Astronomers find exoplanet with cloud-free atmosphere
London, May 8: Astronomers have found that a planet outside our solar system, which is similar to Saturn in mass and exceeds the size of Jupiter by 20 per cent, has an atmosphere free of clouds.
The hot gas giant, WASP-96b, periodically transits a Sun-like star 980 light years away in the southern constellation Phoenix.
Using the the European Southern Observatory's Very Large Telescope in Chile, the team studied the atmosphere of WASP-96b when the planet passed in front of its host-star.
This enabled the team to measure the decrease of starlight caused by the planet and its atmosphere, and thereby determine the planet's atmospheric composition.
"We've been looking at more than twenty exoplanet transit spectra. WASP-96b is the only exoplanet that appears to be entirely cloud-free and shows such a clear sodium signature, making the planet a benchmark for characterisation," said lead author of the study Nikolay Nikolov from University of Exeter in Britain.
Just like an individual's fingerprints are unique, atoms and molecules have a unique spectral characteristic that can be used to detect their presence in celestial objects.
The spectrum of WASP-96b shows the complete fingerprint of sodium, which can only be observed for an atmosphere free of clouds, according to the study published in the journal Nature.
It has long been predicted that sodium exists in the atmospheres of hot gas-giant exoplanets, and in a cloud-free atmosphere it would produce spectra that are similar in shape to the profile of a camping tent.
"Until now, sodium was revealed either as a very narrow peak or found to be completely missing. This is because the characteristic 'tent-shaped' profile can only be produced deep in the atmosphere of the planet and for most planet clouds appear to get in the way," Nikolov added.
Clouds and hazes are known to exist in some of the hottest and coldest solar system planets and exoplanets.
The presence or absence of clouds and their ability to block light plays an important role in the overall energy budget of planetary atmospheres.
"It is difficult to predict which of these hot atmospheres will have thick clouds. By seeing the full range of possible atmospheres, from very cloudy to nearly cloud-free like WASP-96b, we'll gain a better understanding of what these clouds are made of," explains study co-author Jonathan Fortney, Professor at University of California, Santa Cruz (UCSC), US.
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BCB official calling Tamim 'an Indian agent' invites wrath of Bangladesh players
Dhaka (PTI): A senior Bangladesh Cricket Board (BCB) official calling former captain Tamim Iqbal "an Indian agent" has not gone down well with the players in the country.
Tamim, one of the finest openers to have come out of Bangladesh, had advised the BCB to not be driven by emotion while deciding the way forward on the national team's participation in the T20 World Cup in India.
Nazmul, chairman of BCB finance committee, called the left-hander opener "an Indian agent" in a Facebook post.
"This time, the people of Bangladesh witnessed, with their own eyes, the emergence of yet another proven Indian agent," he wrote.
The post received immediate backlash from former and current cricketers, including Taskin Ahmed, Momimul Haque and Taijul Islam.
Even the Cricketers' Welfare Association of Bangladesh (CWAB) expressed shock at Nazmul's comments.
"A comment made by BCB director M Nazmul Islam regarding former national captain Tamim Iqbal has come to the attention of the Cricketers' Welfare Association of Bangladesh. We are stunned, shocked, and outraged by it.
"Such a remark by a board official about the most successful opener in Bangladesh's history, who represented the country for 16 years, is utterly condemnable.
"Not only because it concerns a player like Tamim, but such comments about any cricketer of the country are unacceptable and insulting to the entire cricketing community," the players' body said in a statement.
The 36-year-old Tamim played 70 Tests, 243 ODIs and 78 T20 Internationals for his country in a fairly accomplished career.
"We strongly protest against this comment. When a responsible board director makes such remarks on a public platform, it also raises serious questions about the code of conduct of board officials," it said.
"We have already submitted a protest letter to the BCB president, demanding a public apology from the concerned board director and that he be brought under accountability. We hope the BCB president will take appropriate action as soon as possible," CWAB added.
Bangladesh wrote to the International Cricket Council to move their T20 World Cup games out of India after the BCCI instructed IPL franchise KKR to release Mustafizur Rahman ahead of the 2026 edition without giving a specific reason.
"Cricket is the life of Bangladesh. A recent comment surrounding a former national captain who has made a major contribution to the game has caused many to reflect," said pacer Taskin.
"I believe that such remarks directed at a former cricketer of the country are not helpful in the interest of Bangladesh cricket. I hope the concerned authorities will consider the matter seriously and adopt a more responsible stance in the future," he said.
Mominul added: "The comment made by BCB director M Nazmul Islam regarding former national captain Tamim Iqbal is completely unacceptable and insulting to the country's cricketing community. Such behaviour towards a cricketer is in direct conflict with the board's responsibility and ethics," said Mominul.
"A senior cricketer was not given even the minimum respect; instead, he was deliberately humiliated in public. Such remarks show a lack of even basic decorum regarding where and how to speak while holding such a high responsibility.
"I strongly condemn this comment and firmly demand a public apology from the concerned director and that he be brought under accountability. I call upon the BCB to take swift and strict action," said Mominul.
