Kepler Mission |
Kepler Mission |
Jan 4 2010, 01:55 AM
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#406
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Article titled "The Big Reveal"?
I dunno, man. I've personally framed Kepler's primary science return as a statistical sampling that'll give us a degree of insight into the frequency of occurrence of planetary systems (within some major constraints such as orbital plane alignment with Earth & relatively small orbital radii for observed objects, of course.) That's gonna take time. This might be a cool one-off early discovery of some sort...but I hope the team isn't setting itself up for later PR problems by elevating expectations beyond what is reasonable & prudent. We've seen that happen before. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jan 4 2010, 02:09 PM
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#407
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Senior Member Group: Members Posts: 1422 Joined: 26-July 08 Member No.: 4270 |
Five new exoplanets. 4 are larger than Jupiter. 1 is Neptune-sized. The relevant presentation just ended. 100 candidate planets in Kepler data so far. Thousands of candidate variable stars. Sub-stellar sized stars were expected to be prohibitively variable, but it didn't turn out to be that bad. Exoplanet sizes: 4 R_e, 15 R_e, 17 R_e, 19 R_e.
Kepler naming scheme. 4b, 5b, 6b 7b, 8b. (3 planets alreay in field, so it's respect to those scientists). Kepler-8 b Rossiter-McLaughlin effect measured. Prograde. Kepler-4 b -> The Neptune. Kepler-7 b very low density planet. http://www.starstryder.com/2010/01/04/kepler-first-science/ We're told to expect something on arXiv. -------------------- -- Hungry4info (Sirius_Alpha)
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Jan 4 2010, 05:12 PM
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#408
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Junior Member Group: Members Posts: 87 Joined: 9-November 07 Member No.: 3958 |
Live blog from AAS: hot Jupiters and hot but icy giants, plus more than one case of a "planet" that has to be hotter than its star (and which doesn't fit as either a degenerate or main-sequence star). Sounds of discovery: "Hmm - that's funny...
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Jan 4 2010, 05:14 PM
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#409
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
Nice link. Interesting how much that person looks like you. :-) [You meaning Hungry, not NGC]
I'll be interested to hear what they make of the super hot Jupiters -- the ones significantly brighter than the stars they orbit. Deuterium burning was my first thought, but I thought I read that that phase doesn't last very long. --Greg |
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Guest_Zvezdichko_* |
Jan 4 2010, 06:05 PM
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#410
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Guests |
http://kepler.nasa.gov/Mission/tableofdiscoveries/
A very useful table. Just look at the orbital period - all planets have orbital periods between 3 and 4 days. And the surface temperature is very high EDIT : Another link! http://www.nasa.gov/mission_pages/kepler/n...exoplanets.html |
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Jan 4 2010, 06:25 PM
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#411
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Member Group: Members Posts: 131 Joined: 31-May 08 From: San Carlos, California, USA Member No.: 4168 |
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Jan 4 2010, 06:48 PM
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#412
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Member Group: Members Posts: 131 Joined: 31-May 08 From: San Carlos, California, USA Member No.: 4168 |
Check out this slide:
http://www.nasa.gov/images/content/414914m...discoveries.jpg It puts the newly discovered planets in a familiar context. It says all five planets were discovered from the first 43 days of data. Kepler has been observing for, what, 300 days at this point? Also, irks me that it pins "habitable" as requiring the same orbital distance as Earth. An orbital distance of 1 AU is neither necessary nor sufficient for habitability. We'll find plenty of non-habitable planets at 1 AU, and we'll also find plenty of habitable planets outside 1 AU. |
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Guest_Zvezdichko_* |
Jan 4 2010, 07:27 PM
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#413
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Guests |
With no fear of being a false prophet - I predict that this data will be analyzed for several decades at least.
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Jan 4 2010, 08:30 PM
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#414
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
"It says all five planets were discovered from the first 43 days of data. Kepler has been observing for, what, 300 days at this point?"
It's the confirmation by ground-based radial velocity measurements that takes most of the time. |
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Jan 4 2010, 10:12 PM
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#415
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Liking those slides. Very high quality.
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Jan 4 2010, 10:20 PM
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#416
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Member Group: Members Posts: 131 Joined: 31-May 08 From: San Carlos, California, USA Member No.: 4168 |
It's the confirmation by ground-based radial velocity measurements that takes most of the time. Rightfully so. I should have been more clear. My comment was intended to note that the discoveries presented today are just the first bushel load from a fruit tree ripe for the plucking. |
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Jan 5 2010, 01:23 AM
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#417
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Member Group: Members Posts: 105 Joined: 27-August 05 Member No.: 479 |
Nice link. Interesting how much that person looks like you. :-) [You meaning Hungry, not NGC] I'll be interested to hear what they make of the super hot Jupiters -- the ones significantly brighter than the stars they orbit. Deuterium burning was my first thought, but I thought I read that that phase doesn't last very long. --Greg its my understanding that first discovery will be planets close in.perhaps super Jupiter's with exomoons close in towards there red dwarf primary's might be next.lastly planets with orbital periods of one year or more might become known to us near the end of mission. edit ooops was trying to quote Zvezdichko post from the previous page |
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Jan 5 2010, 06:09 AM
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#418
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
There are lots of Kepler-related papers on ArXiv today
http://arxiv.org/list/astro-ph.EP/recent |
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Jan 5 2010, 07:49 PM
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#419
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Member Group: Members Posts: 131 Joined: 31-May 08 From: San Carlos, California, USA Member No.: 4168 |
Thank you for the link Paolo. There goes the rest of my day .
"The Kepler Follow-up Observation Program" http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.0352v1.pdf CODE Total KOIs 177 From targets mkepler <= 15 in quarters 0 and 1 Type Number Planet 5 Good rv orbit matches light curve. Possible planet 52 Radial velocity variation is small enough for a planetary mass companion. Recon 65 Still under reconnaissance. No type assigned. Double lined spectrum 5 Stellar companion 8 RV variations indicate a stellar mass companion. Triple system 1 Transit source is in a triple (or greater) system. Background eclipsing binary 11 Fast rotator 13 Star is rotating too fast for very precise velocities. Withdrawn 14 Withdrawn by TCERT after re-examination of light curve Unsuitable 3 Featureless spectrum unsuitable for RV work or no star apparent at target location Quarters 0 and 1 must be the first 43 days of returned data. |
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Jan 5 2010, 09:09 PM
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#420
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Junior Member Group: Members Posts: 60 Joined: 3-January 09 Member No.: 4520 |
Yeah, definitely some fascinating reading in here. Thanks Paolo.
Q0/Q1 is defined as "Q0 consisting of 9.7 days of data taken during commissioning and Q1 consisting of 33.5 days of data taken before the first quarterly roll of the spacecraft" in this summary paper: http://arxiv.org/abs/1001.0268 Good overview on oscillating, pulsating, and eclipsing stars in that one too. Another interesting paper is the one where they model the star as a triaxial ellipsoid shape (think "like Haumea") in order to nail down the light curve better: http://arxiv.org/abs/1001.0413 |
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