The Random Transiter - EPIC 249706694/HD 139139

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

Documents

DOI

  • Author: Rappaport, S.

    Massachusetts Institute of Technology, United States

  • Author: Vanderburg, A.

    University of Texas at Austin, United States

  • Author: Kristiansen, M. H.

    National Space Institute, Technical University of Denmark, Elektrovej, building 327+328 ; Ørsted Plads, building 348 ; Richard Petersens Plads, building 305, DK-2800, Kgs. Lyngby, Denmark

  • Author: Omohundro, M. R.

    University of Oxford, United Kingdom

  • Author: Schwengeler, H. M.

    University of Oxford, United Kingdom

  • Author: Terentev, I. A.

    University of Oxford, United Kingdom

  • Author: Dai, You-Fen

    Massachusetts Institute of Technology, United Kingdom

  • Author: Masuda, K.

    Princeton University, United States

  • Author: Jacobs, T. L.

    University of Oxford, United Kingdom

  • Author: LaCourse, D.

    University of Oxford, United Kingdom

  • Author: Latham, D. W.

    Harvard-Smithsonian Center for Astrophysics, United States

  • Author: Bieryla, A.

    Harvard-Smithsonian Center for Astrophysics, United States

  • Author: Hedges, C. L.

    NASA Ames Research Center, United States

  • Author: Dittmann, Jason A.

    Massachusetts Institute of Technology, United States

  • Author: Barentsen, Geert

    NASA Ames Research Center, United States

  • Author: Cochran, W. D.

    University of Texas at Austin, United States

  • Author: Endl, M

    University of Texas at Austin, United States

  • Author: Jenkins, M. J.

    NASA Ames Research Center, United States

  • Author: Mann, P. A.

    University of North Carolina at Chapel Hill, United States

View graph of relations

We have identified a star, EPIC 249706694 (HD 139139), that was observed during K2 Campaign 15 with the Kepler extended mission that appears to exhibit 28 transit-like events over the course of the 87-d observation. The unusual aspect of these dips, all but two of which have depths of 200 +/- 80 ppm, is that they exhibit no periodicity, and their arrival times could just as well have been produced by a random number generator. We show that no more than four of the events can be part of a periodic sequence. We have done a number of data quality tests to ascertain that these dips are of astrophysical origin, and while we cannot be absolutely certain that this is so, they have all the hallmarks of astrophysical variability on one of two possible host stars (a likely bound pair) in the photometric aperture. We explore a number of ideas for the origin of these dips, including actual planet transits due to multiple or dust emitting planets, anomalously large TTVs, S-and P-type transits in binary systems, a collection of dust-emitting asteroids, 'dipper-star' activity, and short-lived starspots. All transit scenarios that we have been able to conjure up appear to fail, while the intrinsic stellar variability hypothesis would be novel and untested.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume488
Issue number2
Pages (from-to)2455-2465
ISSN0035-8711
DOIs
Publication statusPublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Stars: activity, Circumstellar matter, Stars: general, Planets and satellites: general.

Download statistics

No data available

ID: 192642320