K2 News and Results

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Re: K2 News and Results

Post by Sirius_Alpha on 6th September 2018, 8:36 pm

The two-planet Praesepe system reported here is independently confirmed.

EPIC 211964830: A transiting multi-planet system in the Praesepe open cluster
https://arxiv.org/abs/1809.01968

Also, apparently the safe-mode earlier was triggered by a bad thruster.  Kepler is back in science mode, though who knows for how much longer.
https://spacenews.com/kepler-resumes-operations-despite-malfunctioning-thruster/

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Re: K2 News and Results

Post by Sirius_Alpha on 24th September 2018, 9:28 pm

A couple new Kepler-K2 transiting planets.

K2-265 b: A Transiting Rocky Super-Earth
https://arxiv.org/abs/1809.08869

EPIC 249451861b: an Eccentric Warm Saturn transiting a G-dwarf
https://arxiv.org/abs/1809.08879

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Re: K2 News and Results

Post by Led_Zep on 1st October 2018, 2:19 pm

Crying or Very sad Crying or Very sad Crying or Very sad

https://www.nasa.gov/feature/ames/kepler-put-into-sleep-mode-as-telescope-s-pointing-performance-degrades

Sept. 28, 2018

Kepler Put Into Sleep Mode As Telescope’s Pointing Performance Degrades

NASA’s Kepler team has received data showing that the spacecraft’s ability to point precisely has degraded. In order to preserve high-value science data collected during its latest observation campaign, the Kepler team has placed the spacecraft in a stable, no-fuel-use sleep mode.
During Kepler’s allotted Deep Space Network time, scheduled to begin October 10, the Kepler team will “wake up” the spacecraft and direct it to point its large antenna back to Earth and transmit the science data home. Due to uncertainties about the remaining available fuel, there is no guarantee that NASA will be able to download the science data. If successful the Kepler team will attempt to start the next observing campaign with the remaining fuel.

EDIT : (Twitter)

Natalie Batalha‏ @nbatalha · 3 minil y a 3 minutes
Kepler Put Into Sleep Mode As Telescope’s Pointing Performance Degrades (but spends 27 days observing TRAPPIST-1 first!!)

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Re: K2 News and Results

Post by Sirius_Alpha on 9th October 2018, 8:35 pm

60 Validated Planets from K2 Campaigns 5-8
https://arxiv.org/abs/1810.04074

We present a uniform analysis of 155 candidates from the second year of NASA's K2 mission (Campaigns 5 - 8 ), yielding 60 statistically validated planets spanning a range of properties, with median values of Rp = 2.5 R⊕, P = 7.1 d, Teq = 811 K, and J = 11.3 mag. The sample includes 24 planets in 11 multi-planetary systems, as well as 18 false positives, and 77 remaining planet candidates. Of particular interest are 18 planets smaller than 2 R⊕, five orbiting stars brighter than J = 10 mag, and a system of four small planets orbiting the solar-type star EPIC 212157262. We compute planetary transit parameters and false positive probabilities using a robust statistical framework and present a complete analysis incorporating the results of an intensive campaign of high resolution imaging and spectroscopic observations. This work brings the K2 yield to over 360 planets, and by extrapolation we expect that K2 will have discovered ∼600 planets before the expected depletion of its on-board fuel in late 2018.

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Re: K2 News and Results

Post by Sirius_Alpha on 10th October 2018, 8:42 pm

K2-140b and K2-180b -- Characterization of a hot Jupiter and a mini-Neptune from the K2 mission
https://arxiv.org/abs/1810.04601

We report the independent discovery and characterization of two \ktwo\ planets: K2-180b, a mini-Neptune-size planet in an 8.9-day orbit transiting a V\,=\,12.6\,mag, metal-poor ([Fe/H]\,=\,−0.65±0.10) K2V star in \ktwo\ campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-day orbit around a V\,=\,12.6\,mag G6V ([Fe/H]\,=\,+0.10±0.10) star in \ktwo\ campaign 10. Our results are based on \ktwo\ time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp=11.3±1.9\,\Mearth\ and a radius of Rp=2.2±0.1\,\Rearth, yielding a mean density of ρp=5.6±1.9\,\gcm, suggesting a rock composition. Given its radius, K2-180b is above the region of the so-called ``planetary radius gap''. K2-180b is in addition not only one of the densest mini-Neptune-size planets, but also one of the few mini-Neptune-size planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

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Re: K2 News and Results

Post by Sirius_Alpha on 11th October 2018, 8:35 pm

Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES
https://arxiv.org/abs/1810.04731

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Re: K2 News and Results

Post by Led_Zep on 11th October 2018, 10:42 pm

cheers Twitter :

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Re: K2 News and Results

Post by Lazarus on 26th November 2018, 2:44 pm

Cortes et al. "Search for Exoplanetary Transits in the Galactic Bulge"
https://arxiv.org/abs/1811.09174

It's not clear to me which of these are actually in the Galactic Bulge. EPIC 224439122 is in NGC 6530, the open cluster within the Lagoon Nebula so could have some interesting views there. Unfortunately they don't give the Gaia DR2 identifiers or the parallaxes, despite discussing the use of Gaia data.
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