SIMBAD references

2012A&A...546A..10L - Astronomy and Astrophysics, volume 546A, 10-10 (2012/10-1)

Multiplicity in transiting planet-host stars. A lucky imaging study of Kepler candidates.

LILLO-BOX J., BARRADO D. and BOUY H.

Abstract (from CDS):

In the exoplanetary era, the Kepler spacecraft is causing a revolution by discovering thousands of new planet candidates. However, a follow-up program is needed to reject false candidates and fully characterize the bona-fide exoplanets. Our main aims are to 1./ detect and analyze close companions inside the typical Kepler point spread function (PSF) to study whether they are the responsible for the dimming found in Kepler light curves, 2./ study the change in the stellar and planetary parameters caused by an unresolved object, 3./ help validate the Kepler objects of interest (KOI) that do not have any object inside the Kepler PSF, and 4./ study the multiplicity rate of planet-host candidates. Such a large sample of observed planet-host candidates allows us to derive statistics for close (visual or bounded) companions to the harboring star. We present lucky imaging observations for a total of 98 KOIs. This technique is based on the acquisition of thousands of very-short-exposure-time images. A selection and combination of a small amount of the highest quality frames provides a high resolution image with objects having a 0.1-arcsec PSF. We apply this technique to carry out observations in the Sloan i and z filters of our Kepler candidates. We find blended objects inside the Kepler PSF for a significant percentage of KOIs. On the one hand, only 58.2% of the hosts do not have any object within 6-arcsec. On the other hand, we find 19 companions closer than 3 arcsec in 17 KOIs. According to their magnitudes and i-z colors, 8 of them could be physically bound to the host star.

Abstract Copyright:

Journal keyword(s): binaries: visual - instrumentation: high angular resolution - planets and satellites: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/546/A10): table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat>

Status at CDS : Examining the need for a new acronym.

Simbad objects: 51

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