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dc.contributor.authorGünther, Maximilian Nen
dc.contributor.authorQueloz, Didieren
dc.contributor.authorGillen, Edwarden
dc.contributor.authorDelrez, Laetitiaen
dc.contributor.authorBouchy, Françoisen
dc.contributor.authorMcCormac, Jamesen
dc.contributor.authorSmalley, Barryen
dc.contributor.authorAlmleaky, Yaseenen
dc.contributor.authorArmstrong, David Jen
dc.contributor.authorBayliss, Danielen
dc.contributor.authorBurdanov, Artemen
dc.contributor.authorBurleigh, Matthewen
dc.contributor.authorCabrera, Juanen
dc.contributor.authorCasewell, Sarah Len
dc.contributor.authorCooke, Benjamin Fen
dc.contributor.authorCsizmadia, Szilárden
dc.contributor.authorDucrot, Elsaen
dc.contributor.authorEigmüller, Philippen
dc.contributor.authorErikson, Andersen
dc.contributor.authorGänsicke, Boris Ten
dc.contributor.authorGibson, Neale Pen
dc.contributor.authorGillon, Michaëlen
dc.contributor.authorGoad, Michael Ren
dc.contributor.authorJehin, Emmanuëlen
dc.contributor.authorJenkins, James Sen
dc.contributor.authorLouden, Tomen
dc.contributor.authorMoyano, Maximilianoen
dc.contributor.authorMurray, Catrionaen
dc.contributor.authorPollacco, Donen
dc.contributor.authorPoppenhaeger, Katjaen
dc.contributor.authorRauer, Heikeen
dc.contributor.authorRaynard, Liamen
dc.contributor.authorSmith, Alexis MSen
dc.contributor.authorSohy, Sandrineen
dc.contributor.authorThompson, Samanthaen
dc.contributor.authorUdry, Stéphaneen
dc.contributor.authorWatson, Christopher Aen
dc.contributor.authorWest, Richard Gen
dc.contributor.authorWheatley, Peter Jen
dc.date.accessioned2019-01-10T00:30:40Z
dc.date.available2019-01-10T00:30:40Z
dc.date.issued2018-08-21en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/287749
dc.description.abstractWe present the discovery of NGTS-3Ab, a hot Jupiter found transiting the primary star of an unresolved binary system. We develop a joint analysis of multi-colour photometry, centroids, radial velocity (RV) cross-correlation function (CCF) profiles and their bisector inverse slopes (BIS) to disentangle this three-body system. Data from the Next Generation Transit Survey (NGTS), SPECULOOS and HARPS are analysed and modelled with our new blendfitter software. We find that the binary consists of NGTS-3A (G6V-dwarf) and NGTS-3B (K1V-dwarf) at <1 arcsec separation. NGTS-3Ab orbits every P = 1.675 days. The planet radius and mass are R_planet = 1.48+-0.37 R_J and M_planet = 2.38+-0.26 M_J, suggesting it is potentially inflated. We emphasise that only combining all the information from multi-colour photometry, centroids and RV CCF profiles can resolve systems like NGTS-3. Such systems cannot be disentangled from single-colour photometry and RV measurements alone. Importantly, the presence of a BIS correlation indicates a blend scenario, but is not sufficient to determine which star is orbited by the third body. Moreover, even if no BIS correlation is detected, a blend scenario cannot be ruled out without further information. The choice of methodology for calculating the BIS can influence the measured significance of its correlation. The presented findings are crucial to consider for wide-field transit surveys, which require wide CCD pixels (>5 arcsec) and are prone to contamination by blended objects. With TESS on the horizon, it is pivotal for the candidate vetting to incorporate all available follow-up information from multi-colour photometry and RV CCF profiles.
dc.languageenen
dc.publisherOxford University Press
dc.rightsAll rights reserved
dc.rights.uri
dc.titleUnmasking the hidden NGTS-3Ab: a hot Jupiter in an unresolved binary systemen
dc.typeArticle
prism.endingPage4737
prism.issueIdentifier4en
prism.publicationDate2018en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage4720
prism.volume478en
dc.identifier.doi10.17863/CAM.35065
dcterms.dateAccepted2018-05-03en
rioxxterms.versionofrecord10.1093/mnras/sty1193en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-08-21en
dc.contributor.orcidQueloz, Didier [0000-0002-3012-0316]
dc.contributor.orcidArmstrong, David J [0000-0002-5080-4117]
dc.contributor.orcidBayliss, Daniel [0000-0001-6023-1335]
dc.contributor.orcidGibson, Neale P [0000-0002-9308-2353]
dc.contributor.orcidPoppenhaeger, Katja [0000-0003-1231-2194]
dc.contributor.orcidWheatley, Peter J [0000-0003-1452-2240]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2018-05-07en


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