Deep long asymmetric occultation in EPIC 204376071

S. Rappaport, G. Zhou, A. Vanderburg, A. Mann, M. H. Kristiansen, K. Oláh, T. L. Jacobs, E. Newton, M. R. Omohundro, D. LaCourse, H. M. Schwengeler, I. A. Terentev, D. W. Latham, A. Bieryla, M. Soares-Furtado, L. G. Bouma, M. J. Ireland, J. Irwin

Research output: Contribution to journalArticle

Abstract

We have discovered a young M star of mass 0.16 M and radius 0.63 R, likely in the Upper Sco Association, that exhibits only a single 80 per cent deep occultation of 1-d duration. The star has frequent flares and a low-amplitude rotational modulation, but is otherwise quiet over 160 d of cumulative observation during K2 campaigns C2 and C15. We discuss how such a deep eclipse is not possible by one star crossing another in any binary or higher order stellar system in which no mass transfer has occurred. The two possible explanations we are left with are (1) orbiting dust or small particles (e.g. a disc bound to a smaller orbiting body, or unbound dust that emanates from such a body); or (2) a transient accretion event of dusty material near the corotation radius of the star. In either case, the time between such occultation events must be longer than ∼80 d. We model a possible orbiting occulter both as a uniform elliptically shaped surface (e.g. an inclined circular disc) and as a 'dust sheet' with a gradient of optical depth behind its leading edge. The required masses in such dust features are then 3 × 1019 g and 1019 g, for the two cases, respectively.

Original languageEnglish
Pages (from-to)2681-2693
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number2
DOIs
Publication statusPublished - Feb 15 2019

Fingerprint

occultation
dust
stars
corotation
M stars
stellar systems
radii
eclipses
leading edges
optical thickness
optical depth
flares
mass transfer
accretion
modulation
gradients

Keywords

  • Stars: flare
  • Stars: late-type
  • Stars: low-mass
  • Stars: pre-main-sequence
  • Stars: starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rappaport, S., Zhou, G., Vanderburg, A., Mann, A., Kristiansen, M. H., Oláh, K., ... Irwin, J. (2019). Deep long asymmetric occultation in EPIC 204376071. Monthly Notices of the Royal Astronomical Society, 485(2), 2681-2693. https://doi.org/10.1093/mnras/stz537

Deep long asymmetric occultation in EPIC 204376071. / Rappaport, S.; Zhou, G.; Vanderburg, A.; Mann, A.; Kristiansen, M. H.; Oláh, K.; Jacobs, T. L.; Newton, E.; Omohundro, M. R.; LaCourse, D.; Schwengeler, H. M.; Terentev, I. A.; Latham, D. W.; Bieryla, A.; Soares-Furtado, M.; Bouma, L. G.; Ireland, M. J.; Irwin, J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, No. 2, 15.02.2019, p. 2681-2693.

Research output: Contribution to journalArticle

Rappaport, S, Zhou, G, Vanderburg, A, Mann, A, Kristiansen, MH, Oláh, K, Jacobs, TL, Newton, E, Omohundro, MR, LaCourse, D, Schwengeler, HM, Terentev, IA, Latham, DW, Bieryla, A, Soares-Furtado, M, Bouma, LG, Ireland, MJ & Irwin, J 2019, 'Deep long asymmetric occultation in EPIC 204376071', Monthly Notices of the Royal Astronomical Society, vol. 485, no. 2, pp. 2681-2693. https://doi.org/10.1093/mnras/stz537
Rappaport S, Zhou G, Vanderburg A, Mann A, Kristiansen MH, Oláh K et al. Deep long asymmetric occultation in EPIC 204376071. Monthly Notices of the Royal Astronomical Society. 2019 Feb 15;485(2):2681-2693. https://doi.org/10.1093/mnras/stz537
Rappaport, S. ; Zhou, G. ; Vanderburg, A. ; Mann, A. ; Kristiansen, M. H. ; Oláh, K. ; Jacobs, T. L. ; Newton, E. ; Omohundro, M. R. ; LaCourse, D. ; Schwengeler, H. M. ; Terentev, I. A. ; Latham, D. W. ; Bieryla, A. ; Soares-Furtado, M. ; Bouma, L. G. ; Ireland, M. J. ; Irwin, J. / Deep long asymmetric occultation in EPIC 204376071. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 485, No. 2. pp. 2681-2693.
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AU - Zhou, G.

AU - Vanderburg, A.

AU - Mann, A.

AU - Kristiansen, M. H.

AU - Oláh, K.

AU - Jacobs, T. L.

AU - Newton, E.

AU - Omohundro, M. R.

AU - LaCourse, D.

AU - Schwengeler, H. M.

AU - Terentev, I. A.

AU - Latham, D. W.

AU - Bieryla, A.

AU - Soares-Furtado, M.

AU - Bouma, L. G.

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AU - Irwin, J.

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