ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope

Dhillon, V. S.; Marsh, T. R.; Atkinson, David; Bezawada, Naidu; Bours, Madelon C. P.; Copperwheat, C. M.; Gamble, T.; Hardy, L. K.; Hickman, Richard; Irawati, P.; Ives, Derek; Kerry, P.; Leckngam, Apichat; Littlefair, S. P.; McLay, Stewart; O’Brien, Kieran; Peacocke, P. T.; Poshyachinda, S.; Richichi, A.; Soonthornthum, Boonrucksar; Vick, Andrew

doi:10.1093/mnras/stu1660

Cited by 67 publications

(43 citation statements)

References 23 publications

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“…We obtained high-speed photometry with the frame-transfer camera ULTRASPEC (Dhillon et al 2014) mounted on the 2.4 m Thai National Telescope (TNT) on Doi Inthanon over eleven nights in between 2015, November 28, and December 22. We used a KG5 short-pass filter which cuts off red light beyond 7000 Å, and exposure times of three to eight seconds, with 15 ms dead time between exposures.…”

Section: Observationsmentioning

confidence: 99%

High-Speed Photometry of the Disintegrating Planetesimals at Wd1145+017: Evidence for Rapid Dynamical Evolution

Gänsicke

Aungwerojwit

Marsh

et al. 2016

ApJL

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141

146

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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 ;4.49 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.

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Section: Observationsmentioning

confidence: 99%

High-Speed Photometry of the Disintegrating Planetesimals at Wd1145+017: Evidence for Rapid Dynamical Evolution

Gänsicke

Aungwerojwit

Marsh

et al. 2016

ApJL

Self Cite

141

146

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“…If eclipses were seen and a period could be measured, we then observed the systems at high time resolution (few seconds) using either ULTRACAM on the WHT (Dhillon et al 2007) or ULTRASPEC on the 2.4 m Thai National Telescope (TNT, Dhillon et al 2014). Both are imagers utilizing frame-transfer CCDs for high cadence, low dead-time (of order 10 ms) observations.…”

Section: O B S E Rvat I O N Smentioning

confidence: 99%

“…Transmission as a function of wavelength for the five SDSS filters and the KG5 filter used in ULTRASPEC. Castelli & Kurucz 2004), and we had already produced a throughput model for ULTRASPEC in order to quantify the performance of the instrument during commissioning (Dhillon et al 2014). Our model for the system includes the throughput of the atmosphere, telescope mirrors, instrument lenses and adhesives, the filters themselves, and the quantum efficiency of the detector.…”

Section: A P P E N D I X a : C A L I B R At I N G T H E Kg5 F I Lt E Rmentioning

confidence: 99%

Hunting for eclipses: high-speed observations of cataclysmic variables

Hardy

McAllister

Dhillon

et al. 2016

Mon. Not. R. Astron. Soc.

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“…In this work, we analyse the data using differential photometry with ULTRASPEC (Dhillon et al 2014) and IRAF software and we model the binaries system using Binary Maker 3 (see Figure 2 and Figure 3). …”

Section: Discussionmentioning

confidence: 99%

Nalysis of the Eclipsing Binary SDSS J1021+1744: A WDMS System With Unusual Dips

Chanthorn¹,

Sanguansak²,

Irawati³

et al. 2015

Publications of The Korean Astronomical Society

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We present our recent observations of SDSS J102102.25+174439.9, a new eclipsing white dwarf -main sequence WDMS binary with an orbital period of 0.14 days. This system belongs to the post commonenvelope binary group as shown by the spectrum from the Sloan Digital Sky Survey. We obtained our data using the ULTRASPEC instrument installed on the 2.4-m telescope at the Thai National Observatory (TNO). Our multi-band observations reveal an unusual and persistent drop in brightness after the primary eclipse. These dips, which appear to show variations in amplitude, also have a complex shape that changes within days. Dips in WDMS systems have been observed on only one other occasion, in the light curve of QS Vir prior to the eclipse of the white dwarf. The dips in SDSS J1021+1744 are unique because they are present at different wavelengths and they occur approximately at similar phases. Hosting a DA white dwarf and an M4 companion star, this system is known to be the only WDMS to show these kind of dips in its light curve. It is possible that these dips are caused by ejected materials from an active companion star, such as in QS Vir. The light curve in the g filter exhibits deep and narrow features, implying that the material which passes in front of the white dwarf in SDSS J1021 must be dense and small in size. Furthermore, we try to constrain the stellar and orbital parameters of SDSS J1021+1744 using the Binary Maker 3 software. We use g and r data for our light curve analysis to have a better approximation for the red dwarf star.

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ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope

Cited by 67 publications

References 23 publications

High-Speed Photometry of the Disintegrating Planetesimals at Wd1145+017: Evidence for Rapid Dynamical Evolution

High-Speed Photometry of the Disintegrating Planetesimals at Wd1145+017: Evidence for Rapid Dynamical Evolution

Hunting for eclipses: high-speed observations of cataclysmic variables

Nalysis of the Eclipsing Binary SDSS J1021+1744: A WDMS System With Unusual Dips

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