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

Abstract

EPIC 204278916 has been serendipitously discovered from its K2 light curve which displays irregular dimmings of up to 65% for ~25 consecutive days out of 78.8 days 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 disk from ALMA observations. We examine the K2 light curve in detail and hypothesise that the irregular dimmings are caused by either a warped inner-disk 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.

arXiv comment9 pages, 10 figures. Accepted for publication in MNRAS

References in corpus (25)

• Astrophysics Source Code Library
• A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
• Timescale of Mass Accretion in Pre-Main-Sequence Stars
• CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability
• ALMA Observations of Circumstellar Disks in the Upper Scorpius OB Association
• Planet Hunters X. KIC 8462852 - Where's the Flux?
• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• The Disk Population of the Upper Scorpius Association
• Accretion dynamics and disk evolution in NGC 2264: a study based on the Corot photometric observations
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• Planetary Construction Zones in Occultation: Discovery of an Extrasolar Ring System Transiting a Young Sun-like Star and Future Prospects for Detecting Eclipses by Circumsecondary and Circumplanetary Disks
• CSI 2264: Probing the inner disks of AA Tau-like systems in NGC 2264
• Modeling giant extrasolar ring systems in eclipse and the case of J1407b: sculpting by exomoons?
• The Role of Mass and Environment in Multiple Star Formation: A 2MASS Survey of Wide Multiplicity in Three Young Associations
• Accretion-induced variability links young stellar objects, white dwarfs, and black holes
• KIC 8462852: Transit of a Large Comet Family
• Dippers and Dusty Disks Edges: A Unified Model
• Dipper disks not inclined towards edge-on orbits
• CSI 2264: Accretion process in classical T Tauri stars in the young cluster NGC 2264
• KIC 8462852 - The Infrared Flux
• Mass and period limits on the ringed companion transiting the young star J1407
• Investigating the rotational evolution of young, low mass stars using Monte Carlo simulations
• Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association
• Sco X-1 revisited with Kepler, MAXI and HERMES: outflows, time-lags and echoes unveiled

Cited by in corpus (20)

• The many-faceted light curves of young disk-bearing stars in Upper Sco and $\rho$ Oph observed by $K2$ Campaign 2
• Variable Outer Disk Shadowing Around the Dipper Star RX J1604.3-2130
• New Young Stars and Brown Dwarfs in the Upper Scorpius Association
• Violent environment of the inner disk of RW Aur A probed by the 2010 and 2015 dimming events
• Identification of Young Stellar Variables with KELT for K2 I: Campaign 13 Taurus Dippers and Rotators
• Propagating mass accretion rate fluctuations in X-ray binaries under the influence of viscous diffusion
• New exocomets of $\beta$ Pic
• Star-disk interactions in multi-band photometric monitoring of the classical T Tauri star GI Tau
• Multi-epoch monitoring of the AA Tau like star V354 Mon - Indications for a low gas-to-dust ratio in the inner disk warp
• The Little Dippers: Transits of Star-grazing Exocomets?
• Identification of Young Stellar Variables with KELT for K2 II: The Upper Scorpius Association
• The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO): IV. Dust and Gas Disk Properties in the Upper Scorpius Star-forming Region
• VVV-WIT-08: the giant star that blinked
• Millimeter Observations of the disk around GW Ori
• The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic
• Sudden extreme obscuration of a Sun-like main-sequence star: evolution of the circumstellar dust around ASASSN-21qj
• ISO-ChaI 52: a weakly-accreting young stellar object with a dipper light curve
• The High Rate of the Boyajian's Star Anomaly as a Phenomenon
• High-resolution spectroscopy of Boyajian's star during optical dimming events
• $COD:$ An Algorithm for Shape Reconstruction of Transiting Celestial Bodies through Topological Optimization