AAS NOVA — Research Highlights 2020

Find out the latest thinking about our universe.
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Eccentricity, Spin, and the Origins of Colliding Black Holes

Post by bystander » Wed Jan 27, 2021 6:07 pm

Eccentricity, Spin, and the Origins of Colliding Black Holes
NOVA | American Astronomical Society | 2020 Nov 06
Susanna Kohler wrote:
The tally of merging black holes detected by the LIGO-Virgo gravitational-wave detectors continues to grow; the most recent data release brings the total to nearly 50 collisions! But how do these black-hole binaries form in the first place? ...

GW190521: Orbital Eccentricity and Signatures of Dynamical Formation
in a Binary Black Hole Merger Signal
~ Isobel M. Romero-Shaw et al
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Seeing Cepheids in the X-Ray

Post by bystander » Wed Jan 27, 2021 6:14 pm

Seeing Cepheids in the X-Ray
NOVA | American Astronomical Society | 2020 Nov 11
Tarini Konchady wrote:
Cepheids are pulsating variable stars, meaning that their periodic changes in brightness are associated with changes in physical size. The wavelengths at which Cepheids emit radiation also vary as the stars pulsate. So what’s happening in the X-ray when it comes to Cepheids? ...

Phase-modulated X-Ray Emission from Cepheids due to Pulsation-Driven Shocks ~ Sofia-Paraskevi Moschou et al
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Climate Stabilization on Distant Worlds

Post by bystander » Wed Jan 27, 2021 7:00 pm

Climate Stabilization on Distant Worlds
NOVA | American Astronomical Society | 2020 Nov 13
Susanna Kohler wrote:
A critical component of a habitable planet is its ability to stabilize its climate over long timescales. In a new study, scientists explore whether a world covered in water can keep its climate as stable as an Earth-like, continental world. ...

Waterworlds May Have Better Climate Buffering Capacities than
Their Continental Counterparts
~ Benjamin P. C. Hayworth, Bradford J. Foley
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ASKAP Finds a Real-Time Radio Burst, but No Glow

Post by bystander » Wed Jan 27, 2021 7:09 pm

ASKAP Finds a Real-Time Radio Burst, but No Glow
NOVA | American Astronomical Society | 2020 Nov 16
Susanna Kohler wrote:
As powerful millisecond bursts of radio emission continue to light up our detectors from across the universe, the hunt for the origins of these fast radio bursts continues. It’s the search for light before and after the burst, however, that might prove key to unraveling their mystery. ...

Limits on Precursor and Afterglow Radio Emission from a Fast Radio Burst in a Star-forming Galaxy ~ Shivani Bhandari et al
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Making Waves on the Sun

Post by bystander » Wed Jan 27, 2021 7:15 pm

Making Waves on the Sun
NOVA | American Astronomical Society | 2020 Nov 18
wrote:
Sinuous, undulating waves in the Earth’s atmosphere play a large role in driving the weather patterns on our planet. A new study now describes how similar motion can govern the behavior of the Sun — and what we stand to learn from it. ...

Physics of Magnetohydrodynamic Rossby Waves in the Sun ~ Mausumi Dikpati et al
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A Terrestrial-Mass Planet on the Run?

Post by bystander » Wed Jan 27, 2021 11:13 pm

A Terrestrial-Mass Planet on the Run?
NOVA | American Astronomical Society | 2020 Nov 20
Susanna Kohler wrote:
Scientists have long believed that there may be billions to trillions of rogue planets drifting through our galaxy, unattached to any host star. A recent study has now identified one such candidate — potentially the first terrestrial-mass world we’ve spotted on the run. ...

A Terrestrial-Mass Rogue Planet Candidate Detected in the Shortest-Timescale Microlensing Event ~ Przemek Mróz et al
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The Eventual Fate of Our Solar System

Post by bystander » Sat Jan 30, 2021 6:36 pm

The Eventual Fate of Our Solar System
NOVA | American Astronomical Society | 2020 Nov 25
Susanna Kohler wrote:
What thoughts keep you awake at night? If it’s questions about how our solar system is going to end … wow, you really focus on the big picture! But some scientists have wondered the same thing, and they’ve got an answer for you: part of it will be swallowed, and the rest is probably going to disintegrate. ...

The Great Inequality and the Dynamical Disintegration of the Outer Solar System ~ Jon K. Zink, Konstantin Batygin, Fred C. Adams
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A Companion for Regulus

Post by bystander » Sat Jan 30, 2021 6:42 pm

A Companion for Regulus
NOVA | American Astronomical Society | 2020 Nov 30
Susanna Kohler wrote:
The nearby star Regulus — the heart of the constellation Leo — has long been known to be in a binary. But though the bright, main-sequence star is easy to spot, we’ve yet to detect Regulus’s companion! A recent study now presents what may be a first look at this mysterious object. ...
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Letting Lithium Live It Up

Post by bystander » Sat Jan 30, 2021 6:49 pm

Letting Lithium Live It Up
NOVA | American Astronomical Society | 2020 Dec 04
Tarini Konchady wrote:
As stars evolve from the red giant branch to the red clump, they accumulate lithium on their surfaces. How does this accumulation happen? ...

A Helium-Flash-Induced Mixing Event Can Explain the Lithium Abundances of Red Clump Stars ~ Josiah Schwab
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Nugget Galaxies Cross in the Sky

Post by bystander » Sat Jan 30, 2021 6:56 pm

Nugget Galaxies Cross in the Sky
NOVA | American Astronomical Society | 2020 Dec 09
Susanna Kohler wrote:
Seeing quadruple? In a rare phenomenon, some distant objects can appear as four copies arranged in an “Einstein cross”. A new study has found two more of these unusual sights — with an unexpected twist. ...

Discovery of Two Einstein Crosses from Massive Post-blue Nugget Galaxies at z > 1 in KiDS ~ N.R. Napolitano et al
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A Radio Flare from Colliding Stars?

Post by bystander » Sat Jan 30, 2021 7:03 pm

A Radio Flare from Colliding Stars?
NOVA | American Astronomical Society | 2020 Dec 11
Susanna Kohler wrote:
When a pair of neutron stars collide, they emit a fireworks show. Could some of the low-energy light produced in these mergers be detectable years later? A team of scientists thinks so — and they’re pretty sure they’ve found an example. ...

FIRST J1419+3940 as the First Observed Radio Flare from a Neutron Star Merger ~ K.H. Lee et al
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Diving Into an Atmosphere in Ultraviolet

Post by bystander » Sat Jan 30, 2021 7:13 pm

Diving Into an Atmosphere in Ultraviolet
NOVA | American Astronomical Society | 2020 Dec 14
Susanna Kohler wrote:
What’s going on around the hot Jupiter exoplanet HAT-P-41b? This planet’s atmosphere is harboring a mystery, recently revealed by observations that span infrared through ultraviolet (UV) light. ...

Into the UV: The Atmosphere of the Hot Jupiter HAT-P-41b Revealed ~ N. K. Lewis et al
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Can Computers Identify Holes in the Sun?

Post by bystander » Sat Jan 30, 2021 7:21 pm

Can Computers Identify Holes in the Sun?
NOVA | American Astronomical Society | 2020 Dec 16
Susanna Kohler wrote:
Want to be able to predict the flurries of high-energy particles that slam into Earth from the Sun, triggering dramatic geomagnetic storms? Then you’ll first need to track the holes in the Sun’s outer atmosphere. In a new study, scientists explore whether we can train computers to identify these patterns. ...

Machine-learning Approach to Identification of Coronal Holes
in Solar Disk Images and Synoptic Maps
~ Egor Illarionov, Alexander Kosovichev, Andrey Tlatov
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Tying Stars and Galaxies Together

Post by bystander » Sat Jan 30, 2021 7:28 pm

Tying Stars and Galaxies Together
NOVA | American Astronomical Society | 2020 Dec 18
Tarini Konchady wrote:
A galaxy’s stars hold clues to its history. So, if we look at the stellar populations of several galaxies along with the properties of the galaxies themselves, we may be able to tease out trends in galaxy evolution. ...

Gravitational Potential and Surface Density Drive Stellar Populations.
II. Star-forming Galaxies
~ Tania M. Barone et al
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