Rate and nature of false positives in the CoRoT exoplanet search

Almenara, J. M.; Deeg, H. J.; Aigrain, S.; Alonso, R.; Auvergne, M.; Baglin, A.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Bruntt, H.; Cabrera, J.; Carone, L.; Carpano, S.; Catala, C.; Csizmadia, Sz.; Reza, R. de la; Deleuil, M.; Dvořák, R.; Erikson, A.; Fridlund, M.; Gandolfi, D.; Gillon, M.; Gondoin, P.; Guenther, E. W.; Guillot, T.; Hatzes, A. P.; Hébrard, G.; Jordá, L.; Lämmer, H.; Léger, Alain; Llebaria, A.; Loeillet, B.; Magain, Pierre; Mayor, M.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Schneider, Jodi; Shporer, Avi; Wuchterl, G.; Zucker, S.

doi:10.1051/0004-6361/200911926

Cited by 49 publications

(49 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is more difficult to find this secondary around faint targets because the signal-to-noise ratio is poorer, which possibly makes the contamination of binaries higher at the faint end, reducing the performance of the planet detection. Recently, Almenara et al (2009) have published a detailed study evaluating the rates and nature of false positives in the first CoRoT fields observed, which also provides insight into the nature of the planetary populations detected with CoRoT.…”

Section: Discussionmentioning

confidence: 99%

Planetary transit candidates in CoRoT-LRc01 field

Cabrera

Fridlund

Ollivier

et al. 2009

A&A

Self Cite

View full text Add to dashboard Cite

Aims. We present here the list of planetary transit candidates detected in the first long run observed by CoRoT: LRc01, towards the galactic center in the direction of Aquila, which lasted from May to October 2007. Methods. we analyzed 3719 (33%) sources in the chromatic bands and 7689 in the monochromatic band. Instrumental noise and the stellar variability were treated with several detrending tools, on which subsequently several transit search algorithms were applied. Results. Forty two sources were classified as planetary transit candidates and up to now 26 cases have been solved. One planet (CoRoT-2b) and one brown-dwarf (CoRoT-3b) have been the subjects of detailed publications.

show abstract

Section: Discussionmentioning

confidence: 99%

Planetary transit candidates in CoRoT-LRc01 field

Cabrera

Fridlund

Ollivier

et al. 2009

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, in most cases photometry alone does not allow the planetary nature of the detected transits to be established. Indeed, several stellar configurations can mimic planetary transits (e.g., Almenara et al 2009;Bouchy et al 2009a), including undiluted eclipsing binaries with low-mass stellar companions or diluted eclipsing binaries, namely blends. Whereas such impostors represent the majority of transiting planet candidates detected by ground-based surveys or even by CoRoT, it has been argued from statistical studies that they should be particularly rare for Kepler candidates (e.g., Morton & Johnson 2011).…”

Section: Introductionmentioning

confidence: 99%

KOI-200 b and KOI-889 b: Two transiting exoplanets detected and characterized withKepler, SOPHIE, and HARPS-N

Hébrard¹,

Almenara²,

Santerne³

et al. 2013

A&A

Self Cite

View full text Add to dashboard Cite

We present the detection and characterization of the two new transiting, close-in, giant extrasolar planets KOI-200 b and KOI-889 b. They were first identified by the Kepler team as promising candidates from photometry of the Kepler satellite; we then established their planetary nature thanks to the radial velocity follow-up jointly secured with the spectrographs SOPHIE and HARPS-N. Combined analyses of the whole datasets allow the two planetary systems to be characterized. The planet KOI-200 b has mass and radius of 0.68 ± 0.09 M Jup and 1.32 ± 0.14 R Jup ; it orbits in 7.34 days a F8V host star with mass and radius of 1.40 +0.14 −0.11 M and 1.51 ± 0.14 R . The planet KOI-889 b is a massive planet with mass and radius of 9.9 ± 0.5 M Jup and 1.03 ± 0.06 R Jup ; it orbits in 8.88 days an active G8V star with a rotation period of 19.2 ± 0.3 days, and mass and radius of 0.88 ± 0.06 M and 0.88 ± 0.04 R . Both planets lie on eccentric orbits and are located just at the frontier between regimes where tides can explain circularization and where tidal effects are negligible. The two planets are among the first detected and characterized thanks to observations secured with HARPS-N, the new spectrograph recently mounted at the Telescopio Nazionale Galileo. These results illustrate the benefits that could be obtained from joint studies using two spectrographs as SOPHIE and HARPS-N.

show abstract

“…First general results on the types of false alarm sources are given in Almenara et al (2009) , Fig. 6.…”

Section: Results From the Photometric Follow-upmentioning

confidence: 99%

Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission

Deeg¹,

Gillon

Shporer

et al. 2009

A&A

Self Cite

104

View full text Add to dashboard Cite

The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d'être arises from the much higher spatial resolution of common ground-based telescopes in comparison to CoRoT's cameras. This allows the identification of many transit candidates as arising from eclipsing binaries that are contaminating CoRoT's lightcurves, even in low-amplitude transit events that cannot be detected with ground-based obervations. For the ground observations, "on" -"off" photometry is now largely employed, in which only a short timeseries during a transit and a section outside a transit is observed and compared photometrically. CoRoTplanet candidates' transits are being observed by a dedicated team with access to telescopes with sizes ranging from 0.2 to 2 m. As an example, the process that led to the rejection of contaminating eclipsing binaries near the host star of the Super-Earth planet CoRoT-7b is shown. Experiences and techniques from this work may also be useful for other transit-detection experiments, when the discovery instrument obtains data with a relatively low angular resolution.

show abstract

Rate and nature of false positives in the CoRoT exoplanet search

Cited by 49 publications

References 16 publications

Planetary transit candidates in CoRoT-LRc01 field

Planetary transit candidates in CoRoT-LRc01 field

KOI-200 b and KOI-889 b: Two transiting exoplanets detected and characterized withKepler, SOPHIE, and HARPS-N

Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission

Contact Info

Product

Resources

About