K2 News and Results

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K2 News and Results

Post by Led_Zep on 19th April 2015, 8:40 pm

http://arxiv.org/abs/1504.04379

THE K2-ESPRINT PROJECT I: DISCOVERY OF THE DISINTEGRATING ROCKY PLANET
WITH A COMETARY HEAD AND TAIL EPIC 201637175B


We present the discovery of a transiting exoplanet candidate in the K2 Field-1 with an orbital period of 9.1457 hours: EPIC 201637175b. The highly variable transit depths, ranging from ∼0% to 1.3%, are suggestive of a planet that is disintegrating via the emission of dusty effluents. We characterize the host star as anM-dwarf with Teff ≃ 3800. We have obtained ground-based transit measurements with several 1-m class telescopes and with the GTC. These observations (1) improve the transit ephemeris; (2) confirm the variable nature of the transit depths; (3) indicate variations in the transit shapes; and (4) demonstrate clearly that at least on one occasion the transit depths were significantly wavelength dependent. The latter three effects tend to indicate extinction of starlight by dust rather than by any combination of solid bodies. The K2 observations yield a folded light curve with lower time resolution but with substantially better statistical precision compared with the ground-based observations. We detect a significant “bump’ just after the transit egress, and a less significant bump just prior to transit ingress. We interpret these bumps in the context of a planet that is not only likely streaming a dust tail behind it, but also has a more prominent leading dust trail that precedes it. This effect is modeled in terms of dust grains that can escape to beyond the planet’s Hill sphere and effectively undergo ‘Roche lobe overflow’, even though the planet’s surface is likely underfilling its Roche lobe by a factor of 2.
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Re: K2 News and Results

Post by Led_Zep on 15th May 2015, 5:23 pm

http://www.nasa.gov/feature/kepler/ames/kepler-observes-neptune-dance-with-its-moons

KEPLER find two moons around a Neptune !!!
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Re: K2 News and Results

Post by PlutonianEmpire on 15th May 2015, 9:45 pm

Niiiiiiice try. Razz

That's our own Neptune with Triton and Nereid. Wink

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Re: K2 News and Results

Post by jyril on 16th May 2015, 2:22 am

Didn't expect Kepler could detect cold Neptunes... Smile

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Re: K2 News and Results

Post by Lazarus on 16th May 2015, 5:21 am

Does Neptune get a K2 designation now?
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Re: K2 News and Results

Post by Shellface on 16th May 2015, 8:52 am

If you all think that's funny, Earth (and Mars) will probably be observed in campaign 9. I can hear the news headlines from here - "Kepler confirms Earth-like planet bears life"…

In other news, campaign 5 started on the 26th of April, which again includes Praesepe and M67. Get hyped!

Also, Vanderburg et al.'s reduction of the Campaign 2 data has been made public, so we'll surely be seeing a lot of discoveries here, in the direction of Upper Scorpius and Rho Ophiuchi. I'm already seeing candidates over at Planet Hunters.

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Re: K2 News and Results

Post by Sirius_Alpha on 20th May 2015, 4:36 pm

Led_Zep wrote:KEPLER finds two moons around a Neptune!!!
Lazarus wrote:Does Neptune get a K2 designation now?
Laughing
I wonder what level of photometric stability Kepler got for Neptune. I wonder if it might be possible to detect, in transit, some of the "rocks" that orbit closer to the planet. Granted I haven't checked the orbit geometries yet.

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Re: K2 News and Results

Post by Sirius_Alpha on 17th July 2015, 10:33 pm

Several EPIC# stars have been assigned K2-# designations. (No word on Neptune)
http://exoplanetarchive.ipac.caltech.edu./docs/exonews_archive.html#17July2015


EPIC 201367065 = K2-3
EPIC 201208431 = K2-4
EPIC 201338508 = K2-5
EPIC 201384232 = K2-6
EPIC 201393098 = K2-7
EPIC 201445392 = K2-8
EPIC 201465501 = K2-9
EPIC 201577035 = K2-10
EPIC 201596316 = K2-11
EPIC 201613023 = K2-12
EPIC 201629650 = K2-13
EPIC 201635569 = K2-14
EPIC 201736247 = K2-15
EPIC 201754305 = K2-16
EPIC 201855371 = K2-17
EPIC 201912552 = K2-18
EPIC 201505350 = K2-19

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Re: K2 News and Results

Post by tommi59 on 18th July 2015, 2:56 am

K2-9b very interesting object another super earth in HZ around dim M dwarf and K2 -18b minineptune in HZ around M dwarf
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Re: K2 News and Results

Post by tommi59 on 18th July 2015, 3:05 am

K2-19  Two planet system around late G star super neptune and neptune in 2:3 resonance thanks for link sirius
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Re: K2 News and Results

Post by Shellface on 18th July 2015, 9:41 am

These are all from the paper Edasich linked to on page 2, so these are all just from the first campaign of observations! It's no Kepler, and it isn't TESS either, but K2 is looking to be a valuable mission.

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Re: K2 News and Results

Post by Lazarus on 30th July 2015, 2:49 am

EPIC 206011691: two super-Earth planets orbiting an M0 dwarf 65 parsecs away.

Petigura et al. (2015) "Two Transiting Earth-size Planets Near Resonance Orbiting a Nearby Cool Star"
http://arxiv.org/abs/1507.08256

(Not sure radii of 1.59 and 1.92 times Earth really count as "Earth-size", even if you want to be optimistic with the error bars)
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Re: K2 News and Results

Post by Edasich on 30th July 2015, 10:57 am

Both added to EPE:

http://exoplanet.eu/catalog/epic-20601169_b/
http://exoplanet.eu/catalog/epic-20601169_c/

Nevertheless many Kepler and "non-Kepler" exoplanets are still missing in EPE.
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Re: K2 News and Results

Post by Lazarus on 31st July 2015, 12:36 pm

The NASA Exoplanet Archive now has a K2 names table available. HAT-P-56b has received the K2 identifier K2-20b.
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Re: K2 News and Results

Post by tommi59 on 31st July 2015, 3:28 pm

It does not make any sense for me for what HAT-P56b has now name K2-20 b what is purpose ?Maybe I miss something relevant?
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Re: K2 News and Results

Post by Lazarus on 1st August 2015, 5:22 am

This is the K2 naming policy: http://exoplanetarchive.ipac.caltech.edu/docs/K2Numbers.html

Relevant part:
K2 numbers will be assigned to all confirmed or validated planets where K2 data of that object appear in accepted, peer-reviewed journal papers.

The discovery paper for HAT-P-56 incorporates K2 data in the analysis. Therefore according to the K2 names policy, it should receive a K2 designation. (As far as I can tell, it has not been published in the journal yet, so perhaps they've jumped the gun a bit?)
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Re: K2 News and Results

Post by Sirius_Alpha on 1st August 2015, 5:23 am

Probably because HAT-P-56b was observed by K2. Remember that TrES-2 got the designation Kepler-1, HAT-P-7 received the designation Kepler-2, and HAT-P-11 got the designation Kepler-3. Giving  all observed targets a catalogue ID is a matter of convenience.

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Re: K2 News and Results

Post by pochimax on 27th August 2015, 6:45 am

Lazarus wrote:This is the K2 naming policy: http://exoplanetarchive.ipac.caltech.edu/docs/K2Numbers.html

it's a relief, the EPIC naming convention is terrible. but K2-2b etc it is also something confusing, not as good as Kepler initial namings (Kepler-50b and so). Some imagination, pls.
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Re: K2 News and Results

Post by tommi59 on 27th August 2015, 10:30 am

I proposed KSC -kepler second mission nobody agreed Evil or Very Mad
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Re: K2 News and Results

Post by pochimax on 28th August 2015, 4:21 am

KSC- sounds better, for me. What a pity, it was a good idea.
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Re: K2 News and Results

Post by Sirius_Alpha on 30th August 2015, 8:51 pm

K2 data detects starspot modulation (and transits of spots by the planet) and constraints the spin-orbit angle to > 10 degrees.

http://arxiv.org/abs/1508.07281

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Re: K2 News and Results

Post by Led_Zep on 11th September 2015, 6:44 am

http://arxiv.org/abs/1509.02917

A HARPS view on K2-3


K2 space observations recently found that three super-Earths transit the nearby M dwarf K2-3. The apparent brightness and the small physical radius of their host star rank these planets amongst the most favourable for follow-up characterisations. The outer planet orbits close to the inner edge of the habitable zone and might become one of the first exoplanets searched for biomarkers using transmission spectroscopy. We used the HARPS velocimeter to measure the mass of the planets. The mass of planet b is 8.4±2.1 M⊕, while our determination of those planets c and d are affected by the stellar activity. With a density of 4.32+2.0−0.76 gcm−3, planet b is probably mostly rocky, but it could contain up to 50% water
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Re: K2 News and Results

Post by tommi59 on 11th September 2015, 6:45 am

http://arxiv.org/pdf/1509.02917v1.pdf
Interesting results small RV data of planetary system K2-3 containing probably 4 planets.Despite stellar activity affecting rv measurement it looks like is surprisingly big difference in densities between planet b  c and d .especially c and d.Fourth planet has period around 100 days I am very curious if is transiting
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Re: K2 News and Results

Post by tommi59 on 11th September 2015, 7:19 am

Should not planet b have density higher? around 5.32 g/cm3 ? Kepler 48 d has almost identical radius  and mass smaller about 5.5% and has density 5.08 g/cm 3 ? Or I am wrong
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Re: K2 News and Results

Post by matthew27 on 19th September 2015, 9:51 pm

up to 24 planets for k2!


Two new K2 confirmed planets! K2-21 b http://goo.gl/QTJ9IP & K2-21 c http://goo.gl/q26sli


Discoveries from the prime Kepler mission demonstrated that small planets (< 3 Earth-radii) are common outcomes of planet formation. While Kepler detected many such planets, all but a handful orbit faint, distant stars and are not amenable to precise follow up measurements. Here, we report the discovery of two small planets transiting K2-21, a bright (K = 9.4) M0 dwarf located 65$\pm$6 pc from Earth. We detected the transiting planets in photometry collected during Campaign 3 of NASA's K2 mission. Analysis of transit light curves reveals that the planets have small radii compared to their host star, 2.60 $\pm$ 0.14% and 3.15 $\pm$ 0.20%, respectively. We obtained follow up NIR spectroscopy of K2-21 to constrain host star properties, which imply planet sizes of 1.59 $\pm$ 0.43 Earth-radii and 1.92 $\pm$ 0.53 Earth-radii, respectively, straddling the boundary between high-density, rocky planets and low-density planets with thick gaseous envelopes. The planets have orbital periods of 9.32414 days and 15.50120 days, respectively, and have a period ratio of 1.6624, very near to the 5:3 mean motion resonance, which may be a record of the system's formation history. Transit timing variations (TTVs) due to gravitational interactions between the planets may be detectable using ground-based telescopes. Finally, this system offers a convenient laboratory for studying the bulk composition and atmospheric properties of small planets with low equilibrium temperatures.

Two Transiting Earth-size Planets Near Resonance Orbiting a Nearby Cool Star

http://arxiv.org/pdf/1507.08256v2.pdf

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