J/ApJ/818/L7 High-speed photometry obs. of WD 1145+017 syst. (Gansicke+, 2016)
High-speed photometry of the disintegrating planetesimals at WD1145+017:
evidence for rapid dynamical evolution.
Gansicke B.T., Aungwerojwit A., Marsh T.R., Dhillon V.S., Sahman D.I.,
Veras D., Farihi J., Chote P., Ashley R., Arjyotha S., Rattanasoon S.,
Littlefair S.P., Pollacco D., Burleigh M.R.
<Astrophys. J., 818, L7 (2016)>
=2016ApJ...818L...7G 2016ApJ...818L...7G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Minor planets
Keywords: minor planets, asteroids: general; planetary systems;
stars: individual: WD 1145+017
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
(~=3-12 minutes) and depths (~=10%-60%). The time-averaged extinction
is ~=11%, 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 ~=4.49hr, 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.
Description:
We obtained high-speed photometry with the frame-transfer camera
ULTRASPEC mounted on the 2.4m Thai National Telescope (TNT) on Doi
Inthanon over eleven nights in between 2015, November 28, and December
22.
Additional observations were obtained on 2015, December 17, 23-25,
using the Warwick 1m (W1m) telescope at the Roque de Los Muchachos
Observatory on La Palma.
Objects:
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RA (ICRS) DE Designation(s)
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11 48 33.63 +01 28 59.4 WD 1145+017 = EPIC 201563164
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 209 15 Observation log
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
J/MNRAS/452/765 : WD candidates using LAMOST DR3 (Gentile Fusillo+, 2015)
J/MNRAS/449/574 : Circumstellar discs at white dwarfs (Rocchetto+, 2015)
J/MNRAS/448/2260 : White dwarf candidates in SDSS DR10 (Gentile Fusillo+, 2015)
J/other/Nat/481.167 : 2002-2007 PLANET microlensing events (Assan+, 2012)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
J/A+A/363/1040 : DB WDs from the Hamburg/ESO survey (Friedrich+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "Y:M:D" Date Observation date
12- 24 A13 --- Inst Instrument/Telescope Used (1)
26- 29 I4 --- N [292/9183] Number of Images obtained
31- 34 F4.1 s Exp [0.8/34] Individual Exposure time
36- 40 F5.1 min Dur [40/235] Total duration of observation
42-209 A168 --- Comm Comments on observation
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Note (1): Instrument/Telescope Used
TNT/ULTRASPEC = ULTRASPEC camera on the 2.4m Thai National Telescope (TNT),
Doi Inthanon
W1m = Warwick 1m telescope at the Roque de Los Muchachos Observatory, La Palma
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2016