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Low-gravity L Dwarfs Are Likely More Variable.
- Source :
- Proceedings of the International Astronomical Union; Nov2015 Supplement, Vol. 10 Issue S314, p121-123, 3p
- Publication Year :
- 2015
-
Abstract
- In the "Weather on Other Worlds" Spitzer Exploration Science program, we surveyed 44 nearby L3-T8 dwarfs for spot-induced rotational variability. Among single L3-L9.5 dwarfs, we found that 80% are variable at >0.2% in the 3-5 µm wavelength range, while 36% of T0-T8 were variable at >0.4%. Taking into account viewing angle and sensitivity considerations, both of these findings are consistent with spots being present on ~100% of L3-T8 dwarfs. Intriguingly, we find a tentative association (92% confidence) between low surface gravity and high-amplitude variability among L3-L5.5 dwarfs. Although we can not confirm whether lower gravity is also correlated with a higher incidence of variables, the result is promising for the characterization of directly imaged young extrasolar planets through variability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17439213
- Volume :
- 10
- Issue :
- S314
- Database :
- Complementary Index
- Journal :
- Proceedings of the International Astronomical Union
- Publication Type :
- Academic Journal
- Accession number :
- 112671470
- Full Text :
- https://doi.org/10.1017/S1743921315006523