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The planets around NN Serpentis : still there
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Marsh, Tom, Parsons, S. G., Bours, Madelon C. P., Littlefair, Stuart P., Copperwheat, Chris M., Dhillon, Vik S., Breedt, E., Caceres, Claudio and Schreiber, M. R. (2014) The planets around NN Serpentis : still there. Monthly Notices of the Royal Astronomical Society, Volume 437 (Number 1). pp. 475-488. doi:10.1093/mnras/stt1903 ISSN 0035-8711.
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WRAP_MNRAS-2014-Marsh-475-88.pdf - Published Version Available under License Creative Commons Attribution. Download (2527Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stt1903
Abstract
We present 25 new eclipse times of the white dwarf binary NN Ser taken with the high-speed camera ULTRACAM on the William Herschel Telescope and New Technology Telescope, the RISE camera on the Liverpool Telescope and HAWK-I on the Very Large Telescope to test the two-planet model proposed to explain variations in its eclipse times measured over the last 25 yr. The planetary model survives the test with flying colours, correctly predicting a progressive lag in eclipse times of 36 s that has set in since 2010 compared to the previous 8 yr of precise times. Allowing both orbits to be eccentric, we find orbital periods of 7.9 ± 0.5 and 15.3 ± 0.3 yr, and masses of 2.3 ± 0.5 and 7.3 ± 0.3 MJ. We also find dynamically long-lived orbits consistent with the data, associated with 2:1 and 5:2 period ratios. The data scatter by 0.07 s relative to the best-fitting model, by some margin the most precise of any of the proposed eclipsing compact object planet hosts. Despite the high precision, degeneracy in the orbit fits prevents a significant measurement of a period change of the binary and of N-body effects. Finally, we point out a major flaw with a previous dynamical stability analysis of NN Ser, and by extension, with a number of analyses of similar systems.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Library of Congress Subject Headings (LCSH): | Eclipses, White dwarf stars, Double stars | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 1 January 2014 | ||||||||||
Dates: |
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Volume: | Volume 437 | ||||||||||
Number: | Number 1 | ||||||||||
Page Range: | pp. 475-488 | ||||||||||
DOI: | 10.1093/mnras/stt1903 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 26 December 2015 | ||||||||||
Date of first compliant Open Access: | 26 December 2015 | ||||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), European Southern Observatory (ESO), Chile, Millennium Science Initiative, Chile. Ministerio de Economía, Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) | ||||||||||
Grant number: | ST/F002599/1 ; Nucleus P10-022-F (MSI) ; 31100025 (CONICYT) |
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