Variable emission from a gaseous disc around a metal-polluted white dwarf

被引：77

作者：

Wilson, D. J. ^{[1
]}

Gaensicke, B. T. ^{[1
]}

Koester, D. ^{[2
]}

Raddi, R. ^{[1
]}

Breedt, E. ^{[1
]}

Southworth, J. ^{[3
]}

Parsons, S. G. ^{[4
]}

机构：

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[2] Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany

[3] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[4] Univ Valparaso, Dept Fs & Astron, Valparaiso 2360102, Chile

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 02期

基金：

英国科学技术设施理事会; 欧洲研究理事会;

关键词：

circumstellar matter; stars: individual: SDSS J1617+1620; planetary systems; white dwarfs; DIGITAL SKY SURVEY; EXTRASOLAR MINOR PLANET; FINAL MASS RELATION; DATA RELEASE; DEBRIS DISKS; GALEX J193156.8+011745; CHEMICAL-COMPOSITION; INFRARED EXCESS; BROWN DWARF; ACCRETION;

D O I：

10.1093/mnras/stu1876

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1878 / 1884

页数：7

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