Mobil im Netz

Croll, Jutta

doi:10.37307/j.2366-2913.2016.02.10

Cited by 2 publications

(5 citation statements)

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“…Most brown dwarfs monitored to date show an evolution of their light curve. The 6 yr-monitoring of SIMP 0136 showed that its peak-topeak amplitude varied between ∼ 2% to more than 10% (Metchev et al 2013;Croll et al 2016). Observations of 2MASS J2139 also suggest an evolution of its light curve over periods of several weeks (Radigan et al 2012).…”

Section: VI Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi ...mentioning

confidence: 95%

“…It has been previously demonstrated in large-sample surveys (Girardin et al 2013;Radigan 2014;Radigan et al 2014;Wilson et al 2014;Metchev et al 2015) that, as suggested by atmosphere models (Showman & Kaspi 2013), a significant fraction of field brown dwarfs display largeamplitude photometric variations in the infrared, especially at the L/T transition. Notable examples in-*Corresponding author: naud@astro.umontreal.ca clude SIMP J013656.57+093347.3 (SIMP 0136 hereafter), a T2.5 isolated object 1 that has been shown to display a J-band variation up to 6% peak-to-peak over a period of 2.4 hr (Artigau et al 2009;Apai et al 2013;Metchev et al 2013;Croll et al 2016), 2MASS J21392676+0220226 (2MASS J2139 hereafter), a T1.5 displaying a peak-to-peak variability as large as 26% in J band over 7.7 hr (Radigan et al 2012); and WISE J104915.57-531906.1 (Luhman 16B), a T0.5 that shows a > 10% peak-to-peak amplitude variability with a ∼ 5 hr period in the near-infrared (Gillon et al 2013;Burgasser et al 2014;Buenzli et al 2015). The cooler T6.5 2MASS J22282889431026 (2M 2228 hereafter; Buenzli et al 2012) shows rapid variability (period 1.4 hr) in the near-and mid-infrared bands with peak-to-peak amplitudes ranging from 1.45% to 5.3%.…”

Section: Introductionmentioning

confidence: 99%

“…Variability in T dwarfs was also detected on longer timescales of days to months for most isolated objects studied over such long periods. SIMP 0136 is an extreme example with a peak-to-peak amplitude varying between less than 1% to more than 6% over the 6 years it was studied (Artigau et al 2009;Apai et al 2013;Metchev et al 2013;Croll et al 2016). The evolution of variability is thought to be due to large-scale evolution of weather patterns on the surface.…”

Section: Introductionmentioning

confidence: 99%

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A Search for Photometric Variability in the Young T3.5 Planetary-mass Companion GU Psc b

Naud¹,

Artigau²,

Rowe³

et al. 2017

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We present a photometric J-band variability study of GU Psc b, a T3.5 co-moving planetary-mass companion (9-13 M Jup ) to a young (∼ 150 Myr) M3 member of the AB Doradus Moving Group. The large separation between GU Psc b and its host star (42 ) provides a rare opportunity to study the photometric variability of a planetary-mass companion. The study presented here is based on observations obtained from 2013 to 2014 over three nights with durations of 5-6 hr each with the WIRCam imager at Canada-France-Hawaii Telescope. Photometric variability with a peak-to-peak amplitude of 4 ± 1% at a timescale of ∼ 6 hr was marginally detected on 2014 October 11. No highsignificance variability was detected on 2013 December 22 and 2014 October 10. The amplitude and timescale of the variability seen here, as well as its evolving nature, is comparable to what was observed for a variety of field T dwarfs and suggests that mechanisms invoked to explain brown dwarf variability may be applicable to low-gravity objects such as GU Psc b. Rotation-induced photometric variability due to the formation and dissipation of atmospheric features such as clouds is a plausible hypothesis for the tentative variation detected here. Additional photometric measurements, particularly on longer timescales, will be required to confirm and characterize the variability of GU Psc b, determine its periodicity and to potentially measure its rotation period.

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Section: VI Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi Vi ...mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Search for Photometric Variability in the Young T3.5 Planetary-mass Companion GU Psc b

Naud¹,

Artigau²,

Rowe³

et al. 2017

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“…Engineering Materials and their Application Cross-cut Adhesion Result. Adhesion is one of crucial testing because it is an indicator on the integrity of the coatings [1]. The result adhesion tape showed an improvement of the adhesion strength.…”

Section: Resultsmentioning

confidence: 98%

“…Corrosion can be occurred from two way of coating failure which is insufficient thickness and defect or damage of the coating that exposed the metal to corrosive environment [1]. The primer which is first layer applied to the metal substrate is to provide a better surface, improve interaction and also act as anti-corrosion barrier [2].…”

Section: Introductionmentioning

confidence: 99%

Study of Unsaturated Polyester Primer Reinforced by Microcrystalline Cellulose on Mechanical, Adhesion and Corrosion Properties

Baharudin

Ahmad

Sarip

et al. 2023

MSF

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Addition of Microcrystalline Cellulose (MCC) as filler in to Unsaturated Polyester (UPR) polymer can enhanced the properties of the composite. UPR and MCC was prepared using sonication mixing technique at various loading of (2, 4, 6, 8, and 10 wt %) of MCC at a constant of 60 minutes of sonication. UPR and MCC was mixed in a vial bottle and then immersed in sonication bath for the sonication process. Once the sonication completed, the mixture was added with Methyl Ethylene Ketone Peroxide (MEKP) as curing agent, coated on steel plate and was left for curing process of 7 days. The coating was studied for adhesion, mechanical and corrosive properties using pencil hardness, adhesion tape and immersion tests. 4 wt% of loading showed improvement in mechanical properties where form H grade to 4H grade. It is also recorded there are improvement of adhesion test from 1B grade 35-65% pulled out to 4B grade which is less than 5 % pulled. From the immersion test, it shown that 4 wt % of loading has a good corrosion resistant as compared to the control sample. Thus, it was concluded that 4 wt % of loading filler is suitable to be used because it promotes a better mechanical and adhesion properties and also good corrosion resistant compared to other loading percentage.

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Mobil im Netz

Cited by 2 publications

References 0 publications

A Search for Photometric Variability in the Young T3.5 Planetary-mass Companion GU Psc b

A Search for Photometric Variability in the Young T3.5 Planetary-mass Companion GU Psc b

Study of Unsaturated Polyester Primer Reinforced by Microcrystalline Cellulose on Mechanical, Adhesion and Corrosion Properties

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