K2 News and Results

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Re: K2 News and Results

Post by Lazarus on 16th March 2018, 3:26 pm

Led_Zep wrote:Sad

https://www.nasa.gov/feature/ames/nasa-s-kepler-spacecraft-nearing-the-end-as-fuel-runs-low

NASA’s Kepler Spacecraft Nearing the End as Fuel Runs Low
All good things...

Still, it's had a pretty good run, no?
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Re: K2 News and Results

Post by Lazarus on 22nd March 2018, 6:29 pm

A sub-Neptune in the 3-billion-year-old open cluster Ruprecht 147.

Curtis et al., "K2-231 b: A sub-Neptune exoplanet transiting a solar twin in Ruprecht 147"
https://arxiv.org/abs/1803.07430
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Re: K2 News and Results

Post by Sirius_Alpha on 26th March 2018, 5:13 pm

K2-229b is a very dense planet in a multiple planet system.

An Earth-sized exoplanet with a Mercury-like composition
https://www.nature.com/articles/s41550-018-0420-5

This tweet thread has more graphics and information.
https://twitter.com/exohugh/status/978308332976066560

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Re: K2 News and Results

Post by Lazarus on 27th March 2018, 4:57 pm

News release about K2-229: http://spaceref.com/extrasolar-planets/newly-discovered-planet-is-hot-metallic-and-dense-as-mercury.html

On a non-exoplanet-related topic, K2 also has been useful for studying Fast-Evolving Luminous Transients, which are identified as supernovae exploding within dust shells: http://spaceref.com/astronomy/kepler-solves-mystery-of-fast-and-furious-explosions.html
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Re: K2 News and Results

Post by Sirius_Alpha on 28th March 2018, 9:23 pm

Sirius_Alpha wrote:EPIC247098361b: a transiting warm Saturn on an eccentric P=11.2 days orbit around a V=9.9 star
https://arxiv.org/abs/1802.08865

Star has received the designation K2-232.

K2-232 b: a transiting warm Saturn on an eccentric P = 11.2 days orbit around a V = 9.9 star
https://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/sty795/4955565?redirectedFrom=fulltext

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Re: K2 News and Results

Post by Edasich on 17th April 2018, 4:58 am

Updates for K2-55 b: A high-density Hot Neptune.

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b

K2-55b is a Neptune-sized planet orbiting a K7 dwarf with a radius of 0.715+0.043−0.040R⊙, a mass of 0.688±0.069M⊙, and an effective temperature of 4300+107−100 K. Having characterized the host star using near-infrared spectra obtained at IRTF/SpeX, we observed a transit of K2-55b with Spitzer/IRAC and confirmed the accuracy of the original K2 ephemeris for future follow-up transit observations. Performing a joint fit to the Spitzer/IRAC and K2 photometry, we found a planet radius of 4.43+0.29−0.32R⊕, an orbital period of 2.8492725+7×10−6−6.6×10−6 days, and an equilibrium temperature of roughly 900K. We then measured the planet mass by acquiring twelve radial velocity (RV) measurements of the system using HIRES on the 10-m Keck I Telescope. Our RV data set precisely constrains the mass of K2-55b to 44.0±5.3M⊕, indicating that K2-55b has a bulk density of 2.8+0.7−0.6 g cm−3 and can be modeled as a rocky planet capped by a modest H/He envelope (Menvelope=12±3%Mp). K2-55b is denser than most similarly sized planets, raising the question of whether the high planetary bulk density of K2-55b could be attributed to the high metallicity of K2-55. The absence of a substantial volatile envelope despite the large mass of K2-55b poses a challenge to current theories of gas giant formation. We posit that K2-55b may have escaped runaway accretion by migration, late formation, or inefficient core accretion or that K2-55b was stripped of its envelope by a late giant impact.
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