HIP 116454 - Transiting sub-Neptune from K2

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HIP 116454 - Transiting sub-Neptune from K2

Post by Led_Zep on 18th December 2014, 12:42 pm

http://spaceref.com/exoplanets/reborn-kepler-makes-first-exoplanet-find-of-new-mission.html

NASA's planet-hunting Kepler spacecraft makes a comeback with the discovery of the first exoplanet found using its new mission -- K2.
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The newly confirmed planet, HIP 116454b, is 2.5 times the diameter of Earth and follows a close, nine-day orbit around a star that is smaller and cooler than our sun, making the planet too hot for life as we know it. HIP 116454b and its star are 180 light-years from Earth, toward the constellation Pisces.
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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by tommi59 on 18th December 2014, 3:25 pm

Density 3.78 g/cm3 and quite close to solar system for possible farther characterisation
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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by Sirius_Alpha on 18th December 2014, 5:42 pm

Where did you get the mass from?

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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by Led_Zep on 19th December 2014, 5:03 am

On arXiv : http://arxiv.org/abs/1412.5674

Characterizing K2 Planet Discoveries: A super-Earth transiting the bright K-dwarf HIP 116454

During the 9 days of observations, K2 observed a single transit event. Using a new K2 photometric analysis technique we are able to correct small telescope drifts and recover the observed transit at high confidence, corresponding to a planetary radius of Rp = 2.53 +/- 0.18 Rearth. Radial velocity observations with the HARPS-N spectrograph reveal a 11.82 +/- 1.33 Mearth planet in a 9.1 day orbit, consistent with the transit depth, duration, and ephemeris
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HIP 116454 - Transiting mini-Neptune from K2

Post by Shellface on 19th December 2014, 4:58 pm

Hey, a white dwarf companion! How many planet hosts with WD companions are there now?

Anyway, the planet seems to be pretty normal. It appears to fall into the group of moderate-insolation mini-neptunes which I suppose HD 97658 b should be the archetype of. Going with the "early TESS" methodology for K2, I expect the mission will discover perhaps a few dozen similar planets around bright stars - like many of the Kepler discoveries, but far easier to maintain observation of.

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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by Sirius_Alpha on 19th December 2014, 9:34 pm

There's also a 45-day signal in the RV data, but they are unable to rule out stellar activity as the cause.

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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by Edasich on 20th December 2014, 4:55 am

Shellface wrote:Hey, a white dwarf companion! How many planet hosts with WD companions are there now?

Especially one hosting a low-mass planet. Most of exoplanet hosts with WD companion are orbited by gas giants, right? What a Face
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Re: HIP 116454 - Transiting sub-Neptune from K2

Post by tommi59 on 20th December 2014, 10:06 am

I dislike name minineptune for planet with density around 4 g/cm3 Evil or Very Mad super earth sounds more nicely Cool
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Re: HIP 116454 - Transiting sub-Neptune from K2

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