothing about its mass, orbital period, host star....

Moreover I wonder if Corot-Exo-6b will be announced together 7b.
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Re: CoRoT Results

Post by Borislav on 27th January 2009, 10:45 am

delete my post - embargo

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Re: CoRoT Results

Post by Sirius_Alpha on 29th January 2009, 9:10 pm

CoRoT-Exo-4 paper.


Photospheric activity and rotation of the planet-hosting star CoRoT-Exo-4a
http://arxiv.org/abs/0901.4618

Abstract wrote:The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type main-sequence star (CoRoT-Exo-4a). This planetary system is of particular interest because it has an orbital period of 9.202 days, the second longest one among the transiting planets known to date. We study the surface rotation and the activity of the host star during an uninterrupted sequence of optical observations of 58 days. Our approach is based on a maximum entropy spot modelling technique extensively tested by modelling the variation of the total solar irradiance. It assumes that stellar active regions consist of cool spots and bright faculae, analogous to sunspots and solar photospheric faculae, whose visibility is modulated by stellar rotation. The modelling of the light curve of CoRoT-Exo-4a reveals three main active longitudes with lifetimes between about 30 and 60 days that rotate quasi-synchronously with the orbital motion of the planet. The different rotation rates of the active longitudes are interpreted in terms of surface differential rotation and a lower limit of 0.057 \pm 0.015 is derived for its relative amplitude. The enhancement of activity observed close to the subplanetary longitude suggests a magnetic star-planet interaction, although the short duration of the time series prevents us from drawing definite conclusions.

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Re: CoRoT Results

Post by Lazarus on 2nd February 2009, 4:47 pm

Well apparently the announcement is due tomorrow, anyone know what time?
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Re: CoRoT Results

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