PLANET HUNTERS. VIII. CHARACTERIZATION OF 41 LONG-PERIOD EXOPLANET CANDIDATES FROM <i>KEPLER</i> ARCHIVAL DATA

Ji, Wang; Fischer, Debra A.; Barclay, Thomas; Picard, Alyssa; Ma, Bo; Bowler, Brendan P.; Schmitt, Joseph R.; Boyajian, Tabetha S.; Jek, Kian J.; LaCourse, D.; Baranec, Christoph; Riddle, Reed; Law, Nicholas M.; Lintott, Chris; Schawinski, Kevin; Simister, Dean Joseph; Gregoire, Boscher; Babin, Sean P.; Poile, Trevor; Jacobs, T.; Jebson, Tony; Omohundro, Mark; Schwengeler, Hans Martin; Sejpka, Johann; Terentev, Ivan A.; Gagliano, R.; Paakkonen, Jari-Pekka; Berge, Hans Kristian Otnes; Winarski, Troy; Green, Gerald R.; Schmitt, Allan R.; Kristiansen, Martti H.; Hoekstra, Abe J.

doi:10.1088/0004-637x/815/2/127

Cited by 92 publications

(97 citation statements)

References 65 publications

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“…There have also been a number of searches carried out for single (i.e., 'orphaned') exoplanet transits (Wang et al 2015;Foreman-Mackey et al 2016;Uehara et al 2016, Schmitt et al 2017. Additionally, searches for astrophysical transit signals that are only quasi-periodic have been carried out in an automated way (see, e.g., Carter & Agol 2013).…”

Section: Visual Search Of the Kepler Data Setmentioning

confidence: 99%

Likely transiting exocomets detected by Kepler

Rappaport

Vanderburg

Jacobs

et al. 2017

Monthly Notices of the Royal Astronomical Society

105

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We present the first good evidence for exocomet transits of a host star in continuum light in data from the Kepler mission. The Kepler star in question, KIC 3542116, is of spectral type F2V and is quite bright at K p = 10. The transits have a distinct asymmetric shape with a steeper ingress and slower egress that can be ascribed to objects with a trailing dust tail passing over the stellar disk. There are three deeper transits with depths of 0.1% that last for about a day, and three that are several times more shallow and of shorter duration. The transits were found via an exhaustive visual search of the entire Kepler photometric data set, which we describe in some detail. We review the methods we use to validate the Kepler data showing the comet transits, and rule out instrumental artefacts as sources of the signals. We fit the transits with a simple dust-tail model, and find that a transverse comet speed of ∼35-50 km s −1 and a minimum amount of dust present in the tail of ∼ 10 16 g are required to explain the larger transits. For a dust replenishment time of ∼10 days, and a comet lifetime of only ∼300 days, this implies a total cometary mass of 3 × 10 17 g, or about the mass of Halley's comet. We also discuss the number of comets and orbital geometry that would be necessary to explain the six transits detected over the four years of Kepler prime-field observations. Finally, we also report the discovery of a single comet-shaped transit in KIC 11084727 with very similar transit and host-star properties.

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Section: Visual Search Of the Kepler Data Setmentioning

confidence: 99%

Likely transiting exocomets detected by Kepler

Rappaport

Vanderburg

Jacobs

et al. 2017

Monthly Notices of the Royal Astronomical Society

105

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“…Similarly, three of the 17 single transiting exoplanets detected by Wang et al (2015) were probabilistically validated using such methods.…”

Section: Validationmentioning

confidence: 99%

Single transit candidates from K2: detection and period estimation

Osborn

Armstrong

Brown

et al. 2016

Mon. Not. R. Astron. Soc.

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Photometric surveys such as Kepler have the precision to identify exoplanet and eclipsing binary candidates from only a single transit. K2, with its 75 d campaign duration, is ideally suited to detect significant numbers of single-eclipsing objects. Here we develop a Bayesian transit-fitting tool ('Namaste: An Mcmc Analysis of Single Transit Exoplanets') to extract orbital information from single transit events. We achieve favourable results testing this technique on known Kepler planets, and apply the technique to seven candidates identified from a targeted search of K2 campaigns 1, 2 and 3. We find EPIC203311200 to host an excellent exoplanet candidate with a period, assuming zero eccentricity, of 540 +410 −230 d and a radius of 0.51 ± 0.05R Jup . We also find six further transit candidates for which more follow-up is required to determine a planetary origin. Such a technique could be used in the future with TESS, PLATO and ground-based photometric surveys such as NGTS, potentially allowing the detection of planets in reach of confirmation by Gaia.

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“…Its photometric noises are ≈ 4× larger than Kepler's for a given brightness for CoRoT andGilliland et al 2010, Jenkins et al 2010 for Kepler) and the time-coverage of its observations is between 30 and 180 days, depending on the observational run, in contrast to the ≈ 4 years of Kepler. Detection probabilities in the CoRoT sample are therefore more heavily tilted towards the discovery of shorter-periodic planets than are data from Kepler, with the longest-periodic CoRoT planet around a single star being CoRoT-9b with p = 95 days , whereas the longest-periodic Kepler planet is Kepler-455b with p = 1322 days (Wang et al 2015a, there given as KIC 3558849 b).…”

Section: Introductionmentioning

confidence: 99%

Limits to the presence of transiting circumbinary planets in CoRoT Data

Klagyivik

Deeg

Cabrera

et al. 2017

A&A

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Aims. The CoRoT mission during its flight-phase 2007-2012 delivered the light-curves for over 2000 eclipsing binaries. Data from the Kepler mission have proven the existence of several transiting circumbinary planets. Albeit light-curves from CoRoT have typically lower precision and shorter coverage, CoRoT's number of targets is similar to Kepler, and some of the known circumbinary planets could potentially be detected in CoRoT data as well. The aim of this work has been a revision of the entire CoRoT data-set for the presence of circumbinary planets, and the derivation of limits to the abundances of such planets. Methods. We developed a code which removes the light curve of the eclipsing binaries and searches for quasi-periodic transit-like features in a light curve after removal of binary eclipses and instrumental features. The code needs little information on the sample systems and can be used for other space missions as well, like Kepler, K2, TESS and PLATO. The code is broad in the requirements leading to detections, but was tuned to deliver an amount of detections that is manageable in a subsequent, mainly visual, revision about their nature. Results. In the CoRoT sample we identified three planet candidates whose transits would have arisen from a single pass across the central binary. No candidates remained however with transit events from multiple planetary orbits. We calculated the upper limits for the number of Jupiter, Saturn and Neptune sized planets in co-planar orbits for different orbital period ranges. We found that there are much less giant planets in short-periodic orbits around close binary systems than around single stars.

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PLANET HUNTERS. VIII. CHARACTERIZATION OF 41 LONG-PERIOD EXOPLANET CANDIDATES FROM KEPLER ARCHIVAL DATA

Cited by 92 publications

References 65 publications

Likely transiting exocomets detected by Kepler

Likely transiting exocomets detected by Kepler

Single transit candidates from K2: detection and period estimation

Limits to the presence of transiting circumbinary planets in CoRoT Data

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