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Published December 1, 2016 | Published + Submitted
Journal Article Open

The peculiar dipping events in the disc-bearing young-stellar object EPIC 204278916

Abstract

EPIC 204278916 has been serendipitously discovered from its K2 light curve that displays irregular dimmings of up to 65 per cent for ≈25 consecutive days out of 78.8 d of observations. For the remaining duration of the observations, the variability is highly periodic and attributed to stellar rotation. The star is a young, low-mass (M-type) pre-main-sequence star with clear evidence of a resolved tilted disc from Atacama Large Millimeter/submillimeter Array (ALMA) observations. We examine the K2 light curve in detail and hypothesize that the irregular dimmings are caused by either a warped inner disc edge or transiting cometary-like objects in either circular or eccentric orbits. The explanations discussed here are particularly relevant for other recently discovered young objects with similar absorption dips.

Additional Information

© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 August 23. Received 2016 August 19. In original form 2016 July 15. First published online August 26, 2016. We gratefully thank the anonymous referee for providing useful and insightful comments which have improved this manuscript. SS acknowledges funding from the Alexander von Humboldt Foundation. CFM acknowledges ESA research fellowship funding. This research has made use of NASA's Astrophysics Data System Bibliographic Services. Additionally, this work acknowledges the use of the astronomy and astrophysics package for matlab (Ofek 2014). This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission Directorate. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX13AC07G and by other grants and contracts. This paper additionally makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00395.S. ALMA is a partnership of European Southern Observatory (ESO, representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469.

Attached Files

Published - MNRAS-2016-Scaringi-2265-72.pdf

Submitted - 1608.07291v1.pdf

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Additional details

Created:
August 19, 2023
Modified:
October 23, 2023