Explore further Image credit: NHK / AGU A sprightly explanation for UFO sightings? PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Play Video credit: NHK / AGU Scientists still don’t know much about them, though theories regarding their origin abound. One that seems plausible is that when lightening with a positive charge occurs, surrounding clouds are drained of a positive charge, leaving them with a net negative charge, which could lead to an electrical field building up between the clouds and the upper atmosphere; when it reaches a certain point, sprites and elves appear. What’s also unclear is whether sprites and elves have any impact on weather, or if they just exist for moment, then disappear; ghostly bright apparitions one moment, gone the next without a trace. In the language of those studying the phenomenon, sprites are the part of the lightening that resemble jellyfish and travel downwards after starting out as a ball shape. Elves are the halos that create the eerie effects. Both are reddish in color and last for something like 10 milliseconds.The video was captured by a research team funded by the Japanese Broadcasting Corporation. Two jets flying over parts of the south-west United States this past summer, with cameras aboard, were used for filming to create the 3D effect and the results were presented at the American Geophysical Union Conference last week. In some respects, the images produced by the research team look like fireworks, creating jellyfish type patterns far above the thunderstorms below that are thought to spawn them. In others, they appear almost liquid in their fluidity. And even though they are way up there, some fifty miles from the ground, they can still be seen, as they are frequently brighter than Venus in the night sky, though doubtless most who have seen them, didn’t know they did, as they would have existed among regular storm cloud activity. Sort of like sprites and elves of lore. (PhysOrg.com) — Sometimes in science, it’s easy to get caught up in the practical, to focus so heavily on the why’s and how’s of things, that it’s easy to miss the simple beauty that nature offers. That might be the case with a little known type of lightening that occurs between the part of the atmosphere where weather events are seen quite easily, and the far reaches near the beginning of space. Called sprites, these other kinds of lightening strikes are of far shorter duration than we’re accustomed to; it wasn’t until just the past thirty years or so that anyone even knew they existed. So odd were they, that pilots flying at high altitudes who saw them feared for their jobs if they spoke of them. Now however a research team has captured some instances of them using high speed cameras mounted on two jets to create 3D images. Citation: Upper atmospheric lightening sprites caught in 3D video (2011, December 9) retrieved 18 August 2019 from https://phys.org/news/2011-12-upper-atmospheric-sprites-caught-3d.html © 2011 PhysOrg.com This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
(Phys.org)—Astronomers have detected a new “hot Jupiter” exoplanet orbiting a nearby T Tauri star known as TAP 26. The newly detected alien world, designated TAP 26 b, is about 66 percent more massive than Jupiter and is orbiting its parent star approximately every 10 days. The findings were presented in a paper published Jan. 6 on arXiv.org. Astronomers discover a dense ‘hot Jupiter’ exoplanet orbiting a sun-like star Located some 480 light years away, TAP 26 belongs to the T Tauri class of variable pre-main-sequence stars. With a mass similar to that of the sun, TAP 26 has a radius of 1.17 solar radii and is about 17 million years old. Such young forming T Tauri stars could provide important information about the formation and early evolution of planetary systems. Therefore, detecting “hot Jupiters” around these objects and determining their orbital properties could help astronomers to understand how they form and migrate, offering crucial insights on physical processes responsible for generating such planets.With this aim in mind, a team of astronomers led by Louise Yu of the Toulouse University in France, has observed TAP 26 between November 2015 and January 2016 using the the 3.6-meter Canada-France-Hawaii Telescope (CFHT) in Hawaii. The observational campaign, which utilized CFHT’s Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS), was carried out under the Magnetic Topologies of Young Stars and the Survival of close-in massive Exoplanets (MaTYSSE) program.By implementing three different methods, the researchers managed to detect a planet radial velocity signal in TAP 26’s spectrum. The discovery is based on the analysis of 29 unpolarised and circularly polarised spectra collected over a timespan of 72 days.”We report the detection of a hot Jupiter around TAP 26 using three different methods, two using Zeeman-Doppler Imaging (ZDI) and one Gaussian-Process Regression (GPR), with a false-alarm probability smaller than 6 10−4,” the paper reads.According to the research, the newly detected planet has a mass of 1.66 Jupiter masses and is circling its parent star at a distance of nearly 0.1 AU. With its short orbital period, huge mass and proximity to its host star, TAP 26 b was classified as a “hot Jupiter.” The so-called “hot Jupiters” are gas giant planets, similar in characteristics to the solar system’s biggest planet, with orbital periods not longer than 10 days. They have high surface temperatures, as they orbit their parent stars very closely.More detailed characteristics of TAP 26 b are expected to be determined by further observations, in particular including more regular temporal sampling.Besides deriving fundamental parameters of the newly detected planet, the researchers also revealed some important insights on the nature of the host star. According to the paper, the team created surface brightness and magnetic maps of TAP 26, revealing the presence of cool spots and warm plages totaling up to 12 percent of the stellar surface. They found that the star’s photospheric temperature is about 4,620 K and its maximum V magnitude is equal to 12.16. Moreover, based on the observational data, the scientists assume that TAP 26 dissipated its accretion disc very early and its magnetic field started to evolve into a complex topology. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. © 2017 Phys.org More information: A hot Jupiter around the very active weak-line T Tauri star TAP 26, arXiv:1701.01512 [astro-ph.SR] arxiv.org/abs/1701.01512AbstractWe report the results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star TAP 26, carried out within the MaTYSSE programme with the ESPaDOnS spectropolarimeter at the 3.6 m Canada-France-Hawaii Telescope. Applying Zeeman-Doppler Imaging to our observations, concentrating in 2015 November and 2016 January and spanning 72 d in total, 16 d in 2015 November and 13 d in 2016 January, we reconstruct surface brightness and magnetic field maps for both epochs and demonstrate that both distributions exhibit temporal evolution not explained by differential rotation alone. We report the detection of a hot Jupiter (hJ) around TAP 26 using three different methods, two using Zeeman-Doppler Imaging (ZDI) and one Gaussian-Process Regression (GPR), with a false-alarm probability smaller than 6.10^-4. However, as a result of the aliasing related to the observing window, the orbital period cannot be uniquely determined; the orbital period with highest likelihood is 10.79 +/- 0.14 d followed by 8.99 +/- 0.09 d. Assuming the most likely period, and that the planet orbits in the stellar equatorial plane, we obtain that the planet has a minimum mass M.sin(i) of 1.66 +/- 0.31 M_Jup and orbits at 0.0968 +/- 0.0032 au from its host star. This new detection suggests that disc type II migration is efficient at generating newborn hJs, and that hJs may be more frequent around young T Tauri stars than around mature stars (or that the MaTYSSE sample is biased towards hJ-hosting stars). Artist’s impression of a “hot Jupiter”. Credit: Ricardo Cardoso Reis (CAUP) Citation: ‘Hot Jupiter’ detected around nearby variable star (2017, January 12) retrieved 18 August 2019 from https://phys.org/news/2017-01-hot-jupiter-nearby-variable-star.html Explore further
© 2018 Phys.org This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Earlier this summer, the International Commission on Stratigraphy announced that a new geological time category had been approved. The Meghalayan Age covers the time span from 2200 BCE up till the present. Prior to this summer, it had been generally referred to as the late Holocene period. The group chose the starting point of the age as approximately 4200 years ago because prior evidence has shown that was the beginning of a mega-drought. Middleton does not dispute this claim, but focuses on other statements made by members of the group that proposed the change. In their presentation, they noted that the mega-drought resulted in the collapse of a number of civilizations—in Greece, Mesopotamia, Syria, Egypt, Palestine, the Yangtze River Valley and the Indus Valley. This last one was particularly significant because the new age was named for a state in what is now India—Meghalaya. Middleton claims that there is no real evidence of mass civilizations collapsing. He suggests that at most, there was restructuring of several societies due to the drought. He further suggests that because of this inaccuracy, it is inappropriate to use the date chosen as a meaningful threshold for a new geologic age. He adds that he believes that such errors crop up due to a lack of communication between archaeologists and historians—a problem that could be solved with more interdisciplinary collaborations.Such statements have angered some of the people who proposed the labeling of the new age, according to Robinson Meyer, in a column for The Atlantic. He claims a squabble has arisen due to the piece Middleton published. He writes that some of the Meghalayan group have even gone so far as to question Middleton’s credentials, calling him a “failed archeology Ph.D.” Others have suggested that the claims by Middleton were poorly researched and are misleading. Citation: Historian angers group who proposed labeling late Holocene as Meghalayan Age (2018, September 21) retrieved 18 August 2019 from https://phys.org/news/2018-09-historian-angers-group-late-holocene.html Credit: CC0 Public Domain Guy Middleton, a historian at the Czech Institute of Egyptology at Charles University in Prague, has angered members of the group who successfully pushed for the creation of a new unit of geological time called the Meghalayan Age. In his Perspective piece published in the journal Science, he claims that evidence of widespread collapse of civilizations following the onset of a mega-drought in 2200 BCE, is lacking.
Love Korean films? Here’s something you should not miss! The Korean Cultural Centre, India in association with Cinedarbaar is organising Korean Cine Experience 2013 at the Korean Cultural Centre.The festival is a treat for cinephiles which will bring the best of the Korean cinema, from auteur driven cinema to popular gangster movies genre to romantic drama to documentaries. The opening film of the festival is Barking Dogs Never Bite by Joon-Ho Bong, starring: Doona Bae, Sung-jae Lee, Hie-bong Byeon. Also Read – ‘Playing Jojo was emotionally exhausting’Korean Cine Experience 2013 also marks the culmination of Indo-Korean 40th Diplomatic Year celebrations.For the past decade, the Korean film industry has enjoyed a renaissance and gained immense popularity in the pop culture. With innovative storytelling and visceral effects, Korean films not only have been commercially viable in the domestic and regional markets but also have appealed to cinephiles everywhere in the international festival circuit. This event is the rarest of the opportunity for the Indian audience to enjoy the Korean movies under a single roof. Also Read – Leslie doing new comedy special with NetflixKorean Gangster movies have gained immense popularity and many Korean films have been adapted in Hollywood productions. This festival will explore this genre through three films naming Breathless by IK-Joon Yang, Rough Cut by Hun Jang and Show Must Go On by Jae-Rim Han.The three-day long festival will showcase seven films to celebrate Korean Cinema. All films will be followed by an interactive sessions to explore the themes and styles of different auteurs and quizzes and exciting prizes will be given away. A session called Indian remakes of Korean films is a session about Indian films ‘inspired by’ or ‘based on’ Korean films, the legalities of this practice and how they are adapted for Indian audiences. Focus will be on films like: Zinda – Remake of Old Boy, Ugly aur Pagli – Remake of My Sassy Girl, Awarapan – Remake of A Bittersweet Life. The entry to the festival is free and is on first come first serve basis. There is also Hello Hangul, a Korean Calligraphy Exhibition by calligraphy artist Hyung Byung Chan at the Korean Cultural Centre.Korean calligraphy is a unique cultural heritage which has taken several leaps over the period of time. Hangul is often evaluated as the most scientific language which is easy to learn.This exhibition is organised by the ‘Sejong Korean Calligraphers Association’, an association of calligraphy masters who have devoted their life to Korean calligraphy. The exhibition presents various facets of Korean Calligraphy evolved in present day Korea from ancient calligraphic styles, which is an amalgamation of both traditional and contemporary forms. The contents are mainly quotes or poems of renowned people of the past which also includes those written by the great Indian poet Rabindranath Tagore.When: Movie screenings: 6 Dec (6:30pm), 7 and 8 Dec (12:30 pm); Exhibition: On till 30 DecemberWhere: Korean Cultural Centre, Lajpat Nagar
The festival aims to celebrate womanhood in all its facets and bring city’s strong and independent women together at one platform. 23-year-old young entrepreneur Akshuna Bakshi organised the first edition of the festival in Feb 2013.The festival will also highlight the cause of girl child education, welfare, women safety, and various other causes by organizing entertaining but thoughtful activities. Exciting self defence workshops- An exclusive self-defence workshop teaching the basics of martial arts and key moves to protect one if attacked on the road, bus etc. will be a major highlight of the event. Colourful dance and music performances on women, eclectic art and poetry installations, a special ‘SHE Says’ corner, funky photo booths and makeover tents will be some of the many attractions. Also Read – ‘Playing Jojo was emotionally exhausting’The festival will host over 70 women entrepreneurs and designers (pass outs from prestigious design institutes like NID, NIFT, Pearl) who will showcase unique collections of apparel, jewellery, accessories, handicrafts, vintage and kitsch products, décor etc. that will be up for sale.Through this edition of the festival, Travelista will also be supporting and displaying the works of one of India’s leading NGO Shiksha Bharati which has been working tirelessly for the past 25 years to provide a better future and education to thousands of underprivileged young girls. Some of these young girls will also be performing a martial arts demo and traditional folk dances during the festival. Head over!
Kolkata: Criticising the move of Left Front calling a six-hour bandh on Friday, Chief Minister Mamata Banerjee has once again attacked the party, saying that it has been sold to BJP.Banerjee took a dig at the Left, saying that from the next time they will call bandh at midnight and stated it to be “bandh freedom at midnight”.While leaving Nabanna on Thursday evening, the Chief Minister said: “Can there be any bandh from 6 am to 12 noon? Next they will give a call for a bandh from midnight to 4 am and it will be observed in sleep. This is their (CPI-M) future and they have no capability to work in the grassroot level. ‘Harmads’ of CPI-M have now become the ‘ostads’ of BJP. The party has been sold to BJP. So it is not right to expect anything from them.”She maintained: “Offices open at 10 am…they have called bandh at such a time that it is nothing but drama. Such drama will not be tolerated. They have caused enough damage to the state by giving call for bandhs.””The bandh will become 100 percent successful if they give a call for the same at midnight,” the Chief Minister said.
India-born ex-Goldman Sachs director Rajat Gupta’s conviction on insider trading charges should not be thrown out as the government provided “overwhelming” proof against him for passing on illegal information in return for “expected potential pecuniary gains,” US prosecutors said. The prosecutors said the IIT and Harvard-educated former McKinsey head, who is serving a two-year sentence, had a “powerful” financial incentive to tip his billionaire hedge-fund operator friend Raj Rajaratnam. Also Read – I-T issues 17-point checklist to trace unaccounted DeMO cashAttorney for the Southern District of New York Preet Bharara submitted a memorandum on behalf of the government opposing Gupta’s plea to throw out his conviction based on a recent ruling by an appeals court in which it reversed the insider convictions of hedge-fund managers Todd Newman and Anthony Chiasson. Convicted in 2012, Gupta, 66, began serving a two-year prison term on insider trading charges in June, 2014. He was also fined $5 million.Stressing that the personal aspect of Gupta-Rajaratnam relationship was “undeniable,” the government said Gupta personally invested in Galleon and participated in several actual and contemplated ventures with him. Also Read – Lanka launches ambitious tourism programme to woo Indian tourists“In sum, Gupta’s financial interests were heavily aligned with Galleon’s. Rajaratnam bestowed corporate titles on Gupta, gave him an ongoing financial interest in Galleon International… and generally granted Gupta a level of access and corporate prestige that Gupta craved.“As part of their business relationship, each had shared expectations. Rajaratnam expected, and Gupta consistently delivered, inside information that Gupta possessed as a corporate insider. For those tips, Gupta clearly expected potential pecuniary gain in return,” the prosecutors said.