NGTS Results

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NGTS Results

Post by Sirius_Alpha on 30th October 2017, 9:05 pm

A hot Jupiter around an M dwarf makes its debut as the NGTS's first extrasolar planet discovery!

NGTS-1b: A hot Jupiter transiting an M-dwarf
https://arxiv.org/abs/1710.11099

We present the discovery of NGTS-1b, a hot-Jupiter transiting an early M-dwarf host (Teff=3916+71−63 K) in a P=2.674d orbit discovered as part of the Next Generation Transit Survey (NGTS). The planet has a mass of 0.812+0.066−0.075 MJ, making it the most massive planet ever discovered transiting an M-dwarf. The radius of the planet is 1.33+0.61−0.33 RJ. Since the transit is grazing, we determine this radius by modelling the data and placing a prior on the density from the population of known gas giant planets. NGTS-1b is the third transiting giant planet found around an M-dwarf, reinforcing the notion that close-in gas giants can form and migrate similar to the known population of hot Jupiters around solar type stars. The host star shows no signs of activity, and the kinematics hint at the star being from the thick disk population. With a deep (2.5%) transit around a K=11.9 host, NGTS-1b will be a strong candidate to probe giant planet composition around M-dwarfs via JWST transmission spectroscopy.

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Re: NGTS Results

Post by Lazarus on 31st October 2017, 4:56 am

There's also a paper up describing the details of NGTS

Wheatley et al. "The Next Generation Transit Survey (NGTS)"
https://arxiv.org/abs/1710.11100
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Re: NGTS Results

Post by Led_Zep on 31st October 2017, 3:53 pm

Two links about NGTS-1b :

https://warwick.ac.uk/newsandevents/pressreleases/monster_planet_discovery/
Monster’ planet discovery challenges formation theory


http://www.eso.org/public/announcements/ann17076/
New Exoplanet Survey Finds its First Planet
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Re: NGTS Results

Post by Edasich on 1st November 2017, 10:16 am

I remember similar transiting objects detected long time ago, SWEEPS-02 b, SWEEPS-10 b and SWEEPS-15 b (no mass estimate though, radius only), some with ultrashort orbital period (e.g. SWEEPS-10 b, 0.424 days). Discovery dates back 2006 but as far as I know there hasn't been any update since, neither confirmation or disproval.
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Re: NGTS Results

Post by Lazarus on 1st November 2017, 7:52 pm

It's pretty unlikely that there will be any follow-up on the SWEEPS candidates, the distance makes observations difficult and there is more value in observing nearer systems which are more amenable for transit spectroscopy etc.
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