AAS NOVA — Research Highlights 2020

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AAS NOVA — Research Highlights 2020

Post by bystander » Fri Jan 17, 2020 6:13 pm

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Giant Planets in a Post-Apocalyptic Solar System

Post by bystander » Thu Jan 23, 2020 3:48 pm

Giant Planets in a Post-Apocalyptic Solar System
NOVA | American Astronomical Society | 2020 Jan 22
Susanna Kohler wrote:
It’s nearly eight billion years in the future.

The Sun, having exhausted its source of fuel, has dramatically expanded into a red giant and then puffed off its outer layers, leaving its dense, scalding hot core exposed. This core — a white dwarf — initially clocks in at nearly 100,000 K (180,000 °F), bathing its surroundings in harsh extreme-ultraviolet (EUV) radiation at levels that are up to a million times brighter than the present-day Sun.

Earth and the other inner, rocky planets were swallowed up by the ballooning Sun long ago. But how have the giant planets of our solar system — Jupiter, Saturn, Uranus, and Neptune — fared since this unavoidable apocalypse? ...

Cold Giant Planets Evaporated by Hot White Dwarfs ~ Matthias R. Schreiber et al
viewtopic.php?t=40068
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Re: Giant Planets in a Post-Apocalyptic Solar System

Post by saturno2 » Fri Jan 24, 2020 2:07 pm

bystander wrote:
Thu Jan 23, 2020 3:48 pm
Giant Planets in a Post-Apocalyptic Solar System
NOVA | American Astronomical Society | 2020 Jan 22
Susanna Kohler wrote:
It’s nearly eight billion years in the future.

The Sun, having exhausted its source of fuel, has dramatically expanded into a red giant and then puffed off its outer layers, leaving its dense, scalding hot core exposed. This core — a white dwarf — initially clocks in at nearly 100,000 K (180,000 °F), bathing its surroundings in harsh extreme-ultraviolet (EUV) radiation at levels that are up to a million times brighter than the present-day Sun.

Earth and the other inner, rocky planets were swallowed up by the ballooning Sun long ago. But how have the giant planets of our solar system — Jupiter, Saturn, Uranus, and Neptune — fared since this unavoidable apocalypse? ...

Sad end to planet Earth and the life

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Confirming New Physics in Space

Post by bystander » Mon Jan 27, 2020 7:21 pm

Confirming New Physics in Space
NOVA | American Astronomical Society | 2020 Jan 24
Susanna Kohler wrote:
Not all laboratory astrophysics occurs in labs down here on Earth; sometimes, the lab is in space! A new study has used a space laboratory to confirm a new atomic process — with far-reaching implications. ...

First Evidence of Enhanced Recombination in Astrophysical
Environments and the Implications for Plasma Diagnostics
~ A. Nemer et al
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Faint Repetitions of an Extragalactic Burst

Post by bystander » Fri Jan 31, 2020 6:19 pm

Faint Repetitions of an Extragalactic Burst
NOVA | American Astronomical Society | 2020 Jan 29
Susanna Kohler wrote:
New evidence deepens the mystery of fast radio bursts (FRBs), the brief flashes of radio emission stemming from unknown sources beyond our galaxy. Scientists have now discovered faint repeat bursts from one of the brightest FRBs, previously thought to have been a one-off event. ...

Faint Repetitions from a Bright Fast Radio Burst Source ~ Pravir Kumar et al
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Today’s Forecast for K2-18b: Cloudy with a Chance of Rain?

Post by bystander » Fri Jan 31, 2020 6:57 pm

Today’s Forecast for K2-18b: Cloudy with a Chance of Rain?
NOVA | American Astronomical Society | 2020 Jan 31
Tarini Konchady wrote:
Water is critical to life as we know it on Earth. So naturally, finding evidence of liquid water on a planet in its star’s habitable zone is extremely relevant to searches for extraterrestrial life. Thus far, we’ve only discovered water vapor in the atmospheres of massive, short-period gas giants — but new observations of sub-Neptune K2-18b have now changed that. ...

Water Vapor and Clouds on the Habitable-zone Sub-Neptune Exoplanet K2-18b ~ Björn Benneke et al viewtopic.php?t=39785
viewtopic.php?t=37820
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Comparing Black Holes Large and Small

Post by bystander » Wed Feb 05, 2020 6:14 pm

Comparing Black Holes Large and Small
NOVA | American Astronomical Society | 2020 Feb 03
Susanna Kohler wrote:
Black holes come in a variety of sizes — from a mass of a few Suns, to millions or even billions of solar masses. As these vastly different black holes feast on accreting matter, do they behave in the same way? ...

The Analogous Structure of Accretion Flows in Supermassive and Stellar Mass
Black Holes: New Insights from Faded Changing-look Quasars
~ John J. Ruan et al
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A Detailed View of Our Second Interstellar Visitor

Post by bystander » Wed Feb 12, 2020 6:08 pm

A Detailed View of Our Second Interstellar Visitor
NOVA | American Astronomical Society | 2020 Feb 05
Susanna Kohler wrote:
What do we know about the second object to visit us from another stellar system? Detailed Hubble images have given us plenty to consider! ...

The Nucleus of Interstellar Comet 2I/Borisov ~ David Jewitt et al
viewtopic.php?t=39796#p297892
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Early Results from Parker Solar Probe

Post by bystander » Wed Feb 12, 2020 6:20 pm

Early Results from Parker Solar Probe
NOVA | American Astronomical Society | 2020 Feb 07
Susanna Kohler wrote:
What might we learn about the Sun if we could fly a spacecraft close enough to dip down and skim through its atmosphere? Thanks to the Parker Solar Probe, we don’t have to speculate! ...

Early Results from Parker Solar Probe: Ushering a New Frontier in Space Exploration ~ Nour E. Raouafi et al
  • Astrophysical Journal Supplement Series 246(2) (2020 Feb)

viewtopic.php?t=38586
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A Pulsed Discovery in Omega Centauri

Post by bystander » Wed Feb 19, 2020 3:55 pm

A Pulsed Discovery in Omega Centauri
NOVA | American Astronomical Society | 2020 Feb 12
Susanna Kohler wrote:
The globular cluster Omega Centauri makes for an impressive sight — millions of stars gravitationally bound into a beautiful sphere, its core alight from the glow of densely packed bodies. A recent study has unveiled a new discovery at the heart of this cluster: five long-anticipated pulsars. ...

Discovery of Millisecond Pulsars in the Globular Cluster Omega Centauri ~ Shi Dai et al
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Making Stars at the Beginning of the Universe

Post by bystander » Wed Feb 19, 2020 4:01 pm

Making Stars at the Beginning of the Universe
NOVA | American Astronomical Society | 2020 Feb 14
Tarini Konchady wrote:
Studying star formation in the early universe can give us clues about what the universe was like when the earliest massive galaxies were forming. How efficiently were these first galaxies making stars only a billion years after the Big Bang? ...

Low Star Formation Efficiency in Typical Galaxies at z = 5–6 ~ Riccardo Pavesi et al
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ALMA Explores Possible Interacting Twin Disks

Post by bystander » Wed Feb 19, 2020 4:10 pm

ALMA Explores Possible Interacting Twin Disks
NOVA | American Astronomical Society | 2020 Feb 17
Susanna Kohler wrote:
Some young stars seem to spend a brief portion of their lives undergoing dramatic, flaring outbursts. A new study has used the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to get the closest look yet at one of these systems — possibly identifying the cause of the flares. ...

Resolving the FU Orionis System with ALMA: Interacting Twin Disks? ~ Sebastián Pérez et al
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