期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 445, 期 2, 页码 1878-1884出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1876
关键词
circumstellar matter; stars: individual: SDSS J1617+1620; planetary systems; white dwarfs
资金
- ERC [320964]
- UK's Science and Technology Facilities Council [ST/I001719/1]
- European Research Council (ERC) [320964] Funding Source: European Research Council (ERC)
- Science and Technology Facilities Council [ST/H005307/1] Funding Source: researchfish
- STFC [ST/H005307/1] Funding Source: UKRI
We present the discovery of strongly variable emission lines from a gaseous disc around the DA white dwarf SDSS J1617+1620, a star previously found to have an infrared excess indicative of a dusty debris disc formed by the tidal disruption of a rocky planetary body. Time series spectroscopy obtained during the period 2006-2014 has shown the appearance of strong double-peaked Ca II emission lines in 2008. The lines were weak, at best, during earlier observations, and monotonically faded through the remainder of our monitoring. Our observations represent unambiguous evidence for short-term variability in the debris environment of evolved planetary systems. Possible explanations for this extraordinary variability include the impact on to the dusty disc of either a single small rocky planetesimal, or of material from a highly eccentric debris tail. The increase in flux from the emission lines is sufficient that similar events could be detected in the broad-band photometry of ongoing and future large-area time domain surveys.
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