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  #181 (permalink)  
Old 13-December-2007, 03:35 PM
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How many exoplanets would you guess CoRoT might introduce? [I want 4. ]
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  #182 (permalink)  
Old 15-December-2007, 07:44 PM
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And now for something completely different:
  • GD 66b, the first extrasolar planet around a white dwarf (m = 2.11 MJ, a = 2.356 AU, p = 1650 d, e = 0).
The discovery was based on the timing of stellar oscillations. Yet another method based on the Doppler effect.
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  #183 (permalink)  
Old 15-December-2007, 08:06 PM
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Quote:
Originally Posted by Kullat Nunu View Post
And now for something completely different:
  • GD 66b, the first extrasolar planet around a white dwarf (m = 2.11 MJ, a = 2.356 AU, p = 1650 d, e = 0).
The discovery was based on the timing of stellar oscillations. Yet another method based on the Doppler effect.
That's cool. Here's Fergal Mullally and team's, power point presentation. It shows how the orbital inclination is obtainable, too. [I like the more appropriate blue color for the white dwarf, too. ]
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  #184 (permalink)  
Old 02-January-2008, 09:01 PM
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Originally Posted by George View Post
How many exoplanets would you guess CoRoT might introduce? [I want 4. ]
You got one.

A hot Jupiter, but not as typical as it seems. It is unusually massive (3.53 MJ) for such a large planet (1.429 RJ).

Let's hope the CoRoT team gets lots of observation time to conduct RV confirmations...
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Old 02-January-2008, 09:04 PM
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Now this is interesting... a 8-10 million years old hot Jupiter around the low-mass star TW Hydrae (Space.com article). The system is so young that the protoplanetary disk has not yet evaporated. Youngest planetary system by the factor of over 10.
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Old 03-January-2008, 03:43 AM
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Originally Posted by Kullat Nunu View Post
You got one.
So much for my simplified extrapolation. It predicted 62 exoplanet discoveries for 2007, and we only had 61.

Quote:
Now this is interesting... a 8-10 million years old hot Jupiter around the low-mass star TW Hydrae (Space.com article). The system is so young that the protoplanetary disk has not yet evaporated. Youngest planetary system by the factor of over 10.
Another Wow moment! I wonder if it is migrating.
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  #187 (permalink)  
Old 03-January-2008, 06:33 AM
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Another Wow moment! I wonder if it is migrating.
Looks like it's already migrated. It orbits ten times closer than Mercury's distance from the sun.
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  #188 (permalink)  
Old 03-January-2008, 12:16 PM
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Yes, and there is evidence it has partially cleared the protoplanetary disk in the process. The discovery of TW Hya b is a major one.

It is also good to know that the mass 9.8 MJ is the actual mass of the planet, based on the reasonable assumption that the planet orbits at the same plane as the protoplanetary disk. The inclination of the disk is 7°, which means we see it almost face-on.
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  #189 (permalink)  
Old 03-January-2008, 02:15 PM
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I am curious if there is still enough disk remaining to degrade its orbit, or if there is enough T-Tauri like tantrums that would cause migration, or both. At such an early age for the system, perhaps migration is likely.

[V838 Mon comes to mind ever since Cress et. al. proposed, in their paper, the idea that the flashes (light echos) may have been caused by planetary plunges into the star.]
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  #190 (permalink)  
Old 04-January-2008, 08:26 PM
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Maybe it didn't migrate at all or very little.
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  #191 (permalink)  
Old 04-January-2008, 09:22 PM
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Yes, that would seem possible.

If it is migrating, could we not detect it over a few year span?
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"The mean of five measures each of which is not worth a dang (sinc), has a maximum value of only five dangs (sinc)". Heber Curtis

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  #192 (permalink)  
Old 05-January-2008, 05:21 AM
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Maybe it didn't migrate at all or very little.
Current scientific thinking is that it is impossible for a gas giant to form so class to its star. As for seeing it migrate, I'm pretty sure that migrations takes a long time by human standards.
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  #193 (permalink)  
Old 05-January-2008, 07:24 PM
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Current scientific thinking is that it is impossible for a gas giant to form so class to its star. As for seeing it migrate, I'm pretty sure that migrations takes a long time by human standards.
A decaded ago, before the extrasolar planets were discovered, then current scientific thinking said all gas giants should be outside the ice line and movies like Star Wars, which had a gas giant inside the life zone, was mere fantasy...

I'd hold off on this scientific thinking and wonder just how biased we are.
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  #194 (permalink)  
Old 05-January-2008, 08:33 PM
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Quote:
...then current scientific thinking said all gas giants should be outside the ice line...
The only difference between then and now is that we've discovered that planets can and do migrate. There is still good reason to think that giants form outside the "ice line".
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  #195 (permalink)  
Old 05-January-2008, 10:22 PM
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The only difference between then and now is that we've discovered that planets can and do migrate. There is still good reason to think that giants form outside the "ice line".
How true Yogi's malaprop, "you can see a lot by just looking". The bigger the scopes, the bigger the looks, then we'll see!
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  #196 (permalink)  
Old 07-January-2008, 03:58 PM
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Seems as if I read this a while back, but it's dated today. Apologies if it's shown up already - couldn't find the instance if so:

Exoplanet reflected light detected for the first time

Quote:
The ability to explore remote worlds in space has been enhanced through a polarization technique that allows the first ever detection of light reflected by extrasolar (exoplanet) planets. The study has been accepted for publication in Astrophysical Journal Letters.

An international team of astronomers, led by Professor Svetlana Berdyugina of ETH Zurich's Institute of Astronomy, has for the first time ever been able to detect and monitor the visible light that is scattered in the atmosphere of an exoplanet. Employing techniques similar to how Polaroid sunglasses filter away reflected sunlight to reduce glare, the team of scientists were able to extract polarized light to enhance the faint reflected starlight 'glare' from an exoplanet. As a result, the scientists could infer the size of its swollen atmosphere. They also directly traced the orbit of the planet, a feat of visualization not possible using indirect methods.
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  #197 (permalink)  
Old 09-January-2008, 06:54 PM
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USA Today: Faraway planets collided, merged into one (from Space.com)

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An extrasolar planet about one-fourth the heft of Jupiter might have formed from the collision and merger of two planets, astronomers announced.
Known as 2M1207B, the object orbits a brown-dwarf star called 2M1207A located 170 light-years from Earth and seen in the direction of the constellation Centaurus.

Astronomers have long puzzled over the mysterious object, which seems to fall outside the spectrum of physical possibility. Its temperature, age and brightness don't match up with what astrophysical theory would predict.
Horse's mouth: CfA press release: When Worlds Collide: Have Astronomers Observed the Aftermath of a Distant Planetary Collision?

Here's an artist's concept, but won't someone please make the CG animation of this?

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  #198 (permalink)  
Old 09-January-2008, 07:05 PM
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Man, 20 yrs ago, exoplanets were all in the province of sci-fi. Now, we're finding new worlds on a semi-regular basis. How long will it be till we snap a photo of some alien planet, and catch a glint of light off SOMEBODY ELSE'S camera lens?
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  #199 (permalink)  
Old 09-January-2008, 07:23 PM
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How long will it be till we snap a photo of some alien planet, and catch a glint of light off SOMEBODY ELSE'S camera lens?
That will take a very long time. I would guess thousands of years.
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  #200 (permalink)  
Old 09-January-2008, 10:54 PM
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...or our understanding of very low-mass objects such as this is incomplete.
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  #201 (permalink)  
Old 09-January-2008, 11:04 PM
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University of Arizona press release: Astronomers are First to Successfully Predict Extra-Solar Planet

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Astronomers, including one at The University of Arizona, have successfully predicted the existence of an unknown planet, the first since Neptune was predicted in the 1840s. This planet, however, is outside our own solar system, circling a star a little more than 200 light years from Earth.

The UA's Rory Barnes and his associates predicted the unknown planet from their theoretical study of the orbits of two planets known to orbit star HD 74156.
[...]
[Barnes] and his colleagues studied the orbits of several planetary systems and found that planets’ orbits tend to be packed as closely together as possible without gravity destabilizing their orbits. They reasoned that this tight packing resulted from universal processes of planetary formation.

But the two planets, named “B” and “C”, orbiting the star HD 74156 had a big gap between them. They concluded that if their “Packed Planetary Systems” hypothesis was correct, then there must be another planet between planets B and C, and it must be in a particular orbit.
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Old 09-January-2008, 11:19 PM
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Accounting for velocity jitters in planet search surveys (arXiv.org, submitted on 22 Dec 2007)

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The role of radial velocity (RV) jitters in extrasolar planet search surveys is discussed. Based on the maximum-likelihood principle, improved statistical algorithms for RV fitting and period search are developed. These algorithms incorporate a built-in jitter determination, so that resulting estimations of planetary parameters account for this jitter automatically. This approach is applied to RV data for several extrasolar planetary systems. It is shown that many RV planet search surveys suffer from periodic systematic errors which increase effective RV jitters and can lead to erratious conclusions. For instance, the planet candidate HD74156 d may be a false detection made due to annual systematic errors.
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Old 10-January-2008, 08:16 PM
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Not a new planet, just a program.

University of Florida News: UF-led search for new planets part of ambitious new sky survey

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A University of Florida-led sky survey that may double the number of known planets outside the solar system is part of a major new survey program announced today at the American Astronomical Society’s annual meeting in Austin, Texas.

The Sloan Digital Sky Survey III, slated to begin mid-year and end in mid-2014, consists of four independent surveys operated by the survey’s consortium. One will probe the distant universe and seek to learn more about mysterious dark energy, while two of the surveys will map the Milky Way and examine origins of stars. The UF-led survey will seek to find giant planets orbiting nearby stars and uncover more about the conditions in which they form.

“What we’re undertaking here is the largest homogeneous survey of planets ever conducted,” said Jian Ge, a UF professor of astronomy and the project’s principal investigator. “We not only want to find more planets, we also want to try to understand the big picture of how and where they form and evolve over time.”
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  #204 (permalink)  
Old 14-February-2008, 07:36 PM
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The drought ends with a bang...
  • OGLE-2006-BLG-109Lbc, the first double planet system detected using the gravitational lensing method. Orbital and physical parameters of the two planets resemble Jupiter and Saturn. Both are slightly smaller and closer to their star, but because the star is much dimmer than the Sun, the planets have temperatures similar to our familiar gas giants. Maybe not a coincidence.
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Old 15-February-2008, 10:25 PM
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Default NYTimes story on latest OGLE finding

The Times had a fairly good writeup of the latest OGLE results:
Quote:
Smaller Version of the Solar System Is Discovered

By DENNIS OVERBYE
Published: February 15, 2008

Astronomers said Wednesday that they had found a miniature version of our own solar system 5,000 light-years across the galaxy — the first planetary system that really looks like our own, with outer giant planets and room for smaller inner planets.

“It looks like a scale model of our solar system,” said Scott Gaudi, an assistant professor of astronomy at Ohio State University. Dr. Gaudi led an international team of 69 professional and amateur astronomers who announced the discovery in a news conference with reporters.
Their results are being published Friday in the journal Science. The discovery, they said, means that our solar system may be more typical of planetary systems across the universe than had been thought.
http://www.nytimes.com/2008/02/15/sc...15planets.html
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  #206 (permalink)  
Old 20-February-2008, 06:42 PM
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Three new planets around orange K giant stars:They all are massive, 2.7 - 10.3 times as massive as Jupiter, and they all orbit in circular, medium-distance orbits between 0.68 AU and 2.8 AU. The stars they orbit are medium-mass, 2.1 - 2.3 times as massive as the Sun. Planets around such stars don't seem to be rare¹, but it seems that if there are short orbit planets, they're exceedingly rare. Of course, a true "hot Jupiter" analog would be consumed when its parent star expands; still, there's plenty of room unoccupied.

¹ Note that all medium-mass stars that are known to have planets are orange giants, which is a stable period in the life of such stars. When they're younger like Sirius, the radial velocity method can't be used because the stars tend to rotate fast which blur spectral lines.
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Old 29-February-2008, 09:14 PM
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I can't wait until the Esa's Darwin and Nasa's Kepler are going operational. A totaly new world will open I think. There are most likely billions of exoplanets. And a number of them will orbit in the habitable zone.
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Old 01-March-2008, 12:14 AM
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Kepler will be extremely welcome indeed, but I wouldn't get too excited about Darwin just yet, if I were you. As things stand, it's shaping up to be a very long wait.
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Old 01-March-2008, 09:46 AM
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Update
Nearest star's wobbles could reveal Earth's twin
05:08 29 February 2008
NewScientist.com news service
Stephen Battersby
European planet hunters on brink of Earth-sized prize
Alpha Centauri lies just over 4 light years away and is the closest star system to the Sun. It appears to be a triple system, with two Sun-like stars orbiting each other relatively closely (about 23 times the Earth-Sun distance). The two stars have high concentrations of heavy elements, which is characteristic of stars that are born surrounded by dusty, planet-forming discs.

From:http://space.newscientist.com/articl...rths-twin.html
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Old 07-March-2008, 10:04 AM
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A new transiting planet:
  • HAT-7b: An extremely hot massive planet transiting a bright star in the Kepler field.

The abstract says that the planet's dayside temperature should be about 2700 K. That is hot.
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