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Posts Tagged ‘hr 8799

[BLOG] Some Sunday links

  • Bad Astronomy’s Phil Plait notes the first time that an exoplanet, HR 8799e, has been directly observed using optical interferometry.
  • Centauri Dreams notes the possibility, demonstrated by the glimpsing of a circumplanetary disc around exoplanet PDS 70b, that we might be seeing a moon system in formation.
  • The Citizen Science Salon looks what observers in Antarctica are contributing to our wealth of scientific knowledge.
  • The Dragon’s Tales shares links to articles looking at the latest findings on the Precambrian Earth.
  • The Frailest Thing’s L.M. Sacasas writes about his ambivalent response to a Twitter that, by its popularity, undermines the open web.
  • Gizmodo notes that NASA is going to open up the International Space Station to tourists.
  • JSTOR Daily looks at how croquet, upon its introduction in the 19th century United States, was seen as scandalous for the way it allowed men and women to mix freely.
  • Shakezula at Lawyers, Guns and Money notes the unaccountable fondness of at least two Maine Republican legislators for the Confederacy.
  • Marginal Revolution suggests that the economic success of Israel in recent decades is a triumph of neoliberalism.
  • Stephen Ellis at the NYR Daily writes about the gymnastics of Willem de Kooning.
  • Drew Rowsome profiles out comic Brendan D’Souza.
  • Starts With A Bang’s Ethan Siegel looks at the still strange galaxy NGC 1052-DF2, apparently devoid of dark matter.
  • John Scalzi at Whatever shares his theory about a fixed quantity of flavor in strawberries of different sizes.
  • Window on Eurasia looks at a contentious plan for a territorial swap between Armenia and Azerbaijan.

[BLOG] Some Sunday links

  • Centauri Dreams notes the remarkable imaging of the atmosphere of HR 8799 e.
  • Crooked Timber starts a discussion about books that, once picked up, turned out to be as good as promised.
  • The Crux considers obsidian, known in the Game of Thrones world as dragonglass.
  • Bruce Dorminey notes that NASA is considering a proposal for a floating Venus probe that would be recharged by microwaves from orbit.</li.
  • The Dragon’s Tales shares a report that Russia has developed a new satellite to work with a new anti-satellite weapons system.
  • Far Outliers notes what U.S. Grant learned from the Mexican-American War, as a strategist and as a politician.
  • L.M. Sacasas at The Frailest Thing suggests, drawing from the image of M87*, that we have had a world disenchanted by the digital technology used to produce the image.
  • JSTOR Daily shares what critical theory has to say about the binge-watching of television.
  • Language Hat notes the Cherokee-language inscriptions on the wall of Manitou Cave.
  • Language Log considers when the first conversing automaton was built.
  • Lawyers, Guns and Money takes a look at a corner of 1970s feminism forgotten despite its innovative ideas.
  • Marginal Revolution considers the idea of restricting some new migrants to particular regions of the United States.
  • The NYR Daily explores the important new work by Igiaba Scego, Beyond Babylon.
  • Starts With A Bang’s Ethan Siegel answers a surprisingly complex question: What is an electron?
  • Window on Eurasia explains why the cost of a professional military means Russia will not abandon the draft.
  • Arnold Zwicky explores “johnson” as a euphemism for penis.

[BLOG] Some Thursday links

  • At Anthro{dendum}, Travis Cooper shares thoughts o what should be kept in mind in studying new media.
  • Bad Astronomer Phil Plait notes a new plan to catalogue a hundred thousand stellar nurseries in nearby galaxies.
  • Centauri Dreams notes the very unusual lightcurve of the star VVV-WIT-07.
  • D-Brief considers the possible role of climate change in undermining Byzantium.
  • Gizmodo reports on how astronomers managed to directly image exoplanet HR8799e, a young hot Jupiter some 130 light-years away.
  • JSTOR Daily examines the lynchings inflicted on people of Mexican background in the conquered American West after the Mexican-American War.
  • Marginal Revolution considers the possibility that homo sapiens might trace its ancestry to hominid populations in southern Africa.
  • Noahpinion features a guest post from Roy Bahat arguing that Uber and Lyft need to change their treatment of their workers for their own good.
  • The NYR Daily features an article by Zia Haider Rahman talking about the many ways in which British identity has mutated after Brexit.
  • The Planetary Society Blog features some photos taken by the Beresheet probe on its way to the Moon.
  • Drew Rowsome reviews the Greg Scarnici book Dungeons & Drag Queens, a funny take on Fire Island.
  • Starts With A Bang’s Ethan Siegel notes the early Solar System, when a still energetic Mars existed alongside Earth as a life-supporting planet. (Venus, not so much. Perhaps?)
  • Daniel Little writes at Understanding Society about his new book project, a social ontology of government.
  • Window on Eurasia notes how Russia is dropping off sharply in importance as a trading partner for most post-Soviet states.

[BLOG] Some Monday links

  • The Broadside Blog’s Caitlin Kelly writes about the importance of truth in journalism.
  • Crooked Timber looks at the example of Trump and wonders why that kind of charismatic authoritarianism is popular.
  • The Dragon’s Gaze links to a model of the inner debris disk of HR 8799.
  • Far Outliers looks at the cultural divergences between North and South Koreans.
  • Language Hat looks at the complexities of translating the obscenities of the Marquis de Sade.
  • Lawyers, Guns and Money looks at the collapse of unions and makes a limited defense of Castro.
  • Marginal Revolution links to a plan in the United States to make social science research more productive.
  • The NYRB Daily shares Masha Gessen’s article talking about the hard choices she had to make in Putin’s Russia and their relevance to the United States.
  • Window on Eurasia argues that Russia’s Ukrainian policy may be self-destructive.

[BLOG] Some Friday links

  • blogTO writes about the impending installation of snooze stations across Toronto.
  • Centauri Dreams considers the astrobiological implications of stromatolites.
  • D-Brief notes that Titan has methane-flooded canyons.
  • The Dragon’s Gaze looks at the Kepler-444 system and notes studies of HR 8799.
  • The Dragon’s Tales notes an assassination attempt against a Donbas leader, and notes dinosaurs probably had colour vision.
  • The Everyday Sociology Blog considers the workplace culture of Amazon.
  • Language Log looks at a mangled translation of South Asian languages into Chinese.
  • The Map Room Blog links to an exhibit on persuasive cartography.
  • The NYRB Daily shares photos of 19th century Rio de Janeiro.
  • Out of Ambit’s Diane Duane shares a recipe for gingerbread.
  • Mark Simpson engages with spornosexuality.
  • Towleroad notes the ill-thought article outing gay Olympic atheltes.
  • The Volokh Conspiracy notes the non-recognition of special sharia rules in American courts for Muslims in family law.
  • Window on Eurasia notes Russia’s problematic military economy, looks at the Russian immigrant community in China, notes the pro-Baltic patriotism of Russophones, and looks at prospects for rapid population fall in Russia.

[BLOG] Some Wednesday links

  • blogTO notes that craft brewers would like to open their own retail stores in Toronto.
  • Centauri Dreams and The Dragon’s Tales both note that we now have the ability to detect starships travelling at very high fractions of the speed of light.
  • The Dragon’s Gaze links to a paper further refining the HR 8799 system.
  • The Dragon’s Tales notes Egypt’s plan to build a new capital city.
  • The Frailest Thing comments on the philosophical problems associated with the goal of extending life expectancy.
  • Joe. My. God. and Towleroad both note the failure of a Russian bid to prevent the United Nations’ offering of benefits to its married gay staffers.
  • Language Hat notes a Sanskrit humour column.
  • Marginal Revolution links to a study examining the changing nature of the language of World Bank reports.
  • Peter Rukavina notes that on some days, wind power is enough to supply all of Prince Edward Island’s electricity needs.
  • Spacing Toronto continues an ongoing examination of visual pollution.
  • Window on Eurasia notes a Russian interest, pre-Crimea, in emigration.

[BLOG] Some Tuesday links

  • blogTO notes that loads of new streetcars should arrive this year for the TTC.
  • The Dragon’s Gaze links to one paper examining the impact of colliding stellar winds in a close binary on habitable planets, links to another examining how habitable planets gets their water, and wonders about the insights provided by the HR 8799 planetary system into water delivery.
  • The Dragon’s Tales links to a paper arguing that Enceladus’ subsurface ocean is made of alkaline soda water.
  • Joe. My. God. notes a claim by some British scientists that it may be possible, with foreseeable genetic engineering, to create children with two same-sex parents.
  • Languages of the World’s Asya Perelstvaig looks into what Broca’s area of the brain actually means for human language.
  • Marginal Revolution notes that the woman-dominated area of health care is a growth area for middle-class employment in the United States.
  • Otto Pohl notes that yesterday was the 71st anniversary of the deportation of the Chechens and the Ingush.
  • pollotenchegg maps industrial production in Ukraine.
  • Will Baird argues at The Power and the Money that the Minsk Accord is crumbling and examines the reasons for Chinese support of Russia.
  • Spacing Toronto’s John Lorinc worries about corporate sponsorship of ice rinks.
  • Torontoist notes that Massey Hall has begun its renovations.
  • Towleroad notes a Texan legislator who wants to make it illegal for trans people to use public washrooms.
  • Transit Toronto observes that the Union-Pearson Express is undergoing test runs.
  • Window on Eurasia worries about the potential for a minority of Russians in Latvia’s eastern Latgale province to start trouble.

[BLOG] Some Tuesday links

  • The Boston Globe‘s The Big Picture shares photos of the Paris anti-terrorist rallies.
  • blogTO shares five books put out by Toronto-area artists.
  • Crooked Timber’s Corey Robin notes the international ideological tumult around the American civil war.
  • D-Brief talks about some neat facts about Eta Carinae.
  • The Dragon’s Gaze reports on a recent study of the HR 8799 planetary system.
  • The Dragon’s Tales reports on the Chinese Chang’e probe’s observations of nearby Earth-crossing asteroid Toutatis.
  • Joe. My. God. notes how a Hasidic paper photoshopped out images of female world leaders.
  • Languages of the World looks at the influences of Novgorod’s dialect and Old Church Slavonic on Russian.
  • Livejournaler pollotenchegg looks at ethnicity and politics in Soviet Ukraine and Belarus.
  • Savage Minds provides organizational advice for ethnographers who are writing large projects.
  • Window on Eurasia notes Kaliningrad separatism, wonders about the loyalties of Central Asian volunteers in the Russian military, and fears for the future of Russia under its cynical leadership.

[LINK] “First Reconnaissance Of An Exoplanetary System”

HR 8799, a star 49% more massive than our sun and nearly five times as bright, roughly 129 light years away, stands out for a few reasons. For starters, it’s only 30 million years old. More interestingly, as I noted in December 2010, it is known to host four gas giant planets, young massive worlds that are still so hot that their radiated heat lets them be directly detected by telescopic observations. Scientific American‘s Caleb Scharf notes at his blog that the four gas giants of HR 8799 are now the first planets with atmospheres possessing spectra that have been directly imaged. We know what their atmospheres are made of.

There are signatures of compounds like methane and ammonia, but also of things that might be acetylene and hydrogen cyanide – it’s a real mix. To quote Oppenheimer et al. – their analyses suggest that the planets are like this:

• b: contains ammonia and/or acetylene as well as CO2 but little methane.

• c: contains ammonia, perhaps some acetylene but neither CO2 nor substantial methane.

• d: contains acetylene, methane and CO2 but ammonia is not definitively detected.

• e: contains methane and acetylene but no ammonia or CO2.

You might be glazing over with this, so what does it mean? First, it means that these objects look more like planets than they do brown dwarfs. They’re also clearly, and remarkably, distinct from each other – despite (presumably) all being big, hot, gas giants. The only one that looks vaguely familiar is ‘e’ – whose spectrum is a bit like that of the night-side of Saturn.

Exactly how and why these worlds are so varied is a juicy puzzle. The researchers suggest that it might in part be a result of ultra-violet light flooding the system in bursts from the youthful star HR 8799. A thousand times brighter than the equivalent from our Sun, this radiation can drive all sorts of chemical and physical changes in planetary atmospheres.

The process is described by a paper by astronomer Ben Oppenheimer and colleagues.

Written by Randy McDonald

March 13, 2013 at 2:46 am