Luna, GJM;
Mukai, K;
Sokoloski, JL;
Nelson, T;
Kuin, P;
Segreto, A;
Cusumano, G;
... Nuñez, NE; + view all
(2018)
Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis.
Astronomy and Astrophysics
, 619
, Article A61. 10.1051/0004-6361/201833747.
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Abstract
A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope (BAT)/X-Ray Telescope (XRT)/UltraViolet Optical Telescope (UVOT), and the American Association of Variable Stars Observers (AAVSO) V- and B-band data indicates that during an optical brightening event that started in early 2014 (ΔV ≈ 1.5) the following occurred: (i) the hard X-ray emission as seen with BAT almost vanished; (ii) the XRT X-ray flux decreased significantly, while the optical flux remained high; (iii) the UV flux increased by at least a factor of 40 over the quiescent value; and (iv) the X-ray spectrum became much softer and a bright, new blackbody-like component appeared. We suggest that the optical brightening event, which could be a similar event to that observed about 8 years before the most recent thermonuclear outburst in 1946, is due to a disk instability.
| Type: | Article |
|---|---|
| Title: | Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201833747 |
| Publisher version: | http://doi.org/10.1051/0004-6361/201833747 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10062686 |
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