KELT Results

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KELT Results

Post by Sirius_Alpha on 10th June 2012, 8:22 pm

KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
http://arxiv.org/abs/1206.1635

We present the discovery of KELT-1b, the first transiting low-mass companion from the wide-field Kilodegree Extremely Little Telescope-North (KELT-North) survey. The V=10.7 primary is a mildly evolved, solar-metallicity, mid-F star. The companion is a low-mass brown dwarf or super-massive planet with mass of 27.23+/-0.50 MJ and radius of 1.110+0.037-0.024 RJ, on a very short period (P=1.21750007) circular orbit. KELT-1b receives a large amount of stellar insolation, with an equilibrium temperature assuming zero albedo and perfect redistribution of 2422 K. Upper limits on the secondary eclipse depth indicate that either the companion must have a non-zero albedo, or it must experience some energy redistribution. Comparison with standard evolutionary models for brown dwarfs suggests that the radius of KELT-1b is significantly inflated. Adaptive optics imaging reveals a candidate stellar companion to KELT-1, which is consistent with an M dwarf if bound. The projected spin-orbit alignment angle is consistent with zero stellar obliquity, and the vsini of the primary is consistent with tidal synchronization. Given the extreme parameters of the KELT-1 system, we expect it to provide an important testbed for theories of the emplacement and evolution of short-period companions, and theories of tidal dissipation and irradiated brown dwarf atmospheres.

KELT-2Ab: A Hot Jupiter Transiting the Bright (V=8.77) Primary Star of a Binary System
http://arxiv.org/abs/1206.1592

We report the discovery of KELT-2Ab, a hot Jupiter transiting the bright (V=8.77) primary star of the HD 42176 binary system. The host is a slightly evolved late F-star likely in the very short-lived "blue-hook" stage of evolution, with $\teff=6151\pm50{\rm K}$, $\log{g_*}=4.030_{-0.028}^{+0.013}$ and $\feh=-0.018\pm0.069$. The inferred stellar mass is $M_*=1.308_{-0.025}^{+0.028}$\msun\ and the star has a relatively large radius of $R_*=1.828_{-0.034}^{+0.070}$\rsun. The planet is a typical hot Jupiter with period $4.113791\pm0.00001$ days and a mass of $M_P=1.522\pm0.078$\mj\ and radius of $R_P=1.286_{-0.047}^{+0.065}$\rj. This is mildly inflated as compared to models of irradiated giant planets at the $\sim$4 Gyr age of the system. KELT-2A is the third brightest star with a transiting planet identified by ground-based transit surveys, and the ninth brightest star overall with a transiting planet. KELT-2Ab's mass and radius are unique among the subset of planets with $V<9$ host stars, and therefore increases the diversity of bright benchmark systems. We also measure the relative motion of KELT-2A and -2B over a baseline of 38 years, robustly demonstrating for the first time that the stars are bound. This allows us to infer that KELT-2B is an early K dwarf. We hypothesize that through the eccentric Kozai mechanism KELT-2B may have emplaced KELT-2Ab in its current orbit. This scenario is potentially testable with Rossiter-McLaughlin measurements, which should have an amplitude of $\sim$44 m s$^{-1}$.

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Re: KELT Results

Post by jyril on 13th June 2012, 2:22 pm

'Extremely little' telescope discovers pair of odd planets

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Re: KELT Results

Post by Lazarus on 13th June 2012, 3:59 pm

Interesting that KELT-1b falls in the "driest" part of the brown dwarf desert. The authors remain agnostic about the superplanet/brown dwarf categorisation for this object. (It doesn't make the EPE categorisation however so it isn't listed there.)


Last edited by Lazarus on 4th April 2013, 4:45 pm; edited 1 time in total
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Re: KELT Results

Post by Sirius_Alpha on 3rd July 2012, 9:07 pm

Nice public outreach video.
http://www.youtube.com/watch?v=wVS8lnkXXlE

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Re: KELT Results

Post by Sirius_Alpha on 6th November 2012, 9:13 pm

KELT-3b: A Hot Jupiter Transiting a V=9.8 Late-F Star
http://arxiv.org/abs/1211.1031

We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with a mass of 1.462 (+0.067, -0.066) M_J, and radius of 1.358 (+0.068, -0.069) R_J, with an orbital period of 2.703390 +/- 0.000010 days. The host star, KELT-3, is a V=9.8 late F star with M_* = 1.282 (+0.062, -0.060) M_sun, R_* = 1.482 (+0.062, -0.064) R_sun, T_eff = 6304 +/- 49 K, log(g) = 4.204 (+0.031, -0.029), and [Fe/H] = 0.048 (+0.079, -0.081), and has a likely proper motion companion. KELT-3b is the third transiting exoplanet discovered by the KELT survey, and is orbiting one of the 20 brightest known transiting planet host stars, making it a promising candidate for detailed characterization studies. Although we infer that KELT-3 is significantly evolved, a preliminary analysis of the stellar and orbital evolution of the system suggests that the planet has likely always received a level of incident flux above the empirically-identified threshold for radius inflation suggested by Demory & Seager (2011).

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Re: KELT Results

Post by Sirius_Alpha on 4th April 2013, 3:58 pm

Mention of KELT-6 b here, on what looks like the project homepage?.

We present the discovery of KELT-6b, a mildly inflated transiting Saturn, orbiting a metal-poor star. A joint analysis of the spectroscopic, radial velocity, and photometric data indicates the planet has a mass of 0.5 M_J, radius of 1.3 R_J, and an orbital period of ~8 days. The bright (V~10) host is a slightly evolved, metal-poor F star with [Fe/H]~-0.3 and an inferred mass and radius of ~1.2 M_sol and ~1.7 R_sol. Although KELT-6 is more evolved than HD209458, the orbital period of KELT-6b is longer than HD209458b, resulting in almost identical incident flux at both planets. Thus, KELT-6b is a metal-poor twin of HD209458b, one of the best understood exoplanets, and offers the unique opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities in order to test theories of exoplanetary atmospheres, in particular the causes of atmospheric temperature inversions, and to test theories of planet formation. High resolution radial velocity data indicate a possible longer period third body in the system. No companions are detected in Keck adaptive optics imagery, allowing constraints on the mass and period of the putative companion.

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Re: KELT Results

Post by Edasich on 5th April 2013, 3:03 am

Great find, Sirius! Now I wonder what's with KELT-4 and 5, yet unreleased too...
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Re: KELT Results

Post by Lazarus on 4th June 2013, 2:55 pm

Well KELT-6b has arrived in the news

Space.com:
Saturn-Like Alien Planet Found by Little Telescope
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Re: KELT Results

Post by Edasich on 4th June 2013, 4:58 pm

I wonder what's happened to KELT-4 and 5 b...
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Re: KELT Results

Post by Lazarus on 4th June 2013, 5:01 pm

They were eaten by aliens.
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Re: KELT Results

Post by Edasich on 5th June 2013, 4:29 am

Lazarus wrote:They were eaten by aliens.

Something a bit hard to digest... Rolling Eyes
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Re: KELT Results

Post by Lazarus on 5th June 2013, 5:15 pm

aaargh... walked right into that one!
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Re: KELT Results

Post by Edasich on 13th August 2013, 3:43 am

KELT-6 b, at last.

KELT-6b: A P~7.9 d Hot Saturn Transiting a Metal-Poor Star with a Long-Period Companion

We report the discovery of KELT-6b, a mildly-inflated Saturn-mass planet transiting a metal-poor host. The initial transit signal was identified in KELT-North survey data, and the planetary nature of the occulter was confirmed using a combination of follow-up photometry, high-resolution imaging, high-resolution spectroscopy, and precise radial velocity measurements. The fiducial model from a global analysis including constraints from isochrones indicates that the V=10.38 host star (TYC 2532-556-1) is a mildly evolved, late-F star with T_eff=6102 \pm 43 K, log(g_*)=4.07_{-0.07}^{+0.04} and [Fe/H]=-0.28 \pm 0.04, with an inferred mass M_*=1.09 \pm 0.04 M_sun and radius R_*=1.58_{-0.09}^{+0.16} R_sun. The planetary companion has mass M_p=0.43 \pm 0.05 M_Jup, radius R_p=1.19_{-0.08}^{+0.13} R_Jup, surface gravity log(g_p)=2.86_{-0.08}^{+0.06}, and density rho_p=0.31_{-0.08}^{+0.07} g cm^{-3}. The planet is on an orbit with semimajor axis a=0.079 \pm 0.001 AU and eccentricity e=0.22_{-0.10}^{+0.12}, which is roughly consistent with circular, and has ephemeris of T_C(BJD_TDB)=2456347.79679 \pm 0.00036 and P=7.845631 \pm 0.000046 d. Equally plausible fits that employ empirical constraints on the host star parameters rather than isochrones yield a larger planet mass and radius by ~4-7%. KELT-6b has surface gravity and incident flux similar to HD 209458b, but orbits a host that is more metal poor than HD 209458b by ~0.3 dex. Thus, the KELT-6 system is a metal-poor analog of HD 209458, and offers the unique opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities. The precise radial velocity data also reveal an acceleration indicative of a longer-period third body in the system, although the companion is not detected in Keck adaptive optics images.
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Re: KELT Results

Post by Edasich on 30th October 2013, 10:42 am

KELT-1 b added to EPE:

http://exoplanet.eu/catalog/kelt-1_b/
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Re: KELT Results

Post by Lazarus on 30th October 2013, 2:40 pm

Beatty et al. "Spitzer and z' Secondary Eclipse Observations of the Highly Irradiated Transiting Brown Dwarf KELT-1b"
http://arxiv.org/abs/1310.7585

Considers the object from two perspectives: as a hot Jupiter with high surface gravity, and as a brown dwarf with high irradiation.
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Re: KELT Results

Post by Edasich on 23rd January 2015, 3:35 am

Thread bump for KELT-7 (4 and 5 still missing)... Rolling Eyes

KELT-7b: A hot Jupiter transiting a bright V=8.54 rapidly rotating F-star

We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of $1.28 \pm 0.18$ MJ, radius of $1.53_{-0.047}^{+0.046}$ RJ, and an orbital period of $2.7347749 \pm 0.0000039$ days. The bright host star (HD33643; KELT-7) is an F-star with $V=8.54$, Teff $=6789_{-49}^{+50}$ K, [Fe/H] $=0.139_{-0.081}^{+0.075}$, and $\log{g}=4.149 \pm 0.019$. It has a mass of $1.535_{-0.054}^{+0.066}$ Msun, a radius of $1.732_{-0.045}^{+0.043}$ Rsun, and is the fifth most massive, fifth hottest, and the ninth brightest star known to host a transiting planet. It is also the brightest star around which KELT has discovered a transiting planet. Thus, KELT-7b is an ideal target for detailed characterization given its relatively low surface gravity, high equilibrium temperature, and bright host star. The rapid rotation of the star ($73 \pm 0.5$ km/s) results in a Rossiter-McLaughlin effect with an unusually large amplitude of several hundred m/s. We find that the orbit normal of the planet is likely to be well-aligned with the stellar spin axis, with a projected spin-orbit alignment of $\lambda=9.7 \pm 5.2$ degrees. This is currently the most rapidly rotating star to have a reflex signal (and thus mass determination) due to a planetary companion measured.
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Re: KELT Results

Post by Sirius_Alpha on 23rd January 2015, 3:59 am

From the KELT-6b paper...
The designations KELT-4 and KELT-5 are currently reserved for two candidates in the confirmation phase.

KELT-4 b appears to be being held up for further study of it's infrared emission.

Call it a suspicion that KELT-5 b is being held up because the host star is kinda wonky.

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Re: KELT Results

Post by Edasich on 27th May 2015, 3:51 am

Let's go straight... to number 8! Laughing

KELT-8b: A highly inflated transiting hot Jupiter and a new technique for extracting high-precision radial velocities from noisy spectra

We announce the discovery of a highly inflated transiting hot Jupiter discovered by the KELT-North survey. A global analysis including constraints from isochrones indicates that the V = 10.8 host star (HD 343246) is a mildly evolved, G dwarf with Teff=5754+54-55 K, logg=4.078+0.049-0.054, [Fe/H]=0.2720.038, an inferred mass M∗=1.211+0.078-0.066 M⊙, and radius R∗=1.67+0.14-0.12 R⊙. The planetary companion has mass MP=0.867+0.065-0.061 MJ, radius RP=1.86+0.18-0.16 RJ, surface gravity loggP=2.793+0.072-0.075, and density ρP=0.167+0.047-0.038[/sub] g cm[sup]-3. The planet is on a roughly circular orbit with semimajor axis a=0.04571+0.00096-0.00084 AU and eccentricity e=0.035+0.050-0.025. The best-fit linear ephemeris is T0=2456883.48030.0007 BJDTDB and P=3.244060.00016 days. This planet is one of the most inflated of all known transiting exoplanets, making it one of the few members of a class of extremely low density, highly-irradiated gas giants. The low stellar logg and large implied radius are supported by stellar density constraints from follow-up light curves, plus an evolutionary and space motion analysis. We also develop a new technique to extract high precision radial velocities from noisy spectra that reduces the observing time needed to confirm transiting planet candidates. This planet boasts deep transits of a bright star, a large inferred atmospheric scale height, and a high equilibrium temperature of Teq=1675+61-55 K, assuming zero albedo and perfect heat redistribution, making it one of the best targets for future atmospheric characterization studies.
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Re: KELT Results

Post by Led_Zep on 26th August 2015, 8:36 pm

http://arxiv.org/abs/1508.06520

The GAPS Programme with HARPS-N@TNG X. The multi-planet system KELT-6: detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b

Aims. For more than 1.5 years we monitored spectroscopically the star KELT-6 (BD+312447), known to host the transiting hot Saturn KELT-6b, because a previously observed long-term trend in radial velocity time series suggested the existence of an outer companion. Methods. We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6b was observed with HARPS-N, and simultaneous photometry was obtained with the IAC-80 telescope. Results. We proved the existence of an outer planet with a mininum mass Mpsini=3.710.21 MJup and a moderately eccentric orbit (e=0.21+0.039−0.036) of period P∼3.5 years. We improved the orbital solution of KELT-6b and obtained the first measurement of the Rossiter-McLaughlin effect, showing that the planet has a likely circular, prograde, and slightly misaligned orbit, with a projected spin-orbit angle λ=−3611 degrees. We improved the KELT-6b transit ephemeris from photometry, and we provided new measurements of the stellar parameters. KELT-6 appears as an interesting case to study the formation and evolution of multi-planet systems
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Re: KELT Results

Post by Edasich on 27th August 2015, 4:21 am

It's nice to see an increasing numer of transiting exoplanet hosts turning to multiple planet systems. Very Happy
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Re: KELT Results

Post by Sirius_Alpha on 8th September 2015, 9:58 pm

Here's KELT-10b
http://arxiv.org/pdf/1509.02323

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Re: KELT Results

Post by Edasich on 9th September 2015, 4:20 am

Sirius_Alpha wrote:Here's KELT-10b
http://arxiv.org/pdf/1509.02323

First (transiting) extrasolar planet in Telescopium constellation. Very Happy
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Re: KELT Results

Post by Lazarus on 9th September 2015, 11:08 am

I never keep track of the constellations, unless it's a Bayer/Flamsteed/variable star designation which makes it obvious. Smile

Have all 88 constellations now had exoplanets discovered yet?
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Re: KELT Results

Post by Sirius_Alpha on 9th September 2015, 11:56 am

Also, do you have a list of which exoplanets are in each constellation?

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Re: KELT Results

Post by Edasich on 10th September 2015, 4:02 am

Sirius_Alpha wrote:Also, do you have a list of which exoplanets are in each constellation?

Sure. What a Face Like a Star @ heaven

With KELT-10 b I think almost all of the 88 constellations have exoplanets detected.
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