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Discovery of New Dipper Stars with K2: A Window into the Inner Disk Region of T Tauri Stars
- Publication Year :
- 2018
- Publisher :
- arXiv, 2018.
-
Abstract
- In recent years a new class of Young Stellar Object has been defined, referred to as dippers, where large transient drops in flux are observed. These dips are too large to be attributed to stellar variability, last from hours to days and can reduce the flux of a star by 10-50\%. This variability has been attributed to occultations by warps or accretion columns near the inner edge of circumstellar disks. Here we present 95 dippers in the Upper Scorpius association and $\rho$ Ophiuchus cloud complex found in K2 Campaign 2 data using supervised machine learning with a Random Forest classifier. We also present 30 YSOs that exhibit brightening events on the order of days, known as bursters. Not all dippers and bursters are known members, but all exhibit infrared excesses and are consistent with belonging to either of the two young star forming regions. We find 21.0 $\pm$ 5.5\% of stars with disks are dippers for both regions combined. Our entire dipper sample consists only of late-type (KM) stars, but we show that biases limit dipper discovery for earlier spectral types. Using the dipper properties as a proxy, we find that the temperature at the inner disk edge is consistent with interferometric results for similar and earlier type stars.<br />Comment: 34 Pages, 21 Figures
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
biology
Dipper
Young stellar object
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
biology.organism_classification
Stellar classification
01 natural sciences
Stars
T Tauri star
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
0103 physical sciences
Ophiuchus
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
QB
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 13652966
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....d60ae198712ccc3fe1606bef63852992
- Full Text :
- https://doi.org/10.48550/arxiv.1802.00409