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High-speed photometry of the disintegrating planetesimals at wd1145+017 : evidence for rapid dynamical evolution
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Gänsicke, B. T. (Boris T.), Aungwerojwit, A., Marsh, Tom, Dhillon, V. S., Sahman, D. I., Veras, Dimitri, Farihi, J., Chote, Paul, Ashley, R., Arjyotha, S., Rattanasoon, S., Littlefair, S. P., Pollacco, Don and Burleigh, Matthew R. (2016) High-speed photometry of the disintegrating planetesimals at wd1145+017 : evidence for rapid dynamical evolution. The Astrophysical Journal Letters, 818 (1). pp. 1-6. L7. doi:10.3847/2041-8205/818/1/L7
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Official URL: http://dx.doi.org/10.3847/2041-8205/818/1/L7
Abstract
We obtained high-speed photometry of the disintegrating planetesimals orbiting the white dwarf WD 1145+017, spanning a period of four weeks. The light curves show a dramatic evolution of the system since the first observations obtained about seven months ago. Multiple transit events are detected in every light curve, which have varying durations (sime3–12 minutes) and depths (sime10%–60%). The time-averaged extinction is sime11%, much higher than at the time of the Kepler observations. The shortest-duration transits require that the occulting cloud of debris has a few times the size of the white dwarf, longer events are often resolved into the superposition of several individual transits. The transits evolve on timescales of days, both in shape and in depth, with most of them gradually appearing and disappearing over the course of the observing campaign. Several transits can be tracked across multiple nights, all of them recur on periods of sime4.49 hr, indicating multiple planetary debris fragments on nearly identical orbits. Identifying the specific origin of these bodies within this planetary system, and the evolution leading to their current orbits remains a challenging problem.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Planetary systems, Asteroids, Light curves | ||||||||
| Journal or Publication Title: | The Astrophysical Journal Letters | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 3 February 2016 | ||||||||
| Dates: |
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| Volume: | 818 | ||||||||
| Number: | 1 | ||||||||
| Number of Pages: | 6 | ||||||||
| Page Range: | pp. 1-6 | ||||||||
| Article Number: | L7 | ||||||||
| DOI: | 10.3847/2041-8205/818/1/L7 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), Samnakngān Kō̜ngthun Sanapsanun Kānwičhai [Thailand Research Fund], Thailand. Samnakngān Khana Kammakān Wičhai hǣng Chāt [National Research Council of Thailand], Royal Society (Great Britain), Leverhulme Trust (LT), Science and Technology Facilities Council (Great Britain) (STFC) | ||||||||
| Grant number: | 320964 (ERC), MRG5680152 (SKSK), R2559B034 (SKKWgC), ST/L000733/1 (STFC) | ||||||||
| Adapted As: |
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