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  • Alonso, R.Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna,University of La Laguna (ULL) (author)

No random transits in CHEOPS observations of HD 139139 *,**

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:1b89abe9-6a21-431f-a01f-44b38bc8eda0
  • https://doi.org/10.1051/0004-6361/202347779DOI
  • https://research.chalmers.se/publication/539191URI
  • https://lup.lub.lu.se/record/240a9fed-f686-4158-a1c5-ebfea1a87e61URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context . The star HD 139139 (a.k.a. ‘the Random Transiter’) is a star that exhibited enigmatic transit-like features with no apparent periodicity in K2 data. The shallow depth of the events (-200 ppm - equivalent to transiting objects with radii of -1.5 R⊕ in front of a Sun-like star) and their non-periodicity constitute a challenge for the photometric follow-up of this star. Aims . The goal of this study is to confirm with independent measurements the presence of shallow, non-periodic transit-like features on this object. Methods . We performed observations with CHEOPS for a total accumulated time of 12.75 days, distributed in visits of roughly 20 h in two observing campaigns in years 2021 and 2022. The precision of the data is sufficient to detect 150 ppm features with durations longer than 1.5 h. We used the duration and times of the events seen in the K2 curve to estimate how many events should have been detected in our campaigns, under the assumption that their behaviour during the CHEOPS observations would be the same as in the K2 data of 2017. Results . We do not detect events with depths larger than 150 ppm in our data set. If the frequency, depth, and duration of the events were the same as in the K2 campaign, we estimate the probability of having missed all events due to our limited observing window would be 4.8%. Conclusions . We suggest three different scenarios to explain our results: 1) Our observing window was not long enough, and the events were missed with the estimated 4.8% probability. 2) The events recorded in the K2 observations were time critical, and the mechanism producing them was either not active in the 2021 and 2022 campaigns or created shallower events under our detectability level. 3) The enigmatic events in the K2 data are the result of an unidentified and infrequent instrumental noise in the original data set or its data treatment.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Hoyer, S.Laboratoire d'Astrophysique de Marseille (author)
  • Deleuil, M.Laboratoire d'Astrophysique de Marseille (author)
  • Simon, A.E.Universität Bern,University of Bern (author)
  • Davies, M.B.Lund University,Lunds universitet,Matematik (naturvetenskapliga fakulteten),Matematikcentrum,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematics (Faculty of Sciences),Centre for Mathematical Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)astr-mda (author)
  • Benz, W.Universität Bern,University of Bern (author)
  • Florén, H.-G.Stockholms universitet,Stockholm University (author)
  • Guterman, P.Laboratoire d'Astrophysique de Marseille (author)
  • Borsato, L.Istituto nazionale di astrofisica (INAF) (author)
  • Brandeker, A.Stockholms universitet,Stockholm University (author)
  • Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
  • Wilson, T.G.University of St Andrews (author)
  • Zingales, TizianoIstituto nazionale di astrofisica (INAF),Università Degli Studi di Padova,University of Padua (author)
  • Alibert, Y.Universität Bern,University of Bern (author)
  • Anglada, G.Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC),Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC (author)
  • Bárczy, T. (author)
  • Barrado Navascues, D.European Space Astronomy Centre (ESAC) (author)
  • Barros, S.C.C.Universidade do Porto,University of Porto (author)
  • Baumjohann, W. (author)
  • Beck, T.Universität Bern,University of Bern (author)
  • Billot, N.Université de Genève,University of Geneva (author)
  • Bonfils, X. (author)
  • Broeg, C.Universität Bern,University of Bern (author)
  • Charnoz, S.Institut de Physique du Globe de Paris (author)
  • Collier Cameron, A.University of St Andrews (author)
  • Van Damme, C. CorralEuropean Space Research and Technology Centre (ESA ESTEC) (author)
  • Csizmadia, SzilardDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Cubillos, P. E.Istituto nazionale di astrofisica (INAF) (author)
  • Davies, M.B.Lunds universitet,Lund University (author)
  • Deline, A.Université de Genève,University of Geneva (author)
  • Delrez, L.Universite de Liège,University of Liège (author)
  • Demangeon, O.Universidade do Porto,University of Porto (author)
  • Demory, B.O.Universität Bern,University of Bern (author)
  • Ehrenreich, D.Université de Genève,University of Geneva (author)
  • Erikson, AndersDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Fortier, A.Universität Bern,University of Bern (author)
  • Fossati, L. (author)
  • Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)(Swepub:cth)malfri (author)
  • Gillon, MichaëlUniversite de Liège,University of Liège (author)
  • Gudel, M.Universität Wien,University of Vienna (author)
  • Günther, Maximilian N.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Heitzmann, A.Université de Genève,University of Geneva (author)
  • Helling, Ch.Technische Universität Graz (author)
  • Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Kiss, L.Eötvös Loránd University (ELTE),Magyar Tudomanyos Akademia,Hungarian Academy of Sciences (author)
  • Kopp, E.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Lam, K. W.F.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Laskar, J.Observatoire de Paris,Paris Observatory (author)
  • des Etangs, A. L.Institut d 'Astrophysique de Paris (author)
  • Lendl, M.Université de Genève,University of Geneva (author)
  • Magrin, D.Istituto nazionale di astrofisica (INAF) (author)
  • Maxted, P.Keele University (author)
  • Mordasini, C.Universität Bern,University of Bern (author)
  • Nascimbeni, ValerioIstituto nazionale di astrofisica (INAF) (author)
  • Olofsson, G.Stockholms universitet,Stockholm University (author)
  • Ottensamer, R.Universität Wien,University of Vienna (author)
  • Pagano, I.Istituto nazionale di astrofisica (INAF) (author)
  • Palle, EnricInstituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna (author)
  • Peter, G.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Piotto, Giampaolo P.Istituto nazionale di astrofisica (INAF),Università Degli Studi di Padova,University of Padua (author)
  • Pollacco, Don L.The University of Warwick (author)
  • Queloz, D.Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH),University Of Cambridge (author)
  • Ragazzoni, R.Istituto nazionale di astrofisica (INAF),Università Degli Studi di Padova,University of Padua (author)
  • Rando, N.European Space Research and Technology Centre (ESA ESTEC) (author)
  • Rauer, H.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Freie Universität Berlin,Technische Universität Berlin (author)
  • Ribas, I.Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC),Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC (author)
  • Santos, N. C.Universidade do Porto,University of Porto (author)
  • Scandariato, GaetanoIstituto nazionale di astrofisica (INAF) (author)
  • Segransan, D.Université de Genève,University of Geneva (author)
  • Smith, A. M.S.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Sousa, S.G.Universidade do Porto,University of Porto (author)
  • Stalport, M.Universite de Liège,University of Liège (author)
  • Szabó, G.M.Eötvös Loránd University (ELTE) (author)
  • Thomas, NicolasUniversität Bern,University of Bern (author)
  • Udry, S.Université de Genève,University of Geneva (author)
  • Ulmer, B.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
  • Van Grootel, V.Universite de Liège,University of Liège (author)
  • Venturini, J.Université de Genève,University of Geneva (author)
  • Verrecchia, F.Osservatorio Astronomico di Roma,Agenzia Spaziale Italiana,Italian Space Agency (author)
  • Walton, N. A.University Of Cambridge,University of Cambridge (author)
  • Instituto de Astrofísica de CanariasUniversidad de la Laguna (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics6800004-63611432-0746

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