THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING

E. Furlan, D. R. Ciardi, M. E. Everett, M. Saylors, J. K. Teske, E. P. Horch, S. B. Howell, G. T. Van Belle, L. A. Hirsch, T. N. Gautier, E. R. Adams, D. Barrado, K. M.S. Cartier, C. D. Dressing, A. K. Dupree, Ronald Lynn Gilliland, J. Lillo-Box, P. W. Lucas, J. Wang

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Abstract

We present results from high-resolution, optical to near-IR imaging of host stars of Kepler Objects of Interest (KOIs), identified in the original Kepler field. Part of the data were obtained under the Kepler imaging follow-up observation program over six years (2009-2015). Almost 90% of stars that are hosts to planet candidates or confirmed planets were observed. We combine measurements of companions to KOI host stars from different bands to create a comprehensive catalog of projected separations, position angles, and magnitude differences for all detected companion stars (some of which may not be bound). Our compilation includes 2297 companions around 1903 primary stars. From high-resolution imaging, we find that ∼10% (∼30%) of the observed stars have at least one companion detected within 1″ (4″). The true fraction of systems with close (≲4″) companions is larger than the observed one due to the limited sensitivities of the imaging data. We derive correction factors for planet radii caused by the dilution of the transit depth: assuming that planets orbit the primary stars or the brightest companion stars, the average correction factors are 1.06 and 3.09, respectively. The true effect of transit dilution lies in between these two cases and varies with each system. Applying these factors to planet radii decreases the number of KOI planets with radii smaller than 2 R by ∼2%-23% and thus affects planet occurrence rates. This effect will also be important for the yield of small planets from future transit missions such as TESS.

Original languageEnglish (US)
Article number71
JournalAstronomical Journal
Volume153
Issue number2
DOIs
StatePublished - Feb 1 2017

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catalogs
planets
planet
stars
transit
companion stars
radii
dilution
programme
high resolution
occurrences
orbits
sensitivity

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Furlan, E., Ciardi, D. R., Everett, M. E., Saylors, M., Teske, J. K., Horch, E. P., ... Wang, J. (2017). THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING. Astronomical Journal, 153(2), [71]. https://doi.org/10.3847/1538-3881/153/2/71
Furlan, E. ; Ciardi, D. R. ; Everett, M. E. ; Saylors, M. ; Teske, J. K. ; Horch, E. P. ; Howell, S. B. ; Van Belle, G. T. ; Hirsch, L. A. ; Gautier, T. N. ; Adams, E. R. ; Barrado, D. ; Cartier, K. M.S. ; Dressing, C. D. ; Dupree, A. K. ; Gilliland, Ronald Lynn ; Lillo-Box, J. ; Lucas, P. W. ; Wang, J. / THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING. In: Astronomical Journal. 2017 ; Vol. 153, No. 2.
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abstract = "We present results from high-resolution, optical to near-IR imaging of host stars of Kepler Objects of Interest (KOIs), identified in the original Kepler field. Part of the data were obtained under the Kepler imaging follow-up observation program over six years (2009-2015). Almost 90{\%} of stars that are hosts to planet candidates or confirmed planets were observed. We combine measurements of companions to KOI host stars from different bands to create a comprehensive catalog of projected separations, position angles, and magnitude differences for all detected companion stars (some of which may not be bound). Our compilation includes 2297 companions around 1903 primary stars. From high-resolution imaging, we find that ∼10{\%} (∼30{\%}) of the observed stars have at least one companion detected within 1″ (4″). The true fraction of systems with close (≲4″) companions is larger than the observed one due to the limited sensitivities of the imaging data. We derive correction factors for planet radii caused by the dilution of the transit depth: assuming that planets orbit the primary stars or the brightest companion stars, the average correction factors are 1.06 and 3.09, respectively. The true effect of transit dilution lies in between these two cases and varies with each system. Applying these factors to planet radii decreases the number of KOI planets with radii smaller than 2 R⊕ by ∼2{\%}-23{\%} and thus affects planet occurrence rates. This effect will also be important for the yield of small planets from future transit missions such as TESS.",
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Furlan, E, Ciardi, DR, Everett, ME, Saylors, M, Teske, JK, Horch, EP, Howell, SB, Van Belle, GT, Hirsch, LA, Gautier, TN, Adams, ER, Barrado, D, Cartier, KMS, Dressing, CD, Dupree, AK, Gilliland, RL, Lillo-Box, J, Lucas, PW & Wang, J 2017, 'THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING', Astronomical Journal, vol. 153, no. 2, 71. https://doi.org/10.3847/1538-3881/153/2/71

THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING. / Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M.S.; Dressing, C. D.; Dupree, A. K.; Gilliland, Ronald Lynn; Lillo-Box, J.; Lucas, P. W.; Wang, J.

In: Astronomical Journal, Vol. 153, No. 2, 71, 01.02.2017.

Research output: Contribution to journalArticle

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T1 - THE KEPLER FOLLOW-UP OBSERVATION PROGRAM. I. A CATALOG of COMPANIONS to KEPLER STARS from HIGH-RESOLUTION IMAGING

AU - Furlan, E.

AU - Ciardi, D. R.

AU - Everett, M. E.

AU - Saylors, M.

AU - Teske, J. K.

AU - Horch, E. P.

AU - Howell, S. B.

AU - Van Belle, G. T.

AU - Hirsch, L. A.

AU - Gautier, T. N.

AU - Adams, E. R.

AU - Barrado, D.

AU - Cartier, K. M.S.

AU - Dressing, C. D.

AU - Dupree, A. K.

AU - Gilliland, Ronald Lynn

AU - Lillo-Box, J.

AU - Lucas, P. W.

AU - Wang, J.

PY - 2017/2/1

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N2 - We present results from high-resolution, optical to near-IR imaging of host stars of Kepler Objects of Interest (KOIs), identified in the original Kepler field. Part of the data were obtained under the Kepler imaging follow-up observation program over six years (2009-2015). Almost 90% of stars that are hosts to planet candidates or confirmed planets were observed. We combine measurements of companions to KOI host stars from different bands to create a comprehensive catalog of projected separations, position angles, and magnitude differences for all detected companion stars (some of which may not be bound). Our compilation includes 2297 companions around 1903 primary stars. From high-resolution imaging, we find that ∼10% (∼30%) of the observed stars have at least one companion detected within 1″ (4″). The true fraction of systems with close (≲4″) companions is larger than the observed one due to the limited sensitivities of the imaging data. We derive correction factors for planet radii caused by the dilution of the transit depth: assuming that planets orbit the primary stars or the brightest companion stars, the average correction factors are 1.06 and 3.09, respectively. The true effect of transit dilution lies in between these two cases and varies with each system. Applying these factors to planet radii decreases the number of KOI planets with radii smaller than 2 R⊕ by ∼2%-23% and thus affects planet occurrence rates. This effect will also be important for the yield of small planets from future transit missions such as TESS.

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