DM Ori: A Young Star Occulted by a Disturbance in its Protoplanetary Disk

Abstract

In some planet formation theories, protoplanets grow gravitationally within a young star's protoplanetary disk, a signature of which may be a localized disturbance in the disk's radial and/or vertical structure. Using time-series photometric observations by the Kilodegree Extremely Little Telescope South (KELT-South) project and the All-Sky Automated Survey for SuperNovae (ASAS-SN), combined with archival observations, we present the discovery of two extended dimming events of the young star, DM Ori. This young system faded by $\sim$1.5 mag from 2000 March to 2002 August and then again in 2013 January until 2014 September (depth $\sim$1.7 mag). We constrain the duration of the 2000-2002 dimming to be $<$ 860 days, and the event in 2013-2014 to be $<$ 585 days, separated by $\sim$12.5 years. A model of the spectral energy distribution (SED) indicates a large infrared excess consistent with an extensive circumstellar disk. Using basic kinematic arguments, we propose that DM Ori is likely being periodically occulted by a feature (possibly a warp or perturbation) in its circumstellar disk. In this scenario, the occulting feature is located $>$6 AU from the host star, moving at $\sim$14.6 km/s, and is $\sim$4.9 AU in width. This localized structure may indicate a disturbance such as may be caused by a protoplanet early in its formation.

arXiv comment9 pages, 4 figures, 1 table, Accepted for publication in ApJ

References in corpus (31)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• The Dartmouth Stellar Evolution Database
• First Results from the Catalina Real-time Transient Survey
• Las Cumbres Observatory Global Telescope Network
• Northern Sky Variability Survey (NSVS): Public data release
• Effects of Dust Growth and Settling in T Tauri Disks
• 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
• The Wide Field Spectrograph (WiFeS)
• KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• YSOVAR: the first sensitive, wide-area, mid-IR photometric monitoring of the ONC
• Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars
• An Infrared/X-ray Survey for New Members of the Taurus Star-Forming Region
• The KELT-South Telescope
• AA Tau's sudden and long-lasting deepening: enhanced extinction by its circumstellar disk
• Explaining UXOR variability with self-shadowed disks
• Young Stellar Object Variability (YSOVAR): Long Timescale Variations in the Mid-Infrared
• Dynamics of Circumstellar Disks II: Heating and Cooling
• Infrared Variability of Evolved Protoplanetary Disks: Evidence for Scale Height Variations in the Inner Disk
• Occultation of the T Tauri Star RW Aurigae A by its Tidally Disrupted Disk
• New Silhouette Disks with Reflection Nebulae and Outflows in the Orion Nebula and M43
• KELT-10b: The First Transiting Exoplanet from the KELT-South Survey -- A Hot Sub-Jupiter Transiting a V = 10.7 Early G-Star
• Another deep dimming of the classical T Tauri star RW Aur A
• An Extreme Analogue of $\epsilon$ Aurigae: An M-giant Eclipsed Every 69 Years by a Large Opaque Disk Surrounding a Small Hot Source
• Magnetic Accretion and Photopolarimetric Variability in Classical T Tauri Stars
• V409 Tau As Another AA Tau: Photometric Observations of Stellar Occultations by the Circumstellar Disk
• Recurring Occultations of RW Aurigae by Coagulated Dust in the Tidally Disrupted Circumstellar Disk
• Testing Disk-Locking in NGC 2264
• The Transitional Disk around IRAS 04125+2902
• Young Stellar Object candidates toward the Orion region selected from GALEX

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• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Identification of Young Stellar Variables with KELT for K2 I: Campaign 13 Taurus Dippers and Rotators
• The Mysterious Dimmings of the T Tauri Star V1334 Tau
• Periodic Eclipses of the Young Star PDS 110 Discovered with WASP and KELT Photometry
• The ASAS-SN Catalog of Variable Stars VIII: "Dipper" Stars in the Lupus Star-Forming Region
• Inhomogeneous dust eclipses in young stars. The case of CQ Tauri
• KELT: The Kilodegree Extremely Little Telescope, a Survey for Exoplanets Transiting Bright, Hot Stars
• Synergies between Exoplanet Surveys and Variable Star Research
• The nature of ASASSN-24fw's occultation: modelling the event as dimming by optically thick rings around a sub-stellar companion