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Centroid vetting of transiting planet candidates from the Next Generation Transit Survey

Günther, M. and Queloz, D. and Gillen, E. and McCormac, J and Bayliss, D. D. R. and Bouchy, F. and Walker, S. and West, R. and Eigmüller, P and Smith, A. M. S. and Armstrong, D. J. and Burleigh, M. and Casewell, S and Chaushev, A. and Goad, M. and Grange, A. and Jackman, J. and Jenkins, J. and Louden, T. and Moyano, M. and Pollacco, D. and Poppenhaeger, K. and Rauer, H and Raynard, L. and Thompson, A. and Udry, S. and Watson, C. and Wheatley, P. (2017) Centroid vetting of transiting planet candidates from the Next Generation Transit Survey. Monthly Notices of the Royal Astronomical Society, 472, pp. 295-307. Oxford University Press. DOI: 10.1093/mnras/stx1920 ISSN 0035-8711

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Abstract

The Next Generation Transit Survey (NGTS), operating in Paranal since 2016, is a wide-field survey to detect Neptunes and super-Earths transiting bright stars, which are suitable for precise radial velocity follow-up and characterization. Thereby, its sub-mmag photometric precision and ability to identify false positives are crucial. Particularly, variable background objects blended in the photometric aperture frequently mimic Neptune-sized transits and are costly in follow-up time. These objects can best be identified with the centroiding technique: if the photometric flux is lost off-centre during an eclipse, the flux centroid shifts towards the centre of the target star. Although this method has successfully been employed by the Kepler mission, it has previously not been implemented from the ground. We present a fully automated centroid vetting algorithm developed for NGTS, enabled by our high-precision autoguiding. Our method allows detecting centroid shifts with an average precision of 0.75 milli-pixel (mpix), and down to 0.25 mpix for specific targets, for a pixel size of 4.97 arcsec. The algorithm is now part of the NGTS candidate vetting pipeline and automatically employed for all detected signals. Further, we develop a joint Bayesian fitting model for all photometric and centroid data, allowing to disentangle which object (target or background) is causing the signal, and what its astrophysical parameters are. We demonstrate our method on two NGTS objects of interest. These achievements make NGTS the first ground-based wide-field transit survey ever to successfully apply the centroiding technique for automated candidate vetting, enabling the production of a robust candidate list before follow-up.

Item URL in elib:https://elib.dlr.de/116411/
Document Type:Article
Title:Centroid vetting of transiting planet candidates from the Next Generation Transit Survey
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Günther, M.institute of astronomy, university of cambridge, united kingdomUNSPECIFIED
Queloz, D.observatoire de geneve, switzerlandUNSPECIFIED
Gillen, E.institute of astronomy, university of cambridge, united kingdomUNSPECIFIED
McCormac, Jastrophysics research centre, school of mathematics &UNSPECIFIED
Bayliss, D. D. R.research school of astronomy and astrophysics, australian national university, canberraUNSPECIFIED
Bouchy, F.laboratoire d'astrophysique de marseille, franceUNSPECIFIED
Walker, S.department of physics, university of warwick, ukUNSPECIFIED
West, R.european southern observatory, garching, germanyUNSPECIFIED
Eigmüller, Pphilipp.eigmueller (at) dlr.deUNSPECIFIED
Smith, A. M. S.alexis.smith (at) dlr.deUNSPECIFIED
Armstrong, D. J.university of warwick, department of physics, gibbet hill road, coventry, cv4 7al, ukUNSPECIFIED
Burleigh, M.department of physics, university of warwick, ukUNSPECIFIED
Casewell, Sdepartment of physics, university of warwick, ukUNSPECIFIED
Chaushev, A.dept. of physics and astronomy, university of leicester, united kingdomUNSPECIFIED
Goad, M.dept. of physics and astronomy, university of leicester, united kingdomUNSPECIFIED
Grange, A.dept. of physics and astronomy, university of leicester, united kingdomUNSPECIFIED
Jackman, J.department of physics, university of warwick, ukUNSPECIFIED
Jenkins, J.departamento de astronomía, universidad de chile, santiago, chileUNSPECIFIED
Louden, T.dept. of physics, university of warwick, united kingdomUNSPECIFIED
Moyano, M.aInstituto de Astronom��a, Universidad Cat�olica del Norte, ChileUNSPECIFIED
Pollacco, D.department of physics, university of warwick, coventry cv4 7al, ukUNSPECIFIED
Poppenhaeger, K.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN Belfast, UKUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, LE1 7RH, UKUNSPECIFIED
Thompson, A.astrophysics research centre, queens university belfast, united kingdomUNSPECIFIED
Udry, S.observatoire de genève, sauverny, switzerlandUNSPECIFIED
Watson, C.astrophysics research centre, queens university belfast, united kingdomUNSPECIFIED
Wheatley, P.dept. of physics, university of warwick, united kingdomUNSPECIFIED
Date:2017
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:472
DOI :10.1093/mnras/stx1920
Page Range:pp. 295-307
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:planets and satellites: detection, eclipses, occultations, surveys, (stars:) binaries: eclipsing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Project PLATO
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Stiebeler, Ulrike
Deposited On:30 Nov 2017 14:46
Last Modified:06 Sep 2019 15:17

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