Debris disc candidates in systems with transiting planets

Krivov, A. V.; Reidemeister, M.; Fiedler, S.; Löhne, T.; Neuhäuser, R.

doi:10.1111/j.1745-3933.2011.01133.x

Cited by 12 publications

(29 citation statements)

References 40 publications

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“…For TrES-2 (KIC 11446443) we do not detect excess in W3 with high enough significance. The SDSS optical photometry coupled with the VOSA analysis confirms the lower effective temperature reported by O'Donovan et al (2006) as compared with the higher best-fit temperature found by Krivov et al (2011). That makes the observed W3 flux not so different from the photospheric value (χ 12 = 0.9) and therefore we conclude that the excess is not significant.…”

Section: Image Inspectionsupporting

confidence: 65%

“…This does not affect that band's fluxes and will not affect our analysis. By performing an analogous analysis, Krivov et al (2011) selected HAT-P-5, and CoRoT-8 as candidate sources with excesses in W4 and TrES-2 and XO-5 as candidates sources with excesses at W3 and W4. However, we do not confirm any of these as excess sources.…”

Section: Image Inspectionmentioning

confidence: 99%

“…We used as input the value of the extinction provided in the KIC, with the extinction law by Cardelli et al (1989). For the nonKepler sources, we have assumed A V = 0.0 mag, a good approximation to the actual extinctions, as found by Krivov et al (2011) in the objects in common.…”

Section: Sed Fittingmentioning

confidence: 99%

“…In this paper we present the results of a search for warm debris disks, primarily around Kepler transiting planet candidates. Krivov et al (2011) have presented a similar study using pre-Kepler confirmed transiting systems, and in order to compare our technique with theirs we also include previously known transiting systems 2 as described in Poddaný et al (2010).…”

Section: Introductionmentioning

confidence: 99%

“…Starting from a sample of 93 confirmed transiting hosts from exoplanets.org, Krivov et al (2011) found 53 counterparts in the WISE sample. They do not describe the details of their matching protocol, but our detection fractions for non-Kepler objects are comparable to theirs, suggesting techniques with similar efficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Warm debris disks candidates in transiting planets systems

Ribas

Merın

Ardila

et al. 2012

A&A

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We have bandmerged candidate transiting planetary systems (from the Kepler satellite) and confirmed transiting planetary systems (from the literature) with the recent Wide-field Infrared Survey Explorer (WISE) preliminary release catalog. We have found 13 stars showing infrared excesses at either 12 μm and/or 22 μm. Without longer wavelength observations it is not possible to conclusively determine the nature of the excesses, although we argue that they are likely due to debris disks around the stars. If confirmed, our sample ∼doubles the number of currently known warm excess disks around old main sequence stars. The ratios between the measured fluxes and the stellar photospheres are generally larger than expected for Gyr-old stars, such as these planetary hosts. Assuming temperature limits for the dust and emission from large dust particles, we derive estimates for the disk radii. These values are comparable to the planet's semi-major axis, suggesting that the planets may be stirring the planetesimals in the system.

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Section: Image Inspectionsupporting

confidence: 65%

Section: Image Inspectionmentioning

confidence: 99%

Section: Sed Fittingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Warm debris disks candidates in transiting planets systems

Ribas

Merın

Ardila

et al. 2012

A&A

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DEBRIS DISKS INKEPLEREXOPLANET SYSTEMS

Lawler

Gladman

2012

ApJ

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The Kepler Mission recently identified 997 systems hosting candidate extrasolar planets, many of which are super-Earths. Realizing these planetary systems are candidates to host extrasolar asteroid belts, we use mid-infrared data from the Wide-field Infrared Survey Explorer (WISE) to search for emission from dust in these systems. We find excesses around eight stars, indicating the presence of warm to hot dust (∼100-500 K), corresponding to orbital distances of 0.1-10 AU for these solar-type stars. The strongest detection, KOI 1099, demands ∼500 K dust interior to the orbit of its exoplanet candidate. One star, KOI 904, may host very hot dust (∼1200 K, corresponding to 0.02 AU). Although the fraction of these exoplanet-bearing stars with detectable warm excesses (∼3%) is similar to that found by Spitzer surveys of solar-type field stars, the excesses detectable in the WISE data have much higher fractional luminosities (L dust /L * ) than most known debris disks, implying that the fraction with debris disks of comparable luminosity may actually be significantly higher. It is difficult to explain the presence of dust so close to the host stars, generally corresponding to dust rings at radii <0.3 AU; both the collisional and Poynting-Robertson drag timescales to remove dust from the system are hundreds of years or less at these distances. Assuming a steady-state for these systems implies large mass consumption rates with these short removal timescales, meaning that the dust production mechanism in these systems must almost certainly be episodic in nature.

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WISEDETECTIONS OF DUST IN THE HABITABLE ZONES OF PLANET-BEARING STARS

Morales

Padgett

Bryden

et al. 2012

ApJ

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We use data from the Wide-field Infrared Survey Explorer (WISE) all-sky release to explore the incidence of warm dust in the habitable zones around exoplanet-host stars. Dust emission at 12 and/or 22 μm (T dust ∼ 300 and/or ∼150 K) traces events in the terrestrial planet zones; its existence implies replenishment by evaporation of comets or collisions of asteroids, possibly stirred by larger planets. Of the 591 planetary systems (728 extrasolar planets) in the Exoplanet Encyclopaedia as of 2012 January 31, 350 are robustly detected by WISE at 5σ level. We perform detailed photosphere subtraction using tools developed for Spitzer data and visually inspect all the WISE images to confirm bona fide point sources. We find nine planet-bearing stars show dust excess emission at 12 and/or 22 μm at 3σ level around young, main-sequence, or evolved giant stars. Overall, our results yield an excess incidence of ∼2.6% for stars of all evolutionary stages, but ∼1% for planetary debris disks around main-sequence stars. Besides recovering previously known warm systems, we identify one new excess candidate around the young star UScoCTIO 108.

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Debris disc candidates in systems with transiting planets

Cited by 12 publications

References 40 publications

Warm debris disks candidates in transiting planets systems

Warm debris disks candidates in transiting planets systems

DEBRIS DISKS INKEPLEREXOPLANET SYSTEMS

WISEDETECTIONS OF DUST IN THE HABITABLE ZONES OF PLANET-BEARING STARS

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