K2 News and Results

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Re: K2 News and Results

Post by Stalker on 21st January 2016, 3:49 pm

I'm part of an association for popular science in France named Planète-Sciences and I am able to pilot the 600mm TJMS telescope of our observatory next to Paris (but havent touched it for half a year Sad ). I received a mail and I'm very proud that amateur astronomers at our observatory have validated a candidate from K2 mission.

The observation was made by Olivier Désormières, jean Michel Vienney and Bruno Dauchet and mandated by Alexandre Santerne. In the mail I received, the star is TYC 1818-1428-1 and the exoplanet is named K2 (9792).

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Re: K2 News and Results

Post by Led_Zep on 21st January 2016, 3:53 pm

Félicitations !!!!!
C'est quel observatoire ?
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Re: K2 News and Results

Post by Stalker on 21st January 2016, 4:08 pm

C'est le centre d'astronomie Jean-Marc Salomon, situé à la base de loisir de Buthiers (we shouldnt talk french here^^)

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Re: K2 News and Results

Post by Shellface on 22nd January 2016, 5:49 pm

Mais, je comprendre (un peu)! "une foule de trois", non?  Smile

Looking at things on planet hunters, this looks like a Hot Jupiter around an early-K dwarf (EPIC 211089792). I remember avoiding looking at it as the target is a close, probably physical binary, so I imagine that's what the ground-based observations were for.

Anyway, congratulations!!

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Re: K2 News and Results

Post by Sirius_Alpha on 28th January 2016, 10:00 pm

EPIC210957318b and EPIC212110888b: two inflated hot-Jupiters around Solar-type stars
http://arxiv.org/abs/1601.07635

EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary
http://arxiv.org/abs/1601.07680

Confirmation of Two Hot Jupiters from K2 Campaign 4
http://arxiv.org/abs/1601.07844

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Re: K2 News and Results

Post by Led_Zep on 29th January 2016, 12:29 pm

Stalker wrote:I'm part of an association for popular science in France named Planète-Sciences and I am able to pilot the 600mm TJMS telescope of our observatory next to Paris (but havent touched it for half a year Sad ). I received a mail and I'm very proud that amateur astronomers at our observatory have validated a candidate from K2 mission.

The observation was made by Olivier Désormières, jean Michel Vienney and Bruno Dauchet and mandated by Alexandre Santerne. In the mail I received, the star is TYC 1818-1428-1 and the exoplanet is named K2 (9792).

http://arxiv.org/abs/1601.07680

EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary

cheers
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Re: K2 News and Results

Post by Lazarus on 30th January 2016, 9:54 am

Congratulations!
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Re: K2 News and Results

Post by Sirius_Alpha on 30th January 2016, 10:03 am

Seconded! Congratulations, Stalker!

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Re: K2 News and Results

Post by Stalker on 1st February 2016, 10:34 am

Sadly i didnt do anything, the congratulations goes to the cited astronomers.

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Re: K2 News and Results

Post by Sirius_Alpha on 1st February 2016, 11:46 pm

The K2-ESPRINT Project IV: A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion
http://arxiv.org/abs/1602.00638

We report on the detection and early characterization of a hot Jupiter in a 3-day orbit around EPIC 212110888, a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in our high-contrast data suggests that the transit-like signals are not due to light variations from such a contaminant star. Our intensive RV measurements show that EPIC 212110888b has a mass of 1.726±0.085MJ, confirming its status as a planet. We also detect the Rossiter-McLaughlin effect for EPIC 212110888b and show that the system has a good spin-orbit alignment (λ=4+11−10 degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2-m telescope reveal a faint companion candidate (ΔmH=6.19±0.11) at a separation of $\sim 0\farcs36$. Follow-up observations are needed to confirm that the companion candidate is physically associated with EPIC 212110888. EPIC 212110888b appears to be an example of a typical ``hot Jupiter,' albeit one which can be precisely characterized using a combination of K2 photometry and ground-based follow-up.

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Re: K2 News and Results

Post by tommi59 on 8th February 2016, 5:26 am

Some mass measurement from K2 mission
http://arxiv.org/pdf/1602.01851.pdf
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Re: K2 News and Results

Post by Led_Zep on 24th February 2016, 2:18 pm

Mc Donald Obs. press release about K2-25b (EPIC 210490365) :

http://mcdonaldobservatory.org/news/releases/20160224
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Re: K2 News and Results

Post by Sirius_Alpha on 3rd March 2016, 7:14 pm

EPIC 206318379 = K2-28
http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=k2-28+b&type=CONFIRMED_PLANET

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Re: K2 News and Results

Post by Led_Zep on 8th March 2016, 3:12 pm

http://arxiv.org/abs/1603.01721

An independent discovery of two hot Jupiters from the K2 mission

We report the discovery of two hot Jupiters using photometry from Campaigns 4 and 5 of the two-wheeled Kepler (K2) mission. EPIC210957318b has a mass of 0.65±0.14MJ, a radius of 1.070±0.018RJ and transits its G dwarf (Teff=5675±50 K), slightly metal rich ([Fe/H]=+0.06±0.04 dex) host star in a 4.1 days circular orbit. EPIC212110888b has a mass of 1.63±0.12MJ, a radius of 1.38±0.014RJ and has an orbital period of 3.0 days in which it orbits a late F dwarf (Teff=6149±55 K) solar metallicity star. Both planets were validated probabilistically and confirmed via precision radial velocity (RV) measurements. They have physical and orbital properties similar to the ones of the already uncovered population of hot Jupiters and are well-suited candidates for further orbital and atmospheric characterization via detailed follow-up observations.
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Re: K2 News and Results

Post by Led_Zep on 9th March 2016, 3:06 pm

http://www.nasa.gov/feature/ames/nasas-k2-mission-the-kepler-space-telescopes-second-chance-to-shine

Press release :

NASA's K2 mission: The Kepler Space Telescope's Second Chance to Shine
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Re: K2 News and Results

Post by Lazarus on 22nd March 2016, 6:11 pm

Adams, Jackson & Endl "Ultra Short Period Planets in K2: SuPerPiG Results for Campaigns 0-5"
http://arxiv.org/abs/1603.06488

Possible hints that the K2 planet population may have different characteristics compared to the Kepler population.
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Re: K2 News and Results

Post by Stalker on 1st April 2016, 4:24 am

Led_Zep wrote:
Stalker wrote:I'm part of an association for popular science in France named Planète-Sciences and I am able to pilot the 600mm TJMS telescope of our observatory next to Paris (but havent touched it for half a year Sad ). I received a mail and I'm very proud that amateur astronomers at our observatory have validated a candidate from K2 mission.

The observation was made by Olivier Désormières, jean Michel Vienney and Bruno Dauchet and mandated by Alexandre Santerne. In the mail I received, the star is TYC 1818-1428-1 and the exoplanet is named K2 (9792).

http://arxiv.org/abs/1601.07680

EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary

cheers

EPIC 9792 is now K2-29b/WASP 152b. Soon in the Astrophysical Journal.

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Re: K2 News and Results

Post by Lazarus on 6th April 2016, 3:59 pm

Mass determinations from RV and TTV for the K2-19 system:

Nespral et al. "Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations"
http://arxiv.org/abs/1604.01265

Fits with an emerging trend that TTV-derived masses are systematically lower than RV-derived masses.
Considering the sparsity of TTV measurements that are supported by RV measurements, this work certainly implies that mass determinations from TTV measurements continue to have to be taken with caution, until a better understanding about the causes that may generate any systematics between RV and TTV derived planet masses is achieved.
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Re: K2 News and Results

Post by Sirius_Alpha on 6th April 2016, 11:53 pm

Doppler Monitoring of five K2 Transiting Planetary Systems
http://arxiv.org/abs/1604.01413

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Re: K2 News and Results

Post by Shellface on 7th April 2016, 11:21 am

Not often that you see a run-on abstract.

There's quite a large discrepancy for the K2-19 results between these papers, which needs some inspection. Looking at the masses:

mb (M)mc (M)
Nespral et al.59.5 ± 9.39.7 ± 3.0
Dai et al.28.5 ± 5.225.6 ± 7.1
(errors have been averaged to symmetry for simplicity)

These disagree with each other by a factor of ~2 in opposite directions, which is quite severe.

I cannot currently do any RV modelling, so for the time being I can only conjecture the cause of this issue. Nespral et al. do not consider the effects of stellar rotational activity, which Dai et al. observe as their most significant signal; they also barely consider planet c in the RVs, which may not be appropriate. Though Dai et al. do treat for the rotational signal, they note that the way in which they do it (cutting the dataset into sections) may not be valid considering the modest ratio between Pc and Prot, which I agree with. This may lead to an overestimate of the semi-amplitude for c.

Barros et al. (2015) give the ratio mc/mb = 0.42 ± 0.12 based on TTVs, which should be accurate as long as gravity works as we think it does. For the above results, mc/mb = 0.16 +0.09-0.07 and 0.90 +0.39-0.35 , respectively. The Nespral et al. value is clearly too small, while the Dai et al. value is too large, to lower precision. This should probably be interpreted as an overestimation of mb by Nespral et al., and an overestimation of mc by Dai et al.

As Dai et al.'s RV dataset is much larger and more precise than Nespral et al.'s, I would suggest that their result is probably the truer of the two. I expect a better result could be reached with improved modelling.

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Re: K2 News and Results

Post by Lazarus on 7th April 2016, 1:28 pm

The discrepancy is even worse when you consider the RV-only solution from the Nespral et al. paper, which gives K=24.8±2.3 m/s and mb = 71.7±6.3 Earth masses.
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Re: K2 News and Results

Post by tommi59 on 8th April 2016, 5:03 am

I personally still waiting for precise mass measurement for Kepler 2-3 planets especially c , d as it looks like d is first confirmed rocky planets in HZ around other star than sun and significant difference in density composition between c and d can confirm threshold between rocky and gassy planets
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Re: K2 News and Results

Post by Led_Zep on 8th April 2016, 6:27 pm

Damned…. Crying or Very sad

http://www.nasa.gov/feature/mission-manager-update-kepler-spacecraft-in-emergency-mode

Mission Manager Update: Kepler spacecraft in emergency mode
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Re: K2 News and Results

Post by Lazarus on 9th April 2016, 9:02 am

Ouch... was looking forward to seeing what K2 could do as regards microlensing... Sad
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Re: K2 News and Results

Post by Lazarus on 11th April 2016, 1:07 pm

Kepler is now recovered and stable.

http://www.nasa.gov/feature/mission-manager-update-kepler-recovered-from-emergency-and-stable

System checks expected for the rest of this week, then hopefully it can begin the microlensing observations.
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Re: K2 News and Results

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