Planetary Candidates From the First Year of the K2 Mission

Vanderburg, Andrew; Latham, David W.; Buchhave, Lars A.; Bieryla, Allyson; Berlind, P.; Calkins, M.; Esquerdo, Gilbert A.; Welsh, Sophie; Johnson, John Asher

doi:10.3847/0067-0049/222/1/14

Cited by 235 publications

(374 citation statements)

References 68 publications

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“…Afterwards, the data were downlinked to Earth, processed by the Kepler pipeline to calibrate the raw pixel level data, and released publicly. We downloaded the data for K2-141 and all other targets observed by K2 during Campaign 12 from the Mikulski Archive for Space Telescopes (MAST), 31 produced light curves from the calibrated pixel files following Vanderburg & Johnson (2014), and searched for transits as described by Vanderburg et al (2016b). Our transit search identified a strong signal at a period 29 K2-141b has been independently discovered, confirmed, and characterized by Barragán et al (2018).…”

Section: Introductionmentioning

confidence: 86%

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An Ultra-short Period Rocky Super-Earth with a Secondary Eclipse and a Neptune-like Companion around K2-141

Malavolta

Mayo

Louden

et al. 2018

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133

119

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Ultra-short period (USP) planets are a class of low-mass planets with periods shorter than one day. Their origin is still unknown, with photo-evaporation of mini-Neptunes and in situ formation being the most credited hypotheses. Formation scenarios differ radically in the predicted composition of USP planets, and it is therefore extremely important to increase the still limited sample of USP planets with precise and accurate mass and density measurements. We report here the characterization of a USP planet with a period of 0.28 days around K2-141 (EPIC 246393474), and the validation of an outer planet with a period of 7.7 days in a grazing transit configuration. We derived the radii of the planets from the K2 light curve and used high-precision radial velocities gathered with the HARPS-N spectrograph for mass measurements. For K2-141b, we thus inferred a radius of 1.51±0.05R Å and a mass of 5.08±0.41M Å , consistent with a rocky composition and lack of a thick atmosphere. K2-141c is likely a Neptune-like planet, although due to the grazing transits and the non-detection in the RV data set, we were not able to put a strong constraint on its density. We also report the detection of secondary eclipses and phase curve variations for K2-141b. The phase variation can be modeled either by a planet with a geometric albedo of 0.30±0.06 in the Kepler bandpass, or by thermal emission from the surface of the planet at ∼3000 K. Only follow-up observations at longer wavelengths will allow us to distinguish between these two scenarios.

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Section: Introductionmentioning

confidence: 86%

“…After we had identified the two candidate signals, we reprocessed the K2 light curve by simultaneously fitting for the K2 flat field systematics, transit light curves, and stellar variability using the procedure described by Vanderburg et al (2016b). The final light curve is shown in Figure 4.…”

Section: Photometric Analysismentioning

confidence: 99%

An Ultra-short Period Rocky Super-Earth with a Secondary Eclipse and a Neptune-like Companion around K2-141

Malavolta

Mayo

Louden

et al. 2018

Self Cite

133

119

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“…At the time of the writing of this paper, light curves for the stars in Campaign 2 were publicly available at MAST from Luger et al (2016) and Vanderburg et al (2016). We also had available to us two sets of light curves created by co-author Ann Marie Cody (see Cody et al 2017Cody et al , 2018.…”

Section: Newly Identified Stars Of Interest and Observational Datamentioning

confidence: 99%

More Rapidly Rotating PMS M Dwarfs with Light Curves Suggestive of Orbiting Clouds of Material

Stauffer

Rebull

David

et al. 2018

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In a previous paper, using data from K2 Campaign 2, we identified 11 very low mass members of the ρ Oph and Upper Scorpius star-forming region as having periodic photometric variability and phased light curves showing multiple scallops or undulations. All of the stars with the "scallop-shell" light curve morphology are mid-to-late M dwarfs without evidence of active accretion and with photometric periods generally <1 day. Their phased light curves have too much structure to be attributed to non-axisymmetrically distributed photospheric spots and rotational modulation. We have now identified an additional eight probable members of the same star-forming region plus three stars in the Taurus star-forming region with this same light curve morphology and sharing the same period and spectral type range as the previous group. We describe the light curves of these new stars in detail and present their general physical characteristics. We also examine the properties of the overall set of stars in order to identify common features that might help elucidate the causes of their photometric variability.

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“…Several groups also preformed planet searches in the K2 data but only a couple have published lists of planetary candidates: (Foreman-Mackey et al 2015;Vanderburg et al 2016) for campaign 0 to campaign 3.…”

Section: Introductionmentioning

confidence: 99%

New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission

Barros

Deleuil

2016

A&A

104

122

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Context. With only two functional reaction wheels, Kepler cannot maintain stable pointing at its original target field and has entered a new mode of observation called K2. Aims. We describe a new pipeline to reduce K2 pixel files into light curves that are later searched for transit like features. Methods. Our method is based on many years of experience in planet hunting for the CoRoT mission. Owing to the unstable pointing, K2 light curves present systematics that are correlated with the target position in the charge coupled device (CCD). Therefore, our pipeline also includes a decorrelation of this systematic noise. Our pipeline is optimised for bright stars for which spectroscopic follow-up is possible. We achieve a maximum precision on 6 hours of 6 ppm. The decorrelated light curves are searched for transits with an adapted version of the CoRoT alarm pipeline. Results. We present 172 planetary candidates and 327 eclipsing binary candidates from campaigns 1, 2, 3, 4, 5, and 6 of K2. Both the planetary candidates and eclipsing binary candidates lists are made public to promote follow-up studies. The light curves will also be available to the community.

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Planetary Candidates From the First Year of the K2 Mission

Cited by 235 publications

References 68 publications

An Ultra-short Period Rocky Super-Earth with a Secondary Eclipse and a Neptune-like Companion around K2-141

An Ultra-short Period Rocky Super-Earth with a Secondary Eclipse and a Neptune-like Companion around K2-141

More Rapidly Rotating PMS M Dwarfs with Light Curves Suggestive of Orbiting Clouds of Material

New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission

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